Page 1

331 331E 334

Service Manual 331 - S/N AACS11001 & Above S/N A9K511001 & Above 331E - S/N A9K911001 & Above 334 - S/N A9K711001 & Above

6986943 (2-08)

©Bobcat Company 2008


MAINTENANCE SAFETY WARNING

Instructions are necessary before operating or servicing machine. Read and understand the Operation & Maintenance Manual, Operator’s Handbook and signs (decals) on machine. Follow warnings and instructions in the manuals when making repairs, adjustments or servicing. Check for correct function after adjustments, repairs or service. Untrained operators and failure to follow W-2003-0903 instructions can cause injury or death.

Safety Alert Symbol: This symbol with a warning statement, means: “Warning, be alert! Your safety is involved!” Carefully read the message that follows.

CORRECT

B-10731A

CORRECT

CORRECT

B-19964

B-19959

Never service the Bobcat Compact Excavator without instructions.

Use the correct procedure to lift and support the excavator.

WRONG

WRONG

WRONG

B-19965

B-19960

B-19966

Have good ventilation when welding or grinding painted parts. Wear dust mask when grinding painted parts. Toxic dust and gas can be produced.

Vent exhaust to outside when engine must be run for service. Exhaust system must be tightly sealed. Exhaust fumes can kill without warning.

WRONG

WRONG

B-19962

B-19958

Stop, cool and clean engine of flammable materials before checking fluids. Never service or adjust machine with the engine running unless instructed to do so in the manual. Avoid contact with leaking hydraulic fluid or diesel fuel under pressure. It can penetrate the skin or eyes. Never fill fuel tank with engine running, while smoking, or when near open flame.

Keep body, jewelry and clothing away from moving parts, electrical contact, hot parts and exhaust. Wear eye protection to guard from battery acid, compressed springs, fluids under pressure and flying debris when engines are running or tools are used. Use eye protections approved for type of welding. Keep tailgate closed except for service. Close and latch tailgate before operating the excavator.

Cleaning and maintenance are required daily.

Always lower the bucket and blade to the ground before doing any maintenance. Never modify equipment or add attachments not approved by Bobcat Company.

WRONG

B-19798

Lead-acid batteries produce flammable and explosive gases. Keep arcs, sparks, flames and lighted tobacco away from batteries. Batteries contain acid which burns eyes or skin on contact. Wear protective clothing. If acid contacts body, flush well with water. For eye contact flush well and get immediate medical attention.

Maintenance procedures which are given in the Operation & Maintenance Manual can be performed by the owner/ operator without any specific technical training. Maintenance procedures which are not in the Operation & Maintenance Manual must be performed ONLY BY QUALIFIED BOBCAT SERVICE PERSONNEL. Always use genuine Bobcat replacement parts. The Service Safety Training Course is available from your Bobcat dealer.

MSW28-0805


ALPHABETICAL INDEX AIR CLEANER ........................................................ 60-01 AIR CLEANER SERVICE ....................................... 10-01 AIR CONDITIONING SERVICE.............................. 70-01 AIR CONDITIONING SYSTEM FLOW ................... 70-01 ALTERNATOR ....................................................... 50-01 ARM CYLINDER .................................................... 20-01

FUEL LEVEL SENDER ...........................................50-01 FUEL SYSTEM........................................................10-01 FUEL TANK .............................................................40-01

BASIC TROUBLESHOOTING ................................ 70-01 BATTERY................................................................ 50-01 BLADE ................................................................... 30-01 BLADE CONTROL.................................................. 40-01 BLADE CYLINDER ................................................. 20-01 BOOM ..................................................................... 40-01 BOOM CYLINDER .................................................. 20-01 BOOM SWING CYLINDER..................................... 20-01 BOOM SWING LOCK VALVE ................................. 20-01 BUCKET ................................................................. 40-01 BUCKET CYLINDER .............................................. 20-01

HEATER COIL .........................................................70-01 HEATER A/C FAN ...................................................70-01 HEATER AIR FILTER (WITH CAB OPTION ONLY) .................................10-01 HEATER VALVE ......................................................70-01 HORN .....................................................................40-01 HYDRAULIC CONTROL VALVE .............................20-01 HYDRAULIC CONNECTION SPECS ............... SPEC-01 HYDRAULIC FLUID SPECIFICATIONS............ SPEC-01 HYDRAULIC FILTER MOUNT.................................20-01 HYDRAULIC PUMP ................................................20-01 HYDRAULIC PUMP START UP ..............................20-01 HYDRAULIC RESERVOIR......................................20-01 HYDRAULIC SYSTEM ............................................10-01 HYDRAULIC SYSTEM INFORMATION .................20-01 HYDRAULIC X-CHANGE VALVE ...........................20-01 LEFT CONTROL LEVER (JOYSTICK) ...................20-01 LEFT CONSOLE .....................................................40-01 LIFTING AND BLOCKING THE EXCAVATOR ........10-01 LIFTING THE EXCAVATOR ....................................10-01 LIGHTS....................................................................50-01 LUBRICATION OF THE HYDRAULIC EXCAVATOR ..........................................................10-01

CAB......................................................................... 40-01 CASE DRAIN FILTER ............................................ 20-01 CLAMP CYLINDER ................................................ 20-01 COMPONENTS ..................................................... 70-01 COMPRESSOR ..................................................... 70-01 CONDENSOR ........................................................ 70-01 CONVERSIONS ...............................................SPEC-01 CONTROL PATTERN SELECTOR VALVE ............20-01 CROSS PORT RELIEF VALVES ........................... 20-01 DIAGNOSTICS SERVICE CODES......................... 50-01 DIRECT TO TANK VALVE ...................................... 20-01 DELUXE INSTRUMENT PANEL SETUP................ 50-01 ELECTRICAL SYSTEM INFORMATION ................ 50-01 ENGINE .................................................................. 60-01 ENGINE ACCESSORY DRIVE BELT .................... 10-01 ENGINE COMPONENTS AND TESTING .............. 60-01 ENGINE COOLING SYSTEM ................................. 10-01 ENGINE FLYWHEEL .............................................. 60-01 ENGINE LUBRICATION SYSTEM.......................... 10-01 ENGINE SPECIFICATIONS...............................SPEC-01 ENGINE SPEED CONTROL .................................. 40-01 EXTENDIBLE ARM ................................................ 40-01 EXTENDIBLE ARM CYLINDER ............................. 20-01 EVAPORATOR........................................................ 70-01 EVAPORATOR/HEATER UNIT ............................... 70-01 EXPANSION VALVE ............................................... 70-01 EXTENDIBLE ARM CYLINDER ............................ 20-01 FLOORMAT AND FLOOR PANELS ....................... 40-01 FUEL, COOLANT AND LUBRICANTS .............SPEC-01

GENERAL AIR CONDITIONING SERVICE GUIDELINES ..........................................................70-01

MAGNETIC LOCKOUT SENSOR ...........................50-01 MAIN RELIEF VALVE ..............................................20-01 MANIFOLD ASSEMBLY/ACCUMULATOR .............20-01 OIL COOLER...........................................................20-01 OPERATOR CAB (ROPS/TOPS) ............................10-01 PORT RELIEF VALVES...........................................20-01 PRESSURE REDUCING VALVE.............................20-01 PRESSURE RELIEF VALVE ..................................70-01 PRESSURE SWITCH .............................................70-01 RADIATOR ..............................................................60-01 RECEIVER/DRIER .................................................70-01 RECONDITIONING THE ENGINE .........................60-01 REGULAR MAINTENANCE ...................................70-01 RIGHT CONTROL LEVER (JOYSTICK) .................20-01 RIGHT CONSOLE ...................................................40-01 RIGHT PEDAL AND LINKAGE ...............................40-01 RIGHT SIDE COVER ..................................10-01, 40-01

Continued On Next Page

331/331E/334 Service Manual


ALPHABETICAL INDEX (CONT’D) SAFETY ................................................................. 70-01 SEAT AND MOUNT ................................................40-01 SEAT BELT ............................................................ 10-01 SERVICE SCHEDULE ............................................10-01 SPARK ARRESTOR MUFFLER ...................10-01, 60-01 SPECIFICATIONS ............................................. SPEC-01 STANDARD AND LONG ARM ................................40-01 STARTER ............................................................... 50-01 SWING CIRCLE GEAR ...........................................30-01 SWING FRAME .......................................................40-01 SWING MOTOR .....................................................20-01 SWING MOTOR DRIVE CARRIER..........................20-01 SWIVEL JOINT .......................................................20-01 SYSTEM CHARGING AND RECLAMATION...........70-01 SYSTEM TROUBLESHOOTING CHART................70-01 TAILGATE .....................................................10-01, 40-01 TEMPERATURE/PRESSURE ................................70-01 THERMOSTAT.........................................................70-01 TORQUE SPECIFICATIONS ............................SPEC-01 TRACK DAMAGE IDENTIFICATION.......................30-01 TRACK FRAME ......................................................30-01 TRACK IDLER ........................................................30-01 TRACK ROLLER......................................................30-01 TRACKS ..................................................................30-01 TRANSPORTING THE EXCAVATOR......................10-01 TRAVEL CONTROLS ..............................................40-01 TRAVEL CONTROL VALVE ....................................20-01 TRAVEL MOTOR......................................... 10-01, 20-01 TROUBLESHOOTING.............................................60-01 TWO SPEED SWITCH ............................................50-01 UPPERSTRUCTURE ..............................................40-01 UPPERSTRUCTURE SLEW LOCK ........................10-01 X-CHANGE .............................................................40-01 X-CHANGE (HYDRAULIC)......................................40-01

331/331E/334 Service Manual


SAFETY AND MAINTENANCE

CONTENTS FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

HYDRAULIC SYSTEM

SERIAL NUMBER LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX DELIVERY REPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

UNDERCARRIAGE

BOBCAT EXCAVATOR IDENTIFICATION . . . . . . . . . . . . . . . . . . . . XI SAFETY AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . 10-01 HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-01 UNDERCARRIAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-01 UPPERSTRUCTURE & SWING SECTION . . . . . . . . . . . . . . . . 40-01

UPPERSTRUCTURE & SWING SECTION ELECTRICAL SYSTEM AND ANALYSIS

ELECTRICAL SYSTEM AND ANALYSIS . . . . . . . . . . . . . . . . . . 50-01 ENGINE SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-01

ENGINE SERVICE

HEATING, VENTILATION, AIR CONDITIONING . . . . . . . . . . . . 70-01 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPEC-01

HEATING, VENTILATION, AIR CONDITIONING

SPECIFICATIONS

I

331/ 331E/334 Service Manual


FOREWORD This manual is for the Bobcat Hydraulic Excavator mechanic. It provides necessary servicing and adjustment procedures for the hydraulic excavator and its component parts and systems. Refer to the Operation & Maintenance Manual for operating instructions, starting procedure, daily checks, etc. A general inspection of the following items must be made after the hydraulic excavator has had service or repair:

1. Check that the ROPS/TOPS/ FOPS is in good condition and is not modified.

9. Safety treads must be in good condition.

2. Check that ROPS/TOPS mounting hardware is tightened and is Bobcat approved.

10. Check for correct function of indicator lamps (Optional on some models.

3. The seat belt must be correctly installed, functional and in good condition.

11. Check hydraulic fluid level, engine oil level and fuel supply.

4. Inspect for loose or broken parts or connections.

12. Inspect for fuel, hydraulic fluid leaks.

5. Machine signs must be legible and in the correct location.

13. Lubricate the excavator.

6. Steering levers, control levers and foot pedals must return to neutral. Check that foot pedals lock and control lever locks are in working order.

14. Check the condition of the battery and cables.

7. Inspect the air cleaner for damage or leaks. Check the condition of the element.

Recommend to the owner that all necessary corrections be made before the machine is returned to service.

oil

or

8. Check the electrical charging system.

III

331/ 331E/334 Service Manual


SAFETY INSTRUCTIONS

The following publications provide information on the safe use and maintenance of the Bobcat machine and attachments:

Safety Alert Symbol This symbol with a warning statement means: “Warning, be alert! Your safety is involved!” Carefully read the message that follows.

The Delivery Report is used to assure that complete instructions have been given to the new owner and that the machine is in safe operating condition.

The Operation & Maintenance Manual delivered with the machine or attachment contains operating information as well as routine maintenance and service procedures. It is a part of the machine and can be stored in a container provided on the machine. Replacement Operation & Maintenance Manuals can be ordered from your Bobcat dealer.

Machine signs (decals) instruct on the safe operation and care of your Bobcat machine or attachment. The signs and their locations are shown in the Operation & Maintenance Manual. Replacement signs are available from your Bobcat dealer.

An Operator’s Handbook fastened to the operator cab. It’s brief instructions are convenient to the operator. The handbook is available from your dealer in an English edition or one of many other languages. See your Bobcat dealer for more information on translated versions.

The AEM Safety Manual delivered with the machine gives general safety information.

The Service Manual and Parts Manual are available from your dealer for use by mechanics to do shoptype service and repair work.

The Compact Excavator Operator Training Course is available through your local dealer or at www.training.bobcat.com or www.bobcat.com. This course is intended to provide rules and practices of correct operation of the Bobcat excavator. The course is available in English and Spanish versions.

Service Safety Training Courses are available from your Bobcat dealer or at www.training.bobcat.com or www.bobcat.com. They provide information for safe and correct service procedures.

The Bobcat compact excavator Safety Video is available from your Bobcat dealer or at www.training.bobcat.com or www.bobcat.com.

WARNING Instructions are necessary before operating or servicing machine. Read and understand the Operation & Maintenance Manual, Operator’s Handbook and signs (decals) on machine. Follow warnings and instructions in the manuals when making repairs, adjustments or servicing. Check for correct function after adjustments, repairs or service. Untrained operators and failure to follow instructions can cause injury or death. W-2003-0903

WARNING Warnings on the machine and in the manuals are for your safety. Failure to obey warnings can cause injury or death. W-2044-1285

IMPORTANT This notice identifies procedures which must be followed to avoid damage to the machine. I-2019-0284

SI EXC-1007 SM

V

331/ 331E/334 Service Manual


Hydraulic System

FIRE PREVENTION

Check hydraulic tubes, hoses and fittings for damage and leakage. Never use open flame or bare skin to check for leaks. Hydraulic tubes and hoses must be properly routed and have adequate support and secure clamps. Tighten or replace any parts that show leakage. Maintenance

Always clean fluid spills. Do not use gasoline or diesel fuel for cleaning parts. Use commercial nonflammable solvents.

The machine and some attachments have components that are at high temperatures under normal operating conditions. The primary source of high temperatures is the engine and exhaust system. The electrical system, if damaged or incorrectly maintained, can be a source of arcs or sparks.

Fueling

Flammable debris (leaves, straw, etc.) must be removed regularly. If flammable debris is allowed to accumulate, it can cause a fire hazard. Clean often to avoid this accumulation. Flammable debris in the engine compartment is a potential fire hazard.

Stop the engine and let it cool before adding fuel. No smoking! Do not refuel a machine near open flames or sparks. Fill the fuel tank outdoors.

The operator’s area, engine compartment and engine cooling system must be inspected every day and cleaned if necessary to prevent fire hazards and overheating.

Starting Do not use ether or starting fluids on any engine that has glow plugs. These starting aids can cause explosion and injure you or bystanders.

All fuels, most lubricants and some coolants mixtures are flammable. Flammable fluids that are leaking or spilled onto hot surfaces or onto electrical components can cause a fire.

Use the procedure in the Operation & Maintenance Manual for connecting the battery and for jump starting.

Operation Do not use the machine where exhaust, arcs, sparks or hot components can contact flammable material, explosive dust or gases.

Spark Arrestor Exhaust System The spark arrestor exhaust system is designed to control the emission of hot particles from the engine and exhaust system, but the muffler and the exhaust gases are still hot.

Electrical

Check the spark arrestor exhaust system regularly to make sure it is maintained and working properly. Use the procedure in the Operation & Maintenance Manual for cleaning the spark arrestor muffler (if equipped). Check all electrical wiring and connections for damage. Keep the battery terminals clean and tight. Repair or replace any damaged part or wires that are loose or frayed. Battery gas can explode and cause serious injury. Use the procedure in the Operation & Maintenance Manual for connecting the battery and for jump staring. Do not jump start or charge a frozen or damaged battery. Keep any open flames or sparks away from batteries. Do not smoke in battery charging area. SI EXC-1007 SM

VII

331/ 331E/334 Service Manual


FIRE PREVENTION (CONT’D) Welding And Grinding Always clean the machine and attachment, disconnect the battery, and disconnect the wiring from the Bobcat controllers before welding. Cover rubber hoses, battery and all other flammable parts. Keep a fire extinguisher near the machine when welding. Have good ventilation when grinding or welding painted parts. Wear dust mask when grinding painted parts. Toxic dust or gas can be produced. Dust generated from repairing nonmetallic parts such as hoods, fenders or covers can be flammable or explosive. Repair such components in a well ventilated area away from open flames or sparks. Fire Extinguishers

Know where fire extinguishers and first aid kits are located and how to use them. Inspect the fire extinguisher and service the fire extinguisher regularly. Obey the recommendations on the instructions plate.

SI EXC-1007 SM VIII

331/ 331E/334 Service Manual


SERIAL NUMBER LOCATIONS

Engine Serial Number

Always use the serial number of the excavator when requesting service information or when ordering parts. Early or later models (identification made by serial number) may use different parts, or it may be necessary to use a different procedure in doing a specific service operation.

Figure 2

1

Excavator Serial Number Figure 1

P-49279

Figure 3 1

1

P-49272

The excavator serial number plate (Item 1) is located on the frame of the machine in the location shown [Figure 1]. Explanation of excavator Serial Number: XXXX XXXXX P-49280

Module 2. - Production Sequence (Series) The engine serial number (Item 1) [Figure 2] & [Figure 3] is located on the engine in the locations shown.

Module 1. - Model / Engine Combination 1. The four digit Model/Engine Combination Module number identifies the model number and engine combination. 2. The five digit Production Sequence Number identifies the order which the excavator is produced.

IX

331/ 331E/334 Service Manual


DELIVERY REPORT Figure 4

B-16315

The delivery report must be filled out by the dealer and signed by the owner or operator when the Bobcat Excavator is delivered. An explanation of the form must be given to the owner. Make sure it is filled out completely [Figure 4].

X

331/ 331E/334 Service Manual


BOBCAT EXCAVATOR IDENTIFICATION AUXILIARY QUICK COUPLERS

ARM CYLINDER

OPERATOR’S HANDBOOK

LIFT POINT

OPERATOR SEAT With SEAT BELT

CONTROL LEVERS (JOYSTICKS) BOOM BUCKET CYLINDER

ARM BOOM CYLINDER

BUCKET LINK X-CHANGE ® BLADE CYLINDER TIE DOWNS/ LIFT POINTS

BUCKET

RIGHT SIDE COVER

*CANOPY/CAB (ROPS/TOPS)

TAILGATE

BLADE TRACK FRAME

TRACK TIE DOWN

UPPERSTRUCTURE TRACK

B-19948 B-19949

* FOGS (Falling Object Guards) is available from your Bobcat Excavator dealer.

XI

331/ 331E/334 Service Manual


SAFETY AND MAINTENANCE

SAFETY & MAINTENANCE

AIR CLEANER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-60-1 Daily Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-60-1 Replacing The Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-60-1 ENGINE COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . Checking Coolant Level . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning The Cooling System . . . . . . . . . . . . . . . . . . . . . . Replacing The Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-70-1 10-70-2 10-70-3 10-70-1

ENGINE ACCESSORY DRIVE BELT . . . . . . . . . . . . . . . . . . 10-140-1 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-140-1 Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-140-1 ENGINE LUBRICATION SYSTEM . . . . . . . . . . . . . . . . . . . . . Checking Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing Oil And Filter . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-90-1 10-90-1 10-90-1 10-90-2

FUEL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Draining The Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . Filling The Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing Air From The Fuel System . . . . . . . . . . . . . . . . Removing Water From The Fuel Filter. . . . . . . . . . . . . . . .

10-80-1 10-80-3 10-80-2 10-80-3 10-80-1 10-80-4 10-80-2

HEATER AIR FILTER (WITH CAB OPTION ONLY) . . . . . . . . 10-61-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 10-61-1 HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking And Adding Hydraulic Fluid . . . . . . . . . . . . . . . Diagnostic Couplers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing The Case Drain Filter . . . . . . . . . . . . . . . . . . . Replacing The Hydraulic Filter. . . . . . . . . . . . . . . . . . . . . Replacing The Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . .

10-100-1 10-100-1 10-100-3 10-100-3 10-100-3 10-100-2

LIFTING AND BLOCKING THE EXCAVATOR . . . . . . . . . . . . 10-10-1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10-1 LIFTING THE EXCAVATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12-1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12-1 LUBRICATION OF THE HYDRAULIC EXCAVATOR . . . . . . 10-110-1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-110-1 Continued On Next Page

10-01

331/331E/334 Service Manual


SAFETY AND MAINTENANCE (CONT’D) MOTION ALARM SYSTEM (IF EQUIPPED). . . . . . . . . . . . . 10-160-1 Adjusting Switch Position. . . . . . . . . . . . . . . . . . . . . . . . . 10-160-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-160-1 OPERATOR CAB (ROPS/TOPS) . . . . . . . . . . . . . . . . . . . . . . Cab Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Emergency Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Right Side Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-20-1 10-20-2 10-20-1 10-20-3 10-20-5

RIGHT SIDE COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-41-1 Opening And Closing The Right Side Cover . . . . . . . . . . . 10-41-1 SEAT BELT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-150-1 Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . 10-150-1 SERVICE SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-50-1 Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-50-1 SPARK ARRESTOR MUFFLER . . . . . . . . . . . . . . . . . . . . . . 10-130-1 TAILGATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjusting The Bumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjusting The Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Opening And Closing The Tailgate . . . . . . . . . . . . . . . . . .

10-40-1 10-40-1 10-40-1 10-40-1

TRANSPORTING THE EXCAVATOR . . . . . . . . . . . . . . . . . . . 10-30-1 TRAVEL MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-120-1 Checking Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-120-1 Draining The Travel Motor . . . . . . . . . . . . . . . . . . . . . . . . 10-120-1 UPPERSTRUCTURE SLEW LOCK . . . . . . . . . . . . . . . . . . . . 10-11-1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11-1

10-02

331/331E/334 Service Manual


LIFTING AND BLOCKING THE EXCAVATOR

Figure 10-10-1

Procedure Always park the machine on a level surface.

WARNING AVOID INJURY OR DEATH Instructions are necessary before operating or servicing machine. Read and understand the Operation & Maintenance Manual, Operator’s Handbook and signs (decals) on machine. Follow warnings and instructions in the manuals when making repairs, adjustments or servicing. Check for correct function after adjustments, repairs or service. Untrained operators and failure to follow instructions can cause injury or death. W-2003-0807

1

P-49234

Raise one side of the machine (approximately 4 in.) using the boom and arm [Figure 10-10-1]. Raise the blade fully and install jack stands under the blade and track frame (Item 1) [Figure 10-10-1]. Raise the boom until all machine weight is on the jack stands. Repeat the procedure for the other side.

WARNING

Stop the engine.

Put jackstands under the front axles and rear corners of the frame before running the engine for service. Failure to use jackstands can allow the machine to fall or move and cause injury or death. W-2017-0286

10-10-1

331/ 331E/334 Service Manual


UPPERSTRUCTURE SLEW LOCK Operation

WARNING

Figure 10-11-1

AVOID INJURY The upperstructure slew lock lever must be engaged when transporting the machine. W-2197-0904

1

WARNING AVOID INJURY OR DEATH Never use attachments or buckets which are not approved by Bobcat Company. Buckets and attachments for safe loads of specified densities are approved for each model. Unapproved attachments can cause injury or death.

P-71480A

Move the lever (Item 1) [Figure 10-11-1] up slightly, then to the rear and down to engage the upperstructure slew lock.

W-2052-0907

Figure 10-11-2

1

P-71527A

Move the lever (Item 1) [Figure 10-11-2] up and then forward to disengage the upperstructure slew lock. NOTE: Upperstructure must be in the straight forward or straight rearward position for upperstructure to lock.

10-11-1

331/331E/334 Service Manual


LIFTING THE EXCAVATOR

Figure 10-12-2

Procedure Figure 10-12-1 2 1 1 1 P-49277

Figure 10-12-3 P-49275

Fully extend the cylinders of the bucket, arm, and boom so that the excavator is in the position as shown [Figure 10-12-1]. Raise the blade all the way. 2

Put all the control levers in neutral.

WARNING •

• • •

P-49276

AVOID INJURY OR DEATH Use a lifting fixture with sufficient capacity for the weight of the excavator plus any added attachments. Maintain center of gravity and balance when lifting. Do not swing boom or upperstructure. Engage the upperstructure slew lock. Never lift with operator on machine. W-2202-0607

Fasten chains to the ends of the blade (Item 1) [Figure 10-12-2] and [Figure 10-12-3] and up to a lifting fixture above the canopy/cab. The lifting fixture must extend over the sides of the canopy/cab to prevent the chains from hitting the ROPS/TOPS. Install a 1 in. (25 mm) bolt and nut (Grade 5 or 8) through the holes in the boom (Item 2) [Figure 10-12-1] and [Figure 10-12-3]. Fasten a chain from the bolt to the lift fixture.

10-12-1

331/331E/334 Service Manual


Figure 10-20-3

OPERATOR CAB (ROPS/TOPS) Emergency Exit The left door, front window and right rear window provide exits. Figure 10-20-1

P-49118

Exit through the window [Figure 10-20-3].

1

Figure 10-20-4 P-49176

Pull forward on the latch (Item 1) [Figure 10-20-1]. Figure 10-20-2

P-49127

1

Raise the front window and exit through the window [Figure 10-20-4].

P-49177

Pull the latch/handle (Item 1) [Figure 10-20-2] forward to open the window. Push the handle back to close the window.

10-20-1

331/331E/334 Service Manual


OPERATOR CAB (ROPS/TOPS) (CONT’D) Cab Door Figure 10-20-5

1

P-42570

The cab door (Item 1) [Figure 10-20-5] can be locked with the same key as the starter switch (if equipped). Push the door all the way open until the latch engages to hold the door in the open position. Figure 10-20-6

P-49283

Firmly pull the door away from the cab to disengage the latch and close the door [Figure 10-20-6].

10-20-2

331/331E/334 Service Manual


OPERATOR CAB (ROPS/TOPS) (CONT’D)

Opening The Front Window

Front Window

Figure 10-20-8

Figure 10-20-7

1

1

P-49097 P-49095

Retract the two top window latch pins (Item 1) [Figure 10-20-8]. The front window is equipped with a wiper (Item 1) [Figure 10-20-7] and washer.

Figure 10-20-9

1 P-49098

Turn the two top latches (Item 1) [Figure 10-20-9] to the unlocked position.

10-20-3

331/331E/334 Service Manual


OPERATOR CAB (ROPS/TOPS) (CONT’D)

Closing The Front Window

Front Window (Cont’d)

Support the window while releasing both window latch pins and placing the pins in the unlocked position [Figure 10-20-11].

Opening The Front Window (Cont’d) Figure 10-20-10

Support the window using the left grab handle and pull down on the latch (Item 1) [Figure 10-20-11] to release the window. Use both window grab handles to pull the window down [Figure 10-20-10]. Rotate the top latches (Item 1) [Figure 10-20-9 on Page 10-20-3] to the locked position (Item 1) [Figure 10-20-8 on Page 10-20-3].

P-49127

Use both window grab handles to pull the top of the window in [Figure 10-20-10]. Continue moving the window in and up over the operator’s head until the window is fully raised. Figure 10-20-11

1 2 P-49099

When the window is fully raised, the latch (Item 1) will close on the bracket. Turn the two top latches (Item 2) [Figure 10-20-11] to the locked position.

10-20-4

331/331E/334 Service Manual


OPERATOR CAB (ROPS/TOPS) (CONT’D)

Opening the right front window

Right Side Windows

Figure 10-20-14

Opening the right rear window Figure 10-20-12

1 1

P-49119

Pull back on the latch (Item 1) [Figure 10-20-14]. P-49176

Figure 10-20-15 Pull out on the latch (Item 1) [Figure 10-20-12]. Figure 10-20-13

1

1

P-49120

Pull the latch/handle (Item 1) [Figure 10-20-15] back to open the window.

P-49177

Push the handle forward to close the window. Pull the latch/handle (Item 1) [Figure 10-20-13] forward to open the window. Push the handle back to close the window.

10-20-5

331/331E/334 Service Manual


Figure 10-30-2

TRANSPORTING THE EXCAVATOR When transporting the machine, observe the rules, motor vehicle laws, and vehicle limit ordinances. Use a transport and towing vehicle of adequate length and capacity.

1

Secure the parking brakes and block the wheels of the transport vehicle. Align the ramps with the center of the transport vehicle. Secure the ramps to the truck bed and be sure ramp angle does not exceed 15 degrees. 1

Use metal loading ramps with a slip resistant surface.

P-49274

Use ramps that are the correct length and width and can support the weight of the machine. Figure 10-30-3 The rear of the trailer must be blocked or supported when loading or unloading the excavator to prevent the front of the transport vehicle from raising. Determine the direction of the track movement before moving the machine (blade forward). Engage the slew lock.

1

Figure 10-30-1

P-49101

Fasten chains to the front corners of the blade (Item 1) [Figure 10-30-2] and to the tie down loop at the rear of the track frame (Item 1) [Figure 10-30-3] to prevent it from moving when going up or down slopes or during sudden stops. Use chain binders to tighten the chains and then safely tie the chain binder levers to prevent loosening.

P-49273

Move the machine forward onto the transport vehicle [Figure 10-30-1]. Do not change direction of the machine while it is on the ramps. Lower the boom, arm, bucket, and blade to the transport vehicle. Stop the engine and remove the key (if equipped).

WARNING AVOID SERIOUS INJURY OR DEATH Adequately designed ramps of sufficient strength are needed to support the weight of the machine when loading onto a transport vehicle. Wood ramps can break and cause personal injury. W-2058-0807

Put blocks at the front and rear of the tracks.

10-30-1

331/331E/334 Service Manual


TAILGATE

Adjusting The Bumper

Opening And Closing The Tailgate

Figure 10-40-2

WARNING AVOID INJURY OR DEATH Never service or adjust the machine when the engine is running unless instructed to do so in the manual. W-2012-0497

1

WARNING P-49243

Keep the rear door closed when operating the machine. Failure to do so could seriously injure a bystander. W-2020-1285

The door bumper (Item 1) [Figure 10-40-2] can be adjusted for alignment with the tailgate. Close the tailgate before operating the excavator.

Figure 10-40-1 Adjusting The Latch Figure 10-40-3 1

1 P-49241

Pull the latch (Item 1) [Figure 10-40-1] and open the tailgate. Push firmly to close the tailgate.

P-61104

The door catch (Item 1) [Figure 10-40-3] can be adjusted for alignment.

NOTE: The tailgate can be locked using the start key. Close the tailgate before operating the excavator.

10-40-1

331/331E/334 Service Manual


RIGHT SIDE COVER Opening And Closing The Right Side Cover Figure 10-41-1

1

P-49244

Pull the latch (Item 1) [Figure 10-41-1] and raise the right side cover. NOTE: The right side cover can be locked using the start key.

10-41-1

331/331E/334 Service Manual


SERVICE SCHEDULE

WARNING

Chart Maintenance work must be done at regular intervals. Failure to do so will result in excessive wear and early failures. The service schedule is a guide for correct maintenance of the Bobcat Excavator.

AVOID INJURY OR DEATH Instructions are necessary before operating or servicing machine. Read and understand the Operation & Maintenance Manual, Operator’s Handbook and signs (decals) on machine. Follow warnings and instructions in the manuals when making repairs, adjustments or servicing. Check for correct function after adjustments, repairs or service. Untrained operators and failure to follow instructions can cause injury or death. W-2003-0807

SERVICE SCHEDULE ITEM Engine Coolant Engine Oil Hydraulic Fluid, Hoses and Tubelines, Reservoir Breather Cap Engine Air Filter and Air System Tracks Indicators and Lights Operator Canopy/Cab Seat Belt Safety Signs and Safety Treads Pivot Points Cab Heater Air Filter Console Lockout X-Change ™ Swing Circle and Pinion Fuel Tank & Filter Battery Spark Arrestor Muffler Fuel Filter Travel Motor Drive Belt Radiator, Oil Cooler, *A/C Engine Oil and Filter Primary Hydraulic Filter Case Drain Filter Alternator & Starter Engine Valves Hydraulic System Travel Motor Engine Coolant

* ● ^ ■

SERVICE REQUIRED Check coolant level. Add premixed coolant as needed. Check the engine oil level and add as needed. Check the hydraulic fluid level and add as needed. Check for damage and leaks. Repair or replace as needed. Check condition indicator and empty dust cup as needed. Check air system for leaks. Check and adjust track tension as needed. Check for correct operation of all indicators and lights. Check condition. Check mounting hardware. Check condition. Check mounting hardware. Check for damaged signs (decals) and safety treads. Replace any signs or safety treads that are damaged or worn. Grease all machinery pivot points. Clean the filter as needed. Check console lockout for proper operation. Lubricate and inspect for damage or loose parts. Grease two fittings Drain water and sediment from fuel tank and fuel filter. Check battery, cables, connections and electrolyte level. Add distilled water as needed. Clean the spark chamber. Replace fuel filter. Check oil level in both travel motors. Check and adjust drive belts and idlers. Replace as needed. Clean debris from the radiator fins. Replace oil and filter use CD or better grade oil and Bobcat filter. Replace the primary hydraulic filter and reservoir breather. Replace the case drain filter. Check the alternator and starter connections. Check and adjust the engine valve clearance. Replace the hydraulic fluid and filters. Clean the reservoir. Replace the lubricant in both travel motors. Drain and flush the cooling system. Replace the coolant.

HOURS 8-10

50

100

250

500

■ 1000

● ^ ^

Every 2 years

If Equipped Also at first 50 Hours Also at first 100 Hours Or every 6 months.

10-50-1

331/331E/334 Service Manual


AIR CLEANER SERVICE

Replacing The Filters

See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.)

Outer Filter Release the two fasteners (Item 2) [Figure 10-60-1].

Daily Check Remove and clean the dust cup (Item 3) [Figure 10-601].

Figure 10-60-1

2

3

Figure 10-60-2

1

1

2

P-49245

Check the condition indicator (Item 1) [Figure 10-60-1]. If the red ring shows in the condition indicator, the filter needs to be replaced. Replace the inner filter every third time the outer filter is replaced or as indicated.

P-49246

Pull the outer filter (Item 1) [Figure 10-60-2] from the air cleaner housing. Check the housing for damage. Clean the housing and the seal surface. DO NOT use compressed air. Install a new filter.

10-60-1

331/331E/334 Service Manual


Figure 10-60-4

AIR CLEANER (CONT’D) Replacing The Filters (Cont’d)

1

Figure 10-60-3 3

2

1

P-49247

2

Remove the dust cup, outer filter and inner filter (Item 1) [Figure 10-60-4].

P-49245

Install the dust cup (Item 1) and engage the fasteners (Item 2) [Figure 10-60-3].

NOTE: Make sure all sealing surfaces are free of dirt and debris. Install the new inner filter.

Check the air intake hose and the air cleaner housing for damage. Make sure all connections are tight. Inner Filter

Install the outer filter and the dust cup. Press the button on the condition indicator to remove the red ring.

Only replace the inner filter under the following conditions: •

Replace the inner filter every third time the outer filter is replaced.

After the outer filter has been replaced, press the button (Item 3) [Figure 10-60-3] on the top of the condition indicator and start the engine. Run at full RPM, then reduce engine speed and stop the engine. If the red ring shows in the condition indicator, replace the inner filter.

10-60-2

331/331E/334 Service Manual


Figure 10-61-3

HEATER AIR FILTER (WITH CAB OPTION ONLY) Removal And Installation The heater filter must be cleaned regularly. The filter is located at the left of the operator seat. Figure 10-61-1

1

1

P-42168

2 Installation: Install the filter with the arrows that indicate air flow direction (Item 1) [Figure 10-61-3] pointing towards the heater/AC housing. P-42166

Remove the screw (Item 1) and cover (Item 2) [Figure 10-61-1]. Figure 10-61-2

1

P-42167

Pull the filter (Item 1) [Figure 10-61-2] away and out of the heater/AC housing. Use low air pressure to clean the filter. Replace the filter when very dirty.

10-61-1

331/331E/334 Service Manual


Figure 10-70-3

ENGINE COOLING SYSTEM Replacing The Coolant See the Service Schedule for correct service intervals. (See Chart on Page 10-50-1.)

1

WARNING AVOID BURNS Do not remove radiator cap when the engine is hot. You can be seriously burned. W-2070-1203

P-49270

Figure 10-41-1 Put a hose on the drain valve on the engine block. Open the drain valve (Item 1) [Figure 10-70-3] and drain the coolant into a container. 1 After all the coolant is removed, close both drain valves. Recycle or dispose of the used coolant in an environmentally safe manner. Mix the coolant in a separate container. (See Chart on Page SPEC-60-1.) NOTE: The cooling system is factory filled with propylene glycol (purple color). DO NOT mix propylene glycol with ethylene glycol.

P-49260

When the engine is cool, loosen and remove the radiator cap (Item 1) [Figure 10-41-1].

Add premixed coolant; 47% water and 53% propylene glycol to the recovery tank if the coolant level is low. One gallon and one pint of propylene glycol mixed with one gallon of water is the correct mixture of coolant to provide a -34°F (-37°C) freeze protection.

Figure 10-70-2

Use a refractometer to check the condition of propylene glycol in your cooling system. Add premixed coolant until the level is correct. Run the engine until it is at operating temperature. Stop the engine. Check the coolant level and add as needed. Be sure the radiator cap is tight. 1 Add coolant to the recovery tank as needed. Close the tailgate. P-49259

Put a hose on the drain valve at the bottom of the radiator. Open the drain valve (Item 1) [Figure 10-70-2] and drain the coolant into a container. 10-70-1

331/331E/334 Service Manual


ENGINE COOLING SYSTEM (CONT’D) Checking Coolant Level Check the cooling system every day to prevent overheating, loss of performance or engine damage.

IMPORTANT AVOID ENGINE DAMAGE Always use the correct ratio of water to antifreeze. Too much antifreeze reduces cooling system efficiency and may cause serious premature engine damage.

WARNING AVOID BURNS Do not remove radiator cap when the engine is hot. You can be seriously burned. W-2070-1203

Too little antifreeze reduces the additives which protect the internal engine components; reduces the boiling point and freeze protection of the system. Always add a premixed solution. Adding full strength concentrated coolant can cause serious premature engine damage.

Open the tailgate. Figure 10-70-4

I-2124-0497

WARNING

1

AVOID INJURY OR DEATH Wear safety glasses to prevent eye injury when any of the following conditions exist: • When fluids are under pressure. • Flying debris or loose material is present. • Engine is running. • Tools are being used. W-2019-0907

P-49258

Check the coolant level in the coolant recovery tank (Item 1) [Figure 10-70-4]. The coolant level must be between the MIN and MAX marks on the coolant recovery tank when the engine is cold. NOTE: The cooling system is factory filled with propylene glycol (purple color). DO NOT mix propylene glycol with ethylene glycol.

10-70-2

331/331E/334 Service Manual


ENGINE COOLING SYSTEM (CONT’D) Cleaning The Cooling System NOTE: Allow the cooling system and engine to cool before servicing or cleaning the cooling system. Open the tailgate. Figure 10-70-5

1

P-49257

Use air pressure or water pressure to clean the radiator and oil cooler (Item 1) [Figure 10-70-5]. Do not damage the cooling fins when cleaning.

10-70-3

331/331E/334 Service Manual


FUEL SYSTEM

Biodiesel Blend Fuel

Fuel Specifications

Biodiesel blend fuel has unique qualities that should be considered before using in this machine:

Use only clean, high quality diesel fuel, Grade No. 2 or Grade No. 1. The following is a suggested blending guideline which should prevent fuel gelling problems during freezing temperature Temp. F° (C°)

No. 2

No. 1

Above +15° (-9°) Down to -20° (-29°) Below -20° (-29°)

100% 50% 0%

0% 50% 100%

At a minimum, Low Sulfur (500 ppm sulfur) Diesel Fuel must be used in this machine.

Cold weather conditions can lead to plugged fuel system components and hard starting.

Biodiesel blend fuel is an excellent medium for microbial growth and contamination which can cause corrosion and plugging of fuel system components.

Use of biodiesel blend fuel may result in premature failure of fuel system components, such as plugged fuel filters and deteriorated fuel lines.

Shorter maintenance intervals may be required, such as cleaning the fuel system and replacing fuel filters and fuel lines.

Using biodiesel blended fuels containing more than five percent biodiesel can affect engine life and cause deterioration of hoses, tubelines, injectors, injector pump and seals.

Apply the following guidelines if biodiesel blend fuel is used: •

Ensure the fuel tank is as full as possible at all times to prevent moisture from collecting in the fuel tank.

The following fuels may also be used in this machine: •

Ultra Low Sulfur (15 ppm sulfur) Diesel Fuel.

Ensure that the fuel tank cap is securely tightened.

Biodiesel Blend Fuel - Must contain no more than five percent biodiesel mixed with low sulfur or ultra low sulfur petroleum based diesel. This is commonly marketed as B5 blended diesel fuel.

Biodiesel blend fuel can damage painted surfaces, remove all spilled fuel from painted surfaces immediately.

Drain all water from the fuel filter daily before operating the machine.

Do not exceed engine oil change interval. Extended oil change intervals can cause engine damage.

Before vehicle storage; drain the fuel tank, refill with 100% petroleum diesel fuel, add fuel stabilizer and run the engine for at least 30 minutes.

WARNING Stop and cool the engine before adding fuel. NO SMOKING! Failure to obey warnings can cause an explosion or fire. W-2063-0887

NOTE: Biodiesel blend fuel does not have long term stability and should not be stored for more than three months.

WARNING Always clean up spilled fuel or oil. Keep heat, flames, sparks or lighted tobacco away from fuel and oil. Failure to use care around combustibles can cause explosion or fire which can result in injury or death. W-2103-1285

10-80-1

331/331E/334 Service Manual


FUEL SYSTEM (CONT’D)

Removing Water From The Fuel Filter

Filling The Fuel Tank

Open the tailgate.

Figure 10-80-1

Figure 10-80-2

1

1 P-49248

P-49259

Open the right side cover and remove the fuel fill cap (Item 1) [Figure 10-80-1].

Loosen the drain (Item 1) [Figure 10-80-2] at the bottom of the filter to drain water from the filter.

Use a clean, approved safety container to add fuel. Add fuel only in an area that has a free movement of air and no flames or sparks. NO SMOKING!

See the Service Schedule for the service interval when to remove the water from the fuel filter. (See Chart on Page 10-50-1.)

Install and tighten the fuel fill cap. Clean up any spilled fuel.

WARNING AVOID INJURY OR DEATH Diesel fuel or hydraulic fluid under pressure can penetrate skin or eyes, causing serious injury or death. Fluid leaks under pressure may not be visible. Use a piece of cardboard or wood to find leaks. Do not use your bare hand. Wear safety goggles. If fluid enters skin or eyes, get immediate medical attention from a physician familiar with this injury. W-2072-0807

10-80-2

331/331E/334 Service Manual


FUEL SYSTEM (CONT’D)

Fuel Filter

Draining The Fuel Tank

See the Service Schedule for the service interval when to replace the fuel filter. (See Chart on Page 10-50-1.)

See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.)

Figure 10-80-4

Figure 10-80-3

1 1

P-49249 P-49251

Remove the filter (Item 1) [Figure 10-80-4]. Remove the hose (Item 1) [Figure 10-80-3] from the fuel injection pump. Route the hose to the bottom of the engine compartment and out the tailgate.

Clean the area around the filter housing.

Drain the fuel into a container.

Install the fuel filter, and hand tighten.

Put oil on the seal of the new filter.

Reuse, recycle or dispose of fuel in an environmentally safe manner.

WARNING AVOID INJURY OR DEATH Diesel fuel or hydraulic fluid under pressure can penetrate skin or eyes, causing serious injury or death. Fluid leaks under pressure may not be visible. Use a piece of cardboard or wood to find leaks. Do not use your bare hand. Wear safety goggles. If fluid enters skin or eyes, get immediate medical attention from a physician familiar with this injury. W-2072-0807

10-80-3

331/331E/334 Service Manual


FUEL SYSTEM (CONT’D) Removing Air From The Fuel System After replacing the fuel filter or when the fuel tank has run out of fuel, air must be removed from the fuel system before starting the engine. Figure 10-80-5

3

1

2

P-49251

Open the fuel filter vent (Item 1) and operate the hand pump (priming bulb) (Item 2) [Figure 10-80-5] until the fuel flows from the vent with no air bubbles. Close the vent (Item 1) [Figure 10-80-5]. Start the engine. It may be necessary to open the vent (Item 3) [Figure 10-80-5] (at the fuel injection pump) briefly until the engine runs smoothly.

WARNING AVOID INJURY OR DEATH Diesel fuel or hydraulic fluid under pressure can penetrate skin or eyes, causing serious injury or death. Fluid leaks under pressure may not be visible. Use a piece of cardboard or wood to find leaks. Do not use your bare hand. Wear safety goggles. If fluid enters skin or eyes, get immediate medical attention from a physician familiar with this injury. W-2072-0807

10-80-4

331/331E/334 Service Manual


ENGINE LUBRICATION SYSTEM

Oil Chart

Checking Engine Oil

Figure 10-90-2

Check the engine oil after every 8-10 hours of operation and before starting the engine. Figure 10-90-1

1

P-49252

Open the tailgate and remove the dipstick (Item 1) [Figure 10-90-1]. Keep the oil level between the marks on the dipstick.

Use a good quality motor oil that meets the correct API Service Classification. See oil chart [Figure 10-90-2].

Use a good quality motor oil that meets the correct API Service Classification.

10-90-1

331/331E/334 Service Manual


Figure 10-90-5

ENGINE LUBRICATION SYSTEM (CONT’D) Replacing Oil And Filter See the Service Schedule for the service interval for replacing the engine oil and filter. (See Chart on Page 1050-1.) Run the engine until it is at operating temperature. Stop the engine. Figure 10-90-3

1

P-49255

1

Remove the oil filter (Item 1) [Figure 10-90-5] and clean the filter housing surface. Use a genuine Bobcat replacement filter. Put clean oil on the filter gasket. Install the filter and hand tighten. Install and tighten the oil cap. Figure 10-90-6

P-49253

Remove the drain hose (Item 1) [Figure 10-90-3] from the storage position. 1

Figure 10-90-4

P-49256

Remove the fill cap (Item 1) [Figure 10-90-6]. 1

Put oil in the engine. (See Chart on Page SPEC-60-1.) P-49254

Install the fill cap. Remove the cap (Item 1) [Figure 10-90-4]. Drain the oil into a container. Recycle or dispose of used oil in an environmentally safe manner.

Start the engine and let it run for several minutes. Stop the engine. Check for leaks at the oil filter. Check the oil level. Add oil as needed if it is not at the top mark on the dipstick.

10-90-2

331/331E/334 Service Manual


Figure 10-100-2

HYDRAULIC SYSTEM Checking And Adding Hydraulic Fluid Put the machine on a flat level surface. Retract the arm and bucket cylinders, put the bucket on the ground and lower the blade. Stop the engine. Open the tailgate.

1 Figure 10-100-1

P-49264

2

Check the condition of the fill strainer screen (Item 1) [Figure 10-100-2]. Clean or replace as necessary. Be sure the screen is installed before adding fluid. 1

Add the correct fluid to the reservoir until it is visible in the sight gauge. (See Specifications on Page SPEC-50-1.) Check the cap and clean as necessary. Replace the cap if damaged.

P-61020

Check the hydraulic fluid level, it must be visible in the sight gauge (Item 1) [Figure 10-100-1].

Install the cap. Close the tailgate.

Clean the surface around the reservoir (breather) cap and remove the cap from the reservoir (Item 2) [Figure 10-100-1].

10-100-1

331/331E/334 Service Manual


Figure 10-100-4

HYDRAULIC SYSTEM (CONT’D) Replacing The Hydraulic Fluid See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.)

WARNING AVOID INJURY OR DEATH Diesel fuel or hydraulic fluid under pressure can penetrate skin or eyes, causing serious injury or death. Fluid leaks under pressure may not be visible. Use a piece of cardboard or wood to find leaks. Do not use your bare hand. Wear safety goggles. If fluid enters skin or eyes, get immediate medical attention from a physician familiar with this injury. W-2072-0807

Retract the arm and bucket cylinders, lower the bucket to the ground. Stop the engine. Open the tailgate.

1

P-61107

Open the bleed valve (Item 1) [Figure 10-100-4] on the hydraulic pump. Close the valve after a steady stream of hydraulic fluid free of any air bubbles drains from the valve. Tighten the bleed valve. DO NOT RUN THE MACHINE WITH THE BLEED VALVE OPEN. Start the engine and operate the machine through the hydraulic functions. Stop the engine. Check the fluid level and add as needed.

Figure 10-100-3

1

P-61106

Remove the drain plug (Item 1) [Figure 10-100-3]. Drain the fluid into a container. Recycle or dispose of the fluid in an environmentally safe manner. Install the drain plug (Item 1) [Figure 10-100-3]. Add fluid to the reservoir. (See Specifications on Page SPEC-50-1.)

10-100-2

331/331E/334 Service Manual


HYDRAULIC SYSTEM (CONT’D)

Replacing The Case Drain Filter

Replacing The Hydraulic Filter

Open the right side cover.

See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.)

Remove the filter (Item 2) [Figure 10-100-5]. Clean the housing where the filter gasket makes contact.

Open the right side cover. Put clean hydraulic fluid on the gasket. Install the new filter and hand tighten only.

Figure 10-100-5

Diagnostic Couplers Open the right side cover. Figure 10-100-6

2

1

1

1 P-49266

Remove the hydraulic filter (Item 1) [Figure 10-100-5]. Clean the housing where the filter gasket makes contact.

1 P-58833

Put clean hydraulic fluid on the gasket. Install the new filter and hand tighten only.

Diagnostic couplers (Item 1) [Figure 10-100-6] are located on the hydraulic circuitry.

WARNING

The couplers can be used to check circuit pressures.

AVOID INJURY OR DEATH Always clean up spilled fuel or oil. Keep heat, flames, sparks or lighted tobacco away from fuel and oil. Failure to use care around combustibles can cause explosion or fire which can result in injury or death. W-2103-0807

10-100-3

331/331E/334 Service Manual


Figure 10-110-2

LUBRICATION OF THE HYDRAULIC EXCAVATOR Procedure Lubricate the excavator as specified in the Service Schedule for the best performance of the machine. (See Chart on Page 10-50-1.)

7 5 6

Always use a good quality lithium based multipurpose grease when lubricating the machine. Apply the lubricant until extra grease shows.

6 6

Lubricate the following locations on the excavator EVERY 8-10 HOURS:

8

Figure 10-110-1

5 4

5. Boom Swing Pin (2) [Figure 10-110-2] 6. Boom Swing Pivot (3) [Figure 10-110-2]

1 3

P-21197

7. Boom Pivot (1) [Figure 10-110-2]

3

8. Boom Cylinder Base End (1) [Figure 10-110-2] Figure 10-110-3 2 10

P-21195

Ref Description (# of Fittings) 1. Blade Cylinder Rod End (1) [Figure 10-110-1] 2. Blade Cylinder Base End (1) [Figure 10-110-1] 9

3. Blade Pivots (2) [Figure 10-110-1] 4. Boom Swing Cylinder Rod End (1) [Figure 10-110-1]

P-42463

9. Boom Cylinder Rod End (1) [Figure 10-110-3] 10. Arm Cylinder Base End (1) [Figure 10-110-3]

10-110-1

331/331E/334 Service Manual


LUBRICATION OF THE HYDRAULIC EXCAVATOR (CONT’D)

Figure 10-110-6

Procedure (Cont’d) Figure 10-110-4 11

18

18 17 13

P-19385

12 17. X-Change Latch (1) [Figure 10-110-6] P-42464

11. Arm Cylinder Rod End (1) [Figure 10-110-4]

18. X-Change Pivot Pin (2) [Figure 10-110-6] Figure 10-110-7

12. Arm Pivot (1) [Figure 10-110-4] 13. Bucket Cylinder Base End (1) [Figure 10-110-4] Figure 10-110-5 21

20 19

15

14 16 P-49272

16

19. Boom Swing Cylinder Base End (1) [Figure 10-110-7] Lubricate the following locations on the hydraulic excavator EVERY 50 HOURS:

16 P19384

20. Slew Circle (1) [Figure 10-110-7] 14. Bucket Cylinder Rod End (1) [Figure 10-110-5] 15. Bucket Link Pin (1) [Figure 10-110-5] 16. Bucket Pivot (3) [Figure 10-110-5]

21. Swing Pinion (1) [Figure 10-110-7] (Install 3 - 4 pumps of grease then rotate the upperstructure 90°. Install 3 - 4 pumps of grease and again rotate the upperstructure 90°. Repeat this until the slew pinion has been greased at four positions.)

10-110-2

331/331E/334 Service Manual


LUBRICATION OF THE HYDRAULIC EXCAVATOR (CONT’D) Procedure (Cont’d) Figure 10-110-8 22

22

P-49271

22. Tailgate Hinge (2) [Figure 10-110-8].

10-110-3

331/331E/334 Service Manual


TRAVEL MOTOR

Draining The Travel Motor

Checking Oil Level

See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.)

Figure 10-120-1 Park the excavator on a level surface with plugs (Item 1 & 2) [Figure 10-120-1] in the position shown. Remove both plugs and drain the lubricant into a container.

WARNING

1 2

AVOID INJURY OR DEATH Always clean up spilled fuel or oil. Keep heat, flames, sparks or lighted tobacco away from fuel and oil. Failure to use care around combustibles can cause explosion or fire which can result in injury or death. W-2103-0807

P-49185

Park the excavator on a level surface with the plugs (Items 1 & 2) [Figure 10-120-1] in the position as shown. Remove the plug (Item 1) [Figure 10-120-1]. The lube level must be at the bottom edge of the hole.

Install the bottom plug (Item 2) [Figure 10-120-1]). Add lubricant through the top hole until the lube level is at the bottom edge of the hole. (See Chart on Page SPEC-601.) Install the plug (Item 1) [Figure 10-120-1].

Add lubricant through the hole if the lube level is low. (See Chart on Page SPEC-60-1.)

10-120-1

331/331E/334 Service Manual


SPARK ARRESTOR MUFFLER

Figure 10-130-1

See the Service Schedule for the correct service interval. (See Chart on Page 10-50-1.) Do not operate the excavator with a defective exhaust system.

1

IMPORTANT This excavator is factory equipped with a U.S.D.A. Forestry Service approved spark arrestor muffler. It is necessary to do maintenance on this spark arrestor muffler to keep it in working condition. The spark arrestor muffler must be serviced by dumping the spark chamber every 100 hours of operation. If this machine is operated on flammable forest, brush or grass covered land, it must be equipped with a spark arrestor attached to the exhaust system and maintained in working order. Failure to do so will be in violation of California State Law, Section 4442 PRC. Make reference to local laws and regulations for spark arrestor requirements. I-2061-0195

P-61092

Remove the plug (Item 1) [Figure 10-130-1] from the bottom of the muffler. Start the engine and run for about 10 seconds while a second person, wearing safety glasses, holds a piece of wood over the outlet of the muffler. The carbon deposits will be forced out of the muffler plug hole (Item 1) [Figure 10-130-1]. Stop the engine. Install and tighten the plug. Close the tailgate.

WARNING When the engine is running during service, the steering levers must be in neutral. Failure to do so can cause injury or death. W-2203-0595

Stop the engine. Open the tailgate.

10-130-1

331/331E/334 Service Manual


ENGINE ACCESSORY DRIVE BELT

Belt Adjustment

Belt Tension

Figure 10-140-2

Open the tailgate. Figure 10-140-1 2 1

3 P-49236

Loosen the nut (Item 1) on the belt idler pulley. Loosen the nut (Item 2) and tighten the bolt (Item 3) [Figure 10140-2] until the belt tension is correct.

P-49269

Using a belt tension gauge, measure the belt tension midway between the crankshaft pulley and alternator pulley [Figure 10-140-1].

Tighten the nut (Item 1) to 29 - 37 ft.-lb. (40 - 50 N•m) torque. Tighten the nut (Item 2) [Figure 10-140-2] to 1518 ft.-lb. (20 - 25 N•m) torque.

Belt tension is as follows: New belt 107 - 114 ft.-lb. (145 - 155 N•m) Used belt 92 - 99 ft.-lb. (125 - 134 N•m)

10-140-1

331/331E/334 Service Manual


Figure 10-150-1

SEAT BELT Inspection And Maintenance

WARNING Failure to properly inspect and maintain the seat belt can cause lack of operator restraint resulting in serious injury or death. W-2466-0703

Check the seat belt daily for correct function. Inspect the seat belt system thoroughly yearly or more often if the machine is exposed to severe environmental conditions or applications. The seat belt system should be repaired or replaced if it shows cuts, fraying, extreme or unusual wear, significant discolorations due to ultraviolet (UV) rays from the sun, dusty/dirty conditions, abrasion to the seat belt webbing, or damage to the buckle, latch plate, retractor (if equipped), or hardware. B-22283

The items below are referenced in [Figure 10-150-1]. 1. Check the seat belt webbing. If the system is equipped with a retractor, pull the webbing completely out and inspect the full length of the webbing. look for cuts, wear, fraying, dirt and stiffness. 2. Check the buckle and latch for proper function. Make sure latch plate is not excessively worn, deformed or buckle is not damaged. 3. Check the retractor web storage device (if equipped) by extending the seat belt webbing to determine if it extends and retracts the webbing correctly. 4. Check webbing in areas exposed to ultraviolet (UV) rays from the sun or extreme dust or dirt. If the original color of the webbing in these areas is extremely faded and / or the webbing is packed with dirt, the webbing strength may have weakened. See your Bobcat dealer for approved seat belt system replacement parts for your machine.

10-150-1

331/331E/334 Service Manual


MOTION ALARM SYSTEM (IF EQUIPPED)

Figure 10-160-3

Description This excavator may be equipped with a motion alarm system. The motion alarm will sound when the operator moves the travel control levers in the either the forward or reverse direction

2

Figure 10-160-1

1

1

P-73827

Inspect the motion alarm electrical connections (Item 1) [Figure 10-160-3], wire harness (Item 2) [Figure 10-1603] and motion alarm switches (Item 1) [Figure 10-160-4] for tightness and damage. Repair or replace any damaged components. If the motion alarm switch requires adjustment, see information below.

P-49757

Adjusting Switch Position

Figure 10-160-2

Stop the engine. Remove the floormat and floor plate. (See Service Manual for procedure for floormat and floor plate removal.) 1

Figure 10-160-4 Switch Roller Contacting Bearing

P-49758

2

Inspect for damaged or missing motion alarm decal (Item 1) [Figure 10-160-1] (cab machine) or (Item 1) [Figure 10-160-2] (canopy machine). Replace if required.

3 1 P-61516

Sit in the operator’s seat. Turn excavator key to ON position but do not start the engine. Move the travel control levers (one lever at a time) in the forward direction. The motion alarm must sound. Move the travel control levers (one lever at a time) in the reverse direction. The motion alarm must sound. Turn excavator key to OFF position. The motion alarm is mounted to the bottom rear of the excavator at the louver opening. (The louver must be removed to access the back-up alarm. See the Service Manual for the correct procedure.)

Loosen the screws (Item 2) [Figure 10-160-4] securing the motion alarm switch. Position the motion alarm switch roller (Item 1) so that it makes contact with bearing (Item 3) until it opens the switch circuit. (Listen for the click of the switch.) Torque the screws (Item 2) [Figure 10-160-4] securing the switch to the bracket to 14 - 19 in.-lb. (1,6 - 2,1 N•m).

10-190-1

331/331E/334 Service Manual


HYDRAULIC SYSTEM ARM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20-21-1 20-21-8 20-21-6 20-21-5 20-21-3 20-21-1

BLADE CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20-24-1 20-24-7 20-24-5 20-24-4 20-24-3 20-24-1

HYDRAULIC SYSTEM

BOOM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-10 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-8 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-7 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-4 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1 BOOM SWING CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BOOM SWING LOCK VALVE . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . .

20-22-1 20-22-8 20-22-6 20-22-5 20-22-3 20-22-1

20-170-1 20-170-6 20-170-3 20-170-2 20-170-1

BUCKET CYLINDER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23-11 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23-9 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23-8 Removal And Installation (Extendible Arm) . . . . . . . . . . . . 20-23-5 Removal And Installation (Standard And Long Arm) . . . . . 20-23-3 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23-1 CASE DRAIN FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-1 Continued On Next Page

20-01

331/331E/334 Service Manual


HYDRAULIC SYSTEM (CONT’D) CLAMP CYLINDER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-7 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-4 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26-1 CONTROL PATTERN SELECTOR VALVE . . . . . . . . . . . . . . . . . . . . . 20-100-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-100-4 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-100-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-100-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-100-1 CROSSPORT RELIEF VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-32-1 Testing And Adjusting The Crossport Relief Valves . . . . . . . . . . . . . 20-32-1 DIRECT TO TANK VALVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-1 EXTENDIBLE ARM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-6 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-4 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-1 HYDRAULIC CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1 Arm Valve Section Disassembly And Assembly . . . . . . . . . . . . . . 20-40-43 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-63 Auxiliary Valve Section Disassembly And Assembly . . . . . . . . . . . 20-40-33 Blade Valve Section Disassembly And Assembly . . . . . . . . . . . . . 20-40-19 Boom Swing Valve Section Disassembly And Assembly. . . . . . . . 20-40-53 Boom Valve Section Disassembly And Assembly . . . . . . . . . . . . . 20-40-48 Bucket Valve Section Disassembly And Assembly . . . . . . . . . . . . 20-40-38 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-9 Inlet Section Disassembly And Assembly . . . . . . . . . . . . . . . . . . . 20-40-58 Left Travel Valve Section Disassembly And Assembly . . . . . . . . . 20-40-15 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-8 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-2 Right Travel Valve Section Disassembly And Assembly . . . . . . . . 20-40-11 Slew Valve Section Disassembly And Assembly . . . . . . . . . . . . . . 20-40-28 Continued On Next Page

20-02

331/331E/334 Service Manual


HYDRAULIC SYSTEM (CONT’D) HYDRAULIC FILTER MOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-120-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-120-1 HYDRAULIC PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-18 Coupler Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-10 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-9 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-6 Testing Auxiliary Hydraulic Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-5 Testing The Piston Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-3 Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-2 HYDRAULIC RESERVOIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-130-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-130-1 HYDRAULIC SYSTEM INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . 20-10-1 Glossary Of Hydraulic/Hydrostatic Symbols For Excavators . . . . . . 20-10-1 Troubleshooting The Cylinder Circuit. . . . . . . . . . . . . . . . . . . . . . . . 20-10-5 Troubleshooting The Hydraulic Circuit . . . . . . . . . . . . . . . . . . . . . . . 20-10-4 Troubleshooting The Swing (Upperstructure Slew) Circuit . . . . . . . 20-10-6 Troubleshooting The Travel Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-7 HYDRAULIC X-CHANGE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-14 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-1 LEFT CONTROL LEVER (JOYSTICK) . . . . . . . . . . . . . . . . . . . . . . . . 20-111-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-13 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-8 Handle Removal And Installation. . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-2 Joystick Assembly Removal And Installation. . . . . . . . . . . . . . . . . 20-111-5 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-7 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-1 MAIN RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-1 Testing And Adjusting The Main Relief Valve . . . . . . . . . . . . . . . . . 20-30-1 Continued On Next Page

20-03

331/331E/334 Service Manual


HYDRAULIC SYSTEM (CONT’D) MANIFOLD ASSEMBLY/ ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . 20-60-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-5 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-4 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1 OIL COOLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-140-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-140-1 PORT RELIEF VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31-1 Testing And Adjusting Port Relief Valve Pressure . . . . . . . . . . . . . . 20-31-1 PRESSURE REDUCING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-33-1 Testing And Adjusting The Pressure Reducing Valve . . . . . . . . . . . 20-33-1 RIGHT CONTROL LEVER (JOYSTICK). . . . . . . . . . . . . . . . . . . . . . . 20-110-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-15 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-10 Handle Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-2 Joystick Assembly Removal And Installation . . . . . . . . . . . . . . . . . 20-110-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-9 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-1 SWING MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-10 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-5 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-4 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-1 SWING MOTOR DRIVE CARRIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-5 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-1 SWIVEL JOINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-1 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-4 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-1 Continued On Next Page

20-04

331/331E/334 Service Manual


HYDRAULIC SYSTEM (CONT’D) TRAVEL CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-2 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-1 TRAVEL MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-13 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-1

20-05

331/331E/334 Service Manual


Thank you very much for your reading. Please Click Here Then Get More Information.

Bobcat 331 compact excavator service repair manual sn aacs11001 & above  
Bobcat 331 compact excavator service repair manual sn aacs11001 & above  
Advertisement