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Bobcat 853 Loader Service Manual (SN 512811001-512899999)

Format: PDF (Printable Document)

File Language: English

File Pages: 462

File Size: 20.02 MB (Speed Download Link)

Brand: Bobcat

Model: 853 Loader

Book No: 6724012

Serial No: SN 512811001-512899999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat 853 Loader Service Manual (SN 512811001-512899999)

The Bobcat 853 is an older skid-steer class loader that still earns its keep loading trucks, running forks, and handling dirt and pallets all day. The service manual is what the shop or field tech grabs when the machine is down and they need real specs and step-by-step procedures, not safety tips. You use this when you're chasing a hydraulic issue, doing engine work, or trying to put a failed drive system back in service. If you're running a small fleet or your own 853, this is what keeps turnaround time short and guesswork low.

What this manual helps you do

  • Diagnose hydraulic and hydrostatic problems, then check pressures and isolate bad pumps, valves, or drive motors
  • Trace electrical faults using wiring diagrams and follow test procedures for switches, relays, and sensors
  • Follow teardown and reassembly steps for the diesel engine, including cylinder head and fuel system work
  • Rebuild or reseal major components like hydraulic cylinders, control valves, and drive-related parts
  • Adjust linkages, controls, and safety interlocks, and verify settings after repairs so the loader operates correctly

Who this is for

This fits a shop mechanic, field tech, rental yard, or owner-operator who is actually repairing a Bobcat 853 within serial range 512811001 to 512899999. If you just need operating instructions or basic maintenance intervals, you want the operator's handbook instead.

FAQ

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

A: Yes, these manuals are typically scanned or native PDFs you can search, and wiring diagrams are laid out so you can zoom in and read pin labels.

Q: How do I know if it covers my exact 853?

A: If your serial number falls between 512811001 and 512899999, this is the right service manual. If it doesn't, you need the manual for your specific range.

Q: Is this the right document if I'm only changing fluids and filters?

A: It will work, but it's overkill. For basic service and daily checks, the operator's handbook is simpler and faster to use.

Bottom line, if you're repairing or diagnosing a Bobcat 853 in that serial range, this is the right service manual. If your serial number is outside that range, it isn't.

📘 Show Index

Table of Contents:

  • MAINTENANCE SAFETY
  • CONTENTS
    • FOREWORD
    • SAFETY INSTRUCTIONS
    • SERIAL NUMBER LOCATIONS
    • LOADER SERIAL NUMBER
    • ENGINE SERIAL NUMBER
    • DELIVERY REPORT
    • BOBCAT LOADER IDENTIFICATION
    • OPTIONS AND ACCESSORIES
  • 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
      • Emergency Exit
    • SEAT BAR RESTRAINT SYSTEM
      • Description
      • Seat Bar Inspection
      • Seat Bar Maintenance
    • 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 Engine Oil
      • Replacing Oil And Filter
    • ENGINE COOLING SYSTEM
      • Cleaning The Cooling System
      • Checking The Coolant Level
      • Removing Coolant From The Cooling System
      • Propylene Glycol
    • ALTERNATOR BELT
      • Adjusting The Alternator Belt
    • USING A BOOSTER BATTERY (Jump Starting)
      • Procedure
    • HYDRAULIC/HYDROSTATIC SYSTEM
      • Checking And Adding Fluid
      • Replacing Hydraulic/Hydrostatic Filters
      • 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
    • FAN GEARBOX
      • Checking And Maintaining
    • LUBRICATING THE LOADER
      • Procedure
    • REMOTE START SWITCH
      • Procedure
  • HYDRAULIC SYSTEM
    • HYDRAULIC / HYDROSTATIC SCHEMATICS
    • TROUBLESHOOTING
    • HYDRAULIC SYSTEM INFORMATION
      • Flare Connections
      • O–ring Face Seal Connection
      • Straight Thread O–ring Fitting
      • Tubelines And Hoses
    • LIFT CYLINDER(S)
      • Checking The Lift Cylinder
      • Removal And Installation
    • TILT CYLINDER
      • Checking The Tilt Cylinder
      • Removal And Installation
      • Rod End Seal
    • HYDRAULIC CYLINDER
      • Lift Cylinder Identification
      • Tilt Cylinder Identification
      • Disassembly
      • Assembly
    • MAIN RELIEF VALVE
      • Checking The Main Relief Valve
      • Checking The Main Relief Valve Without Auxiliaries
      • Removal And Installation
    • DUAL PRESSURE MAIN RELIEF VALVE – 853H
      • Checking The Low Setting
      • Checking The High Setting
      • Adjusting The Low Setting
      • Adjusting The High Setting
    • SELECT VALVE (G.E.M. Block) 853H
      • Checking The Main Relief Valve
    • HYDRAULIC CONTROL VALVE
      • Removal And Installation
      • Identification Chart
      • Disassembly And Assembly
      • Main Relief Valve
      • Port Relief Valve
      • Anti–Cavitation Valve
      • Rubber Boot
      • Lift Spool And Detent
      • Tilt Spool And Centering Spring
      • Auxiliary Spool
      • Auxiliary Electric Solenoid
      • H Port – Auxiliary Section
      • Base End Restrictor
      • Inspection
      • Spool Seal Installation
    • HYDRAULIC PUMP
      • Checking The Output Of The Pump
      • Removal And Installation
      • Parts Identification
      • Disassembly
      • Inspection
      • Assembly
    • HYDRAULIC PUMP (Double Gear) 853H
      • Checking The Output Of The Pump
      • Removal And Installation
      • Parts Identification
      • Disassembly
      • Inspection
      • Assembly
    • BUCKET POSITION VALVE (Optional)
      • Removal And Installation
    • HYDRAULIC FLUID RESERVOIR
      • Removal And Installation
    • HYDROSTATIC FILTER HOUSING
      • Removal And Installation
    • HYDRAULIC FILTER HOUSING
      • Removal And Installation
    • CONTROL PEDALS
      • Removal And Installation
      • Pedal Adjustment
    • PEDAL INTERLOCK LINKAGE
      • Removal And Installation
      • Pedal Interlock Linkage Adjustment
  • HYDROSTATIC SYSTEM
    • TROUBLESHOOTING
    • HYDROSTATIC SYSTEM INFORMATION
      • Replenishing Valve Function
    • FRONT PANEL
      • Removal And Installation
    • STEERING LEVERS
      • Disassembly And Assembly
      • Pre–Adjustment Checks
      • Adjusting Lever Freeplay
      • Adjusting The Wheel RPM Forward Compared To Reverse Travel
      • Adjusting The Steering Neutral Setting
      • Adjusting The Wheel RPM Left Compared To Right Side
    • HYDROSTATIC MOTOR
      • Removal And Installation
      • Parts Identification
      • Disassembly
      • Inspection
      • Assembly
      • Timing The Hydrostatic Motor
    • HYDROSTATIC PUMP
      • Removal And Installation
      • Replenishing/High Pressure Relief Valve
      • Parts Identification
      • Hydraulic Pump Removal
      • Hydrostatic Pump Separation
      • Charge Pump Disassembly
      • Disassembly
      • Inspection
      • Assembly
      • Charge Pump Assembly
      • Hydrostatic Pump Connection
      • Hydraulic Pump Installation
      • Hydrostatic Pump Neutral Adjustment
    • DRIVE BELT SHIELD
      • Removal And Installation
    • DRIVE BELT
      • Adjusting The Drive Belt
      • Replacing The Drive Belt
    • DRIVE BELT TENSIONER PULLEY
      • Removal And Installation
      • Disassembly
      • Assembly
      • Checking Pulley End Play
    • OIL COOLER
      • Removal And Installation
  • DRIVE SYSTEM
    • PARKING BRAKE PEDAL
      • Removal And Installation
      • Disassembly And Assembly
    • PARKING BRAKE DISC
      • Removal And Installation
    • FRONT CHAINCASE COVER
      • Removal And Installation
    • REAR CHAINCASE COVER
      • Removal And Installation
    • AXLE SEAL
      • Removal And Installation
    • AXLE, SPROCKET AND BEARINGS
      • Removal And Installation
    • REDUCTION GEARCASE
      • Reduction Gearcase Seal
      • Removal And Installation
      • Checking Reduction Gearcase
      • Disassembly
      • Assembly
    • DRIVE CHAIN
      • Removal And Installation
    • CHAINCASE FLUID
      • Removing The Fluid From The Chaincase
  • 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
    • REAR DOOR
      • Removal And Installation
      • Hood Removal And Installation
      • Bumper Removal And Installation
      • Door Latch Removal And Installation
      • Door Latch And Catch Adjustment
    • FUEL TANK
      • Removal And Installation
      • Inlet Screen
  • ELECTRICAL SYSTEM
    • ELECTRICAL SCHEMATICS
    • TROUBLESHOOTING
    • ELECTRICAL SYSTEM INFORMATION
      • Description
      • Fuse Location (Standard & BOSS® Option)
    • BATTERY
      • Removal And Installation
    • ALTERNATOR
      • Alternator Output Test
      • Rectifier (Diode) Test
      • Alternator Regulator Test
      • Removal And Installation
      • Disassembly And Inspection
      • Stator Continuity Test
      • Stator Ground Test
      • Rotor Continuity Test
      • Rotor Ground Test
      • Rectifier Continuity (Diode) Test
      • Assembly
    • STARTER
      • Removal And Installation
      • Checking The Starter
      • Parts Identification
      • Disassembly And Assembly
      • Cleaning And Inspection
    • STANDARD INSTRUMENT PANEL
      • Removal And Installation
    • FRONT LIGHTS
      • Removal And Installation
    • RELAY SWITCHES
      • Location
  • ENGINE SERVICE
    • TROUBLESHOOTING
    • ENGINE SPEED CONTROL
      • Removal And Installation
      • Disassembly
    • RADIATOR
      • Removal And Installation
    • COOLANT RECOVERY TANK
      • Removal And Installation
    • ENGINE MUFFLER
      • Removal And Installation
    • AIR CLEANER HOUSING
      • Removal And Installation
    • BLOWER HOUSING/FAN GEARBOX
      • Removal And Installation
    • FAN DRIVE TENSION PULLEY
      • Removal And Installation
    • BLOWER FAN
      • Removal And Installation
    • FAN GEARBOX
      • Parts Identification
      • Disassembly
      • Assembly
      • Checking Backlash
    • ENGINE
      • Removal And Installation
      • Engine Mount Replacement
    • FLYWHEEL
      • Removal And Installation
      • Flywheel Ring Gear
    • BELT SHIELD
      • Removal And Installation
    • VALVE CLEARANCE
      • Adjustment
    • ENGINE COMPRESSION
      • Checking
    • GLOW PLUGS
      • Removal And Installation
      • Checking The Glow Plugs
    • FUEL INJECTION PUMP
      • Description
      • Removal And Installation
      • Timing The Injection Pump
    • FUEL INJECTOR NOZZLES
      • Removal And Installation
      • Checking
    • CYLINDER HEAD
      • Removal And Installation
      • Cylinder Head Surface Alignment
      • Exhaust Manifold
    • VALVES, VALVE SEAT AND GUIDE
      • Removal
      • Installation
      • Reconditioning The Valve And Valve Seats
      • Valve Seat Insert
      • Valve Guide
      • Valve Spring
    • ROCKER ARM AND SHAFT
      • Disassembly And Assembly
      • Checking Rocker Arm And Push Rods
    • PISTON AND CONNECTING ROD
      • Removal
      • Disassembly
      • Checking
      • Assembly
      • Installation
    • CYLINDER LINERS
      • Checking The Cylinder Bore
      • Removal
      • Installation
    • MAIN BEARINGS
      • Description
      • Removal
      • Installation
      • Crankshaft End Play
    • CRANKSHAFT
      • Removal And Installation
      • Checking Tuffriding (Soft Nitriding) Coating
      • Checking the Crankshaft
    • CRANKSHAFT GEAR
      • Removal And Installation
    • TIMING GEARCASE COVER SEAL
      • Removal And Installation
    • TIMING GEARCASE COVER
      • Removal And Installation
    • IDLER GEAR AND HUB
      • Removal
      • Checking
      • Installation
    • FUEL INJECTION PUMP IDLER GEAR
      • Removal And Installation
      • Bearing Installation
    • CAMSHAFT GEAR
      • Removal And Installation
    • TIMING GEARCASE
      • Removal And Installation
    • CAMSHAFT
      • Removal And Installation
      • Checking
      • Camshaft Bearings
      • Tappets
      • Tappet Installation
    • OIL PAN
      • Removal
      • Installation
    • OIL PUMP
      • Removal And Installation
      • Checking
      • Gear Replacement
      • Rotor Replacement
      • Oil Pump Relief Valve
      • Oil Filter Housing And Block
    • WATER PUMP
      • Removal And Installation
      • Disassembly
      • Assembly
    • THERMOSTAT
      • Removal And Installation
      • Checking The Thermostat
    • WATER JACKET TUBE
      • Removal And Installation
  • SYSTEMS ANALYSIS
    • BOBCAT INTERLOCK CONTROL SYSTEM (BICS™)
      • Inspecting The BICS System Controller (Engine STOPPED – Key ON)
      • Inspecting The Seat And Seat Bar Sensors (Engine RUNNING)
      • Inspecting The Traction Lock (Engine RUNNING)
      • Inspecting The Lift Arm By–Pass Control
      • Maintenance
      • Troubleshooting Chart
      • Troubleshooting Guide
        • BICS SYSTEM 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
    • BOSS® DIAGNOSTIC TOOL
      • Procedure
    • SENDER AND SENSOR
      • Service Checks
      • Component
    • RPM SENSOR
      • Adjustment
    • MONITOR SERVICE CODES
    • TROUBLESHOOTING THE BOSS® & LCD DISPLAY
    • OPERATION SENSING SYSTEM UNIT
      • Removal And Installation
    • BOSS® INSTRUMENT PANEL
      • Removal And Installation
    • PWM MODULE
      • Description
    • PWM TROUBLESHOOTING
      • Conditions
      • Chart
    • PWM CONTROL HANDLE
      • Handle Testing
    • PWM ELECTRIC SOLENOID
      • Solenoid Coil Testing
    • ELECTRICAL/HYDRAULIC CONTROLS REFERENCE
      • Controls Identification Chart
  • SPECIFICATIONS
    • LOADER SPECIFICATIONS
      • LOADER DIMENSIONS
      • OPERATION & PERFORMANCE
      • ENGINE
      • HYDRAULIC SYSTEM
      • ELECTRICAL
      • DRIVE SYSTEM
      • CAPACITIES
      • TIRES
      • VIBRATION DATA
    • ENGINE SPECIFICATIONS
      • Cylinder Head
      • Valve, Valve Guide & Seat Insert
      • Valve Springs
      • Rocker Arm
      • Tappets
      • Piston, Pin & Rings
      • Connecting Rod & Bearing
      • Cylinder Liners
      • Camshaft
      • Crankshaft
      • Idler Gear
      • Oil Pump
      • Fuel System
      • Torque For General Metric Bolts
    • TORQUE SPECIFICATIONS FOR LOADER
    • HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
    • STANDARD TORQUE SPECIFICATIONS FOR BOLTS
    • DECIMAL AND MILLIMETER EQUIVALENTS
    • U.S. TO METRIC CONVERSION
  • SERVICE MANUAL REVISIONS
    • 850–001
    • 850–002
    • 850–003
    • 850–004
    • 850–005
    • 850-006

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