Komatsu D155A-3 Bulldozer Operation and Maintenance Manual (SEAM011000)

On a D155A-3 that’s pushing hard in quarry faces, landfills, or big cut-and-fill jobs, this Operation and Maintenance Manual is what I use to keep the machine predictable day after day. It lays out a sensible rhythm for checks and services so you’re not guessing when to grease, inspect, or adjust. If I’ve got a complaint like the blade not holding grade or the machine feeling lazy on a push, I’ll go back to this book to verify basic settings, walk through the routine inspections, and rule out simple maintenance issues before tearing into major components.

Applications & Use Cases

Plan daily and weekly checks so operators catch leaks, loose hardware, or track issues before they turn into downtime.
Set up a preventive maintenance schedule that fits your site’s workload rather than waiting for something to fail.
Trace early signs of wear in undercarriage, blade linkages, and cooling systems using the recommended inspection points.
Verify fluid and filter change routines to keep the engine, transmission, and hydraulics running stable under heavy load.
Train new operators on proper warm-up, shutdown, and care habits using the same guidelines your mechanic follows.

FAQ

Q: Can I keep this manual on a tablet in the cab?

A: Yes, it’s handy to have a digital copy for quick checks, but I still print key pages I use often and keep them in a shop binder.

Q: Is this useful if I’m not doing my own repairs?

A: Definitely; it helps you track service history, talk clearly with your dealer, and schedule work before failures stop the dozer.

Safety Note

Always follow the manual’s safety instructions and lockout procedures before inspecting, adjusting, or servicing the machine.

📘 Show Index

Komatsu D155A-3 Bulldozer Index:

COVER
1. FOREWORD
2. SAFETY INFORMATION
3. INTRODUCTION
4. LOCATION OF PLATES,TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
5. CONTENTS
SAFETY
- 6. GENERAL PRECAUTIONS
- 7. PRECAUTIONS DURING OPERATION
  - 7.1 BEFORE STARTING ENGINE
  - 7.2 OPERATING MACHINE
  - 7.3 TRANSPORTATION
  - 7.4 BATTERY
  - 7.5 TOWING
- 8. PRECAUTIONS FOR MAINTENANCE
  - 8.1 BEFORE CARRYING OUT MAINTENANCE
  - 8.2 DURING MAINTENANCE
- 9. POSITION FOR ATTACHING SAFETY LABELS AND STORAGE OF OPERATION & MAINTENANCE MANUAL
  - 9.1 POSITION FOR ATTACHING SAFETY LABELS
  - 9.2 CONTENT AND USE OF WARNING PLATES
  - 9.3 PLACE FOR STORING MANUAL
OPERATION
- 10. GENERAL VIEW
  - 10.1 GENERAL VIEW OF MACHINE
  - 10.2 GENERAL VIEW OF CONTROLS AND GAUGES
- 11. EXPLANATION OF COMPONENTS
  - 11.1 FRONT PANEL (METERS, LAMPS, SWITCHES)
  - 11.2 SWITCHES
  - 11.3 CONTROL LEVERS AND PEDALS
  - 11.4 DUST INDICATOR
  - 11.5 FUSE BOX
  - 11.6 GREASE PUMP HOLDER
  - 11.7 DOOR-OPEN LOCK (MACHINES EQUIPPED WITH CAB)
  - 11.8 SASH GLASS INTERMEDIATE LOCK (MACHINES EQUIPPED WITH CAB)
  - 11.9 HOT AND COOL BOX (MACHINES EQUIPPED WITH CAB)
  - 11.10 DOOR POCKET (MACHINES EQUIPPED WITH CAB)
  - 11.11 ASHTRAY (MACHINES EQUIPPED WITH CAB)
  - 11.12 TOOL BOX
  - 11.13 USING CAR RADIO (MACHINES EQUIPPED WITH CAB, CAR RADIO)
  - 11.14 HANDLING AIR CONDITIONER (MACHINES EQUIPPED WITH CAB)
  - 11.15 HANDLING HEATER (MACHINES EQUIPPED WITH CAB)
  - 11.16 HANDLING ACCUMULATOR
  - 11.17 LOCATION OF FIRE EXTINGUISHER
- 12. OPERATION
  - 12.1 CHECK BEFORE STARTING ENGINE
  - 12.2 STARTING ENGINE
  - 12.3 OPERATIONS AND CHECKS AFTER STARTING ENGINE
  - 12.4 MOVING MACHINE
  - 12.5 SHIFTING GEAR
  - 12.6 SHIFTING BETWEEN FORWARD AND REVERSE
  - 12.7 STEERING MACHINE
  - 12.8 STOPPING MACHINE
  - 12.9 PRECAUTIONS FOR OPERATION
  - 12.10 PARKING MACHINE
  - 12.11 CHECK AFTER FINISHING WORK
  - 12.12 STOPPING ENGINE
  - 12.13 CHECK AFTER STOPPING ENGINE
  - 12.14 LOCKING
  - 12.15 RIPPER OPERATION
  - 12.16 WORK POSSIBLE USING BULLDOZER
  - 12.17 ADJUSTING POSTURE OF WORK EQUIPMENT
  - 12.18 TIPS FOR LONGER UNDERCARRIAGE LIFE
- 13. TRANSPORTATION
  - 13.1 LOADING,UNLOADING WORK
  - 13.2 PRECAUTIONS FOR LOADING
  - 13.3 METHOD OF LIFTING MACHINE
  - 13.4 PRECAUTIONS FOR TRANSPORTATION
  - 13.5 REMOVAL OF CAB (MACHINES EQUIPPED WITH CAB)
- 14. COLD WEATHER OPERATION
  - 14.1 PRECAUTIONS FOR LOW TEMPERATURE
  - 14.2 AFTER COMPLETION OF WORK
  - 14.3 AFTER COLD WEATHER
- 15. LONG-TERM STORAGE
  - 15.1 BEFORE STORAGE
  - 15.2 DURING STORAGE
  - 15.3 AFTER STORAGE
- 16. TROUBLESHOOTING
  - 16.1 AFTER RUNNING OUT OF FUEL
  - 16.2 METHOD OF TOWING MACHINE
  - 16.3 IF BATTERY IS DISCHARGED
  - 16.4 OTHER TROUBLE
MAINTENANCE
- 17. GUIDES TO MAINTENANCE
- 18. OUTLINES OF SERVICE
  - 18.1 OUTLINE OF OIL,FUEL,COOLANT
  - 18.2 RELATING TO ELECTRIC SYSTEM
- 19. WEAR PARTS LIST
- 20. USE OF FUEL,COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
- 21. STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
  - 21.1 INTRODUCTION OF NECESSARY TOOLS
  - 21.2 TORQUE LIST
- 22. PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
- 23. MAINTENANCE SCHEDULE CHART
- 24. SERVICE PROCEDURE
  - 24.1 INITIAL 250 HOURS SERVICE
  - 24.2 WHEN REQUIRED
  - 24.3 CHECK BEFORE STARTING
  - 24.4 EVERY 250 HOURS SERVICE
  - 24.5 EVERY 500 HOURS SERVICE
  - 24.6 EVERY 1000 HOURS SERVICE
  - 24.7 EVERY 2000 HOURS SERVICE
  - 24.8 EVERY 4000 HOURS SERVICE
SPECIFICATIONS
- 25. SPECIFICATIONS
OPTIONS,ATTACHMENTS
- 26. USING SEAT BELT
  - 26.1 FASTEN THE BELT AND REMOVE IT IN THE FOLLOWING MANNER
- 27. HANDLING HEADREST
  - 27.1 ADJUSTING HEIGHT OF HEADREST
- 28. HANDLING REVERSIBLE FAN
  - 28.1 REVERSING REVERSIBLE FAN
- 29. HANDLING CAP WITH LOCK
  - 29.1 OPENING AND CLOSING LOCKABLE CAP
- 30. PROCEDURE FOR SELECTING RIPPER POINT
  - 30.1 PROCEDURE FOR SELECTING RIPPER POINT
- 31. GENERAL PRECAUTIONS
  - 31.1 PRECAUTIONS RELATED TO SAFETY