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Bobcat 853 Loader Service Manual (SN 512815001-512815999)

Format: PDF (Printable Document)

File Language: English

File Pages: 398

File Size: 10.41 MB (Speed Download Link)

Brand: Bobcat

Model: 853 Loader

Book No: 6720755

Serial No: SN 512815001-512815999

Type of Document: Service Manual

Categories: ,

$ 45

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Bobcat 853 Loader Service Manual (SN 512815001-512815999)

The Bobcat 853 is a mid-size skid-steer loader you'll see on small dirt jobs, farmyards, and tight-site construction, doing pallet work, grading, and attachment work all day. The people who reach for this service manual are the ones actually tearing into the machine: shop mechanics, field techs, and owner-operators who are past warranty. They're trying to track down hydraulic issues, fix drive problems, and put engines and pumps back together without guessing. If that sounds like what you're doing with an 853 in the serial range listed, you're looking at the right kind of book.

What this manual helps you do

  • Diagnose low power, drive, or hydraulic issues by checking pressures, flows, and control linkages on the 853.
  • Trace and repair electrical faults using wiring diagrams for this exact serial number block.
  • Follow step-by-step teardown and reassembly on major components like the hydrostatic drive, cylinders, and the loader linkage.
  • Replace and adjust engine, drive, and hydraulic parts with the correct sequences and spec references.
  • Set and verify machine adjustments after repairs so the loader runs straight, lifts right, and doesn't cook the oil.

Who this is for

This manual is for anyone working on a Bobcat 853 loader in the 512815001-512815999 serial range: small contractors, farm shops, independent mechanics, or rental fleets. If you just need to learn the controls or daily checks, you want the operator's handbook instead, not this service manual.

FAQ

Q: Is this a searchable PDF, and can I read the wiring diagrams clearly?

A: These manuals are usually scanned or native PDFs that you can search, and wiring diagrams are generally clear enough to zoom and print.

Q: My 853 has a different serial number. Will this still match my machine?

A: No, this one is aimed at 512815001-512815999. If your serial tag is outside that, you should look for the correct range.

Q: I'm only doing basic maintenance. Is this overkill?

A: For oil, filters, and grease points, it's more than you need. For real repair work or diagnostics, this is the right document type.

Bottom line: If you're repairing or diagnosing a Bobcat 853 in the 512815001-512815999 range, this is the correct service manual. If your serial tag doesn't match, 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
    • 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
      • Inspecting The Seat Bar
      • Maintaining The Seat Bar
    • 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
      • Checking The Coolant Level
      • Cleaning The Cooling System
      • Replacing The Coolant
    • ALTERNATOR BELT
      • Adjusting The Alternator Belt
    • HYDRAULIC/HYDROSTATIC SYSTEM
      • Checking And Adding Fluid
      • Replacing Hydraulic/Hydrostatic Filters
      • Replacing The 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
    • FAN GEARBOX
      • Checking And Maintaining
    • LUBRICATING THE LOADER
      • Procedure
    • REMOTE START SWITCH
      • Procedure
  • HYDRAULIC SYSTEM
    • HYDRAULIC/HYDROSTATIC SCHEMATICS
    • TROUBLESHOOTING
    • HYDRAULIC SYSTEM INFORMATION
      • Tighten Procedures
    • LIFT CYLINDER(S)
      • Checking The Lift Cylinder
      • Removal And Installation
    • TILT CYLINDER
      • Checking The Tilt Cylinder
        • 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 (S/N 512811001 & Above) W/ Select Valve (JEM)
      • Checking The Low Setting
      • Checking The High Setting
      • Adjusting The Low Setting
      • Adjusting The High Setting
    • HYDRAULIC CONTROL VALVE
      • Removal And Installation
    • SELECT VALVE (S/N 512811001 & Above) W/SelectValve (JEM)
      • Checking The Relief Valve
      • Removal And Installation
      • Disassembly And Assembly
      • Solenoid Testing
    • HYDRAULIC FILTER HOUSING
      • Removal And Installation
    • HYDRAULIC PUMP
      • Checking The Output Of The Pump
      • Removal And Installation
    • HYDRAULIC FLUID RESERVOIR
      • Removal And Installation
    • LOCK VALVE (S/N 5103)
      • Removal And Installation
    • BUCKET POSITION VALVE (S/N 5102) & (S/N 5103)
      • Removal And Installation
    • FRONT AUXILIARY CONTROL VALVE (Apitech)
      • 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
      • Tow Valves
    • FRONT PANEL
      • Removal And Installation
    • STEERING LEVERS
      • Disassembly And Assembly
      • Neutral 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 Pump Neutral Adjustment
    • HYDROSTATIC MOTOR
      • Removal And Installation
    • HYDROSTATIC CHARGE OIL FILTER
      • Removal And Installation
    • COLD OIL BY–PASS VALVE
      • Removal And Installation
    • HYDROSTATIC PUMP
      • Removal And Installation
      • Replenishing/High Pressure Relief Valve
    • DRIVE BELT SHIELD
      • Removal And Installation
    • DRIVE BELT
      • Replacing The Drive Belt
    • SPRING LOADED TENSIONER PULLEY
      • Parts Identification
      • Disassembly
      • Assembly
      • Adjusting The Drive Belt
    • FIXED TENSIONER PULLEY
      • Removal And Installation
      • Disassembly
      • Assembly
      • Checking Pulley End Play
      • Adjusting The Drive Belt
    • OIL COOLER
      • Removal And Installation
  • DRIVE SYSTEM
    • PARKING BRAKE PEDAL
      • Adjustment
    • PARKING BRAKE
      • Removal And Installation
      • Brake Block And Pads
      • Brake Discs
    • 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
    • OPERATOR CAB GAS CYLINDER
      • Removal And Installation
      • Disassembly And Assembly
    • OPERATOR CAB
      • 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
    • BATTERY
      • Removal And Installation
      • Servicing The Electrical System
      • Using A Booster Battery (Jump Starting)
    • ALTERNATOR
      • Alternator Output Test
      • Rectifier (Diode) Test
      • Alternator Regulator Test
      • Removal And Installation
      • Disassembly
      • Stator Continuity Test
      • Stator Ground Test
      • Rotor Continuity Test
      • Rotor Ground Test
      • Rectifier Continuity (Diode) Test
      • Assembly
    • STARTER
      • Checking The Starter
      • Removal And Installation
      • Parts Identification
      • Disassembly And Assembly
      • Cleaning And Inspection
    • STANDARD INSTRUMENT PANEL
      • Removal And Installation
    • FRONT LIGHTS
      • Removal And Installation
    • STEERING LEVER CONTROL HANDLE (Early Series)
      • Disassembly And Assembly
  • ENGINE SERVICE
    • TROUBLESHOOTING
    • ENGINE SPEED CONTROL
      • Removal And Installation
    • ENGINE MUFFLER
      • Removal And Installation
    • AIR CLEANER HOUSING
      • Removal And Installation
    • COOLANT RECOVERY TANK
      • Removal And Installation
    • RADIATOR
      • Removal And Installation
    • FAN DRIVE TENSION PULLEY
      • Removal And Installation
    • FAN GEARBOX/BLOWER HOUSING
      • Removal And Installation
    • FAN GEARBOX
      • Parts Identification
      • Disassembly
      • Assembly
      • Checking Backlash
    • ENGINE
      • Removal And Installation
    • FLYWHEEL
      • Removal And Installation
      • Flywheel Ring Gear
    • BELT SHIELD
      • Removal And Installation
    • ENGINE MOUNTS
      • Removal And Installation
    • GLOW PLUGS
      • Checking The Glow Plugs
      • Removal And Installation
    • VALVE CLEARANCE
      • Adjustment
    • ENGINE COMPRESSION
      • Checking
    • FUEL INJECTION PUMP
      • Description
      • Removal And Installation
      • Timing The Injection Pump
    • FUEL INJECTOR NOZZLES
      • Checking
      • Removal And Installation
    • 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 The Crankshaft
    • CRANKSHAFT GEAR
      • Removal And Installation
    • TIMING GEARCASE COVER SEAL
      • Removal And Installation
    • TIMING GEARCASE COVER
      • Removal And Installation
    • IDLER GEAR AND HUB
      • 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
  • SYSTEM ANALYSIS
    • BOSS® DIAGNOSTIC TOOL
      • Procedure
    • SENDER AND SENSOR
      • Service Checks
      • Component
    • RPM SENSOR
      • Adjustment
    • SERVICE CODES
      • Chart
    • TROUBLESHOOTING THE BOSS® & LCD DISPLAY
    • BOSS® UNIT
      • Removal And Installation
    • BOSS® INSTRUMENT PANEL
      • Removal And Installation
  • SPECIFICATIONS
    • LOADER SPECIFICATIONS
      • Loader Dimensions
      • Performance
      • Controls
      • Engine
      • Hydraulic System
      • Electrical
      • Drive System
      • Capacities
      • Tires
    • 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 SPECIFICATIONS FOR LOADER
    • TORQUE SPECIFICATIONS FOR BOLTS
      • Torque For General SAE Bolts
      • Torque For General Metric Bolts
    • HYDRAULIC CONNECTION SPECIFICATIONS
      • O–ring Face Seal Connection
      • Straight Thread O–ring Fitting
      • Tubelines And Hoses
      • Flare Fitting
      • O–ring Flare Fitting
      • Port Seal Fitting
    • HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
    • DECIMAL AND MILLIMETER EQUIVALENTS
    • U.S. TO METRIC CONVERSION
  • SERVICE MANUAL REVISIONS
    • 850–001
    • 850–002
    • 850–003
    • 850–004
    • 850–005
    • 850–006
    • 850–007
    • 850–008
    • 850–009
    • 850–010
    • 850–011
    • 850–012
    • 850–13
    • 850-14
    • 850-15

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