Stihl Ms150c Service Manual – PDF Download

STIH)

STIHL MS 150 C, MS 150 TC

2012-04

Contents

1.

1.1 1.2

Introduction and safety precautions Introduction Safety precautions

6.

Engine

28

6.1 6.2 6.2.1 6.2.2

28 28 29

6.7 6.8

Muffler Leak testing Preparations Testing with negative pressure Pressure test Oil seals Ignition side Clutch side Engine Cylinder Crankshaft / crankcase Ball bearing / crankcase Piston Piston ring

7.

Ignition system

42

3 4

2.

Specifications

5

2.1 2.2 2.3 2.4 2.5

Engine Fuel system Ignition system Chain lubrication Tightening torques

5 5 5 5 6

7.1 7.2 7.3

Ignition timing Ignition module Testing with STIHL MDG 1 Preparations Testing the ignition module Spark plug boot / ignition lead Flywheel Short circuit wire Testing Removal and installation Ground wire Contact spring Troubleshooting, ignition system

42 42

6.2.3 6.3 6.3.1 6.3.2 6.4 6.5 6.6 6.6.1

3.

Troubleshooting

8

3.1 3.2

Clutch Chain Drive, Chain Brake, Chain Tensioner Chain lubrication Starter Ignition system Carburetor Engine

8

3.3 3.4 3.5 3.6 3.7

9 10 11 13 14 18

7.3.1 7.4 4.

Clutch

19 7.5

4.1 4.2

Clutch Clutch drum

19 20

5.

Chain brake

22

5.1

Checking operation of chain brake Brake band Brake lever Leaf spring Pins Chain tensioner Chain catcher Bar mounting stud

5.2 5.3 5.4 5.5 5.6 5.6.1 5.7

22 22 23 25 25 26 27 27

7.6 7.7 7.7.1 7.7.2 7.8 7.9 7.10

30 30 31 31 31 32 33 35 38 39 41

9.1 9.2 9.3 9.4 9.4.1 9.4.2 9.5

10.

Antivibration elements Rubber buffers Handlebar / antivibration springs Antivibration spring of handle housing / engine housing Stop buffer of handle housing / engine housing Stop buffer Limit stop Anchor loop (MS 150 TC) Actuating levers

50

10.1 Master Control lever 10.1.1 Switch shaft MS 150 C 10.1.2 Switch shaft MS 150 TC 10.1.3 Double lever MS 150 TC 10.2 Throttle trigger / trigger interlock MS 150 C 10.3 Throttle trigger / trigger interlock MS 150 TC 10.3.1 Throttle rod MS 150 C 10.3.2 Throttle rod MS 150 TC 10.4 Handle housing MS 150 C 10.5 Handle housing MS 150 TC

43 43 44 45 45 46 46 47 48 48

59 59 59 60 61 61 61 62 63 63 63 64 64 65 66 67 68 69 72

8.

Starter

53

11.

Chain lubrication

75

8.1 8.2 8.3 8.4 8.5

General Fan housing Pawls Rope rotor Starter rope / starter grip Tensioning the rewind spring Replacing the rewind spring Starter rope guide bushing

53 53 53 54

11.1 11.2 11.3

Pickup body Oil suction hose Cast arm for oil pressure Oil pump Valve

75 75

8.6 8.7 RA_560_00_01_01

9.

3

8.8

55

11.4 11.5

75 76 77

56 56 57

q Š ANDREAS STIHL AG & Co. KG, 2012

MS 150 C, MS 150 TC

1

Contents

12.

Fuel system

78

12.1 12.2 12.3 12.4 12.4.1 12.5

78 78 79 79 81

12.6.1 12.6.2 12.7 12.8 12.9 12.9.1 12.9.2 12.10 12.10.1 12.10.2

Air filter Baffle Filter base Carburetor Leakage test Repairing the carburetor Metering diaphragm Inlet needle Pump diaphragm Adjusting screws Carburetor adjustment Basic setting Standard setting Intake elbow Impulse hose Tank vent Testing Tank vent Fuel intake Pickup body Fuel hoses

86 86 87 88 89 89 89 90 91 91 92

13.

Special tools

93

14.

Service accessories 95

12.5.1 12.5.2 12.5.3 12.5.4 12.6

2

82 82 82 83 84

MS 150 C, MS 150 TC

1.

Introduction and safety precautions

1.1

Introduction

Refer to the latest edition of the relevant spare parts list to check the part numbers of any spare parts required.

A fault on the machine may be due to several causes. To help locate the fault, consult the chapter on "Troubleshooting" and the "STIHL Service Training System" for all functional groups.

Refer to the "Technical Information" bulletins for engineering changes which have been introduced since publication of this Service Manual.

Technical information bulletins also supplement the spare parts list and Service Manual until an updated edition is issued.

The special tools mentioned in the descriptions are listed in the chapter "Special Servicing Tools" of this manual. The tools can be identified according to part number in the "STIHL Special Tools" manual. The manual lists all tools supplied by STIHL. Symbols are included in the text and pictures for greater clarity.

The meanings are as follows:

MS 150 C, MS 150 TC

: Action to be taken as shown in the illustration (above the text)

Before repair tasks, always remove the chain sprocket cover, saw chain, guide bar and clutch drum – Chain brake must be released.

– Action to be taken that is not shown in the illustration (above the text)

For repair work, clamp the machine on the assembly stand.

In the illustrations: A

Item pointer (short)

a Direction of movement (long arrow) @ 4.2 Reference to another chapter, in this case to Chapter 4.2 "Service Manuals" and "Technical information bulletins" are intended exclusively for the use of properly equipped repair shops. They must not be passed on to third parties.

1 3 2

Servicing and repairs are made considerably easier if the machine is mounted on assembly stand (3) 5910 890 3101. For this purpose, secure the clamp (2) 5910 850 1650 to the assembly stand with two screws (1).

The screws must not protrude, as they may damage the housings when clamping the machine, depending on the machine.

2011RA061 AM

Refer to the illustrated spare parts lists during all repair work. These lists show the installation position and order in which the individual parts and modules should be assembled.

Preparing to make repairs

2710RA320 TG

This Service Manual contains detailed descriptions of all the typical repair and servicing procedures for this machine.

In the text:

The machine is guided with the collar screw through the upper hole of the clamping rail and fastened using nut M 8 (arrow).

The machine is fastened to the mount on the clamping rail by the screw head on the crankcase.

Always use original STIHL replacement parts.

They can be identified by the STIHL part number, the logo { and the STIHL parts symbol K. The symbol may appear alone on small parts.

Storage or disposal of oil and fuel Collect fuel or lubricating oil in a clean container and dispose of it in accordance with environmental regulations.

3

1.2

Safety precautions

Specific national safety regulations and the safety instructions in the instruction manual must be observed if the machine has to be started up during maintenance or repair work.

Fuel is highly inflammable and can also be explosive under certain conditions.

Do not bring any fire, flame, spark or other source of heat near the fuel.

All work with fuel must be performed outdoors only. Spilled fuel must be wiped away immediately.

Test for leakage after all work on the fuel system and engine.

Exercise extreme caution while carrying out maintenance and repair work on the ignition system. The high voltages which occur can cause serious or fatal accidents.

Suitable gloves must be worn without fail if parts are heated for assembly/disassembly purposes.

Improper handling may result in burns and other serious injuries.

Always replace damaged parts.

Check dismantled parts for wear and damage before installation, replace if necessary.

The chapter "Tightening Torques" lists all components of this machine that must be tightened with the specified tightening torques or coated with thread-locking adhesive. These specifications must be observed throughout the Service Manual when tightening screws and nuts as well as other fasteners.

Fuel system – barbed connectors Pull or push the fuel hoses, by hand whenever possible, in the direction of the connector in order to ensure leakproofness of the fuel system.

Avoid damaging the barbed connectors – sharp-edged pliers, screwdrivers, etc., may not be used.

Also, do not cut open fuel hoses with a knife or similar aids.

Do not reuse fuel hoses after disassembly, but instead always replace them with new hoses – fuel hoses can be overstretched when being detached.

Mount new fuel hoses dry or using STIHL press fluid – apply press fluid to the ends of the hose and the connectors, b 14.

Other press fluids are not permitted and may lead to fuel hose damage.

Only use the machine with the fan housing mounted – otherwise the rotating flywheel poses a risk of injury and there is a risk of engine damage due to overheating.

4

MS 150 C, MS 150 TC

2.

Specifications

2.1

Engine

Displacement: Cylinder bore: Stroke: Engine power according to ISO 7293: Cut-off speed (with bar and chain): Idle speed: Clutch: Clutch engages at: Crankcase leakage test under vacuum: at gauge pressure:

2.2

23.6 cm3 34.0 mm 26.0 mm 1 kW (1.4 HP) at 10000 rpm

23.6 cm3 34.0 mm 26.0 mm 1 kW (1.4 HP) at 10000 rpm

12800 rpm 3000 rpm Centrifugal clutch without linings 5300 rpm

12800 rpm 3000 rpm Centrifugal clutch without linings 5300 rpm

pu = 0.5 bar pü = 0.5 bar

pu = 0.5 bar pü = 0.5 bar

pü = 0.8 bar pü = 0.5 bar as specified in instruction manual

pü = 0.8 bar pü = 0.5 bar as specified in instruction manual

0,30 (+ 0.05/- 0.10) mm NGK CMR 6 H 0.5 mm

0,30 (+ 0.05/- 0.10) mm NGK CMR 6 H 0.5 mm

Ignition system

Air gap between ignition module and flywheel: Spark plug (suppressed): Electrode gap:

2.4

MS 150 TC

Fuel system

Carburetor leakage test at gauge pressure: Operation of tank vent at gauge pressure: Fuel:

2.3

MS 150 C

Chain lubrication

Fully automatic, speed-controlled oil pump with rotary piston (Ematic) Oil delivery rate:

MS 150 C, MS 150 TC

8,0 (+/- 2.0) cm3/min at 10000 rpm

8,0 (+/- 2.0) cm3/min at 10000 rpm

5

2.5

Tightening torques

DG and P screws are fitted in plastic and light alloy metal parts. These screws form a permanent thread when they are installed for the first time. The material is permanently deformed. Screws can be removed and installed as often as necessary without impairing the strength of the screwed assembly, provided that the specified tightening torque is observed. Reuse aluminum screws a maximum of 3 times. When tightened several times, the plastic on the screws becomes deformed and the strength is reduced.

For this reason it is essential to use a torque wrench.

Fastener

Thread size

For component

Tightening torques Nm

Screw Screw

P 4x16 P 5x20

2.0 4.0

Stud Stud

D 8x18 D 9x18

Screw

P 4x16

Screw Screw Screw Screw

P 4x10 P 6x19 P 5x20 P 4x16

Screw Screw Screw Screw Screw Screw Screw Screw Screw Screw Screw Screw Carrier Screw Screw Screw Screw Screw

P 6.3x18 P 5x16 D 4x12 M 5x25 M 5x25 M 5x20 P 4x16 P 4x16 P 4x16 P 5x25 P 4x16 P 4x10 M 8x1 D 5x26 P 4x16 D 5x26 D 4x16 P 5x29.6

Chain tensioner cover / engine housing Stop / engine housing (MS 150 C only) Bar mounting stud Bar mounting stud / engine housing (repair solution) Cover (oil pump) / bearing plug / engine housing Cover / chain sprocket cover Handle housing / front handle (MS 150 C) Handle housing / front handle (MS 150 TC) Handle molding / handle housing (MS 150 TC only) Chain catcher Spiked bumper / engine housing Manifold / cylinder Crankcase / crankcase 1st stage Crankcase / crankcase 2nd stage Crankcase / cylinder Bearing plug / handle housing (MS 150 C) Bearing plug / handle housing (MS 150 TC) Bearing plug / engine housing Fan housing / carrier Fan housing / engine housing Fan housing / return spring Carrier / crankshaft Engine housing / crankcase Engine housing / annular buffers Engine housing / cylinder / annular buffers Oil pump / crankcase Annular buffer / handle housing

6

Comment

9.0 12.0 2.0 1.2 4.0 4.0 1.2 3.0 4.0 4.0 fit 2.5 8.0 2.0 1.2 2.0 3.0 2.0 2.0 15.0 7.0 2.0 7.0 4.5 3.0

1) 2) 3) 5) 1) 2)

2) 2) 2) 1) 2)

MS 150 C, MS 150 TC

Fastener

Thread size

For component

Tightening torque Nm

Comment

Screw Nut Screw Screw

M 5x12 M6 M 5x44 M 5x44 M 10x1 D 4x20

Muffler / cylinder Flywheel / crankshaft Carburetor screws, 1st stage Carburetor screws, 2nd stage Spark plug Ignition module / cylinder

8.0 12.0 fit 2.0 12.0 4.0

1) 2)

Screw

3) 4) 5) 1) 2)

Remarks: 1) Screws with locking serration 2) Screws with easy-slide coating, must be replaced after each disassembly 3) Aluminum screws, after tightening with tightening torque, tighten by another 1/4 turn 4) Screws waxed bright 5) Reuse aluminum screws a maximum of 3 times

When inserting DG and P screws into an existing screw thread: Insert the DG or P screw in the hole and turn counterclockwise until it gently drops into the hole in axial direction.

Tighten the screw clockwise to the specified torque.

This procedure ensures that the screw engages properly in the existing thread and does not form a new thread and weaken the assembly.

Screwdriver speed when used in plastic material: DG and P screws max. 500 rpm.

Do not use an impact wrench to release or tighten screw connections.

Screws with and without locking serration must not be confused.

MS 150 C, MS 150 TC

7

3.

Troubleshooting

3.1

Clutch

Problem

Cause

Remedy

Saw chain becomes stuck under full load

Clutch shoes badly worn

Replace clutch

Clutch drum badly worn

Replace clutch drum

Idle speed too high

Readjust idle speed screw LA

Tension springs of the clutch shoes are stretched

Replace clutch springs or replace clutch

Tension springs of the clutch shoes are broken

Replace clutch springs

Tension springs stretched

Replace all clutch springs

Clutch shoe retainer broken

Replace retainer or clutch

Clutch shoes and carrier worn

Replace clutch

Needle cage damaged

Replace needle cage

Saw chain rotates at idle speed

Loud noises

8

MS 150 C, MS 150 TC

3.2

Chain Drive, Chain Brake, Chain Tensioner

Problem

Cause

Remedy

Chain sprocket wears rapidly

Chain not properly tensioned

Tension chain as specified

Wrong chain pitch

Fit chain of correct pitch

Insufficient chain lubrication

Check chain lubrication

Clutch shoes badly worn

Replace chain sprocket

Clutch drum badly worn

Replace clutch drum

Brake band stuck

Check freedom of movement and function of brake band

Idle speed too high

Readjust idle speed screw LA

Tension springs of the clutch shoes are stretched

Replace clutch springs or replace clutch

Tension springs of the clutch shoes are broken

Replace clutch springs

Brake spring stretched or broken

Replace brake spring

Brake band stretched, worn or broken

Replace brake band

Clutch drum worn

Replace chain sprocket

Saw chain becomes stuck under full load

Saw chain rotates at idle speed

Saw chain does not stop immediately when brake is activated

MS 150 C, MS 150 TC

9

3.3

Chain lubrication

In the event of trouble with the chain lubrication system, check and rectify other sources of faults before disassembling the oil pump.

.

Problem

Cause

Chain receives no oil

Oil inlet hole in guide bar is blocked Clean oil inlet hole

Machine looses chain oil

Oil pump delivers insufficient oil

10

Remedy

Intake hose or pickup body clogged or intake hose ruptured

Replace intake hose and pickup body

Cast arm clogged or cracked

Clean cast arm, replace if necessary

Valve in oil tank blocked

Clean or replace valve

Worm worn

Replace worm

Oil pump damaged or worn

Replace oil pump

Oil pump damaged or worn

Replace oil pump

Oil intake hose connection damaged

Replace oil intake hose

Crankcase cracked

Replace crankcase

Oil pump damaged or worn

Replace oil pump

Worm worn

Replace worm

MS 150 C, MS 150 TC

3.4

Starter

Problem

Cause

Remedy

Starter rope broken

Rope pulled out too vigorously as far as stop or over edge, i.e. not vertically

Replace starter rope

Normal wear

Replace starter rope

Heavy fouling or rust on rewind spring

Clean or replace rewind spring

Rewind spring insufficiently tensioned

Check rewind spring and increase tension

Rewind spring broken

Replace rewind spring

Starter rope cannot be pulled out far enough

Rewind spring overtensioned

Check rewind spring and reduce tension

Starter rope can be pulled out almost without resistance (crankshaft does not turn)

Spring is fatigued

Replace spring

Spring not installed properly

Install spring correctly

Pawls worn

Replace pawls

Torsion springs in pawls broken

Replace torsion springs

Torsion spring in pawl installed with no tension

Install torsion spring in pawl correctly

Spring (ErgoStart) broken

Replace spring, check carrier and rope rotor, replace if necessary

Starter rope does not rewind

MS 150 C, MS 150 TC

11

Problem

Cause

Remedy

Starter rope is difficult to pull or rewinds very slowly

Starter mechanism is very dirty

Thoroughly clean complete starter mechanism

At very low outside temperatures: Lubricant oil on the rewind spring becomes viscous (spring winding stick together) or moisture has penetrated the rewind spring (spring windings are frozen)

Coat rewind spring with a little standard solvent-based degreasant (containing no chlorinated or halogenated hydrocarbons), then pull rope carefully several times until normal action is restored

12

MS 150 C, MS 150 TC

3.5

Ignition system

Problem

Cause

Remedy

Engine runs roughly, misfires, temporary loss of power

Spark plug boot is loose

Press boot firmly onto spark plug and fit new spring if necessary

Spark plug sooted, smeared with oil Clean spark plug, replace if necessary. In the event of repeated sooting, check air filter.

MS 150 C, MS 150 TC

Fuel / oil mixture – contains too much oil

Use a fuel mixture with the correct mixing ratio

Incorrect air gap between ignition module and flywheel

Set the correct air gap

Flywheel is cracked or has other damage or pole shoes have turned blue

Install new flywheel

Incorrect ignition timing, flywheel out of adjustment – Guide rib in flywheel has sheared off

Install new flywheel

Weak magnetization in flywheel

Install new flywheel

Irregular spark

Check operation of switch shaft / contact spring or contact springs and ignition module Check ignition lead or short circuit wire for damaged insulation or interruption.

Check ignition lead / ignition module, replace ignition module if necessary. Check operation of spark plug, clean spark plug and replace if necessary.

Crankcase damaged (cracks)

Replace crankcase

13

3.6

Carburetor

Problem

Cause

Remedy

Carburetor floods; engine stalls

Inlet needle not sealing – Foreign matter in valve seat or cone

Remove and clean inlet needle or clean carburetor

Inlet needle worn

Replace inlet needle

Inlet control lever sticking on spindle

Check inlet control lever, replace if necessary

Helical spring not located on nipple of inlet control lever

Remove the inlet control lever and refit it correctly

Perforated disc on diaphragm is deformed and presses constantly against the inlet control lever

Fit new metering diaphragm

Metering diaphragm is deformed, hardened or swollen

Fit new metering diaphragm

Low speed screw L "too lean"

Check basic setting, correct if necessary

High speed screw H "too lean"

Check basic setting, correct if necessary

Inlet needle sticking to valve seat

Remove and clean inlet needle

Diaphragm gasket leaking

Replace diaphragm gasket

Metering diaphragm is damaged, hardened or swollen

Fit new metering diaphragm

Tank vent faulty

Replace tank vent

Leak in fuel line between tank and carburetor

Check fuel hose, connector and connecting element, if necessary, push fuel line completely onto the connector or connecting element, or replace

Poor acceleration

14

MS 150 C, MS 150 TC

Problem

Cause

Remedy

Engine will not idle, idle speed too high

Throttle shutter opened too wide by idle speed screw LA

Set idle speed screw LA correctly

Oil seals / crankcase leaking

Seal or replace oil seals / crankcase

Throttle shutter does not close

Replace carburetor

Idle jet bores or ports blocked

Clean the carburetor

Low speed adjusting screw L "too rich" or "too lean"

Correct setting of low speed adjusting screw L

Idle speed screw LA setting incorrect – throttle shutter completely closed

Set idle speed screw LA correctly

Tank vent faulty

Replace tank vent

Leak in fuel line between tank and carburetor

Check fuel hose, connector and connecting element, if necessary, push fuel line completely onto the connector or connecting element, or replace

Idle speed too high

Readjust with idle speed screw LA (counterclockwise)

Engine stops when idling

Saw chain rotates at idle speed

Clutch springs stretched or fatigued Replace clutch springs or replace clutch Anchor loops of the clutch spring hooks are broken

MS 150 C, MS 150 TC

Replace clutch springs

15

Problem

Cause

Remedy

Machine smells of fuel or is losing fuel

Fuel hoses leaking or damaged

Check fuel hoses, connectors and connecting elements, if necessary, push fuel line completely onto the connector or connecting element, or replace

Fuel tank damaged

Replace engine housing

Pump diaphragms, metering diaphragms or diaphragm gasket faulty

Replace pump diaphragms, metering diaphragms or diaphragm gasket

Air filter dirty

Clean the air filter or replace if necessary

Throttle shutter not opened fully

Check throttle rod

Tank vent faulty

Replace tank vent

Fuel pickup body dirty

Replace the pickup body.

Fuel strainer dirty

Clean fuel strainer in carburetor or replace if necessary

Leak in fuel line between tank and carburetor

Check fuel hose, connector and connecting element, if necessary, push fuel line completely onto the connector or connecting element, or replace

Engine speed drops quickly under load – low power

16

MS 150 C, MS 150 TC

Problem

Cause

Remedy

Engine speed drops quickly under load – low power

High speed screw H "too rich"

Check basic setting, correct if necessary

Main jet bores or ports blocked

Clean the carburetor

Pump diaphragm damaged or fatigued

Fit new pump diaphragm

Incorrect ignition timing, flywheel out of adjustment – Guide rib in flywheel has sheared off

Install new flywheel

Engine runs extremely rich, lacks Choke shutter does not open power and has very low final speed

MS 150 C, MS 150 TC

Check carburetor, replace if necessary

17

3.7

Engine

Always check and, if necessary, repair the following parts before looking for faults on the engine: - Air filter - Fuel supply - Carburetor - Ignition system Problem

Cause

Remedy

Engine does not start easily, stalls at idle speed but operates normally at full throttle

Oil seals in engine defective

Replace oil seals

Crankcase leaking or damaged (cracks)

Check crankcase, reseal if necessary or replace

Intake manifold damaged / hole is plugged

Clean hole or replace intake manifold

Piston ring worn or broken

Replace piston ring

Muffler / spark arresting screen carbonized

Clean muffler (inlet and outlet openings), replace spark arresting screen, replace muffler if necessary

Air filter dirty

Clean or replace air filter

Fuel line kinked or cracked

Replace fuel line and ensure that is installed without kinking

Intake manifold damaged / hole is plugged

Clean hole or replace intake manifold

Insufficient cylinder cooling. Air inlets in fan housing blocked or cooling fins on cylinder very dirty

Thoroughly clean all cooling air openings and the cylinder fins

Air intake in fan housing is fouled

Clean air intake on fan housing

Engine does not deliver full power or runs erratically

Engine is overheated

18

MS 150 C, MS 150 TC

4.

Clutch

4.1

Clutch

– Troubleshooting, b 3.1

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

1

2011RA034 AM

Remove fan housing so that piston movement is not blocked by pawls on fanwheel.

: Turn the clutch (1) clockwise until the piston rests against the stop

2011RA045 AM

– Remove fan housing, b 8.2

– Clean all parts.

– Replace any damaged parts.

: Unscrew the clutch (1) with hexagon (arrow) – left-hand thread

1

Installation

1

1

– Unscrew spark plug

2

2011RA043 AM

: Remove the spark plug boot (1)

2011RA046 AM

1

2011RA032 AM

1

: Slip the retainers (1) onto the clutch shoes

: Use hook (2) 5910 890 2800 to remove the clutch springs (1)

1

– Pull the clutch shoes off the carrier

2

2011RA047 AM

: Insert the locking strip (1) 0000 893 5904 through the opening as far as it will go into the cylinder

2011RA044 AM

1

2011RA033 AM

1

: Fit the clutch shoes over the arms (1) so that the direction arrow (2) is on the same side as the raised hexagon (arrow).

: Pull the retainers (1) off the clutch shoes

MS 150 C, MS 150 TC

19

4.2

Clutch drum

– Remove fan housing, b 8.2

: Clamp the clutch in a vise (arrow)

2

1

2011RA035 AM

2011RA048 AM

– Release chain brake, remove chain sprocket cover, saw chain and guide bar – Remove the clutch, b 4.1

: Fit the clutch (1) on the crankshaft stub so that the raised hexagon (arrow) can be seen : Screw on and tighten the clutch (1) – left-handed thread

2011RA048 AM 2011RA049

– Reassemble remaining parts in reverse order – Install fan housing last, b 8.2

: Attach one end of the clutch spring (1) to the clutch shoes

: Remove the clutch drum (1) – Remove needle cage – Clean needle cage and crankshaft stub, b 14 – Coat the needle cage and crankshaft stub with STIHL multipurpose grease, b 14

2011RA050 AM

: Use the hook (2) 5910 890 2800 to attach the other end of the spring and press it firmly into the clutch shoe

1

2011RA036 AM

– Pull the locking strip out of the cylinder

1

On the side with the raised hexagon, the arrows indicating the direction of rotation must be visible on the clutch shoes.

20

MS 150 C, MS 150 TC

100% 80%

!

5902RA018 TG

1

: Examine the clutch drum (1) for signs of wear The remaining thickness must be measured if there are distinct signs of wear on the inside diameter of the clutch drum (1). The clutch drum must be replaced if the remaining thickness is less than approx. 80 % of the original thickness.

1

2011RA037 AM

Installation

– Slip the needle cage onto the crankshaft stub. : Slide the clutch drum (1) into place, making sure that the chain sprocket profile engages in the openings (arrow) of the worm – Install clutch, b 4.1 – Reassemble remaining parts in reverse order – Install fan housing last, b 8.2

MS 150 C, MS 150 TC

21

5.

Chain brake

5.1

Checking operation of chain brake

5.2

Brake band

– Troubleshooting, b 3.2

: Swivel out brake band (1) and unhook from brake lever (arrow)

Fouling (particularly with chain oil, chips, fine particles of abrasion, etc.) and smoothing of the friction surfaces of the brake band and clutch drum impair the coefficient of friction. This in turn extends the braking time. A fatigued or stretched brake spring has the same negative effect.

– Starting the engine

2011RA005 AM

The brake band must not be overstretched.

: Unscrew the screws (arrows)

– With the chain brake activated (locked), open the throttle wide for a brief period (max. 3 seconds) – the chain must not rotate

1

2011RA006 AM

– With the chain brake released, open the throttle wide and activate the brake manually – the chain must come to an abrupt stop The braking time is in order if deceleration of the saw chain is imperceptible to the eye (within a fraction of a second).

1 2011RA008 AM

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

2011RA009 AM

The chain brake is one of the most important safety devices on the chain saw. Its efficiency is measured in terms of the chain braking time, i.e., the time that elapses between activating the brake and the saw chain coming to a complete standstill.

Replace brake band if there are noticeable signs of wear on large areas on the inside diameter and/or parts of the outside (arrows) and its remaining thickness is < 0.6 mm.

: Pry the cover (1) out of the mount (arrow) using a screwdriver and remove

If the chain brake does not operate properly, refer to the troubleshooting chart, b 3.2.

2011RA007 AM

1

: Ease brake band (1) out of guide

22

MS 150 C, MS 150 TC

Installation

1

: Hook brake band (1) into brake lever (arrow).

2011RA013 AM

2011RA010 AM

1

: Press on cover (1) until the mounts engage (arrows)

2011RA015 AM

1

: Push out circlip (1)

– Insert and tighten the screws – Reassemble remaining parts in reverse order

1

– Check correct functioning

2

2011RA011 AM

5.3

2011RA016 AM

1 Brake lever

– Troubleshooting, b 3.2

: Draw hand guard (1) and brake lever (2) off the anchor pins (arrows) simultaneously

– Remove brake band, b 5.2

: Slide brake band (1) into the guides (arrows).

1 2 1

: Press brake band (1) into the mount (arrow) as far as it will go

– Block chain brake

2011RA017 AM

2011RA014 AM

1

2011RA012 AM

2

: Pull brake lever (2) out of hand guard (1)

The brake spring is now relaxed. : Use the assembly tool (2) 1117 890 0900 to unhook the brake spring (1) from the anchor pin (arrow)

– Pull out hand guard through the opening – Examine brake lever and hand guard; replace if necessary.

– Unhook and remove the brake spring at the brake lever

MS 150 C, MS 150 TC

23

Installation

1

: Apply a suitable tool to the tab (arrow) to prise the boot off the insert (1), examine it and replace if necessary.

– Grease anchor pins with STIHL lubricant, b 14

2011RA020 AM

2011RA018 AM

2011RA028 AM

1

: Slightly lift up bearing eye of the hand guard and brake lever and guide the parts over the pivot pins (arrows).

: Push hand guard (1) through the opening (arrow).

1

: Align the insert (1) with the tab (arrow) facing the edge of the cover and push into the mount as far as it will go – Check leaf spring, replace if necessary, b 5.4 – Clean disassembled parts, b 14

– Align brake lever – the forked opening (arrow) must face towards the brake band

2011RA021 AM

2

1 2011RA019 AM

2011RA029 AM

1

: Guide cams (arrow) on the hand guard (1) past the leaf spring (2) – Push brake lever and hand guard onto the anchor pins by moving hand guard back and forth slightly

: Slide brake lever (1) into opening in hand guard until the holes are lined up.

2011RA022 AM

1

: Push circlip (1) into place

24

MS 150 C, MS 150 TC

Installation

1

: Check hose (1), replace if necessary and push completely onto spring The pin for the brake spring must be replaced if it shows signs of wear at the groove, b 5.5

: Use the assembly tool (2) 1117 890 0900 to attach the brake spring (1) to the anchor pin (arrow) – Grease brake lever with STIHL lubricant, b 14 – Reassemble remaining parts in reverse order

5.4

2011RA027 AM

: Pull off the hose (1), the turns of the brake spring must be tightly spaced when not installed; replace brake spring if necessary.

1 2011RA025 AM

1

2011RA023 AM

2

: Slide leaf spring (1) into the guides (arrows).

– Grease leaf spring with STIHL lubricant, b 14 – Reassemble remaining parts in reverse order

Leaf spring 5.5

The leaf spring and cam on the hand guard is used to define the engaged position of the hand guard.

1

2011RA024 AM

– Remove brake lever, b 5.3

Pins

The pins ensure that the springs are securely mounted. If they are worn, replace the pins – brake spring can pop out.

For reasons of simplicity, the parts connected to the pins have already been removed in the following illustrations.

1

: Hook brake spring (1) into brake lever (arrow)

: Take out the leaf spring (1) and examine it, replace if necessary

2

2011RA030 AM

2011RA026 AM

1

: Pull the pin (1) and notched pin (2) out of the cover with a suitable tool.

MS 150 C, MS 150 TC

25

5.6

Chain tensioner

2

3

1

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

1

5

– Coat the knurled area of the new pin (1) with Loctite before fitting the pin, b 14

Turn the pin back and forth slightly until it fits.

: Examine the thrust pad (1), spur gear (2), adjusting screw (3), tensioner slide (4) and cover (5), replace if necessary.

1

3

2011RA038 AM

: The pin (1) must be inserted in the hole (arrow) so that the knurling on the pin engages the knurled profile.

2

: Turn the spur gear (1) clockwise until the tensioner slide (2) makes contact on the right : Unscrew the screw (3)

– Clean all disassembled parts with a little standard solvent-based degreasant not containing any chlorinated or halogenated hydrocarbons. Replace any damaged or worn parts, b 14.

Always replace the adjusting screw and spur gear together.

– Check correct functioning

1

a 1

– Reassemble parts in reverse order

View from the air filter side. : Carefully drive the pins (1) and notched pin (2) in with gentle taps until the following values have been reached: Pins (1) a = 5 mm Notched pin (2) b = 7.5 mm

– Coat the chain tensioner with STIHL multi-purpose grease, b 14

2011RA039 AM

7013RA033 TG

2

b

4

161RA054 TG

2011RA031 AM

– Troubleshooting, b 3.2

: Pull out the complete chain tensioner (1)

The pins must be driven in square.

– Grease brake lever and leaf spring with STIHL lubricant, b 14 – Reassemble remaining parts in reverse order

26

MS 150 C, MS 150 TC

5.6.1

Chain catcher

5.7

Bar mounting stud

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

1 2

1 2

2011RA040 AM

2

3

– Coat thread (1) of the stud with Loctite, b 14

4 3 – Remove chain sprocket cover, bar and chain. : Unscrew the screw (4) : Remove the chain catcher (3) – Reassemble parts in reverse order

2011RA041 AM

Removal

2011RA042 AM

Chain sprocket cover with integrally molded chain catcher (1).

If the chain catcher has broken (2), file down the stub and replace with a replacement chain catcher (3).

2011RA334 AM

1

: Position the repair stud by hand so that it engages the existing thread

: Push stud driver (1) 5910 893 0501 onto the stud (2) as far as it will go and unscrew counterclockwise

: Use stud driver (2) 5910 890 3000 to screw in and tighten the repair stud perpendicular to the supporting surface

– Check the stud, replace if necessary

: Unscrew stud driver

– Coat stud with Loctite, screw in and tighten, b 14

– Reassemble remaining parts in reverse order

– Reassemble remaining parts in reverse order

If the thread on the engine housing is too badly damaged, replace the engine housing.

Repair solution If the thread on the engine housing is badly damaged or stripped, the standard stud can no longer be tightened to the specified tightening torque – the attachment of the stud is no longer guaranteed.

In this case, repair stud 1123 664 2405 can be used as a repair solution. : Unscrew standard stud – do not drill out the bore

MS 150 C, MS 150 TC

27

Engine

6.1

Muffler

1 2 3

Check and if necessary repair the fuel supply, carburetor, air filter and ignition system before looking for faults on the engine.

To keep dirt particles from entering the cylinder, move piston to top dead center (D. C.) before removing the muffler.

2011RA133 AM

– Troubleshooting, b 3.7

: Unscrew screw (1), remove cover (2) and take out spark arresting screen (3), if present

2011RA070 AM

6.

: Carefully slide in muffler and position

– Clean the spark arresting screen (3), replace if necessary

– Fit screws and check that the muffler is correctly positioned – Insert and tighten the screws

1

2

Installation

– Reassemble remaining parts in reverse order

2011RA067 AM

1

6.2

: Remove screws (1) 2011RA069 AM

: Take out the muffler (2) and examine it, replace if necessary

: Examine and clean the mating surfaces (arrows), b 14

2011RA068 AM

Parts with damaged mating faces must be replaced.

: Check the outer edge (arrows), if damaged, replace the muffler

28

Leak testing

Defective oil seals and gaskets or cracks in housing are the usual causes of leaks. Such faults allow supplementary air to enter the engine and upset the fuel-air mixture.

This makes adjustment of the prescribed idle speed difficult, if not impossible.

Moreover, the transition from idle speed to part or full throttle is not smooth.

Always start with the vacuum test and then continue with the pressure test.

The engine can be thoroughly checked for leaks under vacuum and at gauge pressure using the pump 0000 850 1300.

MS 150 C, MS 150 TC

Preparations

Version MS 150 C

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

3 3

2

: Roll in sealing plate (1) 0000 855 8106 at the wide end and push the thinner end between the cylinder exhaust and flange

– Unplug the spark plug boot – Unscrew spark plug – Set the piston to the top dead center (D. C.) (this can be checked through the spark plug hole) – Fit the spark plug and tighten it down firmly.

: Insert screw (3) and tighten both screws slightly

: Align the flange (1) 5910 850 4203 so that the recesses engage across the threaded bushing and so that the screw (2) seals the impulse hose (arrow)

The sealing plate must fill the full width between the screws.

: Fit flange (1) 5910 850 4203, insert screws (3) and tighten

– Remove the carburetor, b 12.4 Version MS 150 TC

– Remove the muffler, b 6.1 Flange 5910 850 4203

1

3 2

: Fit flange (1) 1123 855 4200 : Insert the screw (2)

3

2011RA073 AM

1 2011RA071 AM

1

2011RA134 AM

1

3

2011RA072 AM

With MS 150 C and MS 150 TC, the handle housing and position of the carburetor are different, the preparation work and tests however are the same for both machines.

1

The recesses (arrows) must engage across the threaded bushing.

The screw (1) must be present – it seals the impulse hose.

2

2011RA135 AM

6.2.1

: Align the flange (1) 5910 850 4203 so that the recesses engage across the threaded bushing and so that the screw (2) seals the impulse hose (arrow) : Fit flange (1) 5910 850 4203, insert screws (3) and tighten

MS 150 C, MS 150 TC

29

Testing with negative pressure

6.2.3

Oil seals tend to fail when subjected to a vacuum. In other words, the sealing lip lifts away from the crankshaft during the piston's induction stroke because there is no internal counterpressure.

Pressure test

The same preparatory steps are required as for the vacuum test, b 6.2.2.

– Refit the muffler, b 6.1 – Reassemble remaining parts in reverse order

This kind of fault can be detected by testing with pump 0000 850 1300.

4

– Remove flange 4224 893 2501 and sealing plate 0000 855 8107

3

2

1

3

2011RA137 AM

6.2.2

1 2

2011RA136 AM

: Slide ring (1) to the right – Pressure test

: Push the hose (1) of pump 0000 850 1300 onto the connector (arrow) : Slide ring (2) to the left – Vacuum test : Operate lever (3) until the pressure gauge (4) indicates a vacuum of 0.5 bar If the vacuum reading remains constant, or does not decrease by more than 0.3 bar within 20 seconds, it may be assumed that the oil seals are in good condition.

If the vacuum in the crankcase is reduced further, the oil seals must be replaced, b 6.3.

– After testing, slide the ring on the pump back to the right to vent the pump – Continue with pressure test, b 6.2.3

30

: Operate the lever (2) until the pressure gauge (3) indicates a pressure of 0.5 bar. If this pressure remains constant for at least 20 seconds, the engine crankcase is airtight – If the pressure drops, the leak must be located and the faulty part replaced.

To find the leak, coat the suspect area with soapy water and pressurize the crankcase. Bubbles will appear if a leak exists.

– After testing, slide the ring on the pump to the left to vent the pump – disconnect the hose.

– Remove flange 5910 850 4203 on intake elbow

Installation – Install the carburetor, MS 150 C b 12.4, MS 150 TC b 12.4

MS 150 C, MS 150 TC

6.3

Oil seals

It is not necessary to disassemble the complete engine in order to replace the oil seals.

2

When removing the oil seals with puller 5910 890 4400, use jaws 0000 890 3700.

6.3.1

: Push the threaded sleeve (2) 5910 890 1800 over the threaded sleeve and crankshaft as far as it will go

Ignition side

2011RA296 AM

1

: Fit the assembly sleeve (1) 1146 893 4601

: Remove threaded sleeves The seating face must be flat and free from burrs.

– Remove fan housing, b 8.2 : Slide the oil seal (2) over the assembly sleeve with the open side facing the crankcase

– Remove flywheel, b 7.6

: Turn the spindle of the threaded sleeve counterclockwise until the oil seal is pressed into the crankcase (left-handed thread)

– Clean the cone of the crankshaft to ensure it is completely greasefree, b 14

– Remove the assembly sleeve (1)

– Reassemble remaining parts in reverse order

6.3.2

1

1

2

2011RA297 AM

2011RA295 AM

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

Avoid damage to the crankshaft stub.

– Free the oil seal in its seat by tapping it with a suitable tube or a punch.

Clutch side

– Remove clutch, b 4.1 – Remove clutch drum, b 4.2

: Orient press sleeve (1) 5910 893 1710 with the small collar (arrow) facing the engine

– Remove oil pump, b 11.4 – Remove circlip, b 6.6

: Position puller (1) 5910 890 4400 – Clamp the puller arms

1

– Pull out the oil seal

2

– Coat the sealing lips of the new oil seal with STIHL grease, b 14

MS 150 C, MS 150 TC

: Screw the threaded sleeve (1) 5910 893 2403 onto the crankshaft stub as far as it will go

1

2011RA298 AM

– Clean the mating surface, b 14

2011RA416 AM

Installation

Avoid damage to the crankshaft stub.

31

– Free the oil seal in its seat by tapping it with a suitable tube or a punch.

6.4

The complete engine must be removed before disassembling the piston or cylinder.

2

: Position puller (1) 5910 890 4400

2011RA300 AM

– Clamp the puller arms – Pull out the oil seal

1

Installation – Clean the mating surface, b 14

Engine

: Orient press sleeve (1) 5910 893 1710 with the small collar (arrow) facing the engine

– Release chain brake, remove chain sprocket cover, saw chain and guide bar – Drain fuel tank and oil tank, b 1 – Remove fan housing, b 8.2 – Remove the carburetor, b 12.4

– Coat the sealing lips of the new oil seal with STIHL grease, b 14

– Remove the handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5

1 2

– Remove the intake elbow, b 12.7

: Fit the assembly sleeve (1) 1146 893 4600 : Slide the oil seal (2) over the assembly sleeve with the open side facing the crankcase

: Screw the threaded sleeve (1) 5910 893 2404 onto the crankshaft stub as far as it will go

– Remove the flywheel, b 7.6

1

: Push the threaded sleeve (2) 5910 890 1800 over the threaded sleeve and crankshaft as far as it will go

2011RA301 AM

1

2011RA299 AM

2011RA416 AM

2

: Remove threaded sleeves

– Remove the assembly sleeve (1)

: Remove worm (1) The seating face must be flat and free from burrs.

: Take out the screws (arrows)

– Reassemble remaining parts in reverse order

32

MS 150 C, MS 150 TC

MS 150 TC

6.5

Cylinder

1

2011RA303 AM

2011RA387 AM

– Remove the engine, b 6.4

2011RA305 AM

: Unscrew the screw (arrows) : Disconnect the short circuit line (1) : Unscrew the screws (arrows)

1 2

2011RA302 AM

All versions

1 2011RA304 AM

2011RA306 AM

: Unplug spark plug boot (1) : Unscrew the spark plug (2) : Unscrew the screw (arrows)

: Completely remove the engine with muffler and ignition device from the housing

MS 150 C

: Carefully pull off the cylinder (1)

– Remove the muffler, b 6.1 – Remove the ignition module, b 7.2

2011RA224 AM

1

– Reassemble parts in reverse order

1 2011RA307 AM

2

: Remove the cylinder gasket (1)

: Disconnect the short circuit line (1) : Remove the screw (arrow) : Disconnect the ground wire (2)

MS 150 C, MS 150 TC

33

1

: Examine and clean the mating surface (arrow), b 14

: Place wooden assembly block (1) 1108 893 4800 between piston and crankcase

The mating surfaces on the cylinder and crankcase must be in perfect condition and without any damage whatsoever – and check the mating surfaces on the exhaust bore and intake port.

Replace parts with damaged mating surfaces – engine operation may be impaired even by the slightest damage, b 3.7.

Installation

2

: Position cylinder (1) so that the spark plug hole (arrow) is facing the crankshaft stub on the clutch side (2)

Ensure that the cylinder gasket is not moved or damaged.

When fitting the cylinder over the piston, ensure that the clamping strap securely encloses the piston and that the piston ring does not protrude – danger of breakage.

1

2011RA311 AM

Always use a new cylinder gasket after removing the cylinder.

2011RA312 AM

2011RA310 AM

2011RA308 AM

1

: Slide the cylinder (1) over the piston; the clamping strap is pushed downwards at the same time

– Coat piston, piston ring and inside of cylinder with oil, b 14

2011RA309 AM

1

: Align the new cylinder gasket (1) so that the shape matches and the tab (2) engages in the opening (arrow) on the cylinder

1 2

2011RA313 AM

: Fit clamping strap (1) 0000 893 2600 around piston and piston ring

2

– Ensure that piston ring is correctly positioned, b 6.8 The clamping strap (1) must be fitted in such a way that the piston ring does not protrude beyond the piston sides.

: Remove clamping strap (1) and wooden assembly block (2) Ensure that the cylinder gasket is correctly positioned.

: Fit the cylinder gasket (1)

34

MS 150 C, MS 150 TC

The starter-side half of the crankcase is pulled off in this way and the two halves of the crankcase separated.

– Push cylinder home as far as possible

2011RA389 AM

2011RA305 AM

– Undo the screws and remove the puller

: Unscrew the screws (arrows)

Rework 33.1

: Fit screws (arrows) and secure cylinder with gasket.

30.1

3 27

Crankshaft / crankcase

– Remove the piston, b 6.7 Always replace ball bearings and oil seals when removing the crankshaft, b 6.6.1, b 6.3.

Clutch side half of crankcase

: Insert M5x50 screws (3) through the holes marked "27" and screw them as far as possible into the crankcase half.

27

2011RA391 AM

22

: Align the assembly tool with the washer (2) 5910 893 2103 against the ignition-side half of the housing so that the edge number "27" (arrow) is at the bottom in the middle

– Remove the engine, b 6.4

27

30.8

2 3

2011RA390 AM

3

– Reassemble remaining parts in reverse order

2.8

1

13.9

: Tighten the screws (arrows) down crosswise.

6.6

– Replace ball bearings and oil seals, b 6.6.1, b 6.3.

23 24 27

5.4

Assembly tools without "27" hole can be reworked as illustrated.

The diagram shows the drilled plate as seen from above, dimensions are given in millimeters.

Ignition-side half of crankcase

1

2011RA388 AM

1

: Push circlip (1) sideways out of the groove

MS 150 C, MS 150 TC

: Turn the spindle counterclockwise until the crankshaft is forced out of the ignition-side half of the crankcase.

2011RA392 AM

: Unscrew the spindle (1) of the installing tool 5910 007 2201 until the flange contacts the crankshaft – left-hand thread.

: Position the crankcase half (1) on suitable surface so that it is held securely and the installed guide sleeves are not damaged

35

There must be sufficient clearance downward so that the crankshaft can be pressed out.

: Orient the press sleeve (1) 5910 893 1710 with the large collar (arrow) facing the crankcase and push onto the crankshaft (2)

3 2 1

: Position punch (1) on the ignition-side crankshaft stub and press out crankshaft (2)

: Screw the threaded sleeve (3) 5910 893 2403 onto the crankshaft stub as far as it will go

: The crankshaft (1), connecting rod (2) and the needle bearing between them and the roller bearing (3) make up a complete unit and must therefore always be replaced as a unit if damaged

1

2011RA407 AM

2

2011RA393 AM

2011RA395 AM

1

– Replace ball bearing, b 6.6.1 – Clean crankshaft, b 14

: Push the threaded sleeve (1) 5910 890 1800 over the threaded sleeve and crankshaft as far as it will go

Avoid damage to the crankshaft stubs.

Avoid damage to the crankshaft stub.

: Unscrew threaded sleeves from crankshaft and remove with press sleeve

: Examine and clean the mating surfaces (arrows) of the ignitionside and clutch-side halves of the crankcase (including the cylinder sealing surface) – remove any gasket residues if necessary – the mating surfaces must not display any signs of damage, b 14.

1

3 2 1

: Guide the crankshaft (2) with the long crankshaft stub through the crankcase from the inside outwards – the roller bearing must face upwards

36

2011RA397 AM

– Check the crankcase halves, replace if necessary, b 6.6

: Turn the spindle of the threaded sleeve counterclockwise until the crankshaft is drawn into the crankcase (left-handed thread)

2011RA414 AM

2011RA394 AM

Installation Clutch-side half of crankcase

: Apply sealant (1) evenly to the circumferential mating surface (arrows)

MS 150 C, MS 150 TC

2011RA400 AM

– Apply sealant so that a bead with a height of a = 1 mm is formed

3 2 1

– To guarantee a perfect seal for the crankcase, the crankcase halves must be assembled as soon as the sealant has been applied – leaks caused by driedup sealant.

– Coat the cylindrical crankshaft stub with oil

: Screw the threaded sleeve (3) 5910 893 2404 onto the crankshaft stub as far as it will go

– Examine and install the piston, b 6.7

2

3

2

: Insert screws (1) so that the guide sleeves (2) align with the bores (arrows)

2011RA399 AM

: Push the threaded sleeve (1) 5910 890 1800 over the threaded sleeve and crankshaft as far as it will go

1

1

: Push circlip (1) sideways into the groove

1

2011RA406 AM

1

: Tighten screws (arrows)

: Orient the press sleeve (1) 5910 893 1710 with the large collar (arrow) facing the crankcase and push onto the crankshaft (2)

Ignition-side half of crankcase Avoid damage to the crankshaft stub.

: Screw in screws (arrows) uniformly and alternately

2011RA401 AM

– Sealant must not protrude into the inside of the crankcase.

2011RA415 AM

2011RA398 AM

a

: Slide the crankcase half (3) on until the guide sleeves (2) are in as far as they will go

– Examine and install the cylinder, b 6.5 – Reassemble remaining parts in reverse order

: Turn the spindle of the threaded sleeve counterclockwise until the crankshaft is drawn into the crankcase and the crankcase halves are completely together (left-handed thread) : Unscrew threaded sleeves from crankshaft and remove with press sleeve

MS 150 C, MS 150 TC

37

6.6.1

Ball bearing / crankcase

Ignition-side half of the crankcase

: Carefully drive the oil seal out with a suitable punch

– Disassemble crankcase halves, b 6.6 – Wear protective gloves – risk of burns Since the crankcase halves are heated up for the installation or removal of the ball bearings, all heat-sensitive parts must be removed.

The ball bearing (1) drops out on its own when this temperature is reached.

Installation

2011RA326 AM

Examine both halves of the crankcase for cracks and check all mating surfaces for signs of damage.

– Refer also to Troubleshooting, b 3.7

– Heat the area around the bearing seat to approx. 160 °C (320 °F)

1

: Examine and clean the crankcase half, replace if necessary, b 14 Replace the ball bearings if the crankcase half is in good condition.

2011RA328 AM

If the old crankcase is reused, the oil seals and ball bearings must be replaced, all gasket residues removed and the mating surfaces cleaned thoroughly. The mating surfaces must be absolutely clean to guarantee a perfect seal.

1 2011RA325 AM

New crankcases are delivered with the relevant components preassembled – see spare parts list.

Those parts which are not supplied with the new crankcase must be removed from the old crankcase halves, examined and replaced if necessary.

2011RA327 AM

The two halves of the crankcase can be replaced individually if they are defective.

– Heat the area around the bearing seat to approx. 160 °C (320 °F) – Align the ball bearing so that the plastic ring faces the outside of the case : Press the ball bearing (1) home as far as possible The ball bearing must be fitted rapidly, as it absorbs heat and expands, use press sleeve 1129 893 2400 if necessary.

38

MS 150 C, MS 150 TC

Clutch-side half of the crankcase

Installation

6.7

Piston

– Remove the cylinder, b 6.5 The piston has two snap rings.

: Carefully drive the oil seal out with a suitable punch

2011RA332 AM

2011RA329 AM

1

The assembly drift can be inserted through the fitted snap ring, thus only one snap ring must be removed – remove snap ring on the side with the recess.

– Heat the area around the bearing seat to approx. 160 °C (320 °F)

2011RA314 AM

– Align the ball bearing so that the plastic ring faces the outside of the case

2011RA330 AM

: Press the ball bearing (1) home as far as possible

: Examine and clean the crankcase half, replace if necessary, b 14

The ball bearing must be fitted rapidly, as it absorbs heat and expands, use press sleeve 1129 893 2400 if necessary.

: Use a suitable tool to prise the snap ring out at the recess (arrow).

– Install crankshaft and assemble crankcase halves, b 6.6

Replace the ball bearings if the crankcase half is in good condition.

– Install oil seals, b 6.3

1 2

1

2011RA331 AM

2011RA315 AM

– Reassemble remaining parts in reverse order

– Heat the area around the bearing seat to approx. 160 °C (320 °F) The ball bearing (1) drops out on its own when this temperature is reached.

MS 150 C, MS 150 TC

: Push assembly drift (1) 1130 893 4700 through the installed snap ring and push out piston pin (2) If the piston pin is stuck, tap the end of the drift gently with a hammer to loosen it.

The piston must be held steady during this process to ensure that jolts are not transmitted to the connecting rod.

39

– Remove and examine the piston, replace if necessary.

1

2011RA318 AM

2

Installation – Coat the needle cage with oil.

– Coat the piston pin with oil : Fit the piston pin (2) on the stub of the assembly drift (1) 1130 893 4700 and slide it into the piston

: Push the slotted opening of the sleeve over the magnet and snap ring The internal pin must point towards the flat surface on the shaft.

2011RA316 AM

1

7013RA504 TG

– Examine the piston ring and replace if necessary, b 6.8

1

2

: Remove the sleeve (1) from the assembly tool (2) 5910 890 2209

1

7013RA505 TG

: Position the piston (1) on the rod eye

7013RA503 TG

– Line up the piston (1) so that the arrow in the piston base points towards the raised part (arrow)

: Press the assembly tool down in the sleeve until the magnet is at the end of the guide slits

: Push assembly drift (1) 1130 893 4700 with the stub end first through piston hole and rod eye (needle cage) and secure the piston

40

2

1

: Attach the snap ring (1) to the magnet (2) and align it so that the snap ring gap is on the flat side (arrow)

161RA396 TG

: Place the assembly drift (1) 1130 893 4700 on the side with the installed snap ring

165RA153 TG

2011RA317 AM

Stand the tool on a suitable surface.

: Remove the sleeve and push it over the opposite end of the assembly tool's shank.

MS 150 C, MS 150 TC

Installation

: Fit the assembly tool 5910 890 2209 with the taper sleeve on the piston boss, hold the piston steady and press the tool shank home until the snap ring slips into the groove The assembly tool must be precisely aligned in axial direction of the piston pin.

2011RA323 AM

– Examine the piston ring and replace if necessary, b 6.8

: Align the new piston ring so that the radii at the ends of the ring (arrows) face upwards

– Install the cylinder, b 6.5 – Reassemble remaining parts in reverse order

6.8

Piston ring

– Remove the piston, b 6.7 2011RA324 AM

2011RA319 AM

2011RA321 AM

The internal pin must point towards the flat surface on the shaft.

– Remove piston ring from piston

The snap ring (1) must be fitted so that the gap in the ring (arrow) points upwards in axial direction of the piston.

MS 150 C, MS 150 TC

2011RA322 AM

1

2011RA320 AM

: Install the piston ring so that the radii at the ring gaps meet at the fixing pins (arrows) in the piston groove

: Use a piece of old piston ring to scrape the groove clean (arrow)

: Check the correct installed position of the piston ring again (arrow) – Install the piston, b 6.7 – Reassemble remaining parts in reverse order

41

Ignition system

Troubleshooting on the ignition system should always start with the spark plug, b 3.5

7.1

Ignition timing

MS 150 C

Ignition timing is fixed and cannot be adjusted during repair work.

Since there is no mechanical wear in these systems, ignition timing cannot get out of adjustment during operation.

2

2011RA195 AM

Exercise extreme caution while carrying out maintenance and repair work on the ignition system. The high voltages which occur can cause serious or fatal accidents.

– Remove fan housing, b 8.2 7.2

1

2011RA193 AM

2

1

Ignition module

– Remove fan housing, b 8.2

: Disconnect the short circuit line (1)

– Removing the chain sprocket cover

: Take out screws (arrow)

– Remove spark plug boot, b 7.5

: Disconnect the ground wire (2)

MS 150 TC

Both versions

1

The ignition module accommodates all the components required to control ignition timing. There are two electrical connections on the coil body:

1

1. High-voltage output with permanently installed ignition lead.

: Disconnect the short circuit line (1)

2. Connector tab for the short circuit wire

: Take out screws (arrow)

Testing of the ignition module is limited to a spark test. A new ignition module must be installed if no ignition spark is obtained (after checking that the wiring and switch shaft are in good condition).

42

2011RA194 AM

The electronic ignition system basically consists of an ignition module (1) and flywheel (2).

3 4

2

2011RA196 AM

7.

: Remove ignition module (1) with insulating element (2) and pull out of the engine housing with ignition lead (3) and cable holder (4) A damaged ignition lead can only be replaced together with the ignition module.

MS 150 C, MS 150 TC

7.3.1

4

: Install engine analyzer between spark plug and spark plug boot

A

: Push ignition lead (3) through engine housing

: Replace chain with chain without cutters 3114 003 0064 2011RA199 AM

1

2011RA197 AM

: Slide the setting gauge (1) 1111 890 6400 between the arms of the ignition module and the magnet pole of the flywheel.

: Push cable holder (4) at a distance A = 4.9 cm to the ignition module onto ignition lead (3) and push as far as possible onto cylinder fins

– Press the ignition module against the setting gauge.

2011RA333 AM

3

Preparations

– Tighten the screws – Reassemble parts in reverse order

2011RA198 AM

– Moderately tighten the screws on the ignition module.

: Turn the flywheel until the ignition magnet group is lined up with the ignition module, poles must be aligned as shown

MS 150 C, MS 150 TC

– Observe the tightening torques, b 2.5

: Remove chain sprocket cover and replace with universal shroud 5910 890 3201

– Reassemble remaining parts in reverse order

Maximum tightening torque of collar nut of 25 Nm must not be exceeded.

7.3

– Run test – see instruction manual for STIHL MDG 1 engine analyzer

Testing with STIHL MDG 1

The STIHL MDG 1 engine analyzer is used to easily, reliably and quickly test ignition modules and components.

The following is tested during the test run: – Ignition voltage – Spark – Prespark (spark plug not working perfectly) – Short circuit

43

Testing the ignition module

– If no spark is visible in the window (2), check the ignition system with the aid of the troubleshooting chart, b 7.10

To test the ignition module, use either the ZAT 4 ignition system tester 5910 850 4503 or the ZAT 3 ignition system tester 5910 850 4520.

5

Using the ZAT 3 ignition system tester 5910 850 4520

The ignition test refers only to a spark test, not to the ignition timing.

2

1 2

3

4

165RA184 TG

Using the ZAT 4 ignition system tester 5910 850 4503

2

3

165RA183 TG

– Before starting the test, install a new spark plug and tighten it down firmly

1

– Before starting the test, install a new spark plug in the cylinder and tighten it down firmly. : Connect the spark plug boot to the input terminal (1). Push the tester's output terminal (3) onto the spark plug Danger! High voltage – risk of electrocution.

1

: Connect the spark plug boot to the terminal (2) : Attach ground terminal (1) to the spark plug : Use adjusting knob (4) to set spark gap to approx. 2 mm, see window (3)

3 4

165RA185 TG

7.4

While using the ZAT 3, hold it only by the handle (4) or position it in a safe place. Keep fingers or other parts of your body at least 1 cm away from the spark window (3), high-voltage connection (2), ground connection (5) and the ground terminal (1).

Danger! High voltage – risk of electrocution.

– Crank the engine quickly with the rewind starter and check sparkover in the window (3) of the ignition system tester The engine may start and accelerate during the test.

If a spark is visible in the window (3), the ignition system is in order.

– If no spark is visible in the window (3), check the ignition system with the aid of the troubleshooting chart, b 7.10

– Crank the engine quickly with the rewind starter and check sparkover in the window (2) of the ignition system tester The engine may start and accelerate during the test.

If a spark is visible, the ignition system is in order.

44

MS 150 C, MS 150 TC

7.5

Spark plug boot / ignition lead

Installation

165RA188 TG

– Removing the chain sprocket cover – Unplug the spark plug boot

2310RA127 TG

– With a new ignition module, use a pointed tool to pierce the center of the new lead's insulation approx. 15 mm from the end of the ignition lead : Pinch the hook of the torsion spring into the center of the ignition lead (arrow) where it has been pierced

2310RA129 TG

Ignition module and ignition lead form a complete unit. If the ignition lead is damaged, the ignition module must be replaced.

: Ensure that the torsion spring (arrow) is located in the recess – Push the spark plug boot onto the spark plug.

– Reassemble remaining parts in reverse order

7.6

Flywheel

– Remove fan housing, b 8.2

: Use suitable pliers to pull the torsion spring out of the spark plug boot

– Block the crankshaft with the locking strip, b 4.1

2310RA128 TG

– Unhook the torsion spring from the ignition lead – Pull the boot off the ignition lead

– Apply STIHL press fluid to the inside of the spark plug boot, b 14 : Push the ignition lead and torsion spring into the spark plug boot

2011RA200 AM

– Check ignition lead, replace ignition module if necessary, b 7.2

: Remove the collar nut (arrow).

– Remove the flywheel.

Use the threaded sleeve if the flywheel is stuck.

MS 150 C, MS 150 TC

45

Installation

7.7

Flywheel and crankshaft stub must be free from grease for installation.

7.7.1 2011RA203 AM

: Screw on the threaded sleeve (1) 5910 893 2403 as far as it will go – turn back by half a turn – and release flywheel with gentle taps on the face of the threaded sleeve

2011RA202 AM

– Remove fan housing, b 8.2

Ensure that the machined guide rib (arrow) engages the slot in the crankshaft.

2

– Fit the flywheel, screw on the nut and tighten – Observe the tightening torques, b 2.5

Flywheel and magnet poles (arrows) must not show any signs of damage or blue discoloration, otherwise the flywheel must be replaced.

Testing

1

2011RA204 AM

: Unscrew the threaded sleeve (1) 5910 893 2403 from the crankshaft stub and remove flywheel

Ground wire and short circuit wire are combined into one wiring harness.

Check the short circuit wire if the spark plug and ignition lead with spark plug boot are in order.

2011RA201 AM

1

Short circuit wire

– Set the air gap between the ignition module and flywheel, b 7.2

: Disconnect the short circuit wire (1)

– Reassemble remaining parts in reverse order

: Connect ohmmeter to ground (2) and blade receptacle (1) of the short circuit wire – Move the Master Control lever to "STOP" or "0" The resistance measured must be approx. 0 Ω. If it is much higher, the reason is a break in the wire and the wiring harness must be replaced, b 7.7 – Move the Master Control lever to "F" The resistance measured must be infinitely high, otherwise replace the wiring harness, b 7.7.

46

MS 150 C, MS 150 TC

3

– If no fault can be found, test the ignition system in accordance with flow chart, b 7.10 – Reassemble parts in reverse order

Removal and installation

MS 150 TC

2 : Disconnect the short circuit wire (1)

: Take out the screws (arrows) and remove the ground wire (2).

: Pull short circuit wire out of cable guide (2) and disconnect ground wire (3)

: Disconnect the short circuit wire (1)

– Remove contact spring, b 7.9

– Remove fan housing, b 8.2

– Check wiring harness and contact springs, replace if necessary

– Remove chain sprocket cover – Remove handle molding and actuating levers, b 10.3 – Remove switch shaft, b 10.1.2 – Remove antivibration spring of handle housing / engine housing b 9.3

– Reassemble parts in reverse order – Set the air gap between the ignition module and flywheel, b 7.2 – Reassemble remaining parts in reverse order

2

– Observe the tightening torques, b 2.5

: Press in tabs (1) with a screwdriver, lift cover (2) and remove sideways

MS 150 C, MS 150 TC

2011RA207 AM

MS 150 C

1

1

– Remove fan housing, b 8.2 – Remove filter base, b 12.3 – Remove switch shaft, b 10.1.1 – Remove contact spring, b 7.9

2011RA211 AM

7.7.2

1

2011RA195 AM

2

2011RA205 AM

Also carry out a contact and continuity test of the ground wire between the terminal socket and the contact spring or between the cable lugs and the contact springs, replace wiring harness if necessary.

: Remove cable guides (arrow) from the retainers – Check wiring harness and contact springs, replace if necessary – Reassemble parts in reverse order – Set the air gap between the ignition module and flywheel, b 7.2 – Reassemble remaining parts in reverse order – Observe the tightening torques, b 2.5

47

Ground wire

Ground wire and short circuit wire are combined into one wiring harness, testing and installation are the same and is described in the chapter "Short circuit wire".

1 : Press sleeve (1) out of the contact spring (2)

Contact spring

MS 150 C The ground wire must be seated firmly in the eye of the contact spring, if necessary, carry out a contact and continuity test, b 7.7.1.

– Check contact spring, replace if necessary

: Check correct functioning – Terminal socket of the short circuit wire must touch the contact spring (arrow) in position "0"

Installation

– Reassemble remaining parts in reverse order

MS 150 TC

– Remove interlock lever and throttle trigger, b 10.2

The ground wire must be pressed firmly onto the contact spring, if necessary, carry out a contact and continuity test, b 7.7.1.

2

– Remove switch shaft and set aside with short circuit wire fitted, b 10.1.1

1

: Push sleeve (1) into the eye (arrow) of the contact spring (2) so that it is flush on the opposite side and does not protrude

– Remove switch shaft, b 10.1.2 – Remove antivibration spring, b 9.3

2011RA212 AM

1

– Remove interlock lever and throttle trigger, b 10.3

3

: Lift tab (1) slightly and push the contact spring to the left out of the retainer

2011RA215 AM

1

: Push contact spring to the right into the retainer until the spring engages

4 2

2011RA217 AM

7.9

2011RA213 AM

– Carry out a contact and continuity test, replace wiring harness if necessary, b 7.7

2011RA216 AM

2

2011RA214 AM

7.8

: Pull contact spring (1) of short circuit wire (2) and contact spring (3) of ground wire (4) out of the guides (arrows)

– Install switch shaft with short circuit wire fitted, b 10.1.1

48

MS 150 C, MS 150 TC

– Install antivibration spring, b 9.3 – Install switch shaft, b 10.1.2

2

3

1 2011RA218 AM

4

: Remove blade receptacle (1) of short circuit wire (2) and blade receptacle (3) of ground wire (4) – Check contact springs and wiring harness, replace if necessary

3

2

: Push blade receptacle (1) of ground wire (2) onto the contact spring (3) so that the crimped side faces the spring loop (arrow) – wide blade receptacle to wide contact spring

Installation

3

2011RA221 AM

2

– Reassemble remaining parts in reverse order

: Press contact spring (1) of ground wire (2) as far as it will go into the guides (arrows)

1

2

2011RA222 AM

2011RA220 AM

1

: Push blade receptacle (1) of short circuit wire (2) onto the contact spring (3) so that the crimped side faces the spring loop (arrow) – narrow blade receptacle to narrow contact spring

: Check correct functioning – Contact springs of short circuit wire (1) and ground wire (2) must make contact with the metal pin (arrow) of the switch shaft (3) when in position "0" – Install interlock lever and throttle trigger, b 10.3

1

2

1 2

2011RA223 AM

1

2011RA219 AM

3

: Press contact spring (1) of short circuit wire (2) as far as it will go into the guides (arrows)

MS 150 C, MS 150 TC

49

7.10

Troubleshooting, ignition system

Engine does not run

Master Control lever: – in position "F"?

Check spark plug: – Smeared with oil, black?

– Sooted?

– Electrode gap correct?

– Contacts shorted (threads)?

– Clean, adjust or replace spark plug, b 7.4

Check spark plug boot: – Firmly seated on spark plug (torsion spring)?

– Torsion spring hook in center of ignition lead?

– Spark plug boot damaged?

– Replace spark plug boot and/or torsion spring if necessary, b 7.5

Check ignition: –with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap see TI 32.94), b 7.4

1 50

MS 150 C, MS 150 TC

1

Spark present?

yes

no Air gap: – Check ignition module / flywheel, – adjust if necessary, b 7.2

Check flywheel: – Have pole shoes turned "blue"?

– Replace flywheel if necessary, b 7.6

Check short circuit wire: – Wire damaged?

– Plug connections firmly seated?

– Check continuity, replace wiring harness if necessary, b 7.7.1

Check ignition lead: – Severe chafing?

– Spark plug boot: Holes / cracks?

– Resistance of spark plug boot to ground: Required 1.5...12 kΩ – Check resistance of spark plug lead to ground, (spark plug boot and ignition module have been removed) Value: Required < 10 Ω, Replace spark plug boot and/or ignition module if necessary, b 7.5

2 MS 150 C, MS 150 TC

3 51

2

3

Switch shaft Check correct operation: – Short circuit wire chafed?

– Function between contact spring and contact of the switch shaft: – Position "F" = no connection – Position "0" = connection – replace wiring harness if necessary, b 7.7

Spark present?

yes

no Replace ignition module. b 7.2

yes

Engine runs smoothly, troubleshooting procedure completed

52

Machine runs?

no

– Look for fault in fuel or carburetor system – Check engine for leaks – Check position of flywheel on crankshaft, b 6.2, b 7.6

MS 150 C, MS 150 TC

General

If the action of the starter rope becomes very stiff and the rope rewinds very slowly or not completely, it may be assumed that the starter mechanism is in order but plugged with dirt. At very low outside temperatures, the lubricating oil on the rewind spring may thicken and cause the spring windings to stick together. This has a detrimental effect on the function of the starter mechanism.

To clean the rewind spring, it is sufficient to apply a few drops of a standard solvent-based degreasant not containing any chlorinated or halogenated hydrocarbons to the rewind spring.

Carefully pull out the starter rope several times and allow it to rewind until its normal smooth action is restored.

8.2

Fan housing

2

1

– Remove the fan housing (1)

2

: Fit fan housing (1)

8.3

Pawls

– Remove fan housing, b 8.2

1 4 1 2011RA002 AM

: Prise out segment (1) on the snap fittings (arrows), tip forward and remove

2 1

3

3 2

4 : Remove E-clip (1) and pull pawl (2) with torsion spring (3) upwards and off the bearing journal (4)

– Examine the fan housing and segment, replace if necessary.

– Clean all components – Relieve the tension of the rewind spring, b 8.4

2

: Insert and tighten the screws (2)

: Unscrew the screws (arrows)

Before installing, lubricate the rewind spring and starter post with STIHL special lubricant, b 14.

If clogged with dirt or pitch, the entire starter mechanism, including the rewind spring, must be removed and disassembled. Take particular care when removing the rewind spring, spring can pop out.

1

2011RA004 AM

8.1

2011RA138 AM

Starter

2011RA001 AM

8.

Installation

2

2011RA003 AM

1

: Secure segment (1) with pegs (2) and engage in snap fittings (arrows)

MS 150 C, MS 150 TC

53

8.4

Rope rotor

: Carefully pull off the rope rotor (3) –The rewind spring may pop out

Relieve tension of rewind spring

2011RA139 AM

The system will not be under tension if the starter rope or rewind spring is broken.

– Remove starter rope on the rope rotor, check it and replace if necessary, b 8.5 – Examine the rope rotor and replace it if necessary

– Remove fan housing and segment, b 8.2

– Coat the hole in the rope rotor with STIHL special lubricant, b 14

: Slide off torsion spring in the direction of the arrow, check and replace if necessary

Installation

Installation

1

2011RA140 AM

2

3

: Coat the bearing journal (1) with STIHL multi-purpose grease, b 14 : Push pawl (2) onto bearing journal (1)

2

1

: Pull out the starter rope (1) about 5 cm, then hold the rope rotor (2) steady – Still holding the rope rotor steady, take three full turns off the rope rotor – Pull out the rope with the starter grip and carefully release the rope rotor

: Push torsion spring (3) using a suitable tool beyond the limit stop (arrow)

3

: Fit the rope rotor on the starter post so that the inner loop of the spring (arrow) enters the recess (1) The recess in the hub of the rope rotor acts as carrier for the anchor loop.

1 2

– Tension the rewind spring, b 8.6 2011RA142 AM

: Fit E-clip (4) and engage it in the direction of the arrow

2011RA143 AM

1 4

2011RA141 AM

– Install starter rope on the rope rotor, b 8.5

– Reassemble remaining parts in reverse order

: Loosen screw (1) and carefully remove carrier (2) and spring The rewind spring must be relieved.

54

MS 150 C, MS 150 TC

Starter rope / starter grip

Installation

– Remove the rope rotor, b 8.4

: Make a simple overhand knot in the end of the rope at the starter grip

– Remove fan housing and segment, b 8.2 – Relieve the tension of the rewind spring, b 8.4

2

1 The rewind spring will not be under tension if the starter rope is broken.

2

– Remove any remaining rope from the rope rotor if necessary 2011RA145 AM

1

The starter rope must not be shortened.

3

2011RA148 AM

8.5

: Guide starter rope (1) through the bushing (2), draw into the rope rotor (3)

2011RA409 AM

1

2011RA144 AM

: Prise out cap (1) and push new starter rope (2) sideways into the starter grip

– Pull starter rope out of rope rotor, fan housing and starter grip.

2011RA146 AM

: Unroll starter rope (1) a short distance and undo the knot

: Make the special knot illustrated in the end of the rope – Pull the rope into the rope rotor until the knot rests in the recess (arrow) in the rope rotor.

: Pull the rope out and continue threading it into the starter grip from the top.

– Install the rope rotor and tension the rewind spring, b 8.4 – Remove fan housing and install segment, b 8.2

2011RA147 AM

– Observe the tightening torques, b 2.5

: Pull the rope through the grip until the knot at the end of the rope is in the recess (arrow). : Press the cap into the starter grip.

MS 150 C, MS 150 TC

55

Tensioning the rewind spring

8.7

– Remove fan housing and segment, b 8.2

– Troubleshooting, b 3.4

1 2 2011RA151 AM

– Relieve the tension of the rewind spring, b 8.4

Installation

: Hold the starter grip firmly to keep the starter rope (1) tensioned

2011RA149 AM

2

1

2011RA150 AM

1

2011RA152 AM

The rewind spring is now tensioned.

2

– Relieve the rewind spring if necessary and remove the rope rotor, b 8.4

If the rewind spring no longer produces sufficient tension, it must be replaced. q

Hold the tensioned rope rotor firmly, as the rewind spring will be damaged if it jumps back suddenly.

– Wear face shield and protective gloves – risk of injury

– Remove any fragments of the old spring

: Pull out part of the starter rope (1) : Turn starter rope (1) with rope rotor (2) six times clockwise

The replacement spring is supplied ready for installation and secured in the spring with frame.

– Remove fan housing and segment, b 8.2

: Let go of the rope rotor (2) and let the starter rope rewind slowly

1

Replacing the rewind spring

A worn rewind spring may still be under tension while installed.

The rewind spring is correctly tensioned when the starter grip (1) sits firmly in the rope guide bushing (arrow) without drooping to one side. If this is not the case, the rewind spring must be tensioned by one additional turn.

When the starter rope is fully extended, it must still be possible to rotate the rope rotor at least another full turn before the the max. spring tension is reached. If not, the spring tension must be reduced, otherwise it will break.

: Hold the rope rotor (1) steady

Reduce spring tension

: Pull out the twisted starter rope (2) with the starter grip and straighten it out

Pull the rope out, hold the rope rotor steady and take off one turn of the rope.

1 2

2011RA153 AM

8.6

: Unscrew the screw (1) : Lay a blanket over the assembly area and remove the rewind spring (2) from the fan housing

– Reassemble remaining parts in reverse order

56

MS 150 C, MS 150 TC

Installing new rewind spring

Reinstalling a rewind spring that has popped out

1

Make certain that the rewind spring (1) is inserted completely and the outer anchor loop is seated in the anchor loop mount (arrow), if necessary, press the rewind spring completely into the mount in the fan housing.

: Position replacement spring with frame in the fan housing so that the outer anchor loop (1) is positioned over the mount for the loop (2) and aligns with the mount (arrow)

: Insert anchor loop in the recess (arrow) of the frame

2011RA157 AM

1

2011RA155 AM

: Screw in the screw (1) and tighten it – Install rope rotor, b 8.4 – Tension the rewind spring, b 8.6 : Starting at the outer anchor loop, push the new rewind spring through the openings (arrows) into the mount of the fan housing – in the process, the frame is removed

1

2011RA225 AM

– Lubricate replacement spring with frame with a few drops of STIHL special lubricant before installing it, b 14

2011RA156 AM

2011RA154 AM

1

2

If the rewind spring pops out during installation, fit it in the frame as follows:

– Reassemble remaining parts in reverse order

: Fit the rewind spring (1) in the frame in a circular fashion, working in counterclockwise direction while holding the inserted turns of the spring in place The further course of action is the same as for "Installing a new rewind spring".

8.8

Starter rope guide bushing

Wear on the guide bushing is accelerated by the starter rope being pulled sideways. The wall of the bushing eventually wears through and the bushing becomes loose.

– Remove fan housing and segment, b 8.2 – Relieve the rewind spring if necessary and remove the rope rotor, b 8.4

MS 150 C, MS 150 TC

57

2 1

1

– Use a suitable tool to remove the damaged guide bushing from the fan housing. : Place the new guide bushing (1) in the hole in the fan housing.

2011RA160 AM

2011RA158 AM

3

: Fit the thrust sleeve (1) and hex nut (2). : Tighten down the hex nut, steadying the screw (3), until the bushing is firmly seated.

The installing tool flares the lower end of the rope bushing.

– Remove the installing tool.

– Reassemble remaining parts in reverse order

2011RA159 AM

1

: Insert the screw spindle (1) of the installing tool 0000 890 2150 C through the guide bushing from inside the housing.

58

MS 150 C, MS 150 TC

9.

Antivibration elements

The handle housing and engine housing are connected by vibration damping rubber buffers and a spring.

: Pull ring buffer (2) out of the recess and check it, replace if necessary

Damaged rubber buffers (annular buffers) and springs must be replaced.

MS 150 C

9.1

9.2

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

Rubber buffers

Handlebar / antivibration springs

The spring is located between front handle and engine housing to ensure a strong connection between handle housing and engine housing without transmitting vibrations.

MS 150 TC

The rubber buffer is located between handle housing and engine housing to secure the handle housing without transmitting vibrations.

– Open the handle housing, b 10.5

2011RA053 AM

– Remove the throttle trigger and throttle trigger interlock, b 10.3

– Remove carburetor box cover. b 12.1

– Remove the switch shaft, b 10.1.2

: Remove the screw (arrow)

MS 150 TC – Release chain brake, remove chain sprocket cover, saw chain and guide bar

2011RA051 AM

2

: Remove the screw (arrow)

2011RA055 AM

2011RA054 AM

1

: Remove the screw (arrow)

: Remove screws (1) : Tip ring buffer (2) downward and pull out of the recess, check it and replace if necessary

– Reassemble parts in reverse order – Observe the tightening torques, b 2.5

1

: Remove the screw (arrow) from underneath the engine housing.

2011RA052 AM

2

2011RA056 AM

All versions

: Remove screws (1)

MS 150 C, MS 150 TC

59

– Slide the front handle into the recess on the handle housing, ensuring that the raised parts of the front handle engage the recess of the handle housing.

1

9.3

Both versions

The spring is located between handle housing and engine housing to secure the handle housing without transmitting vibrations. The replacement spring is supplied complete with bearing plug.

3

Antivibration spring of handle housing / engine housing

– Remove chain sprocket cover, bar and chain.

1

2

MS 150 TC – Remove the clutch drum, b 4.2

: Examine the front handle (1), spring (2) and bearing plug (3) and replace if necessary.

MS 150 C

– Observe the tightening torques, b 2.5

: Pull the front handle (1) out of the upper guide (arrow) and remove.

2011RA059 AM

: Draw the front handle out of the engine housing with the spring facing downwards.

– Reassemble remaining parts in reverse order

: Remove the screw (arrow)

2011RA058 AM

: Pull the front handle (1) out of the upper guide (arrow).

2011RA247 AM

2011RA057 AM

1

– Open the handle housing, b 10.5 – Remove the handle molding and actuating levers, b 10.3

Installation

– Remove the switch shaft, b 10.1.2

2011RA056 AM

1

2011RA060 AM

: Unscrew screw (arrow) on the underside of the engine housing and pull bearing plug downwards and out of the handle housing

– Reassemble parts in reverse order

60

2011RA062 AM

Ensure that the spring (1) has been fully turned into the front handle and bearing plug.

: Remove the screw (arrow)

MS 150 C, MS 150 TC

MS 150 C

9.4

Stop buffer of handle housing / engine housing

2011RA274 AM

2011RA064 AM

– Remove the clutch drum, b 4.2

: Remove the screw (arrow)

– Examine the AV spring and replace it if necessary.

The stop buffer is located between handle housing and engine housing and acts as a vibration-damping support of the limit stop on the handle housing.

9.4.1

Stop buffer

MS 150 C only

: Before installing the AV spring, ensure that it has been fully turned into the bearing plugs (arrows).

2

All versions

3

1

2 2

: Carefully pry the stop buffer (1) out of the handle housing (2), check it and replace if necessary

: Prise off the bumper strip (1) with a suitable tool. : Unscrew the screw (2) : Press in the tabs (3) using a screwdriver and remove the cover (4)

3

2011RA065 AM

3

2011RA063 AM

1 4

1 2011RA292 AM

MS 150 TC

: Push AV spring into the recess on the engine housing, make sure that the shrink-on tube (1) of the stop wire and ground wire is in the cable guide (2) and that the cover is secured in the guide groove (3)

9.4.2

Limit stop

– Remove the handle housing, b 10.4

3

– Reassemble parts in reverse order

5

2011RA275 AM

– Observe the tightening torques, b 2.5

– Draw the AV spring (5) out of the recess in the engine housing.

MS 150 C, MS 150 TC

4

2011RA276 AM

All versions

: Unscrew the screw (3) : Remove the limit stop (4), check it and replace if necessary – Reassemble parts in reverse order

61

9.5

Anchor loop (MS 150 TC)

2

2011RA161 AM

1

: Undo the screws (1) : Fold out anchor loop (2), remove in direction of arrow, check it and replace if necessary

62

MS 150 C, MS 150 TC

10.

Actuating levers

10.1

Master Control lever

3

2

2

2011RA185 AM

1

2011RA106 AM

c : Prise off switch shaft (1) on bearing guide (2) and pull out toward the ignition side

The positions are described in the Instruction Manual.

2011RA188 AM

MS 150 C

: Push switch shaft (2) into the counterbearing position (arrow) and turn so that the lever (3) is slightly above the handle housing

1

2

MS 150 TC

2011RA066 AM

The positions are described in the Instruction Manual.

: Push out terminal socket (1) of short circuit wire (2) – Check the switch shaft, replace if necessary

2011RA189 AM

2011RA186 AM

2

: Press switch shaft (2) into the bearing point (arrow) until it engages

Checking operation Installation

10.1.1 Switch shaft MS 150 C

1

– Remove the handle molding, b 10.2

: Press terminal socket (1) into the mount (arrow) as far as it will go

2011RA190 AM

2011RA187 AM

– Remove interlock lever and throttle trigger, b 10.3

: Move switch shaft to switch position "STOP" – the contact between the short circuit wire and the contact spring (arrow) must be closed – Reassemble remaining parts in reverse order

MS 150 C, MS 150 TC

63

10.1.2 Switch shaft MS 150 TC

10.1.3 Double lever MS 150 TC

3

– Remove the handle molding, b 10.3

– Remove filter base, b 12.3

1

2011RA335 AM

– Remove handle molding, b 10.3

3

– Check the switch shaft, replace if necessary

1 2

Installation

3

– Check correct functioning

5

: Set switch shaft in switch position "0", – the contact springs (1) and (2) must rest against the contact pin (arrow) of the switch shaft (3) – Contact is closed

4 1

2011RA192 AM

2

: Press contact springs (1) and (2) slightly to the side – Coat cylindrical pin with STIHL multi-purpose grease – Contact pin and contact springs must be completely grease-free, b 14

1

: Press double lever (1) upwards from the carburetor side and remove from the bearing bore (arrow)

Installation

Throttle trigger and throttle trigger interlock can pop out.

– Reassemble remaining parts in reverse order

1

2

2011RA182 AM

: Guide the switch shaft (1) past the contact springs and pull out – contact springs must not be warped

– Unhook throttle rod from the carburetor, b 10.3.2

2011RA181 AM

– Coat the contact surface between the switch shaft (3) and contact spring (1) with STIHL multipurpose grease, b 14

2011RA223 AM

2011RA191 AM

1

– Remove interlock lever and throttle trigger, b 10.3

: Install the double lever so that the throttle rod (1) can be fitted in the upper hole and the throttle rod (2) on the carburetor in the lower hole (arrow).

: Push switch shaft (3) with cylindrical pin (4) first into the bearing point (arrow) – the mounted contact pin (5) must face the front handle

64

MS 150 C, MS 150 TC

– Reassemble parts in reverse order

2 – Observe the tightening torques, b 2.5

3

3 1

: Pull throttle trigger (1) out of the bearing guides (arrows)

: Align throttle trigger (1) with hook (2) toward the switch shaft, push into the bearing guides (arrows) with the pegs (3) : Press throttle trigger further in direction of arrow and hold in this position

1

: To disassemble the handle molding. press the pegs (1) on the underside apart and through the rear hand guard

1 5 2

: Unhook torsion spring (1) from throttle trigger and remove

4

2011RA168 AM

2011RA162 AM

1

Throttle trigger / trigger interlock MS 150 C

1

2011RA165 AM

10.2

2011RA167 AM

2011RA164 AM

– Check correct functioning

– Examine the individual parts, replace if necessary

– Remove handle molding

: Move switch shaft (4) to lowest position (cold start) until the hook (2) engages in the lever (5) of the switch shaft

Installation

2

: Push in torsion spring (1) and hook into recess in hook (2) – Note the installed position (arrow)

1 2

2011RA169 AM

: Pull trigger interlock (1) out of the bearing points (arrows)

1 2011RA166 AM

1

2011RA163 AM

– Hold switch shaft in this position

: Press end (1) of the torsion spring toward the handle

MS 150 C, MS 150 TC

65

2

Throttle trigger / trigger interlock MS 150 TC

1

2

1

2 : Remove screws (1) 2011RA171 AM

1

: Push handle molding (1) with the tabs (2) under the raised parts (arrows)

2

1

2011RA172 AM

: Press the trigger interlock into the bearing points (arrows) until it clicks into place.

10.3

2011RA175 AM

: Place trigger interlock (2) on bearing points (arrows) and hook torsion spring (1) onto trigger interlock (arrow) – you can now let go of the switch shaft

: Carefully remove handle molding (2) – rod and lever can fall out

: Unhook the torsion spring (1) from the throttle trigger (2) – Examine the individual parts, replace if necessary

Installation

1 1

– Reassemble remaining parts in reverse order

: Pull out throttle rod (1), b 10.3.2

1

2011RA176 AM

– Check correct functioning – When the trigger interlock is not pressed, the throttle trigger must be blocked and when the throttle trigger is not pressed, the switch shaft must be locked towards cold start

2011RA173 AM

– Fit handle molding until it snaps into place

: Push in torsion spring (1) and hook on – Note the installed position (arrow)

2

1

: Remove interlock lever (1) and throttle trigger (2)

4

2

2011RA177 AM

2011RA174 AM

3

: Turn switch shaft (1) so that the throttle trigger (2) can be guided past the cam (3) : Push throttle trigger (2) into the bearing point (arrow) so that the arm (4) of the torsion spring is behind the throttle trigger (2)

66

MS 150 C, MS 150 TC

: Push trigger interlock (1) with hooked in torsion spring into the bore (arrow)

1

10.3.1 Throttle rod MS 150 C – Remove air filter, baffle and filter base, b 12.3

2011RA226 AM

2011RA179 AM

– Install throttle rod, b 10.3.2

: Press throttle rod (1) into the guide (arrow) using a suitable tool until it clicks into place

: Ease throttle rod (1) out of the guide (arrow) on the throttle trigger

: Place handle molding (1) so that the pegs align in the mounts (arrows)

– Check correct functioning – Set throttle trigger to full throttle; the throttle shutter must be open all the way and set the switch shaft to cold start; the choke shutter must be closed

1

2011RA227 AM

: Carefully push on handle molding (1) – throttle trigger and throttle trigger interlock can pop out

: Position throttle rod (1) diagonally, hook into oblong hole on lever and swivel to the right

1

1

1

1

2011RA229 AM

: Hook the trigger interlock (1) onto the torsion spring (2)

– Reassemble remaining parts in reverse order

Installation

2011RA228 AM

– Check correct functioning – When the trigger interlock is not pressed, the throttle trigger must be blocked and when the throttle trigger is not pressed, the switch shaft must be locked towards cold start

2

2011RA178 AM

1

– Reassemble remaining parts in reverse order

2011RA180 AM

: Guide throttle rod (1) to the left under the carburetor, remove, check it and replace if necessary

: Insert and tighten the screws (arrows)

MS 150 C, MS 150 TC

67

10.3.2 Throttle rod MS 150 TC

1 – Remove handle molding, b 10.3

2

2011RA266 AM

: Remove double lever (1)

: Hook throttle rod (arrow) with the right-angled end onto the double lever

– Examine the individual parts, replace if necessary

: Pull throttle rod (1) out of throttle trigger (2) and double lever (3)

Installation

Throttle trigger and throttle trigger interlock can pop out.

1

2011RA353 AM

1

2011RA181 AM

3

2

1

2

2011RA267 AM

2

1

2011RA249 AM

3

: Position the double lever (1) so that it faces towards the carburetor with the bend.

2011RA354 AM

– Remove filter base, b 12.3

: Hook throttle rod (1) into the back oblong hole on the trigger (2) and place connectors (3) on the impulse hose (arrow) – Install the carburetor, b 12.4 : Push the carburetor as far as it will go

: Push the double lever (1) onto the post (2) as far as it will go

– Install filter base, b 12.3

– Remove carburetor (1), b 12.4 : Unhook throttle rod (2)

2

2011RA182 AM

1

: Install the double lever so that the throttle rod (1) can be fitted in the upper hole and the throttle rod (2) on the carburetor in the lower hole (arrow).

68

MS 150 C, MS 150 TC

2

5

1

4

2 3

: Align throttle rod (1) – the arc (2) must be on the throttle trigger (3) : Push throttle rod (1) into double lever and throttle trigger (arrows) Throttle trigger interlock and throttle trigger can pop out.

2011RA366 AM

2011RA355 AM

3

2

– Remove contact spring (1), b 7.9

1

1

2011RA410 AM

1

: Press in tabs (1) with a screwdriver, lift cover (2) and remove sideways

– Remove terminal socket (2) on the switch shaft (3), b 10.1.1 – Remove cable with grommet (4) from the mount (5)

3

Handle housing MS 150 C

– Release chain brake, remove chain sprocket cover, saw chain and guide bar – Remove front handle / antivibration springs, b 9.2 – Remove antivibration spring between handle housing and engine housing, b 9.3

6 2011RA293 AM

10.4

2011RA369 AM

– Install handle molding and check operation, b 10.1.2

: Press out intake elbow (3) in the direction of the cylinder : Examine the intake elbow (3), replace if necessary, b 12.7

– Pry the stop buffer (6) out of the handle housing using a suitable tool, check it and replace if necessary

1 2

– Remove carburetor, b 12.4

2011RA367 AM

3

: Unscrew the screw (arrow) on the ring buffer

MS 150 C, MS 150 TC

2011RA370 AM

– Remove tank vent, b 12.9

: Disengage spacer (1) of fuel hoses (2) on engine housing : Pull angled end of the impulse hose (3) and ends of the fuel hoses from the connectors (arrows)

69

– Check wiring harness and contact spring, reconfigure if necessary, b 7.7

2011RA383 AM

4 5 6 – Remove handle housing (4) downward in handle direction, pull limit stop (5) out of the housing slot (6) for stop buffer and guide cable (7) through opening in housing (8)

– Check switch shaft, reconfigure if necessary, b 10.1.1 – Remove stop buffer, check it and replace if necessary, b 9.4

1

: Press impulse hose (1) downward out of the mount of the handle housing, check it and replace if necessary, b 12.8 : Press fuel hoses (2) back out of the mount of the handle housing, check it and replace if necessary, b 12.10.2 With a new handle housing, check the components of the old handle housing and if necessary, reconfigure to the new handle housing.

– Examine antivibration spring, reconfigure if necessary, b 9.3 – Check front handle, reconfigure if necessary, b 9.2

70

2011RA372 AM

– Coat impulse hose with STIHL press fluid, b 14 : Press impulse hose (1) as far as it will go into the mount (2) so that the circumferential ridge engages in the groove of the impulse hose and so that the straight surface is at the opening (arrow)

– Apply STIHL press fluid to the flange of the intake elbow, b 14 : Place a piece of string around the manifold flange and form a loop

3 2011RA373 AM

2011RA371 AM

2 1

– Coat cast arm of fuel hoses (4) with STIHL press fluid, b 14 : Press fuel hoses (4) into the mount (arrow) of the handle housing so that the circumferential ridge engages in the groove of the cast arm and so that the recess (arrow) rests against the handle housing

Installation

2

4

2011RA374 AM

– Check throttle trigger interlock and throttle trigger, reconfigure if necessary, b 10.2

2011RA375 AM

8 7

The tab (3) of the impulse hose must sit in the recess (arrow) on the housing.

MS 150 C, MS 150 TC

: Push tabs (5) into the mounts of the engine housing until they engage

1 2 1

: Guide cable (2) through the opening of the housing (1) and insert limit stop (3) into housing slot (4)

: Fit cover with the peg (6) on the mount in the engine housing and press down until the pegs (arrows) are seated in the mounts

: Align manifold flange (1) so that the recesses (arrows) rest against the threaded sleeves and the tab (2) is in the recess

2011RA367 AM

3

2011RA378 AM

4

2011RA376 AM

2

1 2 1

: Draw in manifold flange (1) and remove string

3 : Engage spacer (1) of fuel hoses (2) on engine housing

: Push in angled end of the impulse hose (3) and ends of the fuel hoses as far as it will go onto the connectors (arrows)

5

6 2011RA293 AM

â&#x20AC;&#x201C; Guide ends of the string through the bore of the handle housing and fit handle housing on intake elbow

2011RA379 AM

2011RA377 AM

: Screw in screw (arrow) on ring buffer

: Press stop buffer (6) as far as it will go into the recess on the handle housing

5

6 2011RA380 AM

4

: Slide in cover (4) between handle housing and engine housing

MS 150 C, MS 150 TC

71

5

4

– Install front handle / antivibration spring, b 9.2

1

2

1

– Reassemble remaining parts in reverse order

2

: Insert cable with grommet (4) into recess (5) as far as it will go on handle housing

10.5

Handle housing MS 150 TC

2011RA385 AM

2011RA366 AM

3

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

: Install contact spring (1), b 7.9

– Remove antivibration spring of handle housing / engine housing b 9.3

: Push terminal socket (2) as far as it will go into switch shaft (3), b 10.1.1

– Remove carburetor, b 12.4

: Unscrew the screw (2)

2 1

– Remove front handle / antivibration spring, b 9.2

1

– Remove throttle trigger interlock and throttle trigger, b 10.3 – Remove throttle rod with double lever, b 10.3.2 2011RA190 AM

2011RA411 AM

– Remove tank vent, b 12.9

: Check correct functioning

– Remove switch shaft, b 10.1.2

: Move switch shaft to switch position "STOP" – the contact between the short circuit wire and the contact spring (arrow) must be closed

: Press in tabs (1) with a screwdriver, lift cover (2) and remove sideways With a new handle housing, check the components of the old handle housing and if necessary, reconfigure to the new handle housing.

3

– Install antivibration spring between handle housing and engine housing, b 9.3

: Remove contact springs (arrows) from handle housing

2011RA369 AM

– Install carburetor, b 12.4

2011RA208 AM

– Install tank vent, b 12.9

: Press out intake elbow (3) in the direction of the cylinder : Examine the intake elbow (3), replace if necessary, b 12.7

72

MS 150 C, MS 150 TC

– Check wiring harness and contact spring, reconfigure if necessary, b 7.7 – Check throttle trigger interlock and throttle trigger, reconfigure if necessary, b 10.2

6 : Disengage spacer (4) of fuel hoses (5) on engine housing

– Check switch shaft, reconfigure if necessary, b 10.1.1 – Coat cast arm of fuel hoses (4) with STIHL press fluid, b 14

Installation

: Pull angled end of the impulse hose (6) and ends of the fuel hoses from the connectors (arrows)

4

2011RA374 AM

5

2011RA402 AM

: Press fuel hoses (4) into the mount (arrow) of the handle housing so that the circumferential ridge engages in the groove of the cast arm and so that the recess (arrow) rests against the handle housing

1

: Remove handle housing 2011RA372 AM

2

– Coat impulse hose with STIHL press fluid, b 14

: Press impulse hose (1) downward out of the mount of the handle housing, check it and replace if necessary, b 12.8 : Press fuel hoses (2) back out of the mount of the handle housing, check it and replace if necessary, b 12.10.2 With a new handle housing, check the components of the old handle housing and if necessary, reconfigure to the new handle housing.

– Examine antivibration spring, reconfigure if necessary, b 9.3

: Press impulse hose (1) as far as it will go into the mount (2) so that the circumferential ridge engages in the groove of the impulse hose and so that the straight surface is at the opening (arrow)

– Apply STIHL press fluid to the flange of the intake elbow, b 14 : Place a piece of string around the manifold flange and form a loop

3 2011RA373 AM

1

2011RA371 AM

2

2011RA375 AM

4

– Guide ends of the string through the bore of the handle housing and fit handle housing on intake elbow

The tab (3) of the impulse hose must sit in the recess (arrow) on the housing.

– Check front handle, reconfigure if necessary, b 9.2

MS 150 C, MS 150 TC

73

– Install throttle rod with double lever, b 10.3.2 – Remove throttle trigger interlock and throttle trigger, b 10.3

1 2011RA377 AM

– Install tank vent, b 12.9

: Draw in manifold flange (1) and remove string

– Install carburetor, b 12.4 – Install antivibration spring between handle housing and engine housing, b 9.3 – Install front handle / antivibration spring, b 9.2

1

– Reassemble remaining parts in reverse order

2011RA378 AM

2

: Align manifold flange (1) so that the recesses (arrows) rest against the threaded sleeves and the tab (2) is in the recess : Install switch shaft, b 10.1.2 : Check correct functioning

74

MS 150 C, MS 150 TC

11.1

Pickup body

Installation

Very fine dirt particles in the chain oil can clog the pores of the filter. This prevents the oil pump from supplying sufficient oil to the bar and chain. Always check the oil tank and pick-up body first if problems develop in the oil supply.

– Check position of pickup body in the oil tank, if necessary, use assembly hook 5910 893 8800 to clear it – Reassemble remaining parts in reverse order

1

– Troubleshooting, b 3.3

11.2

Oil suction hose

– Unscrew oil tank cap and drain oil tank – Collect lubricant oil in a clean container, b 1

: Push oil suction hose (1) through opening in housing with the pickup body first

11.3

Cast arm for oil pressure

1

2

3

– Push in oil suction hose (1) until the groove is completely aligned in the hole

2011RA233 AM

Chain lubrication

2011RA231 AM

11.

– Remove oil pump, b 11.4 : Release cast arm (1) from the mount (2) with a suitable tool

– Remove oil pump with cast arm, b 11.4

2

– Disconnect cast arm from oil pump

2011RA404 AM

: Push hose (1) completely onto oil suction hose (2)

: Pull oil suction hose (1) off the oil pump (2) and pull out of the engine housing

Installation

– Check oil suction hose, hose (3) and pickup body, replace if necessary

: Push oil suction hose (1) onto connectors (arrow) of oil pump, align so that the markings are congruent

2011RA248 AM

1 1

MS 150 C, MS 150 TC

– Check cast arm, replace if necessary

2011RA239 AM

1 3 2011RA230 AM

2

1

: Push cast arm (1) onto connectors (arrow) of oil pump, align so that the markings are congruent

75

1

2

: Remove oil suction hose (3) with hose (4), check it and replace if necessary, b 11.2

1

2011RA234 AM

2011RA236 AM

: Check oil pump (1), replace if necessary

: Thread cast arm (1) from the back into bushing and press as far as it will go into the mount (2)

: Disconnect worm (1) from the oil pump.

1

– Check worm, replace if necessary

– Install oil pump and slide on worm, b 11.4

1

2

3 Oil pump

2011RA233 AM

– Troubleshooting, b 3.3 – Remove clutch drum, b 4.2 : Release cast arm (1) from the mount (2) with a suitable tool

3 2

: Press in the tabs (3) using a screwdriver and remove the cover (4)

2

2011RA234 AM

2

: Prise off the bumper strip (1) with a suitable tool. : Unscrew the screw (2)

1

1

: Thread cast arm (1) from the back into bushing and press as far as it will go into the mount (2)

4 3

2011RA238 AM

3

: Slide cast arm (1) and oil suction hose (2) onto respective connector (arrows) on oil pump and align so that the markings are congruent

: Unscrew the screw (3)

2011RA235 AM

1

4

2011RA246 AM

2

– Reassemble remaining parts in reverse order

11.4

Installation

: Swivel out oil pump (1) with hose of cast arm (2) : Remove cast arm (2) from pump, check it, replace if necessary, b 11.3

76

MS 150 C, MS 150 TC

1

11.5

2

Valve

Installation

: Align oil pump (1) at bore

– Unscrew oil tank cap and drain oil tank – Collect lubricant oil in a clean container, b 1

1

– Release chain brake, remove chain sprocket cover, saw chain and guide bar

: Screw in the screw (2) and tighten

– Remove clutch drum, b 4.2

1

2011RA244 AM

2011RA240 AM

A valve is installed in the tank wall to keep internal tank pressure equal to atmospheric pressure. The valve must be replaced if faulty.

Ensure that the parts are installed correctly. : Insert new valve (1) into hole (arrow) in crankcase

– Remove cover, b 11.4

1 2011RA245 AM

2011RA241 AM

1

2011RA243 AM

: Push worm (1) onto oil pump

: From the outside, carefully drive the valve (1) out of the case in the direction of the inside of the tank with a Ø 6 mm drift

1

2011RA242 AM

2

: Carefully drive new valve (1) into hole in engine housing from the outside with a Ø 6 mm drift – observe the insertion depth

: Remove old valve (1) from oil tank

– Screw in the screw (2) and tighten – Reassemble remaining parts in reverse order

MS 150 C, MS 150 TC

2011RA408 AM

: Fit cover (1) and press tabs (arrow) into the engine housing until they engage

: Drive new valve into the hole a = ca. 8.5 mm – Reassemble remaining parts in reverse order

77

Air filter

MS 150 TC

Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. The air filter should be checked when there is a noticeable loss of engine power.

1

2 2

– Refer also to Troubleshooting, b 3.6, b 3.7

1 MS 150 C

1

: Turn twist lock (1) counterclockwise

: Remove screws (1)

: Remove carburetor box cover (2)

MS 150 TC

1

1

2011RA074 AM

2

MS 150 C

2011RA078 AM

12.1

2

2011RA077 AM

: Turn twist lock (1) counterclockwise : Remove carburetor box cover (2)

2011RA184 AM

Fuel system

2011RA076 AM

12.

: Remove screws (1)

: Remove air filter (1)

2011RA075 AM

1

: Remove air filter (1) – Check air filter, clean if necessary or replace – see Instruction Manual MS 150 C – Reassemble parts in reverse order

78

– Check air filter, clean if necessary or replace – see Instruction Manual MS 150 TC

All versions

– Reassemble parts in reverse order

– Examine baffle, replace if necessary

12.2

Installation

Baffle

– Remove air filter, b 12.1

: Remove baffle (2)

: Insert first screw and screw in, then insert second screw and tighten both When tightening the screws (1), observe the tightening torque, b 2.5.

– Reassemble parts in reverse order

MS 150 C, MS 150 TC

Filter base

12.4

Carburetor

2

– Remove air filter, b 12.1

– Open filler cap and drain fuel tank

– Remove baffle, b 12.2

– Collect fuel in a clean container, b1

MS 150 C

1 2011RA254 AM

12.3

The carburetor may only be removed when the tank filler cap is open.

: Press rubber grommet (1) on fuel hose down and remove from connector (2)

– Remove filter base, b 12.3

1 All versions 2011RA080 AM

1

: Remove filter base (1)

MS 150 TC : Pull the choke lever (1) off the choke shaft

1

2011RA255 AM

2011RA250 AM

1

: Carefully remove carburetor (1) from impulse hose (arrow)

2011RA079 AM

MS 150 C

1

1

– Coat O-ring on carburetor connector with STIHL press fluid, b 14

2011RA226 AM

Installation All versions : Unhook throttle rod (1) from throttle trigger (arrow) and remove

2

2011RA256 AM

: Remove filter base (1)

: Turn carburetor (1) slightly, disconnect from fuel suction hose (2) and remove

: Push on filter base

– Remove throttle rod

– Install baffle, b 12.2

– Examine the carburetor and repair or replace it if necessary, b 12.5

– Reassemble remaining parts in reverse order

MS 150 C, MS 150 TC

79

MS 150 TC

: Unhook throttle rod and remove carburetor

2

MS 150 TC

– Examine the carburetor and repair or replace it if necessary, b 12.5

1 1

2011RA261 AM

2011RA254 AM

Installation

1

: Hook throttle rod (1) into the back oblong hole (marking T) on the lever

: Carefully remove carburetor (1) from impulse hose (arrow)

The flange (1) must be fully seated in the shaping (arrows) and must not protrude.

1

: Turn carburetor (1) slightly and carefully disconnect from fuel suction hose (2) until the throttle rod makes contact

2

– Push in carburetor until it makes contact with the intake elbow 2011RA260 AM

2011RA258 AM

2

3

: Align carburetor (1) so that the connector (2) faces the impulse hose (arrow) and the connector (3) faces the fuel hose (arrow)

2 1

1

5

Sleeve (1) must be in place.

O-ring (2) must be in place.

– Check components, replace if necessary

4 2011RA263 AM

2011RA257 AM

1

– Coat inside of intake elbow with STIHL press fluid so that the carburetor sleeve is completely plunged into the intake elbow, b 14

All versions

2011RA262 AM

2011RA259 AM

: Press rubber grommet (1) on fuel hose down and remove from connector (2)

: Press rubber grommet (4) down on the fuel hose, insert connector (5), slide rubber grommet over connector 80

MS 150 C, MS 150 TC

MS 150 C

– Check correct functioning – Set throttle trigger to full throttle; the throttle shutter on the carburetor must be open all the way

1

2

1

: Position throttle rod (1) diagonally, hook into oblong hole on lever and swivel to the right

– Reassemble remaining parts in reverse order

1

– Push delivery hose of the pump 0000 850 1300 onto the connector

12.4.1 Leakage test The tank vent must also be checked and replaced if problems develop with the carburetor or fuel supply, b 12.9 The carburetor can be tested for leaks with the pump 0000 850 1300.

1

2011RA229 AM

– Remove the carburetor, b 12.4

2011RA251 AM

2 3

When fitting the choke lever (1) on the choke shaft (2), make sure that the flat side of the choke shaft is lined up with the semi-circular recess in the choke lever, the groove (3) must no longer be visible

MS 150 C, MS 150 TC

If this pressure remains constant, the carburetor is airtight. However, if the pressure drops, this may have the following three causes:

2011RA252 AM

1 2

1

: Push ring (1) to the right and pump air into the carburetor until the pressure gauge (2) shows a pressure of approx.

0.8 bar (80 kPa)

1. The inlet valve is not sealing (foreign objects in the valve seat, sealing cone of the inlet needleis damaged or inlet control lever is sticking), remove to clean, b 12.5.2

: Press throttle rod (1) into the guide (arrow) using a suitable tool until it clicks into place

All versions

2011RA253 AM

2011RA228 AM

– Install filter base, b 12.3

2. Metering diaphragm or gasket is damaged, replace if necessary, b 12.5.1

: Push fuel line (1) 1110 141 8600 onto the connector (2) 0000 855 9200

3. Pump diaphragm or gasket damaged, replace if necessary, b 12.5.3

: Push fuel line with connector onto the connector (arrow)

– After testing, push the ring (1) to the left to vent the pump, then disconnect the fuel line from the connector on the carburetor.

– Install carburetor, b 12.4 – Reassemble remaining parts in reverse order

81

12.5

Repairing the carburetor

12.5.1 Metering diaphragm

– Examine the metering diaphragm for signs of damage and wear, replace the gasket.

1 1

1

– Troubleshooting, b 3.6

1

Installation 2011RA085 AM

– Remove carburetor, b 12.4

2 1 : Fit and tighten screws (1)

2011RA081 AM

2011RA083 AM

1

: Note the order in which the metering diaphragm (2) and gasket (1) are installed

: Check O-ring (arrow) and replace if necessary

: Unscrew the screws (arrows) : Align the gasket (1) and metering diaphragm (2) so that the small holes (arrows) line up with the recess and the small hole on the carburetor

: Remove the end cover (1) If the gasket and diaphragm are stuck to the carburetor, they must be removed very carefully.

12.5.2 Inlet needle – Remove metering diaphragm, b 12.5.1

1

: Carefully separate the metering diaphragm (1) and gasket (2) The diaphragm material is subjected to continuous alternating stresses and eventually shows signs of fatigue. In other words, the diaphragm distorts and swells and must be replaced.

1

2011RA084 AM

2011RA082 AM

1

82

– Reassemble remaining parts in reverse order

: Align the end cover (1) so that the connector (arrow) points towards the choke shutter

2011RA086 AM

2

– Check that the metering diaphragm and gasket are correctly seated, then tighten the screws crosswise

: Unscrew the screw (1)

: Position end cover (1) so that the fixing pin of the end cover engages through the gasket and metering diaphragm into the hole of the carburetor

MS 150 C, MS 150 TC

Installation

2 1

1

12.5.3 Pump diaphragm – Troubleshooting, b 3.6

2

The spring under the inlet control lever may pop out.

2

: Fit the inlet needle (1) : Fit spring (2) in bore

: Unscrew the screw (1)

1 2 3

2

: First fit the spindle (2) of the inlet control lever (3) at the conical seat (arrow) of the spring, then slide the clevis on the inlet control lever into the groove on the inlet needle (1)

: Take out and examine the spring (2), replace if necessary

Ensure that the spring locates on the nipple of the inlet control lever.

: Carefully remove pump diaphragm with gasket

2011RA089 AM

– Press the inlet control lever down and secure it with the screw.

: The sealing cone of the inlet needle must be replaced if a circular indentation (arrow) is visible on its tip.

MS 150 C, MS 150 TC

1

– Check that the inlet control lever moves easily – Install metering diaphragm, b 12.5.1

2

2011RA094 AM

: Pull out the inlet needle (1)

2011RA093 AM

2011RA091 AM

: Remove the end cover (2)

2011RA088 AM

1

1

2011RA092 AM

: Pull the inlet control lever (1) with spindle (2) out of the groove in the inlet needle

2011RA090 AM

2011RA087 AM

– Remove carburetor, b 12.4

: Carefully separate pump diaphragm (1) and gasket (2)

83

The diaphragm material is subjected to continuous alternating stresses and eventually shows signs of fatigue. In other words, the diaphragm distorts and swells and must be replaced.

2011RA099 AM

– Inspect the fuel strainer for contamination and damage, clean or replace it if necessary.

2

2 2011RA097 AM

– Examine the pump diaphragm for signs of damage and wear, replace the gasket.

1 1

: Position pump diaphragm (1) onto gasket so that the protrusions (arrows) match and is secured by the pins (2)

: Move the end cover (1) back and forth slightly until the pegs on the end cover engage in the holes in the carburetor housing

2

– Check that the pump diaphragm and gasket are correctly seated

1

– Reassemble parts in reverse order

1

12.5.4 Adjusting screws

: Position the end cover (1) on the carburetor housing from below so that the gasket and pump diaphragm remain secured to the end cover

2

: Orient the end cover (1) so that the protrusion (arrow) faces the lever of the throttle and choke shaft

Installation

1 3

1

2

2011RA096 AM

2

: Fit new gasket (1) so that the protrusions (arrows) match and are secured in the pins (2)

2011RA100 AM

: Pull the fuel strainer (1) out of the carburetor body with a needle and clean or replace it

– Reassemble remaining parts in reverse order 2011RA098 AM

2011RA095 AM

: Screw in the screw (2) and tighten

There are three adjusting screws on the carburetor: H = High speed adjusting screw (1) L = Low speed adjusting screw (2) LA = Idle speed adjusting screw (3) If the carburetor setting can no longer be adjusted, this may also be due to the adjusting screws.

– Troubleshooting, b 3.6

84

MS 150 C, MS 150 TC

Always fit a new limiter cap.

– Remove carburetor, b 12.4

1

1

2011RA101 AM

1

: Take out the low speed adjusting screw L (1)

2011RA104 AM

2011RA102 AM

Low speed adjusting screw

: Screw puller (1) 5910 890 4502 about five turns into the limiter cap – Left-hand thread

: Examine the tip (arrow) for signs of damage or wear. Fit a new high speed adjusting screw H if necessary.

: Do not turn puller (1) any further – High speed adjusting screw Hcan be damaged

: If the high speed adjusting screw H is OK, remove the old plastic insert (1) – Do not damage high speed adjusting screw H

– Turn the low speed adjusting screw L in as far as possible

High speed adjusting screw

When removing the limiter cap, the plastic insert stays on the high speed adjusting screw H, to remove the old plastic insert, you must remove the high speed adjusting screw H.

1

: Turn the high speed adjusting screw H (1) in as far as possible

Fitting the limiter cap

– Unscrew high speed adjusting screw H Always fit a new limiter cap.

1 2011RA107 AM

The high speed adjusting screw H has a limiter cap which must be removed before removing the screw.

: Pull off limiter cap (1)

2011RA105 AM

: Examine the tip (arrow) for signs of damage or wear. Fit a new low speed adjusting screw L if necessary.

2011RA103 AM

5902RA406 TG

1

: Orient the new limiter cap (1) so that the notch (arrow) points vertically upward

MS 150 C, MS 150 TC

85

: Press the new limiter cap (1) through the hole onto the high speed adjusting screw H until it engages in the first position – Do not press it in all the way

2

1

– Make the basic setting, b 12.6.1

12.6

Carburetor adjustment

12.6.1 Basic setting Only necessary if the high speed adjusting screw H or low speed adjusting screw L has to be replaced or for cleaning and setting the carburetor.

The basic setting must be made after removing the limiter cap.

The carburetor and air filter are installed, the adjusting screws are screwed in and the new limiter cap has been fitted.

2011RA108 AM

The basic setting is realized with the fitted limiter cap using the screwdriver 5910 890 2306.

– Reassemble parts in reverse order

Adjusting screws on disassembled carburetor shown for a better view. : Unscrew high speed adjusting screw H (1) counterclockwise by 2 revolutions out of its seat – Basic setting is set : Unscrew low speed adjusting screw L (2) counterclockwise by 1 revolution out of its seat – Basic setting is set

86

1. Using the idle speed screw LA set speed to 2800 rpm 2. Turn the low speed adjusting screw L left or right to set the highest speed If this speed is more than 3300 rpm, stop the adjustment and start again with step 1.

Setting washer 5910 893 6600 can be fitted on screwdriver 5910 890 2306 to assist in making the setting.

1

4. With the low speed adjusting screw L counterclockwise set the speed to 2800 rpm 5. With the idle speed screw LA set the speed to 3000 rpm 6. With the high speed adjusting screw H set the maximum speed of 12800 rpm – starting from the basic setting

12

14

0

2011RA109 AM

10

– Check the air filter and clean or replace if necessary, b 12.1

Set idle speed with a speed tester.

Set the specified speeds within the tolerance range of ± 200 rpm.

3. With the idle speed screw LA set the speed again to 3300 rpm

– Let the engine warm up

– Check chain tension, adjust if necessary – Examine the spark arresting screen (if installed); clean or replace it if necessary, b 3.7 or b 6.1

Let the engine warm up before starting adjustment. Afterwards, allow the engine to idle for 10 seconds.

: Push screwdriver (1) 5910 890 2306 through the opening (arrow) into the low speed adjusting screw L and high speed adjusting screw H – With the high speed adjusting screw H, push the screwdriver through the fitted limited cap

Once the maximum speed is reached, do not continue to make the mix leaner – the ignition module limits the maximum speed to approx. 12800 rpm.

The permissible maximum speed cannot be increased by continuing to make the mix leaner – making the setting too lean increases the risk of engine damage.

MS 150 C, MS 150 TC

Checking the position of the limiter cap

– Check the air filter and clean or replace if necessary, b 12.1

Standard setting

1

2011RA110 AM

1

The notch (arrow) of the limiter cap (1) must point vertically upward.

2011RA112 AM

– Switch off the engine

Now the basic setting of the high speed adjusting screw H and the low speed adjusting screw L has been established.

The setting of the high speed adjusting screw H is secured if the limiter cap (1) is seated approx. 2 mm inside the carburetor housing.

: If necessary, use a suitable screwdriver to turn the limiter cap (1) counterclockwise as far as it will go – Notch (arrow) is upright

12.6.2 Standard setting Secure the limiter cap

– Carefully turn the high speed adjusting screw H counterclockwise as far as possible, max 3/4 turn – Carefully turn the low speed adjusting screw L clockwise until it is firmly in its seat.

Turn back by one turn Check running behavior: The engine must accelerate well when the throttle is opened and idle smoothly.

Setting the idle speed – Adjust to standard setting – Allow the engine to idle for 10 seconds

1

2011RA111 AM

2011RA113 AM

Engine stops when idling

: Push drift through the opening (arrow) and press in limiter cap until it engages

The limiter cap (1) must not be removed when making the standard setting.

– Set the speed to 3000 rpm with idle speed adjusting screw LA Saw chain rotates at idle speed – Set the speed to 3000 rpm with idle speed adjusting screw LA

To avoid problems, the following steps must be performed for all settings: – Troubleshooting, b 3.6 – Check chain tension, adjust if necessary – Examine the spark arresting screen (if installed); clean or replace it if necessary, b 3.7 or b 6.1

MS 150 C, MS 150 TC

87

Idle setting is too lean.

– Let the engine warm up – Turn the low speed adjusting screw L counterclockwise until the engine runs smoothly and accelerates properly.

The setting of the idle speed screw LA must usually also be adjusted whenever the setting of the low speed adjusting screw L has been corrected.

12.7

Intake elbow

A damaged intake elbow may lead to impaired engine performance.

– Troubleshooting, b 3.6 or b 3.7

2 3 2011RA278 AM

Erratic idling behavior, poor acceleration (despite the standard setting)

– Remove carburetor, b 12.4 – Remove the handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5 For MS 150 TC, the removal and installation steps of the intake elbow are the same as for MS 150 C.

: Unscrew the screws (2), remove intake elbow (3) and check it, replace if necessary – engine operation may be impaired even by the slightest damage, b 3.7 – Turn the flywheel until the piston seals the intake duct

Correcting the carburetor setting for use at high altitudes

1 2011RA277 AM

– Check the standard setting – Let the engine warm up – Turn the high speed adjusting screw H clockwise (leaner), but no further than the stop.

The screws should be adjusted as little as possible. The slightest adjustment produces a tangible difference in engine behavior.

After descending from a high altitude, restore the carburetor setting to the standard setting.

: Prise off cover (1) on the pegs (arrows) and remove via the intake elbow

2011RA279 AM

If the engine does not run satisfactorily, a minor correction may have to be made.

: Examine and clean the mating surfaces (arrows), b 14 The mating surfaces must be in perfect condition and without any damage whatsoever. Parts with damaged mating faces must be replaced.

If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating.

88

MS 150 C, MS 150 TC

Installation

– Reassemble remaining parts in reverse order

12.9

12.9.1 Testing 2011RA283 AM

2011RA280 AM

1

: Push intake elbow with the pegs (arrows) into the rectangular opening of the intake duct and position

: Press cover (1) as far as it will go into the engine housing – the round and oblong pegs (arrows) must be completely pressed in – Install handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5 – Install carburetor, b 12.4

1

2011RA281 AM

– Reassemble remaining parts in reverse order

: Insert and tighten the screws (1)

12.8

Tank vent

Impulse hose

A damaged impulse hose may lead to impaired engine performance.

If problems develop in the carburetor or fuel supply, the tank vent must always also be tested and replaced if necessary. Correct functioning is determined by testing the fuel tank with negative pressure or gauge pressure via the fuel suction hose.

The following preparation work and tests are described for the MS 150 C and can be used in the same way for the MS 150 TC. – Open filler cap and drain fuel tank – Collect fuel in a clean container, b1 – Close the filler cap – Remove carburetor, b 12.4

– Troubleshooting, b 3.6 or b 3.7 – Remove carburetor, b 12.4

2

2011RA282 AM

2

: Align cover (1) so that the holes (arrows) line up with the pegs (2) and go over the intake elbow

– Examine the impulse hose and replace it if necessary,

Installation – Install handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5

2 1 2011RA288 AM

– Remove the handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5

1

: Press tabs (arrow) together and slide fuel pump (1) out of the housing, thereby removing it from the connecting element (2) of the tank vent

– Install carburetor, b 12.4

MS 150 C, MS 150 TC

89

– Clean the area around the tank vent

All versions – Install carburetor, b 12.4

– Replace tank vent if necessary, b 12.9.2

1

– Reassemble remaining parts in reverse order

2011RA412 AM

– Install fuel pump again, b 12.9.2 12.9.2 Tank vent Testing with gauge pressure – Remove carburetor, b 12.4

1

1

2011RA285 AM

Pull stopper (1) out of the fuel suction hose

: Seal fuel hose (1) using a suitable stopper

1

2 1 2011RA288 AM

2011RA286 AM

: Push the connector (1) 0000 855 9200 into the left connection (arrow) on the connecting element

: Press tabs (arrow) together and slide fuel pump (1) out of the housing, thereby removing it from the connecting element (2) of the tank vent

2

2011RA405 AM

2011RA273 AM

Testing with negative pressure

: Slide ring (1) to the left and connect the pump (2) 0000 850 1300 to the double nipple (arrow) – Build up a vacuum in the fuel tank Pressure is equalized via the tank vent. A negative pressure must not build up inside the tank.

90

: Slide ring (1) to the right and connect the pump (2) 0000 850 1300 to the double nipple (arrow) on the fuel hose – Build up gauge pressure in the fuel tank – Actuate the pump until the pressure gauge shows a pressure of 0.5 bar. If this pressure remains constant for at least 20 seconds, the tank and tank vent are airtight. If the pressure drops, the leak must be located and the faulty part replaced.

MS 150 C, MS 150 TC

12.10

Fuel intake

12.10.1 Pickup body

2011RA289 AM

2011RA291 AM

3

: Disconnect connecting element with tank vent (3) from fuel hose

: Align fuel hose so that the lug (arrow) engages in the recess on the handle housing

– Pull tank vent (3) out of connecting element

Impurities which are entrained into the fuel tank with the fuel are trapped by the pickup body. Very fine dirt particles in the fuel can clog the pores of the filter. This reduces the intake diameter and fuel can no longer be delivered in sufficient quantities.

Always check the fuel tank and pickup body first if problems develop in the fuel supply.

– Troubleshooting, b 3.6 or b 3.7

– Examine the tank vent and replace it if necessary,

Clean the fuel tank if necessary.

– Open the filler cap and drain the tank.

2011RA294 AM

Installation

2011RA290 AM

3

: Press fuel pump into the recess until the tabs engage, thereby pressing the connector of the fuel pump as far as it will go into the connecting element – Reassemble remaining parts in reverse order

– Fill a little clean fuel into the tank, close the tank and shake it thoroughly.

– Reopen the tank and empty it – Ensure that the fuel is disposed of correctly and without harming the environment, b 1

: Press tank vent (3) as far as it will go into the connecting element : Push connecting element as far as it will go onto the connectors of the fuel hose

MS 150 C, MS 150 TC

91

– Remove pickup body, b 12.10.1

2

2011RA386 AM

9

2011RA271 AM

1 – Open the filler cap

: Pull the pickup body (1) out of the fuel tank with assembly hook (2) 5910 893 8800 Take care not to overextend the fuel suction hose.

: Pry out end of fuel suction hose (9) using a suitable tool and remove with hose from tank housing, check it and replace if necessary

– Check pickup body (1), replace if necessary

Installation – Fit pickup body, b 12.10.1

– Reassemble parts in reverse order

– Reassemble remaining parts in reverse order 12.10.2 Fuel hoses – Remove handle housing MS 150 C, b 10.4 MS 150 TC, b 10.5 – Remove hose system

2

4

6

7 5 2011RA270 AM

8

: Check elbow connector (4), fuel suction hose (5), fuel return line (6), connecting element (2), hose (7) and connector (8), replace if necessary

92

MS 150 C, MS 150 TC

13.

Special tools

New special tools No.

Designation

Part No.

Use

1

Assembly sleeve

1146 893 4600

2

Assembly sleeve

1146 893 4601

3

Press sleeve

5910 893 1710

4

Screw sleeve

5910 893 2403

5

Screw sleeve

5910 893 2404

Protection of the oil seal (clutch side) Protection of the oil seal (ignition side) Installing oil seal (clutch side / ignition side) Installing crankshaft (ignition side) Installing crankshaft (clutch side)

Remarks

Existing special tools No.

Designation

Part No.

Use

1

Carburetor and crankcase tester

0000 850 1300

2

- Connector - Hose for leakage test Sealing plate

0000 855 9200 1110 141 8600 0000 855 8107

3

Installing tool

0000 890 2201

4 5 6 7 8

Screw sleeve Washer Combination wrench Clamping strap Bit T 20 x 125

5910 890 1800 5910 893 2103 0000 890 3402 0000 893 2600 0812 542 2041

9

Bit T 27 x 125

0812 542 2104

10 11

Wooden assembly block Setting gauge

1108 893 4800 1111 890 6400

12 13 14 15

Assembly drift Assembly tube Locking strip Assembly tool set

1130 893 4700 1117 890 0900 0000 893 5904 5910 007 2201

Testing crankshaft in engine and carburetor for leakage Testing carburetor for leaks Testing carburetor for leaks Testing crankshaft in engine and carburetor for leakage Installation of starter rope guide bushing Assembling/disassembling crankshaft Assembling/disassembling crankshaft Spark plug 1) Tensioning the piston ring Removing and installing spline socket head screws with electric or pneumatic screwdrivers; tightening down screws with torque wrench Removing and installing spline socket head screws with electric or pneumatic screwdrivers; tightening down screws with torque wrench Positioning piston Setting the air gap between ignition module and flywheel Removing and installing piston pins Hook in clutch spring Blocking crankshaft Separating the two crankcase halves (ignition side)

MS 150 C, MS 150 TC

Remarks

93

No.

Designation

Part No.

Use

Remarks

16

5910 850 1650

17 18 19 20

Clamping strip for assembly stand ZAT 4 ignition tester ZAT 3 ignition tester Flange â&#x20AC;&#x201C; inlet side Flange

5910 850 4503 5910 850 4520 5910 850 4203 4224 893 2501

21 22 23 24 25 26 27 28 29

Torque wrench Torque wrench Assembly tool 9 Screwdriver T 20 x 100 Screwdriver T 27 x 150 Screwdriver Screwdriver T 27 x 150 Assembly hook Assembly stand

5910 890 0302 5910 890 0312 5910 890 2209 5910 890 2301 5910 890 2302 5910 890 2306 5910 890 2400 5910 890 2800 5910 890 3101

30 31 32 33 34 35 36

Wiring tool Puller - Claws Puller Stud puller, M8 Stud puller, M8 Socket, SW 13 Setting disk

5910 890 4000 5910 890 4400 0000 890 3700 5910 890 4502 5910 893 0501 5910 890 3000 5910 893 5608 5910 893 6600

37 38

Assembly hook Installing tool

5910 893 8800 5910 893 9600

39 40

Engine analyzer MDG 1 Universal shroud

5910 890 3201

41

Chain without cutters 1/4â&#x20AC;&#x153; P

3114 000 0064

Clamping machine to assembly stand Testing ignition system Testing ignition system Leakage test Sealing the cylinder exhaust port for leakage test Screw connections (1 to 18 Nm) Screw connections (6 to 80 Nm) Fitting hookless snap ring in piston IS screws 1) IS screws 1) Setting the carburetor IS-P screws 1) Detaching springs from clutch shoes Holding chain saw for servicing / repairs Inserting wires in the guides Extracting the oil seal Extracting the oil seal Removing the limiter cap Removing rail mounting studs Inserting repair stud for rail mounting Unscrewing flywheel nut Supplement to screwdriver (carburetor adjustment) Removing pickup body Removing and installing collar nuts on chain sprocket cover Ignition system diagnosis Clutch drum cover during diagnosis with the STIHL MDG 1 engine analyzer Diagnosis with the STIHL MDG 1 engine analyzer

Remarks: 1) Use only for releasing.

94

MS 150 C, MS 150 TC

14.

Service accessories

No.

Designation

Part No.

1

STIHL multi-purpose grease

0781 120 1109

2

Grease (225 g tube)

0781 120 1111

Oil seals, sliding and bearing points

3

STIHL special lubricant

0781 417 1315

Bearing bore in rope rotor, rewind spring in fan housing

4

STIHL press fluid OH 723

0781 957 9000

Rubber elements antivibration elements

5

Standard solvent-based degreasant not containing any chlorinated or halogenated hydrocarbons

MS 150 C, MS 150 TC

Use

Cleaning mating surfaces and the carburetor, cleaning the crankshaft stub and tapers in flywheel

95

96

MS 150 C, MS 150 TC

englisch / english 0455 560 0123. VA0.E12. Printed in Germany