Bobcat 620 Skid-Steer Loader Repair Service Manual - 6549846

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This workshop repair service manual PDF download for the 620 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 620 


TABLE OF CONTENTS :

MAINTENANCE SAFETY
INTRODUCTION
PREVENTIVE MAINTENANCE
LOADER HYDRAULIC SYSTEM
HYDROSTATIC DRIVE SYSTEM
MECHANICAL FINAL DRIVE SYSTEM
MAIN FRAME
ELECTRICAL SYSTEM
WISCONSIN ENGINE SERVICE
SPECIFICATIONS, SPECIAL TOOLS AND ETC.
ALPHABETICAL INDEX


MANUAL SPECIFICATION :

File Format : PDF
Language : English
Printable : Yes
Searchable : Yes
Bookmarked : Yes
Product Code : 6549846 (9-75)
Total Pages : 100


This 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
INTRODUCTION
    SYMBOLS
    SERIAL NUMBER IDENTIFICATION
    LOADER SERIAL NUMBER
    ENGINE SERIAL NUMBER
    PRE-DELIVERY INSPECTION
    30 HOUR INSPECTION
    
PREVENTIVE MAINTENANCE
    SERVICE SCHEDULE
    AIR CLEANER SERVICE
    ENGINE FUEL SYSTEM
    ENGINE OIL AND FILTER REPLACEMENT
    CLEANING ENGINE COOLING SYSTEM
    TIRES
    LOADER LUBRICATION
    SEAT AND SEAT BELTS
    ROLL-OVER PROTECTIVE STRUCTURE
    CONTROLS
    CHOKE LINKAGE ADJUSTMENT
    THROTTLE ADJUSTMENT
    ELECTRICAL SYSTEM
    CHAIN ADJUSTMENT
    BRAKE ADJUSTMENT
    HYDRAULIC / HYDROSTATIC SYSTEM SERVICE
        Hydraulic / Hydrostatic Transmission Fluid
        checking, Adding Or Changing Fluid
        Water In Reservoir
        Replacement Of Section (25 Micron) Filter
        Replacement Of 10 Micron Filter
        
LOADER HYDRAULIC SYSTEM
    OPERATION OF THE HYDRAULIC SYSTEM
    GENERAL INFORMATION
        Clean Area
        Air Leaks
        Tubelines, Hoses & Fittings
        37° Flare Connections
        Straight Thread O-Ring Connections
        Pipe Thread Connections
        Tubelines & Hoses
    TROUBLESHOOTING CHART FOR HYDRAULIC SYSTEM
    CHARGING THE VANE PUMP AND CHECKING FOR SUCTION LEAKS
        Charging The Pump When No Source Of Air Pressure Is Available
        Another Method To Check The System For Air Leaks
    CHECKING RELEASE PRESSURE
        Machines Without Auxiliary Hydraulics
        Machines With Auxiliary Hydraulics
    CHECKING THE CONDITION OF THE VANE PUMP
        Checking Vane Pump
    VANE PUMP SERVICE
        To Remove The Vane Pump
        Disassembly
        Inspection And Service
        Assembly
        To Install The Vane Pump
    CONTROL VALVE AND HYDRAULIC CYLINDER CHECKS
        Checking The Lift Cylinders
        Checking The Tilt Cylinders
    HYDRAULIC CYLINDER REPAIR
        Removing Cylinders
        To Disassemble A Hydraulic Lift Or Tilt Cylinder
        To Replace The Cylinder Seals
        To Assemble The Hydraulic Cylinder
    CONTROL VALVE REPAIR
        Relief Valve Repair
        To Remove The Control Valve
        To Disassemble The Control Valve
        To Repair The Float Detent Of The Lift Spool
        To Assemble The Detent Assembly
        Inspection, Repair And Assembly Of Control Valve
        
HYDROSTATIC DRIVE SYSTEM
    HYDROSTATIC DRIVE SYSTEM
        Circuit Description
    TROUBLESHOOTING CHART
    PROBLEM ANALYSIS CHARTS
    STEERING LINKAGE
        Adjustment Of The Steering Linkage
        To Remove The Steering Lever Assembly
    CHECKING THE HYDROSTATIC SYSTEM
        Charge Pressure Check (Levers In Neutral)
        Charge Pressure Check (Levers Engaged)
    CHECK VALVE SERVICE
        Checking The Check Valve
        To Remove The Check Valve
    REPLENISHING VALVES
        Checking The Replenishing Valves
    HYDROSTATIC MOTOR REPLACEMENT
    REPLACEMENT OF TRANSMISSION PUMP ASSEMBLY
        Removal
    HYDROSTATIC TRANSMISSION RECONDITIONING PROCEDURE
        Transmission Pump
        Disassembly Of Pumps And Motors
        To Disassemble Pump Or Motor
        Inspection Of Pump Or Motor
        Assembly Of Pump Or Motor
    START-UP AFTER REPAIR
    
MECHANICAL FINAL DRIVE SYSTEM
    FINAL DRIVE SYSTEM (MECHANICAL)
    REPAIR AND REPLACEMENT OF BRAKE ASSEMBLY
        Removal Of Caliper Assembly
        Removal Of Lever Assembly
        Linkage Rod Assembly
    FINAL DRIVE
    CHAIN REMOVAL AND INSTALLATION
        To Remove And Install Chains
        Primary Drive Chain Removal
        To Install The Primary Drive Chain
        Secondary Drive Chain Removal
        To Install The Secondary Drive Chain
        Final Drive Chain Removal
        To Install The Final Drive Chain
    MOTOR SPROCKET SERVICE
        Motor Sprocket Removal (Machines Without Brakes)
        To Install The Motor Sprocket (Machines Without Brakes)
        Motor Sprocket Removal (Machines With Brakes)
        To Install The Motor Sprocket (Machines With Brakes)
    UPPER JACKSHAFT SERVICE
        To Remove The Upper Jackshaft Sprocket
        Assembly
        To Install Tjhe Upper Jackshaft Sprocket
    IDLER SPROCKET SERVICE (PRIMARY AND SECONDARY)
    SERVICING LOWER JACKSHAFT SPROCKET
        To Remove The Lower Jackshaft Assembly
        To Install The Lower Jackshaft Assembly
        Lower Jackshaft Bearing Replacement
    FINAL DRIVE TIGHTENER SERVICE
        To Remove Final Drive Tightener
        To Remove Final Drive Idler Sprocket And Bearing
        To Install Final Drive Idler Bearing
    WHEEL AND AXLE REPAIR
        To Remove Axle Assembly
        To Install New Axle Bearing And Seal
        To Install The Axle
        
MAIN FRAME
    THE BOB-TACH
        Removal And Replacement Of Bob-Tach
    LOADER LIFT ARM ASSEMBLY
        Replacement Of Lift Arms
    GRILL ASSEMBLY
    FUEL TANK
        Fuel Tank Removal
        
ELECTRICAL SYSTEM
    ELECTRICAL CIRCUITRY
    PROBLEM ANALYSIS CHARTS
    GENERATOR DRIVE BELT
    TO CHECK WIRING
    TO CHECK GENERATOR OUTPUT
    TO CHECK THE REGULATOR
    GENERATOR SERVICE
        Removal 
        Disassembly
        To Check Rotor
        To Check Stator
        To Check Diode Trio
        To Check Rectifier
        Assembly
    STARTER SERVICE
        To Check The Starter
        To Remove The Starter
        Disassembly And Inspection
        Assembly
        
WISCONSIN ENGINE SERVICE
    TROUBLESHOOTING THE ENGINE
    ENGINE IGNITION SYSTEM
        Distributor Maintenance
        Timing Procedure
        Spark Plug
        High Temperature Safety Switches
    CARBURETOR SERVICE
        Adjustment
        Carburetor Removal & Disassembly
        To remove The Throttle Body Assembly
        To Disassemble The Throttle Body
        To Disassemble The Fuel Bowl
        To Assemble The Fuel Bowl And Air Intake Assembly
        To Assemble The Throttle Body
        To Assemble The Fuel Bowl To The Throttle Body
    LP CARBURETOR SERVICE
        To remove The LP Carburetor From The Engine
        Disassembly
        Cleaning And Inspection
        Assembly
    VAPORIZER - PRIMARY REGULATOR SERVICE
        Disassembling The Vaporizer
        Assembling The Vaporizer
        Adjusting The Vaporizer
    LP FUEL FILTER LOCK-OFF
    ENGINE SERVICE
        Engine Removal
        Disassembly Of Flywheel
        Air Shrouding
        Carburetor And Manifolds
        Cylinder Head
        Gear Cover
        Camshaft Gear
        Idler Gear And Shaft
        Oil Pan
        Oil Pump
        Pistons And Connecting Rods
        Piston Rings
        Cylinder Blocks
        Valves And Seat Inserts
        Crankshaft
        Camshaft
        Valve Tappets
        Govenor Adjustment
        Storage Of Engines
        Returning Engine To Service
        Returning Compression To Engine
        
SPECIFICATIONS, SPECIAL TOOLS AND ETC.
    FUEL SPECIFICATIONS
    ENGINE OIL SPECIFICATIONS
    HYDRAULIC / HYDROSTATIC TRANSMISSION FLUID
    FITS, CLEARANCE AND ADJUSTMENTS
        Engine
        Hydraulic / Hydrostatic System
    SPECIAL TOOLS
        Main Frame & Hydraulics
        Wisconsin Engine
        Hydrostatic System
        LP Carburetor
    TORQUE SPECIFICATIONS
        Loader Torques
        EngineTorques
    DECIMAL AND MILLIMETER EQUIVALENTS
    U.S. TO METRIC CONVERSION
    LOADER SPECIFICATIONS
        Operational & Performance
        Engine
        Loader Hydraulics
        Electrical
        Power Train
        Capacities
        Tires
        Machine Weight
        
ALPHABETICAL INDEX

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