Bobcat 331, 331E, 334 Compact Excavator Service & Repair Manual

Service Manual ©Bobcat Company 2007 6903830 (7-07) 331 331E 334 Printed in U.S.A. 331 - S/N 234313000 & Above 331E - S/N 234412000 & Above 334 - S/N 234513000 & Above (G Series) chodina@live.co.uk chodina@live.co.uk

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MAINTENANCE SAFETY Never service the Bobcat Compact Excavator without instructions. Have good ventilation when welding or grinding painted parts. Wear dust mask when grinding painted parts. Toxic dust and gas can be produced. 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. Always lower the bucket and blade to the ground before doing any maintenance. Never modify equipment or add attachments not approved by Bobcat Company. 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 rear door closed except for service. Close and latch door before operating the excavator. Vent exhaust to outside when engine must be run for service. Exhaust system must be tightly sealed. Exhaust fumes can kill without warning. Cleaning and maintenance are required daily. MSW28-0805 Use the correct procedure to lift and support the excavator. 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. 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 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. Safety Alert Symbol: This symbol with a warning statement, means: “Warning, be alert! Your safety is involved!” Carefully read the message that follows. B-10731A CORRECT B-19964 CORRECT CORRECT B-19959 B-19965 WRONG WRONG B-19960 B-19966 WRONG WRONG B-19962 B-19958 WRONG B-19798 WRONG chodina@live.co.uk chodina@live.co.uk

chodina@live.co.uk chodina@live.co.uk

331/331E/334 Excavator Service Manual 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 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 CAB......................................................................... 40-01 CASE DRAIN FILTER ............................................ 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 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 FUEL LEVEL SENDER........................................... 50-01 FUEL SYSTEM........................................................ 10-01 FUEL TANK ............................................................. 40-01 GENERAL AIR CONDITIONING SERVICE GUIDELINES .......................................................... 70-01 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 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 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 ROPS CANOPY.......................................................40-01 Continued On Next Page chodina@live.co.uk chodina@live.co.uk

331/331E/334 Excavator 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 chodina@live.co.uk chodina@live.co.uk

331/331E/334 Excavator I Service Manual CONTENTS FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V SERIAL NUMBER LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX DELIVERY REPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X BOBCAT EXCAVATOR IDENTIFICATION . . . . . . . . . . . . . . . . . . . . XI SAFETY AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . 10-01 HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-01 UNDERCARRIAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-01 UPPERSTRUCTURE & SWING SECTION . . . . . . . . . . . . . . . . 40-01 ELECTRICAL SYSTEM AND ANALYSIS . . . . . . . . . . . . . . . . . . 50-01 ENGINE SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-01 HEATING, VENTILATION, AIR CONDITIONING . . . . . . . . . . . . 70-01 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPEC-01 SAFETY AND MAINTENANCE HYDRAULIC SYSTEM UNDERCARRIAGE UPPERSTRUCTURE & SWING SECTION ELECTRICAL SYSTEM AND ANALYSIS ENGINE SERVICE SPECIFICATIONS HEATING, VENTILATION, AIR CONDITIONING chodina@live.co.uk chodina@live.co.uk

331/ 331E/334 Excavator II Service Manual chodina@live.co.uk chodina@live.co.uk

331/331E/334 Excavator III 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, oil or 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. 8. Check the electrical charging system. chodina@live.co.uk chodina@live.co.uk

331/ 331E/334 Excavator IV Service Manual chodina@live.co.uk chodina@live.co.uk

Bobcat 331, 331E, 334 Compact Excavator Service & Repair Manual

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Model	Serial Number
Bobcat 331	234313000 & Above
Bobcat 331E	234412000 & Above
Bobcat 334	234513000 & Above