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Bobcat 645 Loader Service Manual (SN 514811001-514899999)

Format: PDF (Printable Document)

File Language: English

File Pages: 358

File Size: 15.91 MB (Speed Download Link)

Brand: Bobcat

Model: 645 Loader

Book No: 6724493

Serial No: SN 514811001-514899999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat 645 Loader Service Manual (SN 514811001-514899999)

The Bobcat 645 is an older skid-steer-class loader that still earns its keep on small jobs, farms, and in rental yards. This service manual is what you pull when you're past warranty and need real repair info, not just how to run the machine. Around my shop, this kind of manual is what we use for scheduled services, engine work, hydraulic troubleshooting, and getting a down unit turned around without guesswork.

What this manual helps you do

  • Diagnose hydraulic issues, check pressures with gauges, and trace leaks on the loader and auxiliary circuits
  • Troubleshoot the hydrostatic drive system, check charge pressure, and follow procedures to chase drive complaints
  • Rebuild or replace major components like cylinders, drive motors, and mechanical linkages with step-by-step teardown and assembly sequences
  • Trace electrical faults using wiring diagrams, then verify repairs on charging, starting, and safety circuits
  • Set adjustments on controls, linkages, and chain/drive systems so the loader runs within spec after repairs

Who this is for

This is for anyone maintaining or repairing a Bobcat 645 within serial numbers 514811001 to 514899999: small contractors, farm owners, rental fleets, and shop or field techs. If you just need basic operating instructions or daily checks, you want the operator's handbook instead, not this manual.

FAQ

Q: Is this a searchable PDF and are the wiring diagrams readable?

A: Yes, it's typically a clear PDF you can search by keyword, and the wiring diagrams are laid out to be zoomed in on a screen.

Q: How do I know if it covers my exact 645?

A: If your serial number falls between 514811001 and 514899999, this is the right manual. If it doesn't, you need a different book.

Q: Is this the right document if I'm doing full repairs, not just maintenance?

A: Yes, this is the workshop-level service manual, meant for real tear-down and diagnostic work, not just fluid changes.

Bottom line: If your 645's serial number is in that range and you're doing your own repairs, this is the manual you want. If your serial is outside that range, skip it.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • ALPHABETICAL INDEX
  • CONTENTS
    • FOREWORD
    • SAFETY INSTRUCTIONS
    • SERIAL NUMBER LOCATIONS
    • LOADER SERIAL NUMBER
    • ENGINE SERIAL NUMBER
    • DELIVERY REPORT
    • BOBCAT LOADER IDENTIFICATION
  • PREVENTIVE MAINTENANCE
    • SERVICE SCHEDULE
    • LIFTING AND BLOCKING THE LOADER
      • Procedure
    • TRANSPORTING THE LOADER
      • Procedure
    • TOWING THE LOADER
      • Procedure
    • STOPPING THE BOBCAT LOADER
    • LIFTING THE LOADER
      • Four Point Lift
      • Single Point Lift
    • LIFT ARM SUPPORT DEVICE
      • Engaging The Lift Arm Support Device
      • Disengaging The Lift Arm Support Device
    • OPERATOR CAB
      • Description
      • Raising The Operator Cab
      • Lowering The Operator Cab
      • Raising The Operator Cab (Hand Controls)
      • Lowering The Operator Cab (Hand Controls)
      • Emergency Exit
    • SEAT BAR RESTRAINT SYSTEM
      • Description (Foot Controls)
      • Seat Bar Inspection (Foot Controls)
      • Seat Bar Maintenance (Foot Controls)
      • Description (Hand Controls)
      • Seat Bar Inspection (Hand Controls)
      • Seat Bar Maintenance (Hand Controls)
    • AIR CLEANER SERVICE
      • Replacing Filter Element
    • FUEL SYSTEM
      • Fuel Specifications
      • Filling The Fuel Tank
      • Fuel Filter
      • Removing Air From The Fuel System
    • ENGINE LUBRICATION SYSTEM
      • Checking Engne Oil
      • Replacing Oil And Filter
    • ENGINE COOLING SYSTEM
      • Cleaning The Cooling System
      • Checking The Coolant Level
      • Removing Coolant From The Cooling System
      • Proplylene Glycol
    • ALTERNATOR BELT
      • Adjusting The Alternator Belt
    • BOB-TACH
    • FAN GEARBOX
      • Checking And Maintaining
    • ELECTRICAL SYSTEM
      • Using A Booster Battery (Jump Starting)
    • HYDRAULIC / HYDROSTATIC SYSTEM
      • Replacing Hydraulic Fluid
      • Hydraulic Reservoir Breather Cap
    • SPARK ARRESTOR MUFFLER
      • Cleaning Procedure
    • TIRE MAINTENANCE
      • Wheel Nuts
      • Tire Rotation
      • Tire Mounting
    • FINAL DRIVE TRANSMISSION (CHAINCASE)
      • Checking And Adding Oil
      • Removing Oil From The Chaincase
    • DRIVE BELT
      • Adjusting The Drive Belt (Equipped With Fixed Drive Idler)
      • Adjusting The Drive Belt Equipped With The Spring Loaded Drive Idler
      • Drive Belt Replacement
    • LUBRICATION OF THE BOBCAT LOADER
      • Procedure
    • PIVOT PINS
    • REMOTE START SWITCH
      • Procedure
  • HYDRAULIC SYSTEM
    • TROUBLESHOOTING
    • HYDRAULIC SYSTEM INFORMATION
      • Flare Connections
      • O-Ring Face Seal Connection
      • Staright Thread O-Ring Fitting
      • Tubelines And Hoses
    • LIFT CYLINDER(S)
      • Checking The Lift Cylinder(s) For Internal Leakage
      • Removal And Installation
    • TILT CYLINDER
      • Checking The Tilt Cylinder For Internal Leakage
      • Removal And Installation
      • Rod End Seal Replacement
    • HYDRAULIC CYLINDER IDENTIFICATION
      • Lift Cylinder Components
      • Tilt Cylinder Components
    • HYDRAULIC CYLINDERS
      • Disassembly
      • Assembly
    • HYDRAULIC CONTROL VALVE
      • Removal And Installation
      • Checking The Main Relief Valve
      • Main Relief Valve Adjustment
      • Main Relief Valve Removal And Installation
      • Identification Chart
      • Disassembly And Assembly
      • Load Check Valve
      • Main Relief Valve
      • Port Relief Valve
      • Anti-Cavitation valve
      • Rubber Boot
      • Lift Spool Detent
      • Tilt Centering Spring
      • Auxiliary Spool
      • Auxiliary Electric Solenoid
      • Inspection
      • Identification & Installation Of Spool Seal
    • HYDRAULIC PUMP
      • Removal And Installation
      • Checking The Output Of The Hydraulic Pump
      • Disassembly And Assembly
      • Inspection
      • Identification
    • HYDRAULIC FILTER HOUSING
      • Removal And Installation
    • HYDRAULIC FLUID RESERVOIR
      • Removal And Installation
    • CONTROL PEDALS
      • Removal And Installation
      • Pedal Adjustment
    • PEDAL INTERLOCK LINKAGE
      • Removal And Installation
      • Adjustment
  • HYDROSTATIC SYSTEM
    • TROUBLESHOOTING
    • HYDROSTATIC SYSTEM INFORMATION
      • Replenishing Valve Function
    • CONTROL PANEL
      • Removal And Installation
      • Steering Shaft Removal And Installation
      • Steering Shaft Disassembly And Assembly
      • Steering Lever Removal And Installation
      • Rubber Boot Replacement
    • STEERING LINKAGE
      • Removal And Installation
      • Steering Linkage Adjustment
      • Steering Neutral Adjustment
    • HYDROSTATIC DRIVE MOTOR
      • Removal And Installation
      • Identification
      • Disassembly And Assembly
      • Inspection
    • HYDROSTATIC PUMP
      • Removal And Installation
      • Identification
      • Disassembly And Assembly
      • Inspection
      • Swashplate Pre-Load
    • DRIVE BELT HOUSING
      • Removal And Installation
    • SPRING LOADED DRIVE IDLER
      • Identification
      • Disassembly
      • Assembly
    • DRIVE BELT TENSIONER PULLEY
      • Removal And Installation
      • Disassembly
      • Assembly
      • Checking Pulley End Play
    • OIL COOLER
      • Removal And Installation
  • DRIVE SYSTEM
    • PARKING BRAKE
      • Removal And Installation
      • Disassembly And Assembly
    • PARKING BRAKE DISC
      • Removal And Installation
    • CHAINCASE FLUID
      • Removing Oil From The Chaincase
    • CHAINCASE COVERS
      • Center Chaincase Cover Removal And Installation
      • Front Chaincase Cover Removal And Installation
      • Rear Chaincase Cover Removal And Installation
    • MOTOR CARRIER
      • Shaft Seal Replacement
      • Removal And Installation
      • Disassembly
      • Assembly
    • AXLE SEAL
      • Removal And Installation
    • AXLE, SPROCKET AND BEARINGS
      • Removal And Installation
    • DRIVE CHAIN
      • Removal
  • MAIN FRAME
    • SEAT BAR
      • Removal And Installation
      • Assembly
      • Compressing The Gas Cylinder
    • OPERATOR CAB GAS CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • OPERATOR CAB
      • Removal And Installation
    • OPERATOR SEAT
      • Removal And Installation
    • BOB-TACH
      • Removal And Installation
      • Bob-Tach Lever And Wedge
      • Bob-Tach Stops
    • LIFT ARMS
      • Removal And Installation
    • REAR GRILL
      • Removal And Installation
    • FUEL TANK
      • Removal And Installation
      • Fuel Level Sender
    • REAR DOOR
      • Removal And Installation
      • Hood Removal And Installation
      • Bumper Removal And Installation
      • Door Latch Removal And Installation
      • Door Latch And Catch Adjustment
  • ELECTRICAL SYSTEM
    • ELECTRICAL SCHEMATICS
    • TROUBLESHOOTING
    • ELECTRICAL SYSTEM INFORMATION
      • Description
      • Fuse Location
    • BATTERY
      • Removal And Installation
      • Servicing The Battery
      • Using A Booster Battery (Jump Starting)
    • ALTERNATOR
      • Alternator Output Test
      • Rectifier (Diode) Test
      • Alternator Regulator Test
      • Removal And Installation
      • Adjusting The Alternator Belt
      • Disassembly And Inspection
      • Stator Continuity Test
      • Stator Ground Test
      • Rotor Continuity Test
      • Rotor Ground Test
      • Rectifier Continuity (Diode) Test
      • Assembly
    • STARTER
      • Removal And Installation
      • Disassembly And Assembly
      • External Pinion
      • Inspection And Repair
      • Magnetic Switch Test
      • No Load Test
      • Parts Identification
    • STANDARD INSTRUMENT PANEL
      • Removal And Installation
    • FRONT LIGHTS
      • Removal And Installation
    • RELAY SWITCHES
      • Location
      • Glow Plug Preheat Relay
  • ENGINE SERVICE
    • TROUBLESHOOTING
    • ENGINE SPEED CONTROL
      • Removal And Installation
      • Disassembly
    • RADIATOR
      • Removal And Installation
    • ENGINE MUFFLER
      • Removal And Installation
    • BLOWER HOUSING/FAN GEARBOX
      • Removal And Installation
      • Tension Pulley Removal And Installation
      • Blower Fan Disassembly And Assembly
    • FAN GEARBOX
      • Disassembly
      • Assembly
      • Checking Backlash
      • Identification
    • AIR CLEANER
      • Removal And Installation
    • ENGINE
      • Removal And Installation
      • Engine Mount Replacement
    • FLYWHEEL
      • Removal And Installation
      • Flywheel Ring Gear
    • INJECTION PUMP TIMING
      • Checking Procedure
      • Adjusting Injection Pump Timing
    • TIMING BELT
      • Removal
      • Installation
    • FUEL INJECTION PUMP
      • Removal
      • Installation
    • FUEL INJECTOR NOZZLE
      • Removal And Installation
      • Checking The Injector Nozzle
    • CYLINDER LOCATION AND COMPRESSION
      • Data
    • GLOW PLUGS
      • Removal And Installation
      • Checking The Glow Plugs
    • CYLINDER HEAD
      • Removing The Cylinder Head
      • Disassembly Of The Cylinder Head
      • Servicing The Cylinder Head
      • Checking The Valves
      • Checking Valve Springs
      • Checking The Valve Guides
      • Checking The Valve Seats
      • Checking The Combustion Chamber
      • Reassejmbly Of The Cylinder Head
      • Installing The Cylinder Head
    • ENGINE BLOCK
      • Disassembly Of The Engine
      • Assembly Of The Engine
    • PISTONS AND CONNECTING RODS
      • Disassembly And Assembly
      • Checking The Piston
    • CRANKSHAFT AND BEARINGS
      • Checking The Crankshaft
    • CRANKSHAFT PULLEY
      • Removal And Installation
    • PEUGEOT ENGINE TOOL KIT MEL1474
    • ENGINE TORQUE
  • SYSTEM ANALYSIS
    • BOBCAT INTERLOCK CONTROL SYSTEM (BICS™)
      • Inspecting The BICS™ Controller
      • Inspecting The Deactivation Of The Auxiliary Hydraulics System
      • Inspecting The Seat And Seat Bar Sensors
      • Inspecting The Traction Lock
      • Inspecting The Lift Arm By-Pass Control
      • Maintenance
      • Troubleshooting Chart
      • Troubleshooting Guide
        • BICS CONTROLLER
        • TRACTION LOCK
        • SEAT SENSOR
        • SEAT BAR SENSOR
        • LIFT LOCK BY-PASS VALVE
    • BICS™ SYSTEM CONTROLLER
      • Removal And Installation
      • Controller Test
    • SEAT BAR SENSOR
      • Removal And Installation
      • Seat Bar Sensor Test
    • SEAT SENSOR
      • Removal And Installation
      • Seat Sensor Test
    • TRACTION LOCK
      • Removal And Installation
    • LIFT LOCK BY-PASS VALVE
      • Removal And Installation
      • Disassembly And Assembly
    • TILT LOCK VALVE
      • Removal And Installation
      • Disassembly And Assembly
  • SPECIFICATIONS
    • SKID STEER LOADER SPECIFICATIONS
      • Performance
      • Controls
      • Engine
      • Hydraulic System
      • Electrical
      • Drive System
      • Capacities
      • Tires
      • Floor Pressure
    • ENGINE SPECIFICATIONS
      • Fuel Injection Nozzles
      • Fuel Injection Pump
      • Cylinder Head
      • Valves
      • Valve Springs
      • Valve Guides
      • Combustion Chamber
      • Cylinders
      • Piston Rings
      • Pistons
      • Connecting Rod
      • Crankshaft
    • TORQUE SPECIFICATIONS
    • HYDRAULIC / HYDROSTATIC FLUID SPECIFICATIONS
    • STANDARD TORQUE SPECIFICATIONS FOR BOLTS
    • DECIMAL AND MILLIMETER EQUIVALENTS
    • U.S. TO METRIC CONVERSION
  • SMR
    • 653-1

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