Komatsu D21AG-7 D21S-7 D21QG-7 D21A-7T Official Workshop Service Manual
Komatsu D21AG-7 D21S-7 D21QG-7 D21A-7T Official Workshop Service Manual
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This is the COMPLETE Official Service Repair Manual for the Komatsu Bulldozers.
This manual contains deep information about maintaining, assembly, disassembly and servicing your Komatsu.
This PDF file is Bookmarked and SEARCHABLE to make what you need easy to find.
This Manual contains information and data to this model. has specs, diagrams, and actual real photo illustrations, and schemes, which give you complete step by step operations on repair, servicing, technical maintenance & troubleshooting procedures for your machine. this manual offers full information you need for repair your machine. the information in this manual will enable you to find trouble and to understand how to repair and maintain your machine without going into service. all pages are printable, so run off what you need and take it with you into the garage or workshop.
Models And Serials :
D20PL-7 - 62001 and Up
D20PLL-7 - 62001 and Up
D20AG-7 - 75001 and Up
D20P-7A - 75001 and Up
D20PG-7A - 75001 and Up
D21A-7 - 75001 and Up
D21AG-7 - 75001 and Up
D21S-7 - 61001 and Up
D21QG-7 - 61001 and Up
D21A-7T - 75001 and Up
CONTENTS :
-
01 GENERAL
- Specification drawings
- Specifications
- Weight table
- Fuel, coolant and lubricants
-
10 STRUCTURE AND FUNCTION
- Enigne control
- Power train system
- Power train skeleton
- Power train hydraulic piping
- Power train hydraulic circuit diagram
- Power train hydraulic system
- Main clutch control
- Main clutch
- Transmission
- Damper and universal joint
- Transmission control
- Transmission pump
- Hydroshift transmission
- Transmission control valve
- Steering clutch and brake control
- Steering main relief valve
- Steering cylinder
- Brake cylinder
- PPC valve
- Bevel gear shaft and steering clutch
- Steering brake
- Final drive
- Track frame
- Main frame and suspension
- Hydraulic piping
- Hydraulic circuit diagram
- Hydraulic circuit system
- Hydraulic control
- Hydraulic tank and filter
- Angle selector valve
- Hydraulic control valve
- Operation of work equipment control circuit
- Straight tiltdozer
- Power angle and tiltdozer
- Bucket and link
- Electrical wiring diagram
- Engine control
- Monitor system
- Sensors
-
20 TESTING AND ADJUSTING
- Standard value table for engine
- Standard value table for chassis
- Standard value table for electrical judgement
- Table of tools for testing, adjusting and trooubleshooting
- Measuring engine speed
- Measuring exhaust color
- Adjusting valve clearance
- Measuring compression pressure
- Measuring blow-by
- Testing and adjusting fuel injection timing
- Bleeding air from fuel circuit
- Measuring engine oil pressure
- Testing and adjusting fan belt tension
- Adjusting fuel control linkage
- Adjusting decelerator pedal linkage
- Measuring power train oil pressure
- Adjusting PPC valve
- Bleeding air from steering circuit
- Measuring and adjusting work equipment main relief pressure
- Bleeding air from hydraulic cylinders
- Bleeding air from angle cylinder circuit
- Adjusting fuel control lever
- Procedure for adjusting enigne stop motor cable
- Adjusting main clutch control linkage
- Adjusting transmission control linkage
- Adjusting travel of inching pedal
- Adjusting brake pedal, brake cylinder
- Adjusting brake lining clearance
- Troubleshooting
-
30 DISASSEMBLY AND ASSEMBLY
- Method of using manual
- Precautions when handling piping during disassembly
- Precautions when carrying out operation
- Starting motor
- Alternator
- Fuel Injection Pump
- Water Pump
- Thermostat
- Nozzle Holder
- Cylinder Head
- Radiator Guard
- Radiator
- Enigne
- Damper (D21-7)
- Main Clutch (D20-7)
- Transmission (D20-7)
- Hydroshift transmission (D21-7)
- Steering pump
- Modulating valve and pump (D21-7)
- Modulating valve (D21-7)
- Selector and inching valve (D21-7)
- Main relief valve
- Steering PPC valve
- Steering clutch
- Bevel gear shaft and bevel gear
- Final drive
- Final drive first pinion
- Final drive
- Power train oil cooler
- Track frame
- Recoil spring
- Idler
- Carrier roller
- Track roller
- Track shoe
- Hydraulic pump
- Hydraulic control valve
- Blade lift cylinder
- Blade tilt cylinder
- Blade angle cylinder
- Bucket lift cylinder (D21S, QG-7)
- Bucker dump cylinder (D21S, QG-7)
- Hydraulic cylinder
- Work equipment
- Blade
- Work equipment (D21S, QG-7)
- Bucket (D21S, QG-7)
- Operator's seat frame
-
40 MAINTENANCE STANDARD
- Main clutch
- Transmission
- Damper and universal joint
- Hydroshift transmission
- Transmission control valve
- Main clutch and steering pump
- Steering main relief valve
- Transmission and steering pump
- PPC valve
- Steering cylinder
- Bevel gear shaft
- Steering brake
- Steering clutch
- Final drive
- Track frame
- Idler cushion
- Idler
- Track roller
- Carrier roller
- Track shoe (lubricated track link) D21PL, PLL-7, D21A-7, D20P-7A
- Track shoe (dry type track link) D21PL, PLL-7, D21A-7, D20P-7A
- Track (lubricated track link) D21S-7
- Track (dry type track link) D21S-7
- Rubber clawler
- Hydraulic pump
- Hydraulic control valve
- Hydraulic cylinder
- Straight tiltdozer
- Bucket and link
-
90 OTHERS
- Trimming dozer
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