Page 1

337 341

Service Manual 337 - S/N 234611001 & Above 341 - S/N 234711001 & Above (G Series)

6902741 (11-07)

Printed in U.S.A.

ŠBobcat Company 2007


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 ............................................. 10-01, 60-01 AIR CONDITIONING SERVICE.............................. 70-01 AIR CONDITIONING SYSTEM FLOW ................... 70-01 ALTERNATOR ....................................................... 50-01 ARM ....................................................................... 40-01 ARM CYLINDER .................................................... 20-01 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 BUILD UP VALVE ................................................... 20-01 CAB......................................................................... 40-01 CASE DRAIN FILTER MOUNT............................... 20-01 CLAMP CYLINDER ............................................... 20-01 COMPONENTS ...................................................... 70-01 COMPRESSOR ...................................................... 70-01 CONDENSOR......................................................... 70-01 CONTROL LINKAGE ASSEMBLY.......................... 40-01 CONTROL PATTERN SELECTOR VALVE............. 20-01 CONVERSIONS ...............................................SPEC-01 COOLING SYSTEM................................................ 10-01 CROSSPORT RELIEF VALVE................................ 20-01 DELUXE INSTRUMENT PANEL SETUP................ 50-01 DIAGNOSTICS SERVICE CODE ........................... 50-01 DIRECT TO TANK VALVE ...................................... 20-01 DUAL SEQUENCE VALVE ..................................... 20-01 ELECTRICAL SYSTEM INFORMATION ................ 50-01 ENGINE .................................................................. 60-01 ENGINE ACCESSORY DRIVE BELT ..................... 10-01 ENGINE COMPONENTS AND TESTING .............. 60-01 ENGINE FLYWHEEL .............................................. 60-01 ENGINE LUBRICATION SYSTEM.......................... 10-01 ENGINE SPECIFICATIONS...............................SPEC-01 ENGINE SPEED CONTROL .................................. 40-01 EVAPORATOR........................................................ 70-01

EVAPORATOR/HEATER UNIT................................70-01 EXPANSION VALVE ................................................70-01 FLOORMAT AND FLOOR PLATE...........................40-01 FUEL, COOLANT AND LUBRICANTS ............. SPEC-01 FUEL LEVEL SENDER ...........................................50-01 FUEL SYSTEM........................................................10-01 FUEL TANK .............................................................40-01 GENERAL AIR CONDITIONING SERVICE GUIDELINES ...........................................................70-01 HEATER/AC FAN ....................................................70-01 HEATER AIR FILTER .............................................10-01 HEATER COIL .........................................................70-01 HEATER VALVE ......................................................70-01 HORN .....................................................................40-01 HYDRAULIC CONNECTION SPECIFICATIONS... SPEC-01 HYDRAULIC CONTROL VALVE .............................20-01 HYDRAULIC FILTER MOUNT.................................20-01 HYDRAULIC FLUID SPECIFICATIONS............ SPEC-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 CONSOLE .....................................................40-01 LEFT CONTROL LEVER (JOYSTICK) ...................20-01 LIFTING AND BLOCKING THE EXCAVATOR ........10-01 LIFTING THE EXCAVATOR ....................................10-01 LIGHTS....................................................................50-01 LUBRICATION OF THE EXCAVATOR ....................10-01 MAIN RELIEF VALVE ..............................................20-01 MANIFOLD ASSEMBLY/ACCUMULATOR .............20-01 MUFFLER................................................................60-01 OIL COOLER...........................................................20-01 OPERATOR CAB ....................................................10-01 PORT RELIEF VALVES...........................................20-01 PRESSURE REDUCING VALVE.............................20-01 PRESSURE RELIEF VALVE ...................................70-01 PRESSURE SWITCH..............................................70-01

Continued On Next Page

337/341 Excavator Service Manual


ALPHABETICAL INDEX (CONT’D) RADIATOR...............................................................60-01 RECEIVER/DRYER.................................................70-01 RECONDITIONING THE ENGINE .........................60-01 REGULAR MAINTENANCE ....................................70-01 REMOVING AIR FROM HYDRAULIC SYSTEM .....20-01 RIGHT CONSOLE ...................................................40-01 RIGHT CONTROL LEVER (JOYSTICK) .................20-01 RIGHT PEDAL AND LINKAGE................................40-01 RIGHT SIDE COVER ..............................................10-01 ROPS CANOPY.......................................................40-01 SAFETY...................................................................70-01 SEAT AND SEAT MOUNT ......................................40-01 SEAT BELT ..............................................................10-01 SERVICE SCHEDULE ............................................10-01 SPARK ARRESTOR MUFFLER .............................10-01 SPECIFICATIONS ............................................. SPEC-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 X-CHANGE ............................................................ 40-01 X-CHANGE (HYDRAULIC) .................................... 40-01

337/341 Excavator 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

HVAC

SPECIFICATIONS

I

337/341 Excavator Service Manual


FOREWORD This manual is for the Bobcat Excavator mechanic. It provides necessary servicing and adjustment procedures for the 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 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 filters.

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

8. Check the electrical charging system.

oil

or

CALIFORNIA PROPOSITION 65 WARNING Diesel engine exhaust and some of its constituents are know to the state of California to cause cancer, birth defects and other reproductive harm.

III

337/341 Excavator 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

337/341 Excavator Service Manual


SAFETY INSTRUCTIONS (CONT’D) The dealer and owner / operator review the recommended uses of the product when delivered. If the owner / operator will be using the machine for a different application(s) he or she must ask the dealer for recommendations on the new use.

Cutting or drilling concrete containing sand or rock containing quartz may result in exposure to silica dust. Do not exceed Permissible Exposure Limits (PEL) to silica dust as determined by OSHA or other job site Rules and Regulations. Use a respirator, water spray or other means to control dust. Silica dust can cause lung disease and is known to the state of California to cause cancer.

Call Before You Dig Dial 811 (USA Only) 1-888-258-0808 (USA & Canada) When you call, you will be directed to a location in your state / province, or city for information about buried lines (telephone, cable TV, water, sewer, gas, etc.).

SI EXC-1007 SM

VI

337/341 Excavator Service Manual


FIRE PREVENTION

Hydraulic System 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

337/341 Excavator 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

337/341 Excavator 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

Excavator Serial Number Figure 1 1

P-49091

Figure 3

1

P-49090

The excavator serial number plate (Item 1) [Figure 1] is located on the frame of the machine in the location shown.

1

Explanation of Excavator Serial Number: XXXX XXXXX P-49092

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

Module 1. - Model/ Engine Combination 1. The 4 digit Model/Engine Combination Module number identifies the model number and engine combination. 2. The 5 digit Production Sequence Number identifies the order which the excavator is produced.

IX

337/341 Excavator 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

337/341 Excavator Service Manual


BOBCAT EXCAVATOR IDENTIFICATION

LIFT POINT

ARM CYLINDER

OPERATOR’S HANDBOOK

AUXILIARY QUICK COUPLERS

OPERATOR SEAT With SEAT BELT

BUCKET CYLINDER

CONTROL LEVERS (JOYSTICKS)

BOOM

ARM BUCKET LINK

X-CHANGE

BOOM CYLINDER BLADE CYLINDERS

TIE DOWNS/ LIFT POINTS

BUCKET

*CANOPY/CAB (ROPS/TOPS)

RIGHT SIDE COVER

BLADE TAILGATE TRACK FRAME TRACK

TIE DOWN TRACK

UPPERSTRUCTURE

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

XI

B19945 B19947

337/341 Excavator Service Manual


SAFETY AND MAINTENANCE

SAFETY AND MAINTENANCE

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

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

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

HEATER AIR FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-61-1 Fresh Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-61-1 HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking And Adding Hydraulic Oil . . . . . . . . . . . . . . . . . Diagnostic Couplers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing The Case Drain Filter . . . . . . . . . . . . . . . . . . . Replacing The Hydraulic Filter. . . . . . . . . . . . . . . . . . . . . Replacing The Hydraulic Oil . . . . . . . . . . . . . . . . . . . . . .

10-100-1 10-100-1 10-100-4 10-100-3 10-100-3 10-100-2

LIFTING AND BLOCKING THE EXCAVATOR . . . . . . . . . . . . 10-10-1 LIFTING THE EXCAVATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11-1 LUBRICATION OF THE EXCAVATOR . . . . . . . . . . . . . . . . . 10-110-1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-110-1 Continued On Next Page

337/341 Excavator 10-01


SAFETY AND MAINTENANCE (CONT’D) OPERATOR CAB (ROPS/TOPS) . . . . . . . . . . . . . . . . . . . . . . 10-20-1 Cab Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20-2 Emergency Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20-1 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

337/341 Excavator 10-02


LIFTING AND BLOCKING THE EXCAVATOR

Figure 10-10-2

WARNING Put jackstands under the blade and rear corners of the undercarriage before working under the machine. Failure to block up the machine may allow it to move or fall and result in injury or death. W-2218-1195

WARNING

P11367

AVOID INJURY Keep fingers and hands out of pinch points when checking the track tension. W-2142-0903

Fully raise the blade and install jackstands under the blade [Figure 10-10-1] and track frame [Figure 10-10-2]. Raise the boom until all the machine weight is on the jackstands.

Figure 10-10-1 Repeat the procedure for the other side. Stop the engine.

P11368

Raise the machine using the boom and arm [Figure 1010-1].

10-10-1

337/341 Excavator Service Manual


LIFTING THE EXCAVATOR

Figure 10-11-2

Figure 10-11-1

2 1

1

1

P-49277 P-49186

Figure 10-11-3 Fully extend the cylinders of the bucket, arm & boom so that the Excavator is in the position as shown [Figure 1011-1]. Raise the blade all the way.

2

Put all the control levers in neutral.

WARNING •

• • •

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. En gage the swing locking lever. Never lift with operator on machine. W-2202-0595

N-23184

Fasten chains to the ends of the blade (Item 1) [Figure 10-11-1] & [Figure 10-11-2] 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 inch (25mm) bolt and nut (Grade 5 or 8) through the holes at the top of the boom (Item 2) [Figure 10-11-1] & [Figure 10-11-3]. Fasten a chain from the bolt to the lift fixture.

10-11-1

337/341 Excavator Service Manual


OPERATOR CAB (ROPS/TOPS)

Figure 10-20-3

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

337/341 Excavator 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). Figure 10-20-6

P-49096

Push the door all the way open until the latch engages to hold the door in the open position. Firmly pull the door away from the cab to disengage the latch and close the door [Figure 10-20-6].

10-20-2

337/341 Excavator Service Manual


TRANSPORTING THE EXCAVATOR

Figure 10-30-2

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). 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. P-49103

Use chain binders to tighten the chains and then safely tie the chain binder levers to prevent loosening.

Move the machine forward onto the transport vehicle [Figure 10-30-1].

WARNING

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).

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-2058-0494

Put blocks at the front and rear of the tracks.

10-30-1

337/341 Excavator 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-49180

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-49154

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

P-49153

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

337/341 Excavator Service Manual


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

1

P-16613

Pull the latch up (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

337/341 Excavator 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.

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

SERVICE SCHEDULE SERVICE REQUIRED

ITEM Engine Coolant

Check coolant level. Add premixed coolant as needed.

Engine Oil

Check the engine oil level and add as needed.

HOURS 8-10

50

100

250

500

■ 1000

Hydraulic Fluid, Hoses and Check the hydraulic fluid level and add as needed. Check for damage and Tubelines, Reservoir Breather Cap leaks. Repair or replace as needed. Check condition indicator and empty dust cup as needed. Check air system Engine Air Filter and Air System for leaks. Tracks Check and adjust track tension as needed. Indicators and Lights

Check for correct operation of all indicators and lights.

Operator Canopy/Cab

Check condition. Check mounting hardware.

Seat Belt

Check condition. Check mounting hardware.

Safety Signs and Safety Treads

Check for damaged signs (decals) and safety treads. Replace any signs or safety treads that are damaged or worn. Grease all machinery pivot points.

Pivot Points Cab Heater Air Filter

Clean the filter as needed.

Console Lockout

Check console lockout for proper operation. Repair or replace as needed.

X-Change ™

Lubricate and inspect for damage or loose parts.

Swing Circle and Pinion

Grease two fittings.

Fuel Tank & Filter

Drain water and sediment from fuel tank and fuel filter.

Battery

Check battery, cables, connections and electrolyte level. Add distilled water as needed. Check condition of belt and adjust as needed.

Accessory Drive Belt

Spark Arrestor Muffler

Clean the spark chamber.

Fuel Filter

Replace fuel filter.

Travel Motor

Check the oil level in both travel motors

Radiator, Oil Cooler, *A/C

Clean debris from the radiator fins.

Engine Oil and Filter

Replace oil and filter use CD or better grade oil and Bobcat filter.

Primary Hydraulic Filter

Replace the primary hydraulic filter.

^

Case Drain Filter

Replace the case drain filter.

^

Alternator & Starter

Check the alternator and starter connections.

Engine Valves

Check and adjust the engine valve clearance.

Engine Cooling System

Drain and flush the cooling system. Replace the coolant.

Hydraulic System

Replace the hydraulic fluid and filters. Clean the reservoir.

Travel Motor

Replace the oil in both travel motors.

* ● ^ ■

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

10-50-1

337/341 Excavator Service Manual


AIR CLEANER

Replacing The Filters

Checking

Outer Filter

See SERVICE SCHEDULE on Page 10-50-1 for the correct service interval.

Pull out on the locking tab (Item 2) [Figure 10-60-1].

Figure 10-60-1

Remove and clean the dust cup (Item 3) [Figure 10-601]. 1

Figure 10-60-2

2

3 1

N-23145 N-23143

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.

N-23144

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

337/341 Excavator Service Manual


AIR CLEANER (CONT’D)

Figure 10-60-4

Replacing The Filters (Cont’d) Outer Filter (Cont’d) Figure 10-60-3 1 3 2

1 N-23145

Remove the dust cup, outer filter and inner filter (Item 1) [Figure 10-60-4]. NOTE: Make sure all sealing surfaces are free of dirt and debris.

P-23143

Install the dust cup (Item 1) [Figure 10-60-3] and turn 1/8 turn.

Install the new inner filter. Install the outer filter and the dust cup.

Push the locking tab in (Item 2) [Figure 10-60-3]. Check the air intake hose and the air cleaner housing for damage. Make sure all connections are tight.

Press the button on the condition indicator to remove the red ring.

Inner Filter 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

337/341 Excavator Service Schecule


HEATER AIR FILTER

Figure 10-61-3

Fresh Air Filter Figure 10-61-1

1

1 2 P-42168

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

The heater filter must be cleaned regularly. The filter is located at the left of the operator seat [Figure 10-61-1]. 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 when very dirty.

10-61-1

337/341 Excavator Service Manual


COOLING SYSTEM

Checking Coolant Level

Check the cooling system every day to prevent overheating, loss of performance or engine damage.

Open the tailgate. Figure 10-70-2

Cleaning The Cooling System NOTE: Allow the cooling system and engine to cool before servicing or cleaning the cooling system. Open the tailgate. Figure 10-70-1 1

1

P-49161

Check the coolant level in the coolant recovery tank (Item 1) [Figure 10-70-2]. The coolant level must be between the MIN and MAX marks on the coolant recovery tank when the engine is cold. P-49137

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

NOTE: The cooling system is factory filled with propylene glycol (purple color). DO NOT mix propylene glycol with ethylene glycol. Close the tailgate.

Close the tailgate.

IMPORTANT

WARNING Do not remove radiator cap when the engine is hot. You can be seriously burned. W-2070-1285

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. Too little antifreeze reduces the additives which protect the internal engine components; reduces the boiling point and freeze protection of the system.

WARNING 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.

Always add a premixed solution. Adding full strength concentrated coolant can cause serious premature engine damage. I-2124-0497

W-2019-1285

10-70-1

337/341 Excavator Service Manual


COOLING SYSTEM (CONT’D)

Put a hose on the drain valve on the engine block.

Replacing The Coolant

Figure 10-70-5

See SERVICE SCHEDULE on Page 10-50-1 for correct service intervals.

1

WARNING Do not remove radiator cap when the engine is hot. You can be seriously burned. W-2070-1285

Figure 10-70-3 P-49237

Open the drain valve (Item 1) [Figure 10-70-5] 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 FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.) P-49182

When the engine is cool, loosen and remove the radiator cap (Item 1) [Figure 10-70-3]. Figure 10-70-4

NOTE: The cooling system is factory filled with propylene glycol (purple color). DO NOT mix propylene glycol with ethylene glycol. 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. 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. P-49151

Close the tailgate. Put a hose on the drain valve at the bottom of the radiator. Open the drain valve (Item 1) [Figure 10-70-4] and drain the coolant into a container.

10-70-2

337/341 Excavator Service Manual


FUEL SYSTEM

WARNING

Fuel Specifications 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%

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

Removing Water From The Fuel Filter Open the tailgate. Figure 10-80-2

See your fuel supplier for local recommendations. Filling The Fuel Tank Figure 10-80-1

1 1 P-49161

Loosen the drain (Item 1) [Figure 10-80-2] at the bottom of the filter to drain water from the filter. See the Service Schedule (See SERVICE SCHEDULE on Page 10-50-1) for the service interval when to remove the water from the fuel filter.

P-49110

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

Close the tailgate.

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! Install and tighten the fuel fill cap. Close the right side cover. Clean up any spilled fuel.

10-80-1

337/341 Excavator Service Manual


FUEL SYSTEM (CONT’D)

Fuel Filter

Draining The Fuel Tank Open the tailgate.

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

Figure 10-80-3

Open the tailgate. Figure 10-80-4

1 1 P-49181

P-49161

See the Service Schedule (See SERVICE SCHEDULE on Page 10-50-1) for the correct service interval. 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. Put oil on the seal of the new filter.

Drain the fuel into a container. Install the fuel filter and hand tighten. Reuse, recycle or dispose of fuel in an environmentally safe manner.

Remove air from the fuel system. (See Removing Air From The Fuel System on Page 10-80-3.)

Close the tailgate. Close the tailgate.

WARNING 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-2072-0496

10-80-2

337/341 Excavator Service Manual


FUEL SYSTEM (CONT’D)

WARNING

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. Open the tailgate. Figure 10-80-5

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-2072-0496

1

P-49161

Open the fuel filter vent (Item 1) [Figure 10-80-5]. Figure 10-80-6

1

2

P-49171

Operate the hand pump (priming bulb) (Item 1) [Figure 10-80-6] 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 2) [Figure 10-80-6] (at the fuel injection pump) briefly until the engine runs smoothly. Close the tailgate.

10-80-3

337/341 Excavator Service Manual


ENGINE LUBRICATION SYSTEM

Oil Chart

Checking Engine Oil

Figure 10-90-2

Check the engine oil every day before starting the engine for the work shift. Figure 10-90-1

1

P-49156

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 the oil chart [Figure 10-90-2].

10-90-1

337/341 Excavator Service Manual


ENGINE LUBRICATION SYSTEM (CONT’D)

Figure 10-90-5

Replacing Oil And Filter See the Service Schedule (See SERVICE SCHEDULE on Page 10-50-1) for the service interval for replacing the engine oil and filter. Run the engine until it is at operating temperature. Stop the engine.

1

Open the tailgate. Figure 10-90-3 P-49152

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 plug. 1

Return the drain hose to the storage position. Figure 10-90-6

P-49157

Remove the drain hose (Item 1) [Figure 10-90-3] from the storage position. Figure 10-90-4 1

P-49159

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

1

Put oil in the engine. (See FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.)

P-49158

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

Install the fill cap. 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. Close the tailgate.

10-90-2

337/341 Excavator Service Manual


HYDRAULIC SYSTEM

Add the correct fluid to the reservoir until it is visible in the sight gauge. (See FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.)

Checking And Adding Hydraulic Oil Put the machine on a flat level surface.

Check the cap and clean as necessary. Replace the cap if damaged.

Retract the arm and bucket cylinders, put the bucket on the ground and lower the blade. Stop the engine.

Install the cap.

Open the tailgate.

Close the tailgate.

Figure 10-100-1 2

1

P-49142

Check the hydraulic fluid level, it must be visible in the sight gauge (Item 1) [Figure 10-100-1]. Clean the surface around the reservoir (breather) cap and remove the cap (Item 2) [Figure 10-100-1] from the reservoir. Figure 10-100-2

1

P-49143

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.

10-100-1

337/341 Excavator Service Manual


HYDRAULIC SYSTEM (CONT’D)

Figure 10-100-4

Replacing The Hydraulic Oil See the Service Schedule (See SERVICE SCHEDULE on Page 10-50-1) for the correct service interval.

WARNING 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-2072-0496

1 P-49148

Remove the drain hose cap (Item 1) [Figure 10-100-4]. Drain the fluid into a container.

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

Recycle or dispose of the fluid in an environmentally safe manner.

Open the tailgate. Install the drain hose cap (Item 1) [Figure 10-100-4]. Figure 10-100-3 Add the correct fluid to the reservoir until it is visible in the sight gauge. (See FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.) Run the machine through the hydraulic functions. Stop the engine. Check the fluid level and add as needed. Close the tailgate.

1 P-49144

Pull the hydraulic reservoir drain hose (Item 1) [Figure 10-100-3] out of the Excavator upperstructure.

10-100-2

337/341 Excavator Service Manual


HYDRAULIC SYSTEM (CONT’D)

Replacing The Case Drain Filter

Replacing The Hydraulic Filter

Open the right side cover.

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

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

Close the right side cover.

WARNING

1 2

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

P-49150

Remove the hydraulic filter (Item 1) [Figure 10-100-5]. Clean the housing where the filter gasket makes contact. Put clean hydraulic fluid on the gasket. Install the new filter and hand tighten only. Close the right side cover.

10-100-3

337/341 Excavator Service Manual


HYDRAULIC SYSTEM (CONT’D)

Figure 10-100-8

Diagnostic Couplers Figure 10-100-6

1 1

P-49145

The test port (Item 1) [Figure 10-100-8] located on the manifold assembly, is used to check pilot pressure to the left joystick, right joysticks and auxiliary pedal.

P16613

Open the right side cover (Item 1) [Figure 10-100-6].

Figure 10-100-9

There are four diagnostic ports located on the hydraulic circuitry. Figure 10-100-7

1 1 2 P-49147

The test port (Item 1) [Figure 10-100-9] located on the build up valve, is used to bleed air out of the hydraulic system after a major hydraulic service has been completed. (See BUILD UP VALVE on Page 20-170-1.)

P-49146

The port (Item 1) [Figure 10-100-7], located on the control valve is to test hydraulic pump pressure. The test port (Item 2) [Figure 10-100-7] on the hydraulic control valve is used to check hydraulic pump load sense pressure.

10-100-4

337/341 Excavator Service Manual


LUBRICATION OF THE EXCAVATOR

Figure 10-110-2

Procedure Lubricate the hydraulic excavator as specified in the SERVICE SCHEDULE (See SERVICE SCHEDULE on Page 10-50-1) for the best performance of the machine.

6 5 6

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

5

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

6 7

Figure 10-110-1

5 4

2

P-49112

5. Boom Swing Pin (3) [Figure 10-110-2] 2 6. Boom Swing Pivot (3) [Figure 10-110-2] 7. Boom Cylinder Base End (1) [Figure 10-110-2] Figure 10-110-3

3

3

1 1 P-49114

8 Ref Description (# of Fittings) 1. Blade Cylinder Rod End (2) [Figure 10-110-1] 2. Blade Cylinder Base End (2) [Figure 10-110-1] 3. Blade Pivots (2) [Figure 10-110-1]

P-49113

4. Boom Swing Cylinder Rod End (1) [Figure 10-110-1] 8. Boom Pivot (1) [Figure 10-110-3]

10-110-1

337/341 Excavator Service Manual


LUBRICATION OF THE HYDRAULIC EXCAVATOR (CONT’D)

Figure 10-110-6

Procedure (Cont’d) Figure 10-110-4 14

10

15

15 15 P19384

14. Bucket Cylinder Rod End (1) [Figure 10-110-6] 9

P-49111

9. Boom Cylinder Rod End (1) [Figure 10-110-4]

15. Bucket Pivot (3) [Figure 10-110-6] Figure 10-110-7

10. Arm Cylinder Base End (1) [Figure 10-110-4] Figure 10-110-5

17

17 11

16 13

P-19385

12

16. X-Change Latch (1) [Figure 10-110-7] P-49108

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

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

10-110-2

337/341 Excavator Service Manual


LUBRICATION OF THE HYDRAULIC EXCAVATOR (CONT’D)

Figure 10-110-9

Procedure (Cont’d) 21 Figure 10-110-8

19 20

18

P-49109

21

18. Boom Swing Cylinder Base End (1) [Figure 10-110-8] Lubricate the following locations on the hydraulic excavator EVERY 50 HOURS:

P-49138

19. Slew Circle (1) [Figure 10-110-8] 20. Slew Pinion (1) [Figure 10-110-8]. (Install 3 to 4 pumps of grease then rotate the upperstructure 90°. Install 3 to 4 pumps of grease and again rotate the upperstructure 90°. Repeat this until the slew pinion has been greased at four positions.)

21. Tailgate Hinge (2) [Figure 10-110-9]

10-110-3

337/341 Excavator Service Manual


TRAVEL MOTOR

Draining The Travel Motor

Checking Oil Level

See SERVICE SCHEDULE on Page 10-50-1 for the correct service interval.

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. 1

WARNING

2

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 P-49184

Park the Excavator on a level surface with the plugs (Item 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 plug hole until the lube level is at the bottom edge of the hole. (See FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.) Install the plug (Item 1) [Figure 10-120-1].

Add lubricant through the hole if the lube level is low. (See FUEL, COOLANT AND LUBRICANTS on Page SPEC-60-1.)

10-120-1

337/341 Excavator Service Manual


SPARK ARRESTOR MUFFLER

Figure 10-130-1

See SERVICE SCHEDULE on Page 10-50-1 for the correct service interval. Do not operate the Excavator with a defective exhaust system.

IMPORTANT

1

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.

P-49132

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. Stop the engine. Install and tighten the plug.

Make reference to local laws and regulations for spark arrestor requirements.

Close the tailgate.

I-2061-0195

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

337/341 Excavator 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-49235

Loosen the nut (Item 1) on the belt idler pulley. Loosen the nut (Item 2) and tighten the bolt (Item 3) until the belt tension is correct. Tighten the two nuts (Item 1) & (Item 2) [Figure 10-140-2].

P-49133

Using a belt tension gauge, measure the belt tension midway between the crankshaft pulley and alternator pulley [Figure 10-140-1]. Belt tension is as follows: New belt 107-114 ft. lbs (145-155 Nm) Used belt 92-99 ft. lbs. (125-134 Nm)

10-140-1

337/341 Excavator Service Manual


SEAT BELT

Figure 10-150-1

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.

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

20-21-1 20-21-9 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 20-24-6 20-24-4 20-24-3 20-24-2 20-24-1

HYDRAULIC SYSTEM

BOOM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-10 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-3 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1 BOOM SWING CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BOOM SWING LOCK VALVE . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . .

20-200-1 20-200-7 20-200-1 20-200-4 20-200-3 20-200-1

BUCKET CYLINDER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BUILD UP VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . .

20-22-1 20-22-8 20-22-5 20-22-4 20-22-2 20-22-1

20-23-1 20-23-7 20-23-5 20-23-4 20-23-3 20-23-1

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

Continued On Next Page

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HYDRAULIC SYSTEM (C0NT’D) CASE DRAIN FILTER MOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-180-1 CLAMP CYLINDER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-7 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-4 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25-1 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 VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-32-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 20-32-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-32-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-32-4 Testing And Adjusting The Crossport Relief Valve. . . . . . . . . . 20-32-1 DIRECT TO TANK VALVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-160-1 DUAL SEQUENCE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-4 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-150-1 HYDRAULIC CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1 Arm Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-48 Auxiliary Valve Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-60 Blade Valve Section (S/N 234611001-234611163 And S/N 234711001234711197) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-23 Blade Valve Section (S/N 234611164 & Above And 234711198 & Above) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-31 Boom Swing Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-16 Boom Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-54 Bucket Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-42 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-6 Inlet Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-76 Left Travel Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-72 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1 Right Travel Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-68 Slew Valve Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-7 Continued On Next Page

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HYDRAULIC SYSTEM (C0NT’D) HYDRAULIC FILTER MOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . 20-120-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-120-1 HYDRAULIC PUMP (234611001 - 234613190, 234613193 - 234613247, 234711001 - 234713440) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-49 Coupler Removal And Installation . . . . . . . . . . . . . . . . . . . . . 20-50-18 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-40 Hydraulic Pump Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-19 Hydraulic Pump Work Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1 Initial Torque Limiter Valve Setting. . . . . . . . . . . . . . . . . . . . . 20-50-29 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-39 Pump Control Disassembly And Assembly . . . . . . . . . . . . . . 20-50-33 Pump Control Parts Identification . . . . . . . . . . . . . . . . . . . . . 20-50-32 Pump Control Removal And Installation . . . . . . . . . . . . . . . . 20-50-33 Pump Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-4 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-17 Torque Limiter Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . 20-50-26 Torque Limiter Valve Disassembly . . . . . . . . . . . . . . . . . . . . . 20-50-21 Torque Limiter Valve Installation . . . . . . . . . . . . . . . . . . . . . . 20-50-31 Torque Limiter Valve Parts Identification . . . . . . . . . . . . . . . . 20-50-20 Torque Limiter Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . 20-50-21 HYDRAULIC PUMP (S/N 234613191, 234613192, 234613248 & ABOVE, 234713441 & ABOVE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-1 Coupler Removal And Installation . . . . . . . . . . . . . . . . . . . . . 20-51-17 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-29 Hydraulic Pump Work Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-1 Hydraulic Pump Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-18 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-28 Pump Control Disassembly And Assembly . . . . . . . . . . . . . . 20-51-22 Pump Control Parts Identification . . . . . . . . . . . . . . . . . . . . . 20-51-21 Pump Control Removal And Installation . . . . . . . . . . . . . . . . 20-51-22 Pump Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-4 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-16 Test Fitting Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-4 Torque Limiter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-13 Torque Limiter Assembly Parts Identification . . . . . . . . . . . . . 20-50-19 Torque Limiter Valve Assembly Removal And Installation . . . 20-51-20 Torque Limiter Valve Assembly Disassembly And Assembly 20-51-20 HYDRAULIC RESERVOIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-130-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-130-1 Continued On Next Page

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HYDRAULIC SYSTEM (C0NT’D) HYDRAULIC SYSTEM INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-8 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 Travel Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-7 Troubleshooting The Upperstructure Slew Circuit . . . . . . . . . . . . . . . . . . 20-10-6 HYDRAULIC X-CHANGE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-210-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-210-14 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-210-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-210-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-210-1 LEFT CONTROL LEVER (JOYSTICK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-14 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-9 Handle Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-3 Joystick Assembly Removal And Installation . . . . . . . . . . . . . . . . . . . . . 20-111-6 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-8 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-111-1 MAIN RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-1 MANIFOLD ASSEMBLY/ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1 Adjusting The Pilot Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1 Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-8 Manifold Assembly/Accumulator Parts Identification . . . . . . . . . . . . . . . . 20-60-7 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-4 Testing Pilot Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1 OIL COOLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-140-1 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-140-1 PORT RELIEF VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31-1 Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31-2 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31-1 Port Relief Valve Pressure Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31-1 PRESSURE REDUCING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-33-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-33-1 REMOVING AIR FROM HYDRAULIC SYSTEM. . . . . . . . . . . . . . . . . . . . . 20-190-1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-190-1 Continued On Next Page

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HYDRAULIC SYSTEM (C0NT’D) RIGHT CONTROL LEVER (JOYSTICK). . . . . . . . . . . . . . . . . . . . . . . 20-110-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-16 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-11 Handle Removal And Installation. . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-3 Joystick Assembly Removal And Installation. . . . . . . . . . . . . . . . . 20-110-7 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-10 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-110-1 SWING MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-11 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-6 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-10 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-5 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-90-1 SWING MOTOR DRIVE CARRIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-8 Checking The Drive Carrier Shaft End Play. . . . . . . . . . . . . . . . . . . 20-91-4 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-5 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-7 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-3 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-91-1 SWIVEL JOINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-4 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-80-1 TRAVEL CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly And Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20-112-1 20-112-4 20-112-3 20-112-1

TRAVEL MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-13 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-3 Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-2 Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-70-1

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BOBCAT 337 COMPACT EXCAVATOR Service Repair Manual SN 234611001 & Above  
BOBCAT 337 COMPACT EXCAVATOR Service Repair Manual SN 234611001 & Above  
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