Komatsu TD-25H Operation and Maintenance Manual (OMTD25H00-1E)

A TD-25H dozer usually lives on tough jobs: ripping, pushing, and finish grading in quarry, mining, and heavy earthmoving sites. This Operation and Maintenance Manual is what I’d keep in the cab or shop office to set a sane service rhythm, so the machine doesn’t quit in the middle of a push. When a customer complains about sluggish blade response or the machine running hotter than normal, I use this book to walk through the basic checks, daily walk-arounds, and scheduled services that usually catch the issue before it turns into a major teardown.

Applications & Use Cases

Plan preventive maintenance so filters, oils, and wear points get attention before they cause downtime.
Set up operator walk-around routines to spot leaks, loose hardware, and track problems early.
Verify adjustment and inspection steps after repairs, making sure linkages and controls are working smoothly.
Trace early signs of overheating or power loss using the manual’s recommended check order.
Align service timing with job schedules to keep the dozer available when production needs it most.

FAQ

Q: Can I keep a digital copy on a tablet in the cab?

A: Yes, that’s ideal for quick searches, but protect the device from dust and vibration.

Q: Is it worth printing certain pages?

A: Print the routine service and inspection pages; they’re handy to mark up and hang in the shop.

Safety Note

Always follow the manual’s shutdown and lockout steps before inspecting or servicing the machine.

📘 Show Index

Komatsu TD-25H Index:

MAIN MENU
COVER
SECTION CONTENTS
1. INTRODUCTION
- 1.1. INTRODUCTION
- 1.2. SERIAL NUMBERS
2. SAFETY PRECAUTIONS
- 2.1. GENERAL
- 2.2. BEFORE STARTING THE ENGINE
- 2.3. OPERATION
- 2.4. MAINTENANCE
- 2.5. SHUTDOWN
- 2.6. SAFETY PRODUCT GRAPHIC LOCATION
  - 2.6.1. SAFETY PRODUCT GRAPHIC
3. MACHINE TRANSPORT AND STORAGE
- 3.1. MACHINE TRANSPORT
  - 3.1.1. GENERAL
  - 3.1.2. TRUCK
  - 3.1.3. RAILROAD FLAT CAR
- 3.2. LIFTING A MACHINE ON SLINGS
- 3.3. MOVING A DISABLED MACHINE
- 3.4. MACHINE STORAGE
  - 3.4.1. PREPARING FOR STORAGE
  - 3.4.2. SERVICING MACHINE DURING STORAGE
  - 3.4.3. PREPARING FOR OPERATION AFTER STORAGE
4. OPERATING
- 4.1. MACHINE PRECAUTIONS
- 4.2. UNIVERSAL SYMBOLS FOR INSTRUMENTS AND CONTROLS
- 4.3. INSTRUMENT PANEL
- 4.4. CAB CONTROLS
- 4.5. CONTROLS AND ADJUSTMENT
  - 4.5.1. SEAT
  - 4.5.2. SEAT BELT
  - 4.5.3. ENGINE SPEED AND SHUT DOWN LEVER
  - 4.5.4. TRANSMISSION NEUTRAL LOCK LEVER
  - 4.5.5. TRANSISSION SHIFT LEVER
  - 4.5.6. HAND STEERING LEVERS
  - 4.5.7. BRAKE AND DECELERATOR PEDAL
  - 4.5.8. BRAKE AND DECELERATOR PEDAL LOCK
  - 4.5.9. ELECTRIC SYSTEM MASTER SWITCH
  - 4.5.10. EQUIPMENT CONTROL LEVERS
- 4.6. STARTING THE ENGINE
  - 4.6.1. NORMAL START
  - 4.6.2. ETHER INJECTION START
  - 4.6.3 ENGINE START AFTER OIL CHANGE OR PROLONGED STANDSTILL
- 4.7. STOPPING THE ENGINE
- 4.8. TIPS FOR ENGINE SAFEGUARDING
- 4.9. DRIVING THE MACHINE
- 4.10. SHIFTING THE TRANSMISSION
- 4.11. CONVERTER OVERHEATING
- 4.12. STEERING THE MACHINE
  - 4.12.1. GRADUAL TURN
  - 4.12.2. PIVOT TURN
- 4.13. DOWNGRADE OPERATION
- 4.14. OPERATING OVER AN OBSTRUCTION
- 4.15. STOPPING THE MACHINE
- 4.16. PARKING THE MACHINE
- 4.17. OPERATING THE MOUNTED EQUIPMENT
  - 4.17.1. BLADE CONTROL LEVER
  - 4.17.2. RIPPER CONTROL LEVERS
- 4.18. BLADE POSITIONS
  - 4.18.1. BULLDOZER BLADE POSITIONS
- 4.19. OPERATING TECHNIQUES
  - 4.19.1. DIGGING AND CLEARING
  - 4.19.2. TRANSPORTING, PILING OR LOADING
  - 4.19.3. BREAKING PILES AND SPREADING
  - 4.19.4. RIPPING
- 4.20. ECONOMICAL OPERATION OF THE MACHINE
5. MAINTENANCE
- 5.1. SERVICE PRECAUTIONS
- 5.2. SCHEDULED MAINTENANCE GUIDE
  - 5.2.1. GROUD LEVEL INSPECTION
- 5.3. MAINTENANCE AND SERVICE CHART
  - 5.3.1. REFILL SPECIFICATIONS AND CAPACITIES CHART
- 5.4. LUBRICATION
  - 5.4.1. WHEN SHIPPED
  - 5.4.2. WHEN SERVICED
  - 5.4.3. SELECTION
  - 5.4.4. VISCOSITIES
  - 5.4.5. RECOMMENDED LUBRICANT CHART
- 5.5. SEASONAL PREPARATION
  - 5.5.1 FUEL SYSTEM
  - 5.5.2. COOLING SYSTEM
  - 5.5.3. ELECTRIC SYSTEM
- 5.6. AIR CLEANING SYSTEM
  - 5.6.1. AIR PRE-CLEANER
  - 5.6.2. AIR CLEANER
  - 5.6.3. CHECKING AIR INTAKE SYSTEM FOR LEAKS
- 5.7. BELTS
  - 5.7.1. VISUAL INSPECTION
  - 5.7.2. CHECKING TENSION AND ADJUSTMENT
  - 5.7.3. BELT REPLACEMENT
- 5.8. COOLING SYSTEM
  - 5.8.1. WATER
  - 5.8.2. ANTIFREEZE
  - 5.8.3. INHIBITORS/CONDITIONERS
  - 5.8.4. RADIATOR CAP
  - 5.8.5. CHECKING COOLANT LEVEL
  - 5.8.6. CHANGING COOLANT
  - 5.8.7. CHANGING THE COOLANT FILTER
- 5.9. FAN
- 5.10. ELECTRICAL SYSTEM
  - 5.10.1. ELECTRIC WIRES AND CONNECTIONS
  - 5.10.2. AUTOMATIC RESET CIRCUIT BREAKER
  - 5.10.3. BATTERIES
- 5.11. ENGINE
  - 5.11.1. CHECKING THE CRANKCASE OIL
  - 5.11.2. CHANGING THE CRANKCASE OIL AND OIL FILTER
  - 5.11.3. ETHER INJECTOR
- 5.12. FUEL SYSTEM
  - 5.12.1. FILLING THE FUEL TANK
  - 5.12.2. FUEL TANK FILLER STRAINER
  - 5.12.3. FUEL TANK SHUTOFF VALVE
  - 5.12.4. FUEL FITLERS
  - 5.12.5. DRAINING THE FUEL TANK
- 5.13. HYDRAULIC SYSTEM
  - 5.13.1. CHECKING THE OIL LEVEL
  - 5.13.2. CHANGING HYDRAULIC OIL
  - 5.13.3. REPLACEMENT OF THE RETURN FILTERS AND PILOT FILTER
  - 5.13.4. SERVICING THE SUCTION STRAINER AND FILLER STRAINER
  - 5.13.5. SERVICING THE RESERVOIR BREATHER
  - 5.13.6. VENTING THE HYDRAULIC SYSTEM
- 5.14. LUBRICATING FITTINGS
- 5.15. MOUNTED EQUIPMENT
  - 5.15.1. COMPLETE BLADE REMOVAL AND INSTALLATION
  - 5.15.2. DIAGONAL STRUTS ADJUSTMENT
  - 5.15.3. UPPER STRUT AND TILT CYLINDER ADJUSTMENT
  - 5.15.4. PITCH CYLINDER CLEARANCE ADJUSTMENT
  - 5.15.5. CHECKING THE BLADE CONDITION
  - 5.15.6. SERVICING THE RIPPER
- 5.16. SAFETY BELT
- 5.17. FINAL DRIVES
  - 5.17.1. CHECKING THE OIL LEVEL
  - 5.17.2. CHANGING THE OIL
- 5.18. TRANSMISSION SYSTEM
  - 5.18.1 CHECKING THE OIL LEVEL IN REAR MAIN FRAME
  - 5.18.2. CHANGING TRANSMISSION SYSTEM OIL
  - 5.18.3 SERVICING THE TRANSMISSION SYSTEM PRESSURE FILTERS
  - 5.18.4. SERVICING THE SUCTION STRAINER
  - 5.18.5. SERVICING THE TRANSMISSION SCAVENGER STRAINER
  - 5.18.6. SERVICING THE BREATHER
- 5.19. UNDERCARRIAGE
  - 5.19.1. TRACK SHOE BOLTS
  - 5.19.2. EFFECT OF TRACK ADJUSTMENT ON UNDERCARRIAGE WEAR
  - 5.19.3. CHECKING THE TENSION
  - 5.19.4. ADJUSTING TENSION
  - 5.19.5. TRACK FRAME GUIDE
  - 5.19.6. PIVOT SHAFT HOUSING
  - 5.19.7. FRONT WHEEL GUIDES
- 5.20. ADJUSTING HAND AND FOOT CONTROLS
- 5.21. CAB AND ROPS
  - 5.21.1. ROPS CAB/CANOPY AND MOUNTED EQUIPMENT MOUNTING HARDWARE
  - 5.21.2. AIR CONDITIONER FILTER CLEANING
  - 5.21.3. WINDSHIELD WASHER RESERVOIR
6. SPECIFICATIONS
- 6.1. APPLICATION
- 6.2. TECHNICAL DESCRIPTION
- 6.3. SPECIFICATIONS
  - 6.3.1. OVERALL DIMENSIONS OF DOZERS
  - 6.3.2. ENGINE
  - 6.3.3. ELECTRICAL SYSTEM
  - 6.3.4. TORQUE CONVERTER
  - 6.3.5. TRAVEL SPEEDS
  - 6.3.6. TRANSMISSION
  - 6.3.7. STEERING DRIVE
  - 6.3.8. FINAL DRIVES OPERATION WEIGHTS
  - 6.3.9. TRACK FRAMES
  - 6.3.10. TRACK CHAINS
  - 6.3.11. FUEL CONSUMPTION
  - 6.3.12. WEIGHT (APPROXIMATE)
  - 6.3.13. BLADE
  - 6.3.14. RIPPER
- 6.4. REFILL CAPACITIES
- 6.5. SPECIAL TORQUES
- 6.6. TORQUE VALUES FOR STANDARD METRIC FASTENERS
- 6.7. TORQUE VALUES FOR STANDARD ENGLISH FASTENERS
- 6.8. TORQUE VALUES FOR SPLIT FLANGE CONNECTIONS
- 6.9. TORQUE VALUES FOR HYDRAULIC TUBES AND FITTINGS
- 6.10. TORQUE VALUES FOR HOSE CLAMPS
- 6.11. TORQUE VALUES FOR AIR CONDITIONING TUBES AND FITTINGS
- 6.12. TORQUE VALUES FOR AIR CONDITIONING O-RING CONNECTIONS
- 6.13. LIST OF SERVICE TOOLS
- 6.14. DRIVE TRAIN SCHEMATIC
- 6.15. DRIVE TRAIN HYDRAULIC SYSTEM DIAGRAM
- 6.16. EQUIPMENT HYDRAULIC SYSTEM DIAGRAM
- 6.17. WIRING DIAGRAM
- 6.18. CAB WIRING DIAGRAM