Bobcat 620 Loader Service Manual 6549846 (6–12) – PDF DOWNLOAD

Description

Bobcat 620 Loader Service Manual 6549846 (6–12) – PDF DOWNLOAD

FILE DETAILS:

Bobcat 620 Loader Service Manual 6549846 (6–12) – PDF DOWNLOAD

Language : English
Pages : 102
Downloadable : Yes
File Type : PDF

TABLE OF CONTENTS:

Bobcat 620 Loader Service Manual 6549846 (6–12) – PDF DOWNLOAD

MAINTENANCE SAFETY 3
INTRODUCTION 5
SYMBOLS 5
SERIAL NUMBER IDENTIFICATION 5
LOADER SERIAL NUMBER 5
ENGINE SERIAL NUMBER 5
PRE-DELIVERY INSPECTION 6
30 HOUR INSPECTION 6
PREVENTIVE MAINTENANCE 7
SERVICE SCHEDULE 7
AIR CLEANER SERVICE 8
ENGINE FUEL SYSTEM 8
ENGINE OIL AND FILTER REPLACEMENT 8
CLEANING ENGINE COOLING SYSTEM 9
TIRES 9
LOADER LUBRICATION 10
SEAT AND SEAT BELTS 10
ROLL-OVER PROTECTIVE STRUCTURE 10
CONTROLS 11
CHOKE LINKAGE ADJUSTMENT 11
THROTTLE ADJUSTMENT 11
ELECTRICAL SYSTEM 12
CHAIN ADJUSTMENT 12
BRAKE ADJUSTMENT 12
HYDRAULIC / HYDROSTATIC SYSTEM SERVICE 13
Hydraulic / Hydrostatic Transmission Fluid 13
checking, Adding Or Changing Fluid 13
Water In Reservoir 13
Replacement Of Section (25 Micron) Filter 13
Replacement Of 10 Micron Filter 14
LOADER HYDRAULIC SYSTEM 15
OPERATION OF THE HYDRAULIC SYSTEM 17
GENERAL INFORMATION 17
Clean Area 17
Air Leaks 17
Tubelines, Hoses & Fittings 17
37° Flare Connections 17
Straight Thread O-Ring Connections 18
Pipe Thread Connections 18
Tubelines & Hoses 18
TROUBLESHOOTING CHART FOR HYDRAULIC SYSTEM 19
CHARGING THE VANE PUMP AND CHECKING FOR SUCTION LEAKS 20
Charging The Pump When No Source Of Air Pressure Is Available 21
Another Method To Check The System For Air Leaks 21
CHECKING RELEASE PRESSURE 22
Machines Without Auxiliary Hydraulics 22
Machines With Auxiliary Hydraulics 22
CHECKING THE CONDITION OF THE VANE PUMP 22
Checking Vane Pump 22
VANE PUMP SERVICE 23
To Remove The Vane Pump 23
Disassembly 23
Inspection And Service 23
Assembly 24
To Install The Vane Pump 24
CONTROL VALVE AND HYDRAULIC CYLINDER CHECKS 24
Checking The Lift Cylinders 24
Checking The Tilt Cylinders 24
HYDRAULIC CYLINDER REPAIR 25
Removing Cylinders 25
To Disassemble A Hydraulic Lift Or Tilt Cylinder 25
To Replace The Cylinder Seals 25
To Assemble The Hydraulic Cylinder 26
CONTROL VALVE REPAIR 26
Relief Valve Repair 26
To Remove The Control Valve 26
To Disassemble The Control Valve 27
To Repair The Float Detent Of The Lift Spool 28
To Assemble The Detent Assembly 28
Inspection, Repair And Assembly Of Control Valve 28
HYDROSTATIC DRIVE SYSTEM 29
HYDROSTATIC DRIVE SYSTEM 31
Circuit Description 31
TROUBLESHOOTING CHART 32
PROBLEM ANALYSIS CHARTS 33
STEERING LINKAGE 36
Adjustment Of The Steering Linkage 36
To Remove The Steering Lever Assembly 37
CHECKING THE HYDROSTATIC SYSTEM 37
Charge Pressure Check (Levers In Neutral) 38
Charge Pressure Check (Levers Engaged) 38
CHECK VALVE SERVICE 38
Checking The Check Valve 38
To Remove The Check Valve 38
REPLENISHING VALVES 39
Checking The Replenishing Valves 39
HYDROSTATIC MOTOR REPLACEMENT 39
REPLACEMENT OF TRANSMISSION PUMP ASSEMBLY 40
Removal 40
HYDROSTATIC TRANSMISSION RECONDITIONING PROCEDURE 41
Transmission Pump 41
Disassembly Of Pumps And Motors 41
To Disassemble Pump Or Motor 41
Inspection Of Pump Or Motor 44
Assembly Of Pump Or Motor 44
START-UP AFTER REPAIR 45
MECHANICAL FINAL DRIVE SYSTEM 47
FINAL DRIVE SYSTEM (MECHANICAL) 49
REPAIR AND REPLACEMENT OF BRAKE ASSEMBLY 49
Removal Of Caliper Assembly 49
Removal Of Lever Assembly 49
Linkage Rod Assembly 49
FINAL DRIVE 50
CHAIN REMOVAL AND INSTALLATION 50
To Remove And Install Chains 50
Primary Drive Chain Removal 50
To Install The Primary Drive Chain 51
Secondary Drive Chain Removal 51
To Install The Secondary Drive Chain 51
Final Drive Chain Removal 51
To Install The Final Drive Chain 52
MOTOR SPROCKET SERVICE 52
Motor Sprocket Removal (Machines Without Brakes) 52
To Install The Motor Sprocket (Machines Without Brakes) 52
Motor Sprocket Removal (Machines With Brakes) 52
To Install The Motor Sprocket (Machines With Brakes) 53
UPPER JACKSHAFT SERVICE 53
To Remove The Upper Jackshaft Sprocket 53
Assembly 54
To Install Tjhe Upper Jackshaft Sprocket 54
IDLER SPROCKET SERVICE (PRIMARY AND SECONDARY) 54
SERVICING LOWER JACKSHAFT SPROCKET 54
To Remove The Lower Jackshaft Assembly 54
To Install The Lower Jackshaft Assembly 55
Lower Jackshaft Bearing Replacement 55
FINAL DRIVE TIGHTENER SERVICE 55
To Remove Final Drive Tightener 55
To Remove Final Drive Idler Sprocket And Bearing 56
To Install Final Drive Idler Bearing 56
WHEEL AND AXLE REPAIR 56
To Remove Axle Assembly 56
To Install New Axle Bearing And Seal 57
To Install The Axle 58
MAIN FRAME 59
THE BOB-TACH 61
Removal And Replacement Of Bob-Tach 61
LOADER LIFT ARM ASSEMBLY 61
Replacement Of Lift Arms 61
GRILL ASSEMBLY 62
FUEL TANK 62
Fuel Tank Removal 62
ELECTRICAL SYSTEM 63
ELECTRICAL CIRCUITRY 65
PROBLEM ANALYSIS CHARTS 65
GENERATOR DRIVE BELT 67
TO CHECK WIRING 67
TO CHECK GENERATOR OUTPUT 67
TO CHECK THE REGULATOR 68
GENERATOR SERVICE 68
Removal 68
Disassembly 68
To Check Rotor 68
To Check Stator 68
To Check Diode Trio 69
To Check Rectifier 69
Assembly 69
STARTER SERVICE 70
To Check The Starter 70
To Remove The Starter 70
Disassembly And Inspection 70
Assembly 70
WISCONSIN ENGINE SERVICE 71
TROUBLESHOOTING THE ENGINE 73
ENGINE IGNITION SYSTEM 74
Distributor Maintenance 74
Timing Procedure 74
Spark Plug 74
High Temperature Safety Switches 75
CARBURETOR SERVICE 75
Adjustment 75
Carburetor Removal & Disassembly 75
To remove The Throttle Body Assembly 75
To Disassemble The Throttle Body 75
To Disassemble The Fuel Bowl 76
To Assemble The Fuel Bowl And Air Intake Assembly 76
To Assemble The Throttle Body 77
To Assemble The Fuel Bowl To The Throttle Body 77
LP CARBURETOR SERVICE 78
To remove The LP Carburetor From The Engine 78
Disassembly 78
Cleaning And Inspection 78
Assembly 79
VAPORIZER – PRIMARY REGULATOR SERVICE 80
Disassembling The Vaporizer 81
Assembling The Vaporizer 81
Adjusting The Vaporizer 82
LP FUEL FILTER LOCK-OFF 82
ENGINE SERVICE 83
Engine Removal 83
Disassembly Of Flywheel 84
Air Shrouding 84
Carburetor And Manifolds 84
Cylinder Head 84
Gear Cover 85
Camshaft Gear 85
Idler Gear And Shaft 85
Oil Pan 85
Oil Pump 85
Pistons And Connecting Rods 85
Piston Rings 86
Cylinder Blocks 86
Valves And Seat Inserts 87
Crankshaft 87
Camshaft 87
Valve Tappets 87
Govenor Adjustment 88
Storage Of Engines 88
Returning Engine To Service 88
Returning Compression To Engine 88
SPECIFICATIONS, SPECIAL TOOLS AND ETC 89
FUEL SPECIFICATIONS 91
ENGINE OIL SPECIFICATIONS 91
HYDRAULIC / HYDROSTATIC TRANSMISSION FLUID 91
FITS, CLEARANCE AND ADJUSTMENTS 92
Engine 92
Hydraulic / Hydrostatic System 92
SPECIAL TOOLS 92
Main Frame & Hydraulics 92
Wisconsin Engine 93
Hydrostatic System 93
LP Carburetor 93
TORQUE SPECIFICATIONS 93
Loader Torques 93
EngineTorques 93
DECIMAL AND MILLIMETER EQUIVALENTS 94
U S TO METRIC CONVERSION 94
LOADER SPECIFICATIONS 95
Operational & Performance 95
Engine 95
Loader Hydraulics 95
Electrical 95
Power Train 95
Capacities 95
Tires 95
Machine Weight 95
ALPHABETICAL INDEX 97
SMR 101
620-1 101

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PLEASE NOTE:

• This is the SAME exact manual used by your dealers to fix your vehicle.
• The same can be yours in the next 2-3 mins as you will be directed to the download page immediately after paying for the manual.
• Any queries / doubts regarding your purchase, please feel free to contact [email protected]

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