Description
Komatsu D20-6 D21-6 Dozer Service Manual provides comprehensive servicing, testing, troubleshooting and repair information for the D20 and D21 Series 6 crawler dozers and bulldozers.
This detailed 493-page service repair manual covers sixteen D20-6 and D21-6 model variations. It contains technical information for inspecting the machines, diagnosing faults and completing routine servicing or major repairs.
The manual is suitable for professional engineers, plant repair workshops, fleet maintenance departments and experienced owners maintaining these Komatsu machines.
Technical specifications, system descriptions, testing procedures, adjustment instructions and repair guidance are provided throughout the manual. Illustrations and diagrams assist with component identification, dismantling, inspection, reassembly and installation.
ENGINE AND ASSOCIATED SYSTEMS
The Komatsu D20-6 D21-6 Dozer Service Manual contains information for inspecting, testing, servicing and repairing the engine and its supporting systems. Specifications and measurement information can be used to assess component condition and identify excessive wear.
Engine-related information includes:
• Engine specifications and technical data
• Cooling-system inspection and servicing
• Fuel-system components and operation
• Lubrication-system information
• Air-intake and exhaust components
• Engine testing and adjustment
• Component inspection procedures
• Engine removal and installation
• Dismantling and assembly guidance
POWERTRAIN AND TRANSMISSION
The powertrain sections explain the components responsible for transferring engine power through the machine. Testing and troubleshooting information can help identify the cause of poor performance, drive problems, abnormal operation or unusual noise.
Powertrain information includes:
• Clutch and transmission components
• Drive shafts and connecting components
• Steering-system components
• Brake-system components
• Final-drive assemblies
• Powertrain testing procedures
• Adjustment and inspection information
• Component removal and installation
• Dismantling and reassembly guidance
HYDRAULIC SYSTEM
The Komatsu D20-6 D21-6 Dozer Service Manual provides hydraulic information to help engineers understand the operating circuits and diagnose leakage, pressure or performance problems.
Hydraulic subjects include:
• Hydraulic-system specifications
• Hydraulic circuit information
• Pumps and pump components
• Main control valves
• Blade lift and tilt equipment
• Hydraulic cylinders
• Hoses, pipes and connections
• Pressure testing and adjustment
• Hydraulic troubleshooting procedures
• Component removal and installation
UNDERCARRIAGE
The undercarriage requires regular inspection because its components operate in abrasive and demanding conditions. The manual provides information for inspecting, adjusting and repairing the track system.
Undercarriage information includes:
• Track frames and track assemblies
• Track chains, shoes and links
• Track rollers and carrier rollers
• Front idlers and sprockets
• Track-tension inspection
• Track adjustment procedures
• Component wear inspection
• Removal and installation guidance
• Pins, bushes and associated parts
BLADE AND WORK EQUIPMENT
The manual includes service information for the blade and other work equipment fitted to the covered machine variations. Diagrams help identify the relationship between cylinders, linkages, mounting points and associated components.
Work-equipment information includes:
• Blade assembly and mounting
• Lift and tilt components
• Hydraulic cylinders and connections
• Control linkages
• Pins, bushes and fasteners
• Inspection for wear or damage
• Removal and installation procedures
• Adjustment and servicing guidance
ELECTRICAL SYSTEM
The electrical sections contain information for checking and servicing the main electrical equipment. Wiring information and test procedures can help identify electrical problems before components are replaced.
Electrical information includes:
• Battery and electrical connections
• Starting and charging systems
• Switches and warning devices
• Instruments and gauges
• Wiring and electrical circuits
• Electrical testing procedures
• Fault diagnosis and troubleshooting
• Component removal and installation
TESTING AND ADJUSTMENT
The Komatsu D20-6 D21-6 Dozer Service Manual includes testing and adjustment information for checking machine condition and performance.
Specifications and standard values allow workshop measurements to be compared with the manufacturer’s technical information. These procedures help determine whether adjustment, repair or component replacement is required.
Testing and adjustment subjects include:
• Standard service measurements
• Pressure and performance checks
• Inspection standards and wear limits
• Engine and machine operating tests
• Steering and brake adjustments
• Track-tension adjustments
• Fault symptoms and possible causes
• Recommended diagnostic checks
TROUBLESHOOTING AND REPAIR
Troubleshooting information guides engineers through an organised sequence of inspections when investigating engine, mechanical, hydraulic or electrical problems.
Following a logical testing procedure can reduce unnecessary dismantling and prevent serviceable components from being replaced. Repair procedures explain how to remove, inspect, dismantle, assemble and reinstall the principal machine components.
The Komatsu D20-6 D21-6 Dozer Service Manual can also help engineers prepare for repairs by confirming specifications, component arrangements and adjustment information before dismantling begins.
MODELS COVERED
Komatsu D20A-6
Komatsu D20P-6
Komatsu D20P-6A
Komatsu D20PL-6
Komatsu D20PLL-6
Komatsu D20S-6
Komatsu D20Q-6
Komatsu D21A-6
Komatsu D21E-6
Komatsu D21P-6
Komatsu D21P-6A
Komatsu D21P-6B
Komatsu D21PL-6
Komatsu D21S-6
Komatsu D21S-6A
Komatsu D21Q-6
MANUAL DETAILS
Manual type: Service Repair Manual
Format: Digital PDF
Language: English
Number of pages: 493
The complete model and machine identification details should be checked before purchase to confirm that this manual covers the correct dozer variation.
This publication is intended for mechanical, hydraulic and electrical servicing and repair. The appropriate operation and maintenance manual should also be used for everyday controls, operating instructions, safety information and scheduled maintenance intervals.
The Komatsu D20-6 D21-6 Dozer Service Manual is an essential technical reference for owners, engineers and workshops responsible for maintaining these machines. It provides the specifications, diagrams and procedures needed to diagnose faults and complete repair work correctly.
Keeping the Komatsu D20-6 D21-6 Dozer Service Manual available allows specifications, adjustments, inspection procedures and component arrangements to be checked before work begins.
Download instructions are supplied following purchase, allowing the complete digital PDF manual to be delivered electronically.
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