Bobcat 325, 328 Compact Excavator Service & Repair Manual

6986940 (2-08) Printed in U.S.A. © Bobcat Company 2008 Service Manual 325, 328 Compact Excavator 325 S/N AAC511001 & Above 325 S/N A9K011001 & Above 328 S/N A9K111001 & Above

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 tailgate closed except for service. Close and latch tailgate 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

325/328 Service Manual ALPHABETICAL INDEX AIR CLEANER ............................................. 10-01, 60-01 AIR CLEANER SERVICE ....................................... 10-01 ALTERNATOR ....................................................... 50-01 ARM ........................................................................ 40-01 ARM CYLINDER ..................................................... 20-01 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 BUCKET ................................................................. 40-01 BUCKET CYLINDER .............................................. 20-01 BUILD UP VALVE ................................................... 20-01 CAB......................................................................... 40-01 CASE DRAIN FILTER ............................................ 20-01 CLAMP CYLINDER ................................................ 20-01 CONVERSIONS ............................................... SPEC-01 CONTROL PATTERN SELECTOR VALVE ............20-01 COOLING SYSTEM................................................ 10-01 CROSS PORT RELIEF VALVES ........................... 20-01 DELUXE INSTRUMENT PANEL SETUP................ 50-01 DIAGNOSTICS SERVICE CODE ........................... 50-01 DIRECT TO TANK 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 FLOOR MAT AND FLOOR PLATE ......................... 40-01 FUEL, COOLANT AND LUBRICANTS ............. SPEC-01 FUEL LEVEL SENDER........................................... 50-01 FUEL SYSTEM ....................................................... 10-01 FUEL TANK............................................................. 40-01 HEATER AIR FILTER (WITH CAB OPTION ONLY) ................................................................................. 10-01 HEATER COIL ......................................................... 70-01 HEATER FAN .......................................................... 70-01 HEATER UNIT ......................................................... 70-01 HEATER VALVE ...................................................... 70-01 HORN ..................................................................... 40-01 HYDRAULIC CONTROL VALVE ............................. 20-01 HYDRAULIC CONNECTION SPECS ............... SPEC-01 HYDRAULIC FLUID SPECIFICATIONS ............ SPEC-01 HYDRAULIC FILTER MOUNT................................. 20-01 HYDRAULIC PUMP ................................................ 20-01 HYDRAULIC PUMP START-UP .............................. 20-01 HYDRAULIC RESERVOIR ...................................... 20-01 HYDRAULIC SYSTEM ............................................ 10-01 HYDRAULIC SYSTEM INFORMATION ................. 20-01 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 MAIN RELIEF VALVES............................................ 20-01 MANIFOLD ASSEMBLY/ACCUMULATOR ............. 20-01 MUFFLER................................................................ 60-01 OIL COOLER........................................................... 20-01 OPERATOR CAB (ROPS/TOPS) ............................ 10-01 PORT RELIEF VALVES........................................... 20-01 PRESSURE REDUCING VALVE............................. 20-01 RADIATOR ..............................................................60-01 RECONDITIONING THE ENGINE .........................60-01 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

325/328 Service Manual ALPHABETICAL INDEX (CONT’D) SEAT BELT ............................................................ 10-01 SERVICE SCHEDULE ............................................10-01 SPARK ARRESTOR MUFFLER ..............................10-01 SPECIFICATIONS ............................................. SPEC-01 SUSPENSION SEAT AND SEAT MOUNT .............. 40-01 STARTER ................................................................ 50-01 STANDARD SEAT AND SEAT MOUNT .................. 40-01 SWING CIRCLE GEAR ........................................... 30-01 SWING FRAME ....................................................... 40-01 SWING MOTOR ..................................................... 20-01 SWING MOTOR DRIVE CARRIER ......................... 20-01 SWIVEL JOINT .......................................................20-01 TAILGATE .....................................................10-01, 40-01 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 MOTOR ..........................................10-01, 20-01 TROUBLESHOOTING............................................. 60-01 TWO SPEED SWITCH ............................................ 50-01 UPPERSTRUCTURE .............................................. 40-01 UPPERSTRUCTURE SLEW LOCK .............10-01, 40-01 X-CHANGE ® .......................................................... 40-01

I 325/328 Service Manual CONTENTS FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V FIRE PREVENTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII 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 HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70-01 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPEC-01 SAFETY AND MAINTENANCE HYDRAULIC SYSTEM UNDERCARRIAGE UPPERSTRUCTURE & SWING SECTION ELECTRICAL SYSTEM AND ANALYSIS ENGINE SERVICE SPECIFICATIONS HEATER

II 325/328 Service Manual

III 325/328 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. 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.

IV 325/328 Service Manual

Bobcat 325, 328 Compact Excavator Service & Repair Manual

You're Reading a Preview

Recently Viewed