Bobcat 843, 843B Skid-Steer Loader Service Manual – 6566091 (12-85)

This workshop repair service manual PDF download for the 843 & 843B Bobcat Skid-Steer Loader has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to fully at every opportunity.

APPLICABLE MODELS :

Bobcat Loader 843
Bobcat Loader 843B

TABLE OF CONTENTS :

FOREWORD
SAFETY INSTRUCTIONS
SERIAL NUMBER LOCATIONS
DELIVERY REPORT
BOBCAT LOADER IDENTIFICATION
PREVENTIVE MAINTENANCE
HYDRAULIC SYSTEM
HYDROSTATIC SYSTEM
DRIVE SYSTEM
MAIN FRAME
ELECTRICAL SYSTEM
ENGINE SERVICE
SPECIFICATIONS
SERVICE MANUAL REVISIONS

MANUAL SPECIFICATION :

File Format : PDF
Language : English
Printable : Yes
Searchable : Yes
Bookmarked : Yes
P/N : 6566091 (12-85)
Total Pages : 545

This 843 Bobcat Loader Manual PDF Download contains specs, diagrams, actual real photo illustrations, and schemes. In addition to space savings, nice thing about having completly searcheble PDF files instead of a hard-printed manual is that you can use the Search feature in your PDF reader software (Adobe Acrobat) to find just what your looking for and just print out the exact pages you need or all manual easily. This is the same manual your local dealer will use when doing a repair. This is a must for the Do-It-Yourselfer! Saving Yourself $$$$$$ In Service Repair And Maintenance Costs !!!!

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MAINTENANCE SAFETY
CONTENTS
FOREWORD
SAFETY INSTRUCTIONS
FIRE PREVENTION
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 BOBCAT LOADER
Procedure
LIFT ARM STOP
Procedure
OPERATOR CAB
Seat Bar System
Seat Bar Inspection
Seat Bar Maintenance
Raising The Operator Cab
Lowering The Operator Cab
USING AN EXTRA BATTERY (JUMP STARTING)
Procedure
REMOTE START SWITCH
Procedure

HYDRAULIC SYSTEM
HYDRAULIC / HYDROSTATIC SCHEMATICS
TROUBLESHOOTING
HYDRAULIC SYSTEM INFORMATION
Flare Connections
Straight Thread O-Ring Fitting
Tubelines And Hoses
LIFT CYLINDER
Checking The Lift Cylinder(s)
Removal And Installation
TILT CYLINDERS
Checking The Tilt Cylinder
Removal And Installation
Rod End Seal
TILT CYLINDER (CESSNA)
Disassembly
Assembly
HYDRAULIC CYLINDER REPAIR
Disassembly
Assembly
HYDRAULIC CONTROL VALVE (CESSNA)
Checking The Main Relief Valve
Main Relief Valve Removal And Installation
Removal And Installation
Disassembly
Inlet Section
Tilt Section
Lift Section
Auxiliary Section
Valve Spool Bolt
Assembly
HYDRAULIC CONTROL VALVE (MELROE)
Checking The Main Relief Valve
Main Relief Valve Removal And Installation
Removal And Installation
Disassembly And Assembly
Detent Assembly
Centering Mechanism
HYDRAULIC PUMP (SINGLE STAGE)
Checking The Output Of The Hydraulic Pump
Removal And Installation
Disassembly And Assembly
Inspection
HYDRAULIC PUMP (DOUBLE STAGE)
Removal And Installation
Disassembly And Assembly
Inspection
BUCKET POSITION VALVE (S/N 15001 & ABOVE)
Removal And Installation
Disassembly And Assembly
PORT BLOCK (S/N 14999 & BELOW)
40 Micron Filter (Bronze)
Neutral By-Pass Valve
Removal And Installation
PORT BLOCK (S/N 15001 & ABOVE)
Removal And Installation
Charge By-Pass
Cold Oil By-Pass
HYDRAULIC FLUID FILTER HOUSING (S/N 15001 & ABOVE)
Removal And Installation
By-Pass Valve
HYDRAULIC/HYDROSTATIC RESERVOIR (S/N 21514 & BELOW)
Removal And Installation
HYDRAULIC CONTROL PEDALS (S/N 14999 & BELOW)
Removal And Installation
Adjustment
HYDRAULIC CONTROL PEDALS (S/N 15001 & ABOVE)
Removal And Installation
Adjustment
PEDAL LOCK LINKAGE
Adjustment

HYDROSTATIC SYSTEM
TROUBLESHOOTING
HYDROSTATIC SYSTEM INFORMATION
High Pressure Relief/Replenishing Valves Function
FRONT AND SIDE PANELS (S/N 19999 & BELOW)
Removal And Installation
STEERING LEVERS (S/N 16191 & BELOW)
Removal And Installation
Repairing The Steering Levers
Steering Linkage Adjustment
Removal And Installation
RepairingThe Pintle Lever
FRONT AND SIDE PANEL (ONE PIECE) (S/N 20001 & ABOVE) & 843B
Removal And Installation
STEERING LEVERS – 843-(S/N 16192 THRU 25999), 843-(STARTING WITH S/N 34222) & 843B
Removal And Installation
Repairing The Steering Levers
STEERING LINKAGE 843-(S/N 16192 THRU 25999), 843-(STARTING WITH S/N 34222) & 843B
Steering Linkage Adjustment
Removal And Installation
Repairing The Pintle Lever
STEERING LINKAGE (S/N 26000 THRU 29869)
Description
Neutral Adjustment
Steering Lever Centering Spring Mechanism
Removal And Installation (Creep Mechanism)
SERVO CONTROL
Removal And Installation
Disassembly And Assembly
PINTLE LEVER ARMS (S/N 26000 – 29869)
Removal And Installation
STEERING LINKAGE (S/N 29870 – 31863)
Description
Neutral Adjustment
Steering Lever Centering Spring Mechanism
Creep Centering Spring Mechanism
Pintle Arm
STEERING LINKAGE (S/N 31864-34221)
Hydrostatic Pump Centering Spring Adjustment
Servo Control Unit Adjustment
Steering Lever Centering Spring Adjustment
Wheel RPM Adjustment (Left To Right)
HYDROSTATIC MOTOR
Removal And Installation
Disassembly And Assembly
Inspection
Timing The Hydrostatic Motor
High Pressure Hose Routing
HYDROSTATIC PUMPS
Checking The High Pressure Relief/Replenishing Valve
Checking Charge Pressure
Removal And Installation
Disassembly And Assembly
Rear Pump
Front Pump
Inspection
Tow Valves
Hydrostatic Pump Rear Mount (S/N 21574 & Above)
HYDROSTATIC FLUID FILTER HOUSING
Removal And Installation

DRIVE SYSTEM
PARKING BRAKE
Adjustment
Removal And Installation
Block And Pucks
AXLES, SEALS AND BEARINGS
Removal
Installation
FINAL DRIVE CHAIN
Removal
Installation
REDUCTION GEARCASE
Removal And Installation
Checking Reduction Gearcase
Disassembly And Assembly
Installation
Reduction Gearcase Seal

MAIN FRAME
OPERATOR CAB (S/N 19999 & BELOW)
Removal And Installation
OPERATOR CAB (S/N 20001 & ABOVE)
Removal And Installation
OPERATOR CAB GAS CYLINDER
Removal And Installation
REAR DOOR
Door Latch Adjustment
Removal And Installation
LIFT ARMS
Removal And Installation
BOB-TACH
Removal And Installation
Tilt Cylinder Rod End Seal
Disassembly And Assembly
FUEL TANK (S/N 19999 & BELOW)
Removal And Installation
FUEL TANK (S/N 20001 & ABOVE)
Removal And Installation
Fuel Tank Sender Switch

ELECTRICAL SYSTEM
ELECTRICAL SCHEMATICS
ELECTRICAL SYSTEM INFORMATION
Description
TROUBLESHOOTING
BATTERY
Checking The Battery
Removal And Installation
ALTERNATOR
Alternator Belt Adjustment
Checking The Alternator Wire Harness
Checking Alternator Output
Checking Alternator Regulator
Removal And Installation
Disassembly And Assembly
MELROE ALTERNATOR
Checking The Alternator Output
Checking The Alternator Regulator
Removal And Installation
Disassembly And Assembly
MANDO ALTERNATOR
STARTER
Checking The Starter
Removal And Installation
Disassembly And Assembly
Cleaning And Inspection
Replacing The Brushes

ENGINE SERVICE
ENGINE SERVICE (PERKINS ENGINE)
TROUBLESHOOTING
VALVE CLEARANCE
Adjustment
ENGINE COMPRESSION
Checking
FUEL FILTER
Removal And Installation
Water Trap
FUEL LIFT PUMP
Checking
Removal And Installation
REMOVING AIR FROM FUEL SYSTEM
Procedure
FUEL INJECTION PUMP
Removal And Installation
ENGINE TIMING TO INJECTION PUMP (USING DIAL INDICATOR)
Procedure
EMGINE TIMING TO INJECTOR PUMP (USING TIMING TOOL)
Procedure
CHECKING TIMING MARK ON INJECTION PUMP FLANGE
Procedure
FUEL INJECTOR NOZZLES
Removal And Installation
Checking
ENGINE
Removal And Installation
RADIATOR
Removal And Installation
OIL COOLER
Removal And Installation
ENGINE MUFFLER
Removal And Installation
ENGINE BLOWER HOUSING
Removal And Installation
ENGINE FLYWHEEL & U-JOINT
Removal And Installation
Flywheel Ring Gear
CYLINDER HEAD
Removing The Cylinder Head
Cylinder Head Surface Alignment
Installing The Cylinder Head
VALVES
Removal Of The Valves
Installing The Valves
Reconditioning The Valves And Valve Seats
Installing Valve Guides
Changing The Valve Springs
COMBUSTION CHAMBER INSERTS
Removal And Installation
ROCKER ARMS
Disassembly
Assembly
PISTON AND CONNECTING RODS
Removal
Disassembly
Inspection
Installation
CYLINDER LINERS
Checking
Removal And Installation
MAIN BEARINGS
Removal
Installation
Crankshaft End Play
CRANKSHAFT
Removal
Checking
Installation
REAR MAIN OIL SEAL
Removal And Installation
TIMING CASE COVER
Removal And Installation
IDLER GEAR AND HUB
Removal
Installation
CAMSHAFT GEAR
Removal
Installation
FUEL INJECTION PUMP DRIVE GEAR
Removal And Installation
CRANKSHAFT GEAR
Removal
TIMING CASE
Removal And Installation
CAMSHAFT AND TAPPETS
Removal
Inspection
Installation
LUBRICATION SYSTEM
Description
OIL PUMP
Removal And Installation
Disassembly And Assembly
Checking
WATER PUMP
Removal And Installation
Disassembly
Checking
Assembly
THERMOSTAT
Removal
Testing The Thermostat
Installation
ENGINE SERVICE (PERKINS ENGINE – 200 SERIES)
TROUBLESHOOTING
VALVE CLEARANCE
Adjustment
ENGINE COMPRESSION
Checking
FUEL FILTER (S/N 13315 & BELOW)
Removal And Installation
Water Trap
FUEL FILTER (S/M 13316 & ABOVE)
Removal And Installation
REMOVING AIR FROM THE FUEL SYSTEM (S/N 13315 & BELOW)
Procedure
REMOVING AIR FROM THE FUEL SYSTEM (S/N 13316 & ABOVE)
Procedure
FUEL INJECTION PUMP
Removal And Installation
Maximum Speed Setting
TIMING THE FUEL INJECTION PUMP
Procedure
FUEL INJECTOR NOZZLES
Removal And Installation
Checking
GLOW PLUGS
Checking
ENGINE
Removal And Installation
RADIATOR
Removal And Installation
OIL COOLER
Removal And Installation
ENGINE MUFFLER
Removal And Installation
ENGINE BLOWER HOUSING
Removal And Installation
ENGINE FLYWHEEL & U-JOINT
Removal And Installation
Flywheel Ring Gear
CYLINDER HEAD
Removing The Cylinder Head
Cylinder Head Surface Alignment
Installing The Cylinder Head
VALVES
Removing The Valves
Installing The Valves
Reconditioning The Valves And Valve Seats
Installing The Valve Guides
Checking The Valve Springs
CONBUSTION CHAMBER INSERTS
Removal And Installation
ROCKER ARMS
Disassembly
Assembly
PISTON AND CONNECTING RODS
Removal
Disassembly
Inspection
Installation
CYLINDER LINERS
Checking
Removal And Installation
MAIN BEARINGS
Removal
Installation
Crankshaft End Play
CRANKSHAFT
Removal
Installation
REAR MAIN OIL SEAL
Removal And Installation
TIMING CASE COVER
Removal And Installation
Front Seal
IDLER GEAR AND HUB
Removal
Installation
CAMSHAFT GEAR
Removal
Installation
FUEL INJECTION PUMP DRIVE GEAR
Removal And Installation
CRANKSHAFT GEAR
Removal
TIMING CASE
Removal And Installation
CAMSHAFT AND TAPPETS
Removal
Inspection
Installation
LUBRICATION SYSTEM
Description
OIL PUMP
Removal And Installation
Inspection
OIL FILTER ADAPTER HOUSING
Removal And Installation
WATER PUMP
Removal And Installation
Disassembly
Checking
Assembly
THERMOSTAT
Removal
Testing The Thermostat
Installation
ENGINE SERVICE (ISUZU ENGINE)
TROUBLESHOOTING
VALVE CLEARANCE
Adjustment
ENGINE COMPRESSION
Checking
FUEL FILTER
Water Trap
Fuel Filter Element
REMOVING AIR FROM FUEL SYSTEM
Procedure
FUEL INJECTION PUMP
Removal And Installation
ENGINE TIMING TO INJECTION PUMP
Procedure
FUEL INJECTOR NOZZLES
Removal And Installation
Checking
GLOW PLUGS
Removal And Installation
ENGINE OIL AND FILTER
Removal And Installation
ENGINE
Removal And Installation
RADIATOR
Removal And Installation
OIL COOLER
Removal And Installation
ENGINE MUFFLER
Removal And Installation
ENGINE FLYWHEEL & U-JOINT
Removal And Installation
Flywheel Ring Gear
ENGINE BLOWER HOUSING
Removal And Installation
ENGINE MOUNTS
Removal And Installation
CYLINDER HEAD
Removal And Installation
Cylinder Head Surface Alignment
Exhaust Manifold
VALVES
Removal And Installation
Reconditioning The Valves And Valve Seats
Valve Seat Insert
Valve Guides
Valve Springs
ROCKER ARMS
Disassembly And Assembly
Push Rods
PISTON AND CONNECTING ROD
Removal
Disassembly
Inspection
Assembly
Installation
CYLINDER LINERS
Checking
Removal
Installation
MAIN BEARINGS
Removal
Installation
Crankshaft End Play
CRANKSHAFT
Removal
Checking Tuffriding (Soft Nitriding) Coating
Checking
Crankshaft Gear
Removal And Installation
Installation
TIMING CASE COVER SEAL
Removal And Installation
TIMING CASE COVER
Removal And Installation
IDLER GEAR AND HUB
Removal And Installation
Checking
FUEL INJECTION PUMP IDLER GEAR
Removal And Installation
Bearing Installation
CAMSHAFT GEAR
Removal And Installation
TIMING CASE
Removal And Installation
CAMSHAFT
Removal And Installation
Checking
Camshaft Bearing
Tappets
Installation
OIL PAN
Removal
Installation
OIL PUMP
Removal And Installation
Checking
Gear Replacement
Rotor Replacement
Oil Pump Relief Valve
WATER PUMP
Removal And Installation
Disassembly
Assembly
THERMOSTAT
Removal And Installation
Inspection
WATER JACKET TUBE
Removal And Installation

TECHNICAL DATA
GENERAL SPECIFICATIONS
TORQUE SPECIFICATIONS
Seat Bar, Fuel Tank & Panel Group
Steering Levers, Linkage & Pedal Group
Brakem Axle & Chaincase Group
Operator Guard, Lift Arm & Main Frame Group
Hydraulic/Hydrostatic Group
Engine Group (Perkins)
Engine Group (200 Series Perkins)
Engine Group (Isuzu)
HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
DECIMAL AND MILLIMETER EQUIVALENTS
U.S. TO METRIC CONVERSION
STANDARD TORQUE SPECIFICATIONS FOR BOLTS
TECHNICAL DATA (PERKINS ENGINE)
LOADER SPECIFICATIONS
Specifications
Engine
Loader Hydraulics
Electrical
Drive System
Capacities
Tires
ENGINE SPECIFICATIONS
Cylinder Head Dimensions
Piston And Connecting Rod Dimensions
Cylinder Block And Liner Dimensions
crankshaft And Main Bearings Dimensions
Timing Case, Camshaft And Drive Dimensions
Oil Pump Dimensions
Cooling System and Wster Pump Dimensions
Fuel System Specifications
De-Rating For Altitude
Engine Torque
Grinding Specifications For Crankshaft
TECHNICAL DATA (PERKINS ENGINE – 200 SERIES)
LOADER SPECIFICATIONS
Specifications
Engine
Loader Hydraulics
Electrical
Drive System
Capacities
Tires
ENGINE SPECIFICATIONS
Cylinder Head Dimensions
Pistons And Connecting Rod Dimensions
Cylinder Block And Liner Dimensions
Crankshaft And Main Bearing Dimensions
Timing Case, Camshaft And Drive Dimensions
Oil Pump Dimensions
Cooling System And Water Pump Dimensions
Fuel System Specifications
De-Rating For Altitude
Engine Torques
Grinding Specifications For Crankshaft
TECHNICAL DATA (iSUZU ENGINE)
LOADER SPECIFICATIONS
Operation And Performance
Engine
Loader Hydraulics
Electrical
Drive System
Capacities
Tires
ENGINE SPECIFICATIONS
Cylinder Head
Valve, Vale Guide And Seat Insert
Valve Springs
Rocker Arm
Tappets
Piston, Pin And Rings
Connecting Rod & Bearing
Cylinder Liners
Camshaft
Crankshaft
Idler Gear
Oil Pump
Fuel System
Engine Torque

SERVICE MANUAL REVISIONS
843-1
843-2
843-3
843-4
843-5
843-6
843-7
843-8
843-9
843-10
843-11
843-12
843-13
843-14
843-15
843-16

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