Komatsuengine(no series)

Komatsu 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER))

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu 6D95L-1AA-T engine powers the D31E-20 series trimming dozer, a specialized heavy crawler dozer designed for fine grading and earthmoving. This inline-six diesel unit is part of the 95 Series family, produced from the mid-1980s through the early 2000s. The machine operates in the heavy earthmoving class with an operating weight range of approximately 20,000 to 60,000 lb depending on configuration. The 6D95L-1AA-T succeeded earlier 6D95L variants and was eventually replaced by the SAA6D95LE series as emissions standards tightened. Configurations included standard and low-ground-pressure tracks, with the specific S/N 29222-UP range designated for trimming dozer applications.

Across the 95 Series generations, the 6D95L-1AA-T evolved from mechanical injection to more refined fuel delivery systems while maintaining a robust cast-iron block and inline-six architecture. The machine remains significant in the used and parts market due to its widespread deployment in mining and civil infrastructure projects. Its modular design allows for extensive aftermarket support, and the engine's durability in high-torque applications keeps it relevant for rebuild. The specific serial range 29222-UP represents a mature production phase with established service procedures and readily available overhaul components.

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 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) specifications

Engine

Model6D95L-1AA-T
ConfigurationTrimming Dozer (S/N 29222-UP)
Arrangement6 cylinder in-line
Displacement4.890 liter (298.3 cu in)
Bore95 mm (3.74 in)
Stroke115 mm (4.53 in)
Gross Power59 kW (79 hp) @ 2500 rpm
Torque265-270 Nm (195-199 lbf-ft) @ 1400 rpm
Emissions TierTier 2 / Stage II

Weights

Engine Weight420-430 kg (926-948 lb)

Dimensions

Engine Length1056-1075 mm (41.6-42.3 in)
Engine Width620-625 mm (24.4-24.6 in)
Engine Height1093-1100 mm (43.0-43.3 in)

Performance

TurbochargerTurbocharged

Service capacities (summary)

NoteFluid capacities not documented for this specific engine serial range in source text; verify with Komatsu shop manual.

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

Komatsu 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition
  • Check hydraulic fluid level via sight glass
  • Check coolant level and ensure cap is secure
  • Drain water from fuel separator
  • Check air filter restriction indicator
  • Inspect hydraulic hoses for cracks or leaks
Every 250 h
  • Change engine oil and filter
  • Grease all lubrication points including blade and ripper pivots
  • Check fluid levels across all systems
  • Inspect air filter outer element
  • Inspect belts and hoses for wear
  • Perform visual walk-around inspection
Every 500 h
  • Replace fuel filter
  • Replace hydraulic return filter
  • Test battery and alternator load
  • Test coolant SCA concentration
  • Collect KOWA oil sample for analysis
  • Measure undercarriage wear
Every 1,000 h
  • Clean or replace air filter outer element
  • Change final drive oil on both sides
  • Inspect turbocharger condition
  • Check valve adjustment clearances
  • Inspect structural welds and components
  • Sample hydraulic oil for analysis
Every 2,000 h
  • Change hydraulic system oil
  • Flush and replace coolant
  • Replace worn belts and hoses
  • Torque ROPS and ROPS bolts
  • Check cutting edge and end bit bolt torque
  • Perform comprehensive component evaluation

Servicing the 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA fluid analysis at every 500-hour interval to monitor iron, copper, and lead wear metals in the 6D95L-1AA-T engine oil. Track coolant pH and SCA concentration to prevent liner cavitation in the inline-six block. Monitor hydraulic oil particle count and viscosity to detect pump wear early. Analyze final drive oil for gear tooth wear metals. Use KOMTRAX telematics to track engine load frequency and fuel burn rates, identifying inefficiencies before they cause component failure. Early detection of coolant contamination or fuel dilution prevents catastrophic engine damage.

Corrective & Common Repairs

Address hard-starting issues by inspecting the mechanical injection pump and fuel lines for air leaks or clogged filters. Replace worn piston rings and cylinder liners if compression drops below spec. Repair turbocharger shaft play or seal leaks to restore boost pressure. Fix hydraulic pump cavitation by replacing inlet filters and checking suction lines. Replace worn undercarriage components like track shoes and idlers to maintain traction and reduce ground pressure. Address electrical faults by testing the alternator and starter motor connections for corrosion or loose terminals.

Overhaul & Rebuild Points

Perform a complete engine overhaul when compression loss exceeds limits or oil consumption becomes excessive. Replace the cylinder head gasket, valve seals, and valve springs during disassembly. Recondition or replace the crankshaft if main or rod bearing journals show scoring or out-of-round wear. Inspect the turbocharger housing and impeller for damage. Rebuild the hydraulic pumps and valves if flow or pressure tests fail. Replace all engine mounts and seals during reassembly to prevent leaks and vibration issues.

Seasonal & Environment Servicing

In cold climates, use low-temperature grade engine oil and ensure the coolant mixture provides adequate freeze protection. Check the battery charge regularly as cold temperatures reduce capacity. In dusty environments, inspect the air filter restriction indicator more frequently and clean the radiator and oil cooler fins daily to prevent overheating. In sandy conditions, seal all intake and exhaust openings during storage to prevent contamination. Adjust undercarriage tension for soft ground to prevent track derailment and reduce wear on rollers and sprockets.

6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) common service parts

Part numberPart
07281-00197Clamp,(With Pre-Fuel Filter)Check fitment →
600-311-6220Cartridge,Fuel FilterCheck fitment →
600-311-9600Fuel Filter Ass'YCheck fitment →
07000-02135O-Ring,Hydraulic Oil FilterCheck fitment →
600-211-6240Cartridge,Engine Oil Filter (D31s)Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine speed sensor and backup speed sensor failureFaulty crankshaft speed sensor, damaged wiring harness, or corroded connector pins at the ECM or sensor interface.Inspect the speed sensor air gap and wiring integrity. Test sensor resistance and signal voltage. Replace the sensor if the signal is absent or erratic.
CA111Engine controller internal faultCritical internal failure within the Electronic Control Module (ECM), often due to power surges, water intrusion, or component aging.Verify ECM power and ground connections are clean and tight. If connections are secure, the ECM likely requires replacement or reprogramming by a dealer.
CA451Common rail pressure sensor feedback value too highFaulty high-pressure fuel rail sensor, shorted sensor wiring, or actual overpressure condition in the fuel system.Check the sensor wiring for shorts to power. Verify fuel rail pressure with a mechanical gauge. Replace the sensor if the electrical circuit is intact but readings remain erroneous.
CA452Common rail pressure sensor feedback value too lowFaulty high-pressure fuel rail sensor, open sensor wiring circuit, or low fuel pressure due to supply pump issues.Inspect the sensor connector for corrosion or loose pins. Check the fuel supply line for restrictions. Replace the sensor if the circuit is valid but the signal is out of range.
CA122Intake air pressure sensor feedback voltage too highFaulty intake manifold pressure sensor, shorted signal wire, or sensor internal failure.Disconnect the sensor and check for voltage on the signal wire with the key on (indicating a short to power). If the wire is clear, replace the sensor.
CA123Intake air pressure sensor feedback voltage too lowFaulty intake manifold pressure sensor, open signal wire, or disconnected sensor hose.Verify the vacuum/pressure hose is connected and not leaking. Check the sensor connector for open circuits. Replace the sensor if the wiring is intact.
CA153Intake air temperature sensor feedback voltage too highFaulty intake air temperature (IAT) sensor, shorted signal wire, or sensor internal failure.Inspect the IAT sensor connector for damage. Check the wiring harness for shorts to the 5V supply. Replace the sensor if the circuit is functional.
CA154Intake air temperature sensor feedback voltage too lowFaulty intake air temperature (IAT) sensor, open signal wire, or disconnected sensor.Check the sensor connector for corrosion or loose pins. Verify the wiring harness continuity. Replace the sensor if the electrical path is valid.
CA441Battery voltage too lowWeak or discharged battery, failing alternator, loose battery cables, or high parasitic drain.Check battery terminal tightness and corrosion. Test the charging system output with the engine running. Replace the battery or alternator as needed.
CA442Battery voltage too highFailing voltage regulator in the alternator, loose alternator ground, or regulator internal fault.Measure charging voltage at the battery with the engine at high idle. If voltage exceeds specifications, inspect the alternator regulator and ground connections. Replace the alternator if faulty.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) attachments & work tools

Standard Trimming Blade

The primary work tool for this machine is a standard semi-U or U-shaped dozer blade designed for fine grading and trimming operations. Typical blade widths for this engine class range from 2.41 m to 2.74 m (7 ft 11 in to 9 ft), with capacities varying by configuration/series depending on the specific dozer frame (e.g., D31E or D31P) associated with the S/N 29222-UP range. Factory guarding options often include side cutters and wear plates to extend blade life during heavy trimming.

Multi-Function / Dozer Blade

Multi-function blades (often called 6-in-1 or dozer blades) are available for this class, offering angle, tilt, and pitch capabilities for versatile material handling. These tools typically require a high-flow hydraulic kit or specific valve arrangements to operate the additional cylinder functions beyond standard lift and tilt. Sizes generally align with the standard blade width range of 2.41 m to 2.74 m (7 ft 11 in to 9 in), varying by configuration/series.

Ripper / Ripper Attachment

Single-shank or multi-shank rippers are offered for soil penetration and loosening prior to grading. Mounting is typically via a standard dozer shank interface, requiring no additional hydraulic connections if mechanically mounted, though hydraulic rippers require auxiliary hydraulic lines. Shank configurations and depths vary by configuration/series based on the specific dozer model (D31E-20 or D31P-20) linked to the engine serial range.

Coupler / Mounting System

The machine utilizes a standard Komatsu dozer blade mounting system, often referred to as a 'quick attach' or 'pin-on' interface depending on the specific dozer model (D31E-20 or D31P-20) associated with the S/N 29222-UP range. This system allows for the rapid swapping of blades, rippers, and other attachments without tools. The specific pin sizes and mounting geometry vary by configuration/series and must be verified against the dozer frame, not just the engine.

Hydraulic Kit / Auxiliary Hydraulics

Work tools requiring auxiliary hydraulics (such as angle blades or hydraulic rippers) necessitate a factory-installed auxiliary hydraulic kit. This kit includes additional hydraulic lines, control valves, and often a higher-capacity pump or flow divider to maintain system pressure. The specific kit part numbers and flow rates vary by configuration/series and are dependent on the dozer model (D31E-20 or D31P-20) associated with the engine serial range.

All 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) assemblies by section

Every catalogued assembly group for the Komatsu 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Cooling System
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cooling System : Tension Pulley(#.-)
01***65Bolt, Mount Tube To Divider Valve1
01***12Bolt4
01***25Bolt,(With Corrosion Resistor)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cooling System : Tension Pulley(#29222-.)
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cooling System : Water Pump And Cooling Fan
01***20Bolt,(For Quick Shift) (Mitsubishi)6
01***16Screw5
01***20Screw2
See all parts with full part numbers in Heavy Parts AI →
Cylinder Block
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Camshaft And Tappet
01***75Bolt1
04***10Pin,Dowel1
62***10Tappet12
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Crankshaft
01***45Bolt,Nylock1
01***16Bolt,(With Alternator Cover Type)6
61***11Bolt,Nylock (K2)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Cylinder Block
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Flywheel And Flywheel Housing
01***45Bolt,(For Suction? Reversible Fan)2
01***40Bolt,(With Service Valve R.H.)6
01***30Bolt6
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Front Cover And Gear
01***75Bolt - Cab To Rops1
01***10Bolt1
01***16Bolt2
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Oil Pan
01***14Bolt,(W/Joy Stick Str.)(W/O Heater)30
01***14Bolt30
07***16Gasket,(For Pc750-6) (See Fig.A2110)2
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Block : Piston And Connecting Rod
04***12Ring, Snap12
62***21Piston (S)6
62***00Piston Ring Ass'Y,Per Cylinder6
See all parts with full part numbers in Heavy Parts AI →
Cylinder Head
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Air Cleaner And Connection
04***10Ring,See Fig. K4010-65a01
07***09Clamp,(With Cylinder Cover)2
09***62Plate? Instruction,(English-Russian)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Air Intake Manifold And Connection (For Russian)
01***12Bolt2
01***20Bolt,(For Japan Pc200)2
01***25Bolt,(With Corrosion Resistor)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Air Intake Manifold And Connection(#29222-40631)
01***12Bolt2
01***20Bolt,(For Japan Pc200)2
01***25Bolt,(With Corrosion Resistor)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Air Intake Manifold And Connection(#40632-)
01***12Bolt2
01***20Bolt,(For Japan Pc200)2
01***25Bolt,(With Corrosion Resistor)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Cylinder Head
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)4
01***32Washer, (Without Emergency Steering)25
02***04Plug, Pipe1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Cylinder Head Cover
07***09Clamp,(See Fig. K0210-16a0)2
61***10Cap, Oil Filler1
61***30Tube, Oil Filler1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Exhaust Manifold And Muffler
01***15Bolt1
01***25Grub Screw4
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Exhaust Manifold And Muffler (For Russian)
01***25Grub Screw4
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
01***45Bolt, Bracket Mounting12
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Cylinder Head : Rocker Arm
01***12Bolt,(Without R.P.C.U.)1
01***65Bolt,(For Alternator Bracket Mount)8
61***30Nut12
See all parts with full part numbers in Heavy Parts AI →
Electrical System
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Electrical System : Alternator (13a)
60***60Alternator A. (13a),(With Non Hardening Pulley)1
KD***31Bushing,Insulator2
KD***80Packing1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Electrical System : Alternator (13a) (For Russian)
60***71Alternator A. (13a),(With Hardening Pulley)1
KD***31Bushing,Insulator2
KD***80Packing1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Electrical System : Alternator And Mounting (13a)
01***50Bolt1
01***40Bolt,(Shim 3-Piece)1
01***20Bolt,(For Japan Pc200)2
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Electrical System : Starting Motor (5.5kw)
60***50Starting Motor Ass'Y,(5.5kw)1
KD***30Bracket,Center1
KD***20Cneter Bracket A1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Electrical System : Starting Motor And Mounting (5.5kw)
01***30Bolt2
07***05O-Ring,(Not Used With Emergency Str.) (K2)1
(6***0)Starting Motor Ass'Y,(5.5kw) (See Fig.A6210-B0a5)1
See all parts with full part numbers in Heavy Parts AI →
Engine Kit
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Engine Kit : Gasket Kit
01***12Washer,Lock? Injection Gear1
07***05O-Ring,(Not Used With Emergency Str.) (K2)2
07***35O-Ring,Hydraulic Oil Filter1
See all parts with full part numbers in Heavy Parts AI →
Fuel System
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Filter And Piping
01***85Bolt2
07***12Gasket,Mechanical Pump Piping1
07***12Gasket,(Without Air Compressor Type) (K1)4
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump (Feed Pump)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***10Feed Pump Ass'Y,(Not Shown)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump (Governor) (1/2)
DK***00Shim? 2.00mm,(High Altitude Spec.)0
DK***00Adapter1
DK***80Nut1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump (Governor) (2/2)
DK***40Gasket,Air Compressor2
DK***00Nut,Cap1
DK***20Cover1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump (Pump) (1/2)
62***50Injection Pump Ass'Y1
62***51Injection Pump Ass'Y1
DK***30Key,Woodruff1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump (Pump) (2/2)
DK***40Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-00400
DK***90Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-05900
DK***00Sleeve,Control6
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Injection Pump And Piping
01***35Stud4
01***25Screw4
01***12Bolt,(See Fig.0501)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Fuel Nozzle And Spill Pipe
01***35Bolt, Mount Bracket To Floor6
07***10Tube,(See Fig.0421-14)5
07***50Tube,Spill1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Fuel System : Water Separator And Piping
01***25Bolt,(With Corrosion Resistor)2
01***10Bolt2
07***60O-Ring,(For Pc750?800?1800) (A2610)1
See all parts with full part numbers in Heavy Parts AI →
Lubricating Oil System
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Lubricating Oil System : Lubricating Oil Filter
60***40Cartridge,Engine Oil Filter (D31s)1
60***41Cartridge,Engine Oil Filter (D31s)1
60***50Plate? Caution,(Russian-English)1
See all parts with full part numbers in Heavy Parts AI →
Komatsu : 6d95l-1aa-T(S/N 29222-Up (For Trimming Dozer)) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe
01***12Bolt,(See Fig.0501)1
01***16Screw6
01***25Bolt,(With Corrosion Resistor)1
See all parts with full part numbers in Heavy Parts AI →

6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) serial number reference

The PIN plate is located on the front frame casting, typically on the operator's left side near the radiator support. Read the three-character prefix at the start of the serial number to identify the specific build series.

PrefixIdentifies
D31E-20Trimming Dozer
D31P-20Trimming Dozer

Frequently asked questions

What is the engine model for the D31E-20 trimming dozer?

The D31E-20 trimming dozer uses the Komatsu 6D95L-1AA-T inline-six diesel engine for serial numbers 29222 and up.

What is the operating weight of the D31E-20 dozer?

The operating weight varies by configuration and attachment, typically ranging from 20,000 to 60,000 lb depending on track type and counterweight.

What engine replaced the 6D95L-1AA-T?

The 6D95L-1AA-T was replaced by the SAA6D95LE series engines to meet stricter emissions standards.

What 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) owners discuss

What are the known powertrain and hydraulic behaviors for the Komatsu 6D95L-1AA-T engine in trimming dozers?
The 6D95L-1AA-T is a 5.0L inline-6 turbocharged diesel engine producing approximately 81 kW (109 hp) at 2,000 RPM with an estimated torque of 400–450 N·m (295–332 lb·ft). It uses mechanical injection. The engine is paired with a hydraulic system that is sensitive to oil temperature; functions may become weak when hot due to internal leakage in pumps, valves, or cylinders as viscosity decreases. The machine is designed for smooth operation and fuel efficiency, but hydraulic performance must be verified cold and hot to distinguish between pump wear and engine power loss.
What undercarriage or wear patterns are typical for this machine type?
Trimming dozers experience high stress on the undercarriage due to constant side-loading and track tension adjustments. Common wear patterns include track-chain elongation, roller failure, and track loosening. The machine may pull to one side if track tension is uneven or if debris packs into the undercarriage. Final drives and travel motors are prone to noise and failure if oil levels are low or contaminated. Regular inspection of track tension and roller condition is critical to prevent repeated loosening and premature component wear.
What are the engine quirks per the 6D95L-1AA-T series?
The 6D95L-1AA-T series is known for robust torque output but requires strict adherence to oil level monitoring. Running the engine low on oil can lead to spun rod bearings, particularly on cylinders #3 and #4. The engine block and oil pan are sealed with silicone rather than gaskets, which can be a point of failure if not properly applied during service. The engine is also sensitive to air entering the fuel supply, which can cause hard starting or power loss under load.
What are common electrical or sensor issues?
Common electrical issues include battery voltage collapse under load, which can mimic starter failure. Ground connections between the engine and chassis must be checked for corrosion. Multiple fault codes often point to battery or ground issues rather than component failure. The engine monitoring system (KOMTRAX) can be used to track parameters, but sensor data must be cross-referenced with physical tests to avoid misdiagnosis. Electrical faults can also cause sudden derating, which requires checking warning codes and safety interlocks.
What to check when buying a used 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER))?
Verify the engine serial number prefix matches the 29222-Up range for the 6D95L-1AA-T configuration. Check for signs of oil starvation, such as spun rod bearings. Inspect the cooling package for packed debris between heat exchangers. Test hydraulic performance cold and hot to identify internal leakage. Check undercarriage wear, track tension, and final drive noise. Verify the battery and ground connections. Ensure the engine starts and holds RPM under load without excessive smoke or power loss. Confirm the serial number matches the correct parts catalog for this specific trim dozer application.
What are the recommended fluids for this engine?
Use Komatsu Genuine Diesel Engine Oil (EO/TO/AXO/HO specifications) and Komatsu Super Coolant AF-NAC. Hydraulic oil must meet Komatsu Engineering Standards. Axle oil and powertrain oil must also meet Komatsu specifications. Using non-compliant fluids can lead to premature wear and voided warranties. Always consult the operation and maintenance manual for the specific viscosity grade based on ambient temperature.
How should the engine be maintained to prevent catastrophic failure?
Follow the Komatsu service schedule for oil, filter, coolant, and fuel system maintenance. Perform regular valve adjustments and air cleaner replacements. Monitor engine parameters via KOMTRAX to detect issues early. For long-term storage, drain fluids, fog cylinders, and seal intake/exhaust to prevent corrosion. Ensure technicians are trained on 6D95L-specific procedures to avoid improper assembly or torque settings. Have your dealer verify critical torque values and assembly procedures for the cylinder head bolts, crankshaft mains, and connecting rods.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

Need a specific 6D95L-1AA-T(S/N 29222-UP (FOR TRIMMING DOZER)) part?

Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.