Komatsu D20A-7, D20PL-7, D20PLL-7, D21A-7, D20-7A, D21P-7A Bulldozer Operation & Maintenance Manual
229 pages · Publication SEAM000905
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What's inside
From the manual's own table of contents: 24 sections, 82 entries. See sample pages (PDF, 316 KB)
Precautionsduringoperation4 topics
- Before starting engine
- Transportation
- Battery
- Towing
Precautions for maintenance2 topics
- Before carrying out maintenance
- During maintenance
General view2 topics
- General view of machine
- General view of controls and gauges
Explanation of components3 topics
- Meters and lamps
- Switches
- Manual pocket
Operation15 topics
- Check before starting engine
- Operations and checks before starting engine
- Starting engine
- Operations and checks after starting engine
- Moving machine off
- Steering machine
- Stopping machine
- Shifting gear, shifting between forward and reverse
- Precautions for operation
- Work possible using bulldozer
- Parking machine
- Check after finishing work
- Stopping engine
- Check after stopping engine
- Locking
Operation5 topics
- liB.1.4 Operations and checks before starting engine
- Shifting gear
- Shifting between forward and reverse
- ‘12.16. Tips for longer undercarriage life (Steel shoes only)
- Handling rubber shoes (Rubber shoes only)
Transportation4 topics
- Loading, unloading work
- Precautions for loading
- Lifting machine
- Precautions for transportation
Cold weather operation3 topics
- Precautions for low temperature
- Precautions after completion of work
- After cold weather
Long-term storage3 topics
- Before storage
- During storage
- After storage
Troubleshooting2 topics
- If battery is discharged
- Other trouble
Outlines of service2 topics
- Outline of oil, fuel, coolant
- Relating to electric system
Standard tightening torques for bolts and nuts1 topic
- 21. Introduction of necessary tools
Service procedure9 topics
- Initial 250 hours service
- When required
- Check before starting
- Every 50 hours service
- Every 250 hours service
- Every 500 hours service
- Every 1000 hours service
- Every 2000 hours service
- Every 4000 hours service
General precautions1 topic
- Precautions related to safety
Using seat belt2 topics
- Seat belt (for fixed type)
- Seat belt (for suspension type)
Inside this manual
Real pages from this operation & maintenance manual (229 pages). Open the sample pages (PDF, 316 KB)
- Controls and operation, page 93: 12B. OPERATION
- Specifications, page 153: 21. #llDARD
- Maintenance, page 198: 24. SERVICE
This is an operator's manual
Here's how it compares to the other manual types.
Service manual
Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.
Operator's manual
Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.
Parts manual
Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.
What it's used for
Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.
Service shops and owner/operators who repair their own equipment
Identifying correct parts and seeing how assemblies come apart and go back together
Keeping equipment running with less downtime
Factory manual, 229 pages
Quantity one is the manual described above.
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Other editions and similar models
Questions about model, serial number, engine coverage or contents? Contact us before purchasing and we'll help confirm it's the right manual. Please verify the manual type, machine model, serial number range and engine coverage before purchasing: manuals ordered in error carry a 20% restocking fee (return policy).