Bobcat 753, 753H Skid-Steer Loader Repair Service Manual – 6900090

(S/N: 508630001 & Above – S/N: 511476001 & Above – S/N: 512716001 & Above – S/N: 513911001–513911148 – S/N: 515811001–515829999 – S/N: 516211001–516219999)
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This workshop repair service manual PDF download for the 753, 753H 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 753, 753H BICS
INCLUDES HIGH FLOW OPTION
S/N: 508630001 & Above
S/N: 511476001 & Above
S/N: 512716001 & Above
S/N: 513911001–513911148
S/N: 515811001–515829999
S/N: 516211001–516219999

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
SYSTEMS ANALYSIS
SPECIFICATIONS
ADVANCE HAND CONTROL SYSTEM
SERVICE MANUAL REVISIONS

MANUAL SPECIFICATION :

File Format : PDF
Language : English
Printable : Yes
Searchable : Yes
Bookmarked : Yes
P/N : 6900090 (6–97)
Total Pages : 568

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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
Emergency Exit
SEAT BAR RESTRAINT SYSTEM (Foot Pedals)
Description
Seat Bar Inspection
Seat Bar Maintenance
SEAT BAR RESTRAINT SYSTEM (Mechanical Hand Controls)
Description
Seat Bar Inspection
Seat Bar Maintenance
SEAT BAR RESTRAINT SYSTEM (Advanced Hand Controls)
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
Oil Chart
Replacing Oil And Filter
ENGINE COOLING SYSTEM
Cleaning The Cooling System
Checking The Coolant Level
Replacing The Coolant
ALTERNATOR BELT
Adjusting
FAN GEARBOX
Checking And Maintaining
HYDRAULIC/HYDROSTATIC SYSTEM
Checking And Adding Fluid
Replacing Hydraulic/Hydrostatic Filter
Replacing Hydraulic Fluid
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 The Fixed Drive Idler
Adjusting the Drive Belt Equipped With The Spring Loaded Drive Idler
Replacing The Drive Belt
LUBRICATION OF THE BOBCAT LOADER
Procedure
PIVOT PINS
BOB–TACH
Inspection and Maintenance
REMOTE START SWITCH
Procedure

HYDRAULIC SYSTEM
HYDRAULIC/ HYDROSTATIC SCHEMATICS
TROUBLESHOOTING
HYDRAULIC SYSTEM INFORMATION
Tighten Procedures
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
BICS™ VALVE (S/N 508694509 & Above, S/N 512727421 & Above, S/N 515811001 & Above & S/N 516211001 & Above)
Removal
Lift Arm By–Pass Orifice Disassembly
Check Valve Disassembly
Lock Valve Disassembly
BICS™ Valve Solenoid Disassembly
BICS™ Valve Solenoid Assembly
Lock Valve Assembly
Check Valve Assembly
Lift Arm By–Pass Orifice Assembly
Installation
CONTROL VALVE (S/N 508694509 & Above, S/N 512727421 & Above, S/N 515811001 & Above & S/N 516211001 & Above)
Removal And Installation
Identification Chart
Disassembly
Lift Base End Restrictor Disassembly
Load Check Valve Disassembly
Main Relief Valve Disassembly
Port Relief Valve Disassembly
Anti–Cavitation Valve Disassembly
Rubber Boot Disassembly
Lift Spool And Detent Disassembly
Tilt Spool And Centering Spring Disassembly
Auxiliary Spool Disassembly
Auxiliary Electric Solenoid Disassembly
Port–Auxiliary Section Disassembly
Port–Auxiliary Section Assembly
Auxiliary Electric Solenoid Assembly
Auxiliary Spool Assembly
Tilt Spool And Centering Spring Assembly
Lift Spool And Detent Assembly
Rubber Boot Assembly
Anti–Cavitation Valve Assembly
Port Relief Valve Assembly
Main Relief Valve Assembly
Load Check Valve Assembly
Spool Seal Installation
Cleaning And Inspection
CONTROL VALVE (S/N 508694508 & Below, S/N 512727420 & Below, S/N 511476001 & Above, S/N 5086300001 & Above & S/N 513911001 & Above)
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 And Installation Of Spool Seal
MAIN RELIEF VALVE
Checking
Adjustment
Removal And Installation
MAIN RELIEF VALVE (753H)
Checking The Dual Pressure (Low Setting)
Checking The Dual Pressure (High Setting)
Adjusting The Dual Pressure (Low Setting)
Adjusting The Dual Pressure (High Setting)
HYDRAULIC PUMP
Removal And Installation
Checking The Output Of The Hydraulic Pump
Checking The Output Of The HIgh Flow Hydraulic Pump (753H)
Disassembly And Assembly
Inspection
Identification
Removal And Installation (753H)
Identification (753H)
Disassembly And Assembly (753H)
HYDRAULIC FILTER HOUSING
Removal And Installation
HYDRAULIC FLUID RESERVOIR
Removal And Installation
CONTROL PEDALS
Removal And Installation
Pedal Adjustment
SELECT VALVE (753H)
Checking the Main Relief Valve in High Horsepower Select Valve
Removal and Installation
Disassembly and Assembly (New Style Valve)
Solenoid Testing (New Style Valve)
Disassembly and Assembly (Old Style Valve)
Solenoid Testing (Old Style Valve)
CONTROL INTERLOCK LINKAGE (Pedal or Mechanical Hand)
Removal And Installation
Adjustment
LIFT LOCK BY–PASS VALVE
Removal And Installation (S/N 508694508 & Below, S/N 512727420 & Below, S/N 511476001 & Above, S/N 508630001 & Above & S/N 513911001 & Above)
Disassembly and Assembly (S/N 508694508 & Below, S/N 512727420 & Below, S/N 511476001 & Above, S/N 508630001 & Above & 513911001 & Above)
Removal And Installation (S/N 508694509 & Above, S/N 512727421 & Above, S/N 515811001 & Above & S/N 516211001 & Above)
Disassembly And Assembly (S/N 508694509 & Above, S/N 512727421 & Above, S/N 515811001 & Above & S/N 516211001 & Above)
TILT LOCK VALVE
Removal And Installation (S/N 508694508 & Below,S/N 512727420 & Below, S/N 511476001 & Above, S/N 508630001 & Above & S/N 513911001 & Above)
Disassembly And Assembly (S/N 508694508 & Below, S/N 512727420 & Below, S/N 511476001 & Above, S/N 508630001 & Above & S/N 513911001 &Above)

HYDROSTATIC SYSTEM
TROUBLESHOOTING
HYDROSTATIC SYSTEM INFORMATION
Replenishing Valve Function
Checking Charge Pressure
CONTROL PANEL
Removal And Installation
Steering Shock 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 (S/N 512716001 & Above, 508695347 & Below, 511476001 & Above, 508630001 & Above & 513911001 & Above)
Disassembly And Assembly (S/N 512716001 & Above, 508695347 & Below, 511476001 & Above, 508630149 & Above & 513911001 & Above)
Inspection
HYDROSTATIC MOTOR
Parts Identification – (S/N 515811001 & Above, 508695348 & Above & 516211001 & Above)
Disassembly (S/N 515811001 & Above, 508695348 & Above & 516211001 & Above)
Assembly (S/N 515811001 & Above, 508695348 & Above & 516211001 & Above)
HYDROSTATIC PUMP
Removal And Installation
Identification
Disassembly And Assembly
Inspection
Swashplate Pre–Load (Earlier Models Only)
DRIVE BELT HOUSING
Removal And Installation
SPRING LOADED DRIVE BELT TENSIONER PULLEY
Removal And Installation
Identification
Disassembly
Assembly
FIXED DRIVE BELT TENSIONER PULLEY
Removal And Installation
Identification
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
TRACTION LOCK GUIDES
Disassembly
Assembly
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 And Installation

MAIN FRAME
SEAT BAR (W/GAS CYLINDER)
Removal And Installation
Assembly
Compressing The Gas Cylinder
SEAT BAR (W/COMPRESSION SPRING)
Removal And Installation
Assembling Components
Compression Spring Disassembly And Assembly
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 (Two Piece Door)
Removal And Installation (One Piece Door)
Hood Removal And Installation (Two Piece Door)
Bumper Removal And Installation (Two Piece Door)
Door Latch Removal And Installation
Door Latch And Catch Adjustment
REAR LIGHTS
Removal and Installation (One Piece Door)

ELECTRICAL SYSTEM
ELECTRICAL SCHEMATICS
TROUBLESHOOTING
ELECTRICAL SYSTEM INFORMATION
Description
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 (DELCO REMY)
Checking The Starter
Parts Identification
Disassembly And Assembly
Cleaning And Inspection
STARTER (DENSO)
Removal And Installation
Parts Identification
Disassembly
Inspection And Repair
No Load Test
Assembly
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
ENGINE MUFFLER
Removal And Installation
BLOWER HOUSING/FAN GEARBOX
Removal And Installation
Tension Pulley Removal And Installation
Blower Fan Disassembly And Assembly
FAN GEARBOX
Identification
Disassembly
Assembly
Checking Backlash
AIR CLEANER
Removal And Installation
ENGINE
Removal And Installation
Engine Mount Replacement
FLYWHEEL
Removal And Installation
Flywheel Ring Gear
ENGINE COMPRESSION
Checking
GLOW PLUGS
Checking The Glow Plugs
Removal And Installation
FUEL INJECTION PUMP
Checking The Injection Pump
Adjusting Shut–Off Linkage
FUEL INJECTION PUMP
Removal And Installation
Timing The Injection Pump
FUEL INJECTOR NOZZLES
Removal And Installation
Checking The Injector Nozzle
CYLINDER HEAD
Removal And Installation
Disassembly And Assembly
Servicing The Cylinder Head
Top Clearance
VALVE, VALVE SEAT AND GUIDE
Checking The Valve Guide
Valve Spring
VALVE CLEARANCE
Adjustment
ROCKER ARM AND SHAFT
Checking
TIMING GEARCASE COVER
Removal And Installation
IDLER GEAR AND CAMSHAFT
Removal And Installation
Servicing The Camshaft
Servicing The Idler Gear And Shaft
TIMING GEARS
Checking Backlash
FUEL CAMSHAFT
Removal And Installation
Governor
CRANKSHAFT GEAR
Removal And Installation
OIL PUMP
Removal And Installation
Oil Pump Service
Checking Engine Oil Pressure
Relief Valve
PISTON AND CONNECTING ROD
Removal And Installation
Servicing The Piston And Connecting Rod
Connecting Rod Alignment
CRANKSHAFT AND BEARINGS
Removal And Installation
Servicing the Crankshaft and Bearings
CYLINDER BORE
Checking The Cylinder Bore
WATER PUMP
Disassembly And Assembly

SYSTEMS ANALYSIS
BICS™ (WITH PRESS TO OPERATE BUTTON)
Inspecting The BICS™ Controller (Engine STOPPED – Key ON)
Inspecting Deactivation Of The Auxiliary Hydraulics System (Engine STOPPED – Key ON)
Inspecting The Seat Bar Sensor (Engine RUNNING)
Inspecting The Traction Lock (Engine RUNNING)
Inspecting The Lift Arm By-Pass Control
Additional Inspection For Loaders With Advanced Hand Controls
Troubleshooting Chart
BICS™ (Without Press To Operate Button)
Inspecting The BICS Controller (Engine STOPPED –Key ON)
Inspecting Deactivation Of The Auxiliary Hydraulics System (Engine STOPPED–Key ON)
Inspecting The Seat And Seat Bar Sensors (EngineRUNNING)
Inspecting The Traction Lock (Engine RUNNING)
Inspecting The Lift Arm By–Pass Control
Maintenance
Troubleshooting Chart
BICS™ SYSTEM CONTROLLER
Troubleshooting Guide
Removal And Installation
SEAT BAR SENSOR
Troubleshooting Guide
Seat Bar Sensor Test
Removal And Installation
BICS™ Controller Seat Bar Sensor Circuit Test
SEAT SENSOR
Troubleshooting Guide
Seat Sensor Test
Removal And Installation
BICS™ Controller Seat Sensor Circuit Test
TRACTION LOCK
Troubleshooting Guide
Removal And Installation
BOSS® DIAGNOSTIC TOOL
Procedure
SENDER AND SENSOR
Service Checks
RPM SENSOR
MONITOR SERVICE CODES
TROUBLESHOOTING THE BOSS® & LCD DISPLAY
BOSS® UNIT
Removal And Installation
BOSS® INSTRUMENT PANEL
Removal And Installation
ELECTRICAL/HYDRAULIC CONTROLS REFERENCE
Controls Identification Chart

SPECIFICATIONS
SKID STEER LOADER SPECIFICATIONS
753 – S/N 515811001 & Above, S/N 516211001 & Above
PERFORMANCE
CONTROLS
ENGINE
HYDRAULIC SYSTEM
ELECTRICAL
DRIVE SYSTEM
CAPACITIES
TIRES
FLOOR PRESSURE
753, 753H – S/N 508693001 & Above, S/N 508630001 & Above, S/N 511476001 & Above, S/N 512716001 & Above, S/N 513911001 & Above
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 Timing
Rocker Arms
Camshaft
Tappet
Cylinders
Piston Rings
Pistons
Connecting Rod
Oil Pump
Crankshaft
Timing Gear
Thermostat
Crankshaft Re–Grind Data
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
TORQUE SPECIFICATIONS FOR LOADER
HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS
STANDARD TORQUE SPECIFICATIONS FOR BOLTS
DECIMAL AND MILLIMETER EQUIVALENTS
U.S. TO METRIC CONVERSION

ADVANCED HAND CONTROL SYSTEM (AHC)
WIRING SCHEMATICS W/ADVANCED HAND CONTROL OPTIONS
AHC COMPONENTS
Identification
TROUBLESHOOTING (AHC)
ACTUATOR VOLTAGE TEST
Procedure
HANDLE CONTROL UNIT TEST
Procedure
BOBCAT INTERLOCK CONTROL SYSTEM (BICS™)
Troubleshooting Chart
ADVANCED HAND CONTROLS (AHC)
Troubleshooting Chart
AHC/PWM CONTROLLER
Removal And Installation
Description
Conditions
Troubleshooting Chart
Handle Testing
Solenoid Coil Testing
CONTROL HANDLE (ADVANCED HAND CONTROL) (AHC)
Control Handle Unit Removal And Installation
Control Unit Connector
Switch Handle Removal And Installation
AHC Handle Removal And Installation
AHC Handle Disassembly And Assembly
AHC Steering Lever Removal And Installation
AHC Steering Lever Boot
Actuators Removal And Installation
Actuators Disassembly And Assembly
Components Identification
Controller Connector And Wire Identification
AHC/PWM Controller Removal And Installation
Handle Sensor Removal And Installation
Handle Sensor Connector
Switch Handle Removal And Installation
Control Handle Removal And Installation
Control Handle Disassembly And Assembly
Control Lever Removal And Installation
Control Lever Boot
Actuators Disassembly And Assembly
BICS™ VALVE
Lift Arm By–Pass Orifice
Check Valve
Lock Valve
BICS™ Valve Solenoid
Removal And Installation
HYDRAULIC CONTROL VALVE
Removal And Installation
Identification Chart
Disassembly And Assembly
Load Check Valve
Lift Base End Restrictor
Main Relief Valve
Port Relief Valve (Lift)
Anti–Cavitation/Port Relief Valve
Port Relief Valve (Tilt)
Anti–Cavitation Valve
Rubber Boot
Lift And Tilt Spool
Inspection
Auxiliary Spool
Auxiliary Electrical Solenoid
Spool Seal Installation
H–Port Auxiliary Section

SERVICE MANUAL REVISIONS
753/753H–1
753/753H–2
753/753H–3
753/753H–4
753/753H–5

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