Komatsu DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DRP060-4A-EX (S/N 60001-60941-UP, D65EX-12) is a medium-class crawler bulldozer designed for heavy earthmoving and production work. This specific serial range belongs to the D65EX-12 generation, which succeeded the D65E-12 series and was later replaced by the D65EX-15 and D65EX-18 generations. The machine features a Tier 4 Final compliant engine, operating weights typically ranging from 18,500 to 19,500 kg (40,785 to 42,990 lb) depending on the specific blade and undercarriage configuration, and is available in standard and low-ground-pressure (PX) variants.
Across the D65 series generations, Komatsu progressively increased engine power, refined the torque converter and transmission for better fuel efficiency, and upgraded the undercarriage durability for extended life. The DRP060-4A-EX (D65EX-12) remains significant in the used and parts market because it bridges the gap between older Tier 3 mechanical systems and modern Tier 4 emissions requirements. Its widespread use in mining and large-scale construction means a robust aftermarket ecosystem exists for undercarriage components, hydraulic pumps, and engine rebuild kits, making it a cost-effective option for fleet expansion or replacement.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) specifications
Engine
| Model | S6D107E-1 |
| Net Power | 126 kW (169 hp) @ 2,200 rpm |
| Emissions Standard | EU Stage IV |
Weights
| Operating Weight (D65EX-12) | 18,520 kg (40,829 lb) |
| Operating Weight (D65PX-12) | 19,460 kg (42,902 lb) |
Dimensions
| Track Shoe Width | varies by configuration/series |
| Ground Clearance | not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speed | not documented for this exact serial range — verify with your dealer |
| Drawbar Pull | not documented for this exact serial range — verify with your dealer |
| Gradeability | not documented for this exact serial range — verify with your dealer |
| Ground Pressure | not documented for this exact serial range — verify with your dealer |
Blades
| Blade Type | Semi-U (SU) |
| Blade Capacity | 3.4 m³ (4.45 cu yd) |
Service Capacities
| Fuel Tank | not documented for this exact serial range — verify with your dealer |
| Hydraulic System | not documented for this exact serial range — verify with your dealer |
| Engine Oil | not documented for this exact serial range — verify with your dealer |
| Cooling System | not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize the Komatsu Oil Wear Analysis (KOWA) program at every 500-hour service interval to monitor engine oil, hydraulic fluid, and coolant health. Track wear metals (iron, copper, lead) in the engine oil to detect internal component wear early. Monitor hydraulic fluid particle count and viscosity to prevent pump and valve failures. Check coolant pH and SCA concentration to avoid corrosion in the D65EX-12 cooling system. Use KOMTRAX telematics to track load frequency and fuel burn, identifying inefficient operating cycles that accelerate fluid degradation.
Corrective & Common Repairs
Address frequent undercarriage wear on the D65EX-12 by regularly measuring sprocket, idler, and roller dimensions during 500-hour inspections. Replace hydraulic return filters at 500 hours to prevent contamination of the main hydraulic pump. Inspect and clean the turbocharger at 1,000 hours to ensure proper airflow and prevent soot buildup. Check and torque ROPS bolts and cutting edge bolts at 2,000 hours to maintain structural integrity. Replace engine oil and filters every 250 hours to protect the SAA6D107E-1 engine from sludge and wear.
Overhaul & Rebuild Points
Plan for major powertrain overhaul around 10,000-12,000 hours, focusing on the torque converter, transmission clutches, and final drive gears. Inspect the D65EX-12 engine cylinder liners, pistons, and valves during major service intervals, replacing worn components as needed. Check the hydraulic pump and motor case drain filters for metal particles indicating internal wear. Evaluate the undercarriage for excessive wear on track chains and rollers, replacing them before they damage the final drive sprockets. Consider KDPF regeneration and cleaning schedules to maintain engine performance.
Seasonal & Environment Servicing
In cold climates, use Komatsu Super Coolant AF-NAC at the correct concentration to prevent freezing and overheating. Check battery fluid levels and charge status regularly in extreme temperatures. In dusty environments, inspect the air filter restriction indicator frequently and clean or replace the outer element as needed to prevent engine damage. Clear debris from the radiator and oil cooler fins daily to maintain proper cooling. In wet conditions, check track tension to prevent slippage and excessive wear, and inspect seals on hydraulic cylinders for water intrusion.
DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify voltage at the pin connector |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the battery or alternator and check the voltage regulator |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator | Replace the alternator or battery and check the voltage regulator |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring short | Verify the intake pressure sensor and wiring integrity |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor feedback voltage too high | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor feedback voltage too low | Sensor malfunction | Replace or test the IAT sensor |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and engine load cycle |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter element |
| B@BCNS | Engine coolant overheating | Low coolant level, radiator blockage, or fan belt failure | Check radiator fins, fan belt, and coolant level |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) attachments & work tools
Blades
The Komatsu DRP060_4A_EX (D65EX-12) series supports Semi-U (SU) and Straight (S) blade configurations. VPAT (Variable Pitch Angle Tilt) blade availability is not documented for this specific serial range in the provided sources. Typical widths and capacities vary by configuration and series.
Rippers
The machine is equipped with a rear ripper assembly, as indicated by the 'REAR WORK EQUIPMENT CONTROL (PIPING) (RIPPER)' documentation. Multi-shank and single-shank options for this class are not specified in the provided text. Ripper weights are not documented for this exact serial range.
Winches
Winch class and towing winch options for the DRP060_4A_EX are not documented in the provided sources. Compatibility with front or rear mounting points is not specified.
Drawbars/Counterweights
Drawbar and counterweight specifications for the DRP060_4A_EX are not documented in the provided sources. Compatibility with forestry or waste configurations is not specified.
Cab/ROPS Guarding
Forestry and waste configuration guarding options for the DRP060_4A_EX are not documented in the provided sources. Specific ROPS guarding details are not available.
Hydraulic Arrangement
The DRP060_4A_EX utilizes a rear work equipment control piping system for the ripper. Front and rear tool hydraulic arrangement notes are not detailed in the provided sources.
All DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) assemblies by section
Every catalogued assembly group for the Komatsu DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Hydraulic System
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (1/6)
| 01***75 | Bolt,(For D57sr) | 2 |
| 01***95 | Bolt,(For Reversible Fan) | 1 |
| 01***20 | Bolt, Mount Spool Covers | 10 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (2/6)
| 07***05 | O-Ring (K1) | 2 |
| 07***18 | O-Ring, Divider Valve Mounting | 1 |
| 07***05 | Ring,Back-Up | 2 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (3/6)
| 07***16 | O-Ring,Suction And Relief Valve | 1 |
| 07***16 | O-Ring | 1 |
| 07***16 | Ring, Back-Up | 2 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (4/6)
| 07***05 | O-Ring (K1) | 1 |
| 07***30 | O-Ring,Boom (For 50 Feet Long Front) | 1 |
| 07***35 | O-Ring, Upper Cooler Inlet And Outlet Ports | 1 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (5/6)
| 01***75 | Bolt,(For D57sr) | 1 |
| 01***85 | Screw | 3 |
| 01***20 | Bolt, Mount Spool Covers | 4 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Control Valve (4-Spool) (With Ripper) (6/6)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 1 |
| 70***01 | Valve Ass'Y,Suction And Safety | 1 |
| 70***90 | O-Ring,Suction | 2 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Rear Hydraulic Line (Ripper Bracket)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***70 | Bolt, Accumulator Mounting Bracket | 5 |
| 01***85 | Bolt | 2 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Hydraulic System : Rear Hydraulic Line (Ripper Piping)
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
Operator'S Compartment And Control System
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Operator'S Compartment And Control System : Fire Extinguisher : Unit_01_of_02
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 4 |
| 01***23 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Operator'S Compartment And Control System : Fire Extinguisher : Unit_02_of_02
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 4 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 4 |
| 09***10 | Extinguisher,(With Extinguisher) | 1 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Operator'S Compartment And Control System : Rear Work Equipment Control (P.P.C. Valve) (For Ripper Or Aux. Farming Tool)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 07***20 | O-Ring,Relief Valve | 4 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Operator'S Compartment And Control System : Rear Work Equipment Control (Piping) (Ripper)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Work Equipment
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Work Equipment : Ripper (Riged Type)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 16 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 4 |
| 01***80 | Bolt | 10 |
Komatsu : Drp060_4a_ex(S/N 60001-60941-Up (D65ex-12)) : Work Equipment : Ripper Cylinder
| 01***55 | Bolt,(For Shipping) | 12 |
| 01***11 | Nut,(With Under Mirror) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) serial number reference
The PIN plate is riveted to the front frame casting, typically on the operator's left side near the radiator support. The prefix is the first three characters of the 17-character ISO PIN stamped on the emissions/export plate.
| Prefix | Identifies | Notes |
|---|---|---|
| DRP | DRP060-4A-EX | Crawler dozer family; 4th generation (-4A); LGP/wide-track configuration (-EX). Serial range 60001-60941-UP. Corresponds to D65EX-12 chassis. S/N 60001-60941-UP uses S6D125E-1 engine. S/N 60942-UP uses S6D125E-2 engine. Confirm with dealer for exact engine mapping per serial break. |
Frequently asked questions
What engine does the Komatsu DRP060-4A-EX (D65EX-12) use?
The Komatsu DRP060-4A-EX (D65EX-12) uses the Komatsu SAA6D107E-1 diesel engine, which is Tier 4 Final compliant.
What is the operating weight of the Komatsu DRP060-4A-EX?
The operating weight varies by configuration, typically ranging from 18,500 kg to 19,500 kg (40,785 lb to 42,990 lb).
What model replaced the Komatsu D65EX-12?
The D65EX-12 was succeeded by the D65EX-15 and later the D65EX-18 generations.
What DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12))?
What undercarriage and wear patterns are typical for this machine type?
Are there known engine quirks for the D65EX-12 series?
What are common electrical and sensor issues?
What should be checked when buying a used DRP060_4A_EX(S/N 60001-60941-UP (D65EX-12))?
What are the recommended fluid specifications for this machine?
What safety-critical fixes require dealer verification?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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