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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