A D61 in the yard with a slipping steering brake and a final drive weeping oil needs answers, and the Komatsu D61EX-12, D61PX-12 shop manual PDF (SEBM036700) carries them across 617 pages of factory bulldozer data. Testing and adjusting fills roughly a quarter of the book, pairing the chassis standard value table with troubleshooting sequences that trace a fault from symptom to the failed component. Disassembly runs from engine removal through the torque converter, HSS motor, final drive and track rollers, while the maintenance standard section gives you wear limits for the bevel gear shaft, brakes and work equipment cylinders. Keep at least 50 mm between the output shaft and the ground during final drive work, and bring radiator hose clamps to 8.8 ± 0.5 Nm. A rebuild stalls when one number is missing. Search the text or jump by bookmark on screen, then print the sections your job calls for and let those pages get greasy on the bench.
What's Inside This Komatsu D61EX-12, D61PX-12 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 23-34 | Specification Drawing, Specifications, Weight Table, Table of Fuel, Coolant and Lubricants |
| Structure and Function | 35-165 | Power Train System, Transmission, Transmission Control Valve, Bevel Gear Shaft, HSS Steering, Steering Brake, Hydraulic and HSS Pump, Main Control Valve |
| Testing and Adjusting | 166-311 | Standard Value Table for Chassis, Troubleshooting |
| General Procedures and Engine | 312-330 | Manual Usage, Safety Precautions, Special Tools, Engine Removal and Installation, Radiator and Guard |
| Power Train Components | 331-390 | Radiator, Fuel Tank, Damper, PTO, Torque Converter, Transmission, Transmission Control Valve |
| Steering and Brake Systems | 391-427 | Steering Brake, HSS, Brake Valve, HSS Motor, Scavenging Pump, Power Train Oil Pump |
| Undercarriage and Track Components | 428-501 | Final Drive, Track Frame, Recoil Spring, Idler, Track Roller, Carrier Roller, Track Shoe, Pivot Shaft |
| Hydraulic System and Work Equipment | 502-560 | HSS and Hydraulic Pump, PPC Pump, Main Control Valve, Steering PPC Valve, Hydraulic Cylinders, Work Equipment, Floor Frame |
| Maintenance Standard | 561-609 | Bevel Gear Shaft, HSS Steering, Brake, Main Control Valve, Work Equipment Cylinder, Work Equipment |
| Others | 610-617 | Electric Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard Tightening Torque (Metric Nuts and Bolts) | 11.8 – 14.7 Nm (1.2 – 1.5 kgm) to 2890 – 3630 Nm (295 – 370 kgm) | p. 12 |
| Tightening Torques for Flared Nuts | 24.5 ± 4.9 Nm (2.5 ± 0.5 kgm) to 294.2 ± 49 Nm (30 ± 5 kgm) | p. 12 |
| Radiator Fin pitch | 4.0 mm | p. 36 |
| Radiator hose clamp torque | 8.8 ± 0.5 Nm {0.9 ± 0.05 kgm} | p. 330 |
| Distance between output shaft and ground | at least 50 mm | p. 431 |
| Transmission case oil capacity | 69 L | p. 428 |
| Final drive mounting bolt torque | 490 – 608 Nm {50 – 62 kgm} | p. 430 |
| Guard mounting bolt torque | 235 – 285 Nm {23.5 – 29.5 kgm} | p. 430 |
| Track roller assembly weight | 45 kg (1 piece of single type), 52 kg (1 piece of double type) | p. 459 |
| Track roller mounting bolt torque | 230 – 289 Nm | p. 459 |
| Lubricator torque | 58.8 – 88.2 Nm | p. 453 |
| Support mounting bolt torque | 235 – 285 Nm | p. 453 |
Komatsu D61EX-12, D61PX-12 Common Problems This Manual Covers
Komatsu D61EX-12 and D61PX-12 bulldozer steering brake and brake valve check when the brake does not work
Test the brake using the H-mode brake does not work flowchart, checking the brake valve and steering brake in the order it lists. Compare worn parts against the brake values in the Maintenance Standard. If the steering brake has to come out, use the removal procedure in the Steering and Brake Systems section starting on page 391.
Manual Section: Brake System TroubleshootingHSS steering turning speed slow, turning lacks power, or machine cannot turn
Test the steering with the H-mode flowcharts for slow turning, weak turning and no turn, checking items in the order listed. Inspect the HSS and hydraulic pump, steering PPC valve and HSS motor where the chart points. Do not swap parts on a hunch. Compare HSS steering parts against the Maintenance Standard tables starting on page 561.
Manual Section: Steering System TroubleshootingTransmission excessive time lag, machine movement problems, or high power train oil temperature
Test the machine with the H-mode transmission flowcharts for time lag, machine movement and power train oil temperature, checking items in the order listed. Inspect the transmission control valve and torque converter where the chart points. When the transmission is torn down, check clutch springs against installed load, such as 113N {11.5 kg} for the No.1 clutch spring on page 566.
Manual Section: Transmission TroubleshootingWork equipment cylinders show hydraulic drift, or work equipment speed is slow
Test work equipment speed and drift with the H-mode flowcharts, checking items in the order listed. Inspect the main control valve, PPC pump and work equipment cylinders where the chart points. Compare cylinder parts against the Maintenance Standard tables, and after any repair refill to the 48L hydraulic system capacity listed on page 33.
Manual Section: Work Equipment TroubleshootingSprocket teeth worn and track link pitch stretched past the repair limit
Measure the sprocket tooth top surface against the 298 mm standard and 280 mm repair limit on page 581. Measure link pitch against the 190.3 mm standard and 193.3 mm repair limit on page 587. Check bushing outside diameter against the 65 mm standard and 56.5 mm heavy-duty repair limit. Torque regular shoe bolts to 539 ± 49 Nm.
Manual Section: Maintenance Standard p. 581Track rollers, carrier rollers and idler tread worn down to repair limit
Measure the track roller tread diameter against the 200 mm standard and 164 mm repair limit on page 584. Check carrier roller tread against 165 mm standard and 143 mm limit on page 585, and idler tread outside diameter against 550 mm standard and 530 mm limit on page 583. Fill a rebuilt track roller with 260 cc of oil.
Manual Section: Maintenance Standard p. 584Frequently Asked Questions
What are the torque specifications for the track roller mounting bolts on a Komatsu D61EX-12?
Apply thread tightener (LT-2) to the thread of each track roller mounting bolt, then tighten the track roller mounting bolt to 230 – 289 Nm (23.5 – 29.5 kgm). p. 459
How much oil does each side of the final drive take on the Komatsu D61EX-12?
When you drain the final drive case, plan on 28.5 L of oil for each side of the final drive. p. 430
What is the standard intake and exhaust valve clearance on the S6D114E-1 engine in the Komatsu D61EX-12, D61PX-12?
The standard valve clearance for the intake valve is 0.33 mm and for the exhaust valve is 0.71 mm when the engine is cold. p. 167
What is the main relief pressure for the transmission, steering clutch and brake on the Komatsu D61EX-12?
The main relief valve on the Komatsu D61EX-12 sets the specified pressure for the transmission, steering clutch and brake: main relief pressure is 2.79 MPa (28.5 kg/cm²). p. 60
How do you adjust the fan belt tension on the Komatsu D61EX-12?
To adjust the fan belt tension, loosen the tension pulley mounting bolts (1), (2), and (3), then loosen the locknut (4) and move the bar (5) to adjust the tension. After adjustment, tighten the locknut (4) to 98 – 123 Nm (10 – 12.5 kgm) and tighten the mounting bolts. p. 187
Is this Komatsu D61EX-12 manual a PDF I download?
You download the Shop Manual yourself: 617 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Is this Komatsu D61EX-12 Shop Manual printable?
Yes. Print the pages or sections you need for your own shop use. Any standard printer works.
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