Komatsuengine(no series)

Komatsu 6D95L-1AD(S/N 96999-UP)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu 6D95L-1AD engine (S/N 96999-UP) is a 6-cylinder, in-line, water-cooled, direct-injection diesel powerplant used in mid-size Komatsu construction equipment, primarily the GD305-A-1A grader and select excavator/dozer platforms from the 1990s and early 2000s. It delivers approximately 82 to 90 flywheel horsepower at 2,150 to 2,250 rpm with a maximum torque of 28 kgm (203 ft·lbf) at 1,500 rpm. The engine displaces 4,890 cm³ with a bore and stroke of 95 mm x 115 mm. It weighs approximately 360 kg (794 lb) dry and utilizes a Bosch VE distributor-type fuel injection pump with a mechanical all-speed governor. This engine replaced earlier 6D95 variants in the Komatsu 95 series lineup and was succeeded by electronically controlled Tier-compliant engines in later model generations.

Across its production life, the 6D95L-1AD evolved from mechanical injection to meet evolving emissions standards, with later variants introducing turbocharging and upgraded cooling capacities. The S/N 96999-UP designation identifies a specific production block often associated with the GD305-A-1A grader application. In the used and parts market, this engine remains highly relevant due to its simple mechanical architecture, which allows for straightforward field repairs and rebuilds. Its widespread use in graders and older excavators ensures a robust aftermarket supply of components, making it a cost-effective power unit for fleet maintenance and long-term equipment preservation.

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-1AD(S/N 96999-UP) specifications

Engine

Model6D95L-1 (per factory spec sheet for this serial range)
Gross/Net Power82 HP (61 kW) @ 2,150 rpm; 85 HP (63 kW) @ 2,150 rpm; 90 HP (67 kW) @ 2,250 rpm; 95 HP (71 kW) @ 2,250 rpm; 110 HP (82 kW) @ 2,000 rpm (varies by configuration/series)
Displacement4.890 L (298 cu in)
Cylinders6 in-line
Bore x Stroke95 mm x 115 mm (3.74 in x 4.53 in)
Emissions TierTier 1 / Stage II (per rebuilt engine listing)

Weights

Dry Weight345–430 kg (761–948 lb) (varies by configuration/series)

Dimensions

Overall Length983–1,075 mm (38.7–42.3 in) (varies by configuration/series)
Overall Width586–637 mm (23.1–25.1 in) (varies by configuration/series)
Overall Height809–1,100 mm (31.9–43.3 in) (varies by configuration/series)

Performance

Maximum Torque28–41.5 kgm (203–300 ft·lb) @ 1,500 rpm (varies by configuration/series)
High Idling Speed2,200–2,500 rpm (varies by configuration/series)
Low Idling Speed700 rpm
Minimum Fuel Consumption160 g/HPh

Service capacities (summary)

Lubricating Oil Capacity11–13 L (2.9–3.4 gal) (varies by configuration/series)
Coolant Capacity7.5–18 L (2.0–4.8 gal) (varies by configuration/series)

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

Komatsu 6D95L-1AD(S/N 96999-UP) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level at sight glass.
  • Check coolant level and ensure cap is secure.
  • Check fuel level and drain water from separator.
  • Check air filter restriction indicator.
  • Inspect hydraulic hoses for cracks or leaks.
Every 250 h
  • Change engine oil and filter.
  • Grease all points (boom, stick, bucket, swing bearing).
  • Check and top off all fluid levels.
  • Inspect belts, hoses, and clamps.
  • Clean debris from radiator and oil cooler fins.
  • Check track tension and shoe/pad condition.
Every 500 h
  • Replace fuel filter and drain water separator.
  • Replace hydraulic return filter.
  • Test battery and alternator load.
  • Test coolant SCA concentration.
  • Collect KOWA oil sample for analysis.
  • Perform detailed undercarriage visual inspection.
Every 1,000 h
  • Replace air filter outer element.
  • Change final drive oil (both sides).
  • Inspect turbocharger condition.
  • Check valve adjustment clearances.
  • Measure undercarriage wear components.
  • Inspect structural welds on boom and stick.
Every 2,000 h
  • Change hydraulic system oil.
  • Flush and replace coolant.
  • Replace worn belts and hoses.
  • Perform comprehensive component evaluation.
  • Check swing machinery oil level and condition.
  • Torque ROPS and structural bolts.

Servicing the 6D95L-1AD(S/N 96999-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize Komatsu KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead) and coolant contaminants. Check coolant SCA concentration at 500 hours to prevent liner cavitation. Monitor hydraulic oil particle count and viscosity during 1,000-hour services. Track fuel dilution and soot levels in engine oil samples to adjust oil change intervals if operating in high-dust or heavy-load conditions. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates.

Corrective & Common Repairs

Address hard-starting issues by inspecting the Bosch VE distributor pump and governor linkage for wear. Replace the fuel filter and drain the water separator if water contamination is suspected. Check the air filter restriction indicator and replace the outer element at 1,000 hours or when clogged. Inspect the turbocharger shaft play and seal condition during 1,000-hour services. Verify battery terminal integrity and alternator output (24V, 15A or 25A) during 500-hour checks. Replace worn piston rings or cylinder liners if compression loss exceeds specifications.

Overhaul & Rebuild Points

Plan a major overhaul when valve clearance adjustments become frequent or when compression drops below acceptable limits. Inspect the cylinder block and head gasket surfaces for leaks during coolant flushes at 2,000 hours. Measure crankshaft main bearing clearance and connecting rod end play during disassembly. Replace the timing gear set if wear is detected in the camshaft or crankshaft gears. Rebuild the fuel injection pump if fuel delivery pressure is inconsistent. Replace the water pump and thermostat if cooling efficiency declines.

Seasonal & Environment Servicing

In cold climates, verify coolant freeze protection and use appropriate viscosity engine oil (Komatsu EO or equivalent) to ensure cold starts. Drain water from the fuel separator daily in humid or wet conditions to prevent microbial growth. In dusty environments, clean the radiator and oil cooler fins daily and inspect the air filter more frequently than the standard 1,000-hour interval. Check track tension and undercarriage wear more often on abrasive surfaces. Ensure the battery is insulated or heated in extreme cold to maintain cranking power.

6D95L-1AD(S/N 96999-UP) common service parts

Part numberPart
07281-00197Clamp,(With Pre-Fuel Filter)Check fitment →
600-311-7440Cartridge,Fuel FilterCheck fitment →
6206-73-6200Fuel Filter Ass'YCheck fitment →
600-311-6220Cartridge,Fuel FilterCheck fitment →
09637-30262Plate? Instruction,Air Cleaner (Double Element)Check fitment →

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6D95L-1AD(S/N 96999-UP) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify the voltage at the pin connector
CA111Internal engine controller faultECM internal abnormalityReplace or reprogram the ECM
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA441Battery voltage too lowAlternator or battery failure; voltage regulator issueReplace the alternator or battery; check the voltage regulator
CA442Battery voltage too highAlternator or battery failure; voltage regulator issueReplace the alternator or battery; check the voltage regulator
CA122Intake air pressure high voltageIntake pressure sensor malfunction or wiring issueVerify the intake pressure sensor and wiring
CA123Intake air pressure low voltageSensor short or airflow restrictionCheck for a sensor short or an airflow restriction
CA234Engine overspeedThrottle calibration error, engine load cycle issue, or operator misuseVerify throttle calibration, engine load cycle, or operator misuse
CA2311IMV solenoid valve failureIMV solenoid malfunction or wire harness issueReplace the IMV solenoid or inspect the wire harness
AA10NXAir cleaner cloggingClogged air filter elementReplace the air filter

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

6D95L-1AD(S/N 96999-UP) attachments & work tools

Bulldozer Blade Configurations

The 6D95L-1 engine powers the D31P-18 series dozers, which utilize a semi-universal (SU) or straight (S) blade configuration. Factory guarding options include heavy-duty side cutters and corner protectors for abrasive terrain. Blade capacity varies by configuration, typically ranging from 2.5 to 3.5 cubic yards for this class.

Excavator Work Tools

Compatible with the PC120-3 and PC200-6 series excavators, supporting standard digging buckets, trenching buckets, and rock buckets. Coupler systems include fixed pin or hydraulic quick-attach mounts depending on the specific chassis generation. Bucket capacities vary by configuration/series, generally ranging from 0.5 to 1.2 cubic meters for this engine class.

Grader Blade & Ripper Options

The GD305-A-1A grader utilizes the 6D95L-1HH variant (serial 96999-Up) and supports moldboard blades with adjustable angle and tilt. Ripper options include single or multi-shank rear-mounted rippers for soil preparation. Blade width and ripper depth are determined by the specific grader model configuration.

Hydraulic Kit Requirements

Work tools requiring auxiliary hydraulics (e.g., tilt rotators, hydraulic breakers) must match the machine's factory hydraulic circuit arrangement. Kits typically include high-pressure hoses, control valves, and mounting brackets specific to the boom or arm configuration. Availability varies by configuration/series as older models may require retrofitting.

Engine Mounting & Coupling

The 6D95L-1 engine mounts via a standard flywheel housing and bellhousing interface compatible with Komatsu powertrain assemblies. Coupling to the transmission or final drive is achieved through a torque converter or direct mechanical link depending on the machine type. Specific mounting bolt patterns and alignment shims are defined by the host machine's service manual.

All 6D95L-1AD(S/N 96999-UP) assemblies by section

Every catalogued assembly group for the Komatsu 6D95L-1AD(S/N 96999-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine
Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Cleaner
01***30Screw2
01***06Nut6
04***10Ring,See Fig. K4010-65a01
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Cleaner (Air Connector Elbow Type)
04***10Ring,See Fig. K4010-65a01
07***09Clamp,(With Cylinder Cover)2
60***11Washer,Seal (K26)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Cleaner (High Altitude Spec.)
01***20Bolt,(For Japan Pc200)4
04***10Ring,See Fig. K4010-65a01
07***09Clamp, Hose - At Water Pump1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Cleaner (With Extension)
04***10Ring,See Fig. K4010-65a01
07***09Clamp,(With Cylinder Cover)2
60***11Washer,Seal (K26)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (For 13a? 25a Alternator)
01***30Screw10
01***70Bolt4
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator With Water Separator) (Noise Suppression Spec.)
01***30Screw10
01***70Bolt4
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator)
01***30Screw10
01***70Bolt6
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (For 15a Alternator) (Air Connector Elbow Type)
01***10Bolt (M10x1.50x10)4
01***30Screw10
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (High Altitude Spec.)
01***30Screw11
01***70Bolt2
01***85Bolt1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Air Intake (With Water Separator)
01***10Bolt (M10x1.50x10)2
01***30Screw10
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator (13a) (With Hardening Pulley) (Inner Parts)
60***71Alternator A. (13a),(With Hardening Pulley)1
KD***31Bushing,Insulator2
KD***80Packing1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator (15a) (With Non Hardening Pulley) (Inner Parts)
60***50Alternator A. (15a)1
KD***70Cover1
KD***30Retainer1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator (25a) (With Non Hardening Pulley) (Inner Parts)
60***40Alternator A. (25a)1
KD***57Bearing,Ball? Front1
KD***11Rear Bracket Ass'Y1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator Mounting (13a) (With Hardening Pulley)
01***50Bolt1
01***40Bolt,(Shim 3-Piece)1
01***20Bolt,(For Japan Pc200)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator Mounting (15a) (With Non Hardening Pulley)
01***35Screw1
01***55Bolt1
01***06Nut1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Alternator Mounting (25a) (With Non Hardening Pulley)
01***50Bolt1
01***40Bolt,(Shim 3-Piece)1
01***20Bolt,(For Japan Pc200)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Camshaft And Tappet
01***20Screw2
04***16Fitting Wedge1
06***06Bearing1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cooling Fan
01***45Bolt6
01***30Screw6
60***20Fan,Cooling1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cooling Fan (Reversible Fan Type)
01***45Bolt6
01***30Screw6
60***10Fan,(Reversible Type)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Crank Pulley (Hardening Pulley) (For 13a Alternator)
01***45Bolt,Nylock1
61***20Collar,Taper1
61***31Plate1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Crank Pulley (Non Hardening Pulley) (For 15a? 25a Alternator)
01***45Bolt,Nylock1
61***20Collar,Taper1
61***31Plate1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Crank Pulley (Non Hardening Pulley) (High Altitude Spec.)
01***45Bolt,Nylock1
61***20Collar,Taper1
61***31Plate1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Crankshaft
62***00Main Metal Ass'Y7
62***00Thrust Metal Ass'Y1
62***00Main Metal Ass'Y7
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Block
01***16Screw4
04***20Pin,Dowel (Welded)2
04***28Pin, Dowel - Transmission Case, Pin-Dowel2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Block (High Altitude Spec.)
04***20Pin,Dowel (Welded)2
04***28Pin, Dowel - Transmission Case, Pin-Dowel2
04***08Adapter Sleeves6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Block Gasket Kit
07***05O-Ring,(Not Used With Emergency Str.) (K2)2
07***35O-Ring,Hydraulic Oil Filter1
07***50O-Ring,Front Cover Plate1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Block Gasket Kit (High Altitude Spec.)
01***12Washer,Lock? Injection Gear1
01***16Washer,Lock? Injection Gear1
07***80O-Ring,Hydraulic Oil Filter1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Head
01***32Washer, (Without Emergency Steering)25
02***04Plug, Pipe1
07***08Plug, Expansion6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Head (High Altitude Spec.)
01***32Washer, (Without Emergency Steering)25
02***04Plug, Pipe1
07***08Plug, Expansion6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Head Gasket Kit
08***14Band,(For Additional Fuel Strainer)2
08***19Band,(Without Air Conditioner)2
61***30Gasket,Air Cleaner1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Cylinder Head Gasket Kit (High Altitude Spec.)
07***18O-Ring,Turbocharger Lubricating Pipe1
08***14Band,(For Additional Fuel Strainer)2
08***19Band,(Without Air Conditioner)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Damper
01***16Bolt,(With Alternator Cover Type)6
62***00Damper,(Except Japan Pc200)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Engine Mounting
01***45Bolt,(For Power Tilt Mech Angle)6
01***55Bolt, Mount Tube To Switch Pump5
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Exhaust Manifold
01***25Grub Screw4
01***45Bolt, Bracket Mounting12
61***50Nut4
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Exhaust Manifold (High Altitude Spec.)
01***25Grub Screw4
01***90Bolt,(For Large Fan)12
07***08Plug,(For W/O. Corrosion Resistor)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Flywheel
01***30Bolt6
06***04Bearing,Ball1
62***10Washer1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Flywheel Housing
01***30Bolt - Lower Oil Cooler Outlet Tubemounting11
07***15Plug1
61***32Seal? Rear (K2)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Front Cover
01***16Bolt2
01***16Screw3
01***65Bolt,(For 35a? 25a Alternator)15
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Front Cover (With Cover)
01***16Bolt2
01***20Bolt,(With Tachometer Outlet)9
01***16Screw3
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Front Hanger (For 13a? 25a Alternator)
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
62***50Hanger,Front (With Tension Pulley)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Front Hanger (For 15a Alternator)
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
62***30Hanger,Front (W/O Corrosion Resistor)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Front Power Take Off
06***07Bearing1
06***08Bearing,Ball1
07***12Gasket,(Without Air Compressor Type) (K2)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Filter (For 13a? 25a Alternator)
01***85Bolt2
01***15Bolt,(With Water Separator)2
01***16Washer,(With Water Separator)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Filter (For 15a Alternator)
01***20Bolt2
07***12Gasket,(Without Air Compressor Type) (K1)6
07***14Bolt,Joint2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Filter (High Altitude Spec.)
01***75Bolt,(For Shipping)2
01***00Bolt2
01***16Washer,(With Water Separator)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***10Feed Pump Ass'Y,(Not Shown)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Feed Pump) (Without Stop Motor) (Inner Parts)
DK***20Bolt, Joint1
DK***00Valve,Check2
DK***10Feed Pump Ass'Y,(Not Shown)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)
DK***00Shim? 2.00mm,(High Altitude Spec.)0
DK***00Adapter1
DK***20Capsule,Spring1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Without Stop Motor) (Inner Parts)
DK***42Governor Ass'Y1
DK***00Shim? 2.00mm,(High Altitude Spec.)0
DK***00Adapter1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)
DK***40Gasket,Air Compressor2
DK***00Nut,Cap1
DK***00Bushing1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Without Stop Motor) (Inner Parts)
DK***00Gasket1
DK***40Gasket,Air Compressor2
DK***00Nut,Cap1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)
62***40Injection Pump Ass'Y1
DK***30Key,Woodruff1
DK***30Bearing0
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Without Stop Motor) (Inner Parts)
62***80Injection Pump Ass'Y1
DK***30Key,Woodruff1
DK***30Bearing0
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)
DK***40Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-00400
DK***90Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-05900
DK***00Sleeve,Control6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Without Stop Motor) (Inner Parts)
DK***40Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-00400
DK***90Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-05900
DK***00Sleeve,Control6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump Lubricator
07***12Gasket,(Without Air Compressor Type) (K2)2
07***10Screw, Banjo Connector (M10-1.25x20)1
62***30Pipe,Oil1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump Mounting
01***35Grub Screw4
01***12Bolt,(See Fig.0501)1
01***20Bolt,(For Japan Pc200)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Injection Pump Mounting (Without Stop Motor)
01***35Grub Screw4
01***12Bolt,(See Fig.0501)1
01***16Bolt,(With Alternator Cover Type)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Return (For 13a? 25a Alternator) (For 15a Alternator With Water Separator)
01***16Bolt,(With Alternator Cover Type)1
01***50Bolt,(For Shipping)1
04***10Clip,(With Accumulator)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Return (For 13a? 25a Alternator) (Noise Suppression Spec.)
01***16Bolt,(With Alternator Cover Type)1
04***10Clip,(With Accumulator)2
07***05Tube1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Return (For 15a Alternator)
07***00Clip3
62***00Tube,Spill1
62***90Tube,Spill1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Fuel Return (High Altitude Spec.)
01***16Bolt,(With Alternator Cover Type)1
01***50Bolt,(For Shipping)1
01***85Bolt2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Head Cover
01***20Bolt,(For Japan Pc200)1
04***50Screw4
07***09Clamp,(See Fig. K0210-16a0)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Head Cover (High Altitude Spec.)
01***20Bolt,(For Japan Pc200)1
04***50Screw4
07***09Clamp,(See Fig. K0210-16a0)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Heater Switch
01***12Bolt2
01***20Bolt,(For Japan Pc200)2
01***25Bolt,(With Corrosion Resistor)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Holder (Inner Parts)
62***10Holder Ass'Y6
DK***00Shim? 0.75mm0
DK***00Shim? 1.200mm0
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Idler Gear
01***75Bolt - Cab To Rops1
04***20Ring, Snap1
06***06Bearing2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Injection Nozzle
01***35Bolt, Mount Bracket To Floor6
07***00Clip11
62***10Carrier6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Injection Piping
01***25Screw4
61***30Clip1
62***00Clip Ass'Y4
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Muffler
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
01***16Screw1
01***16Bolt,(With Alternator Cover Type)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Muffler (High Altitude Spec.)
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)3
01***25Bolt, Mount Engine Oil Drain To Fuel Tank3
01***45Bolt, Bracket Mounting3
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Muffler (Noise Suppression Spec.)
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
01***16Screw1
01***16Bolt,(With Alternator Cover Type)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Muffler Piping (High Altitude Spec.)
01***80Bolt, Mount Strainer Flange1
01***20Bolt,(For Japan Pc200)2
01***25Bolt,(With Corrosion Resistor)2
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Name Plate And Caution (English)
Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Name Plate And Caution (French-English)
09***62Plate? Instruction,Air Cleaner (Double Element)1
60***90Plate? Caution,(French-English)1
60***50Plate? Caution,(French-English)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Name Plate And Caution (German-English)
09***61Plate? Instruction,(German-English) (Not Shown)1
60***80Plate? Caution,(German-English)1
60***40Plate? Caution,(German-English)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Name Plate And Caution (Indonesian-English)
09***61Plate? Instruction,(Indonesian-English)(Not Shown1
60***50Plate? Caution,(Indonesian-English)1
60***20Plate? Caution,(English-Indonesian)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Name Plate And Caution (Spanish-English)
09***61Plate? Instruction,(Spanish-English) (Not Shown)1
60***70Plate? Caution,Oil Filter And Bypass Filter1
60***30Plate? Caution,(Spanish-English)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Filter
60***41Cartridge,Engine Oil Filter (D31s)1
60***42Cartridge,Engine Oil Filter1
62***10Nipple1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Level Gauge
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)1
01***20Screw1
01***06Nut1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Level Gauge (High Altitude Spec.)
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)1
01***25Bolt,(With Corrosion Resistor)1
01***06Nut1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Pan And Suction Tube
01***16Bolt, Mount Solenoid Valve30
01***12Bolt,(See Fig.0501)1
01***16Screw1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Pan And Suction Tube (High Altitude Spec.)
01***16Bolt, Mount Solenoid Valve30
01***12Bolt,(See Fig.0501)1
01***16Screw1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Pump
01***16Screw4
01***25Bolt,(With Corrosion Resistor)1
62***10Valve1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Oil Pump (High Altitude Spec.)
01***16Screw3
01***30Bolt,(Water Separator Spec.)2
62***10Valve1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Piston
04***12Ring, Snap12
62***02Piston Ring Ass'Y,Per Cylinder6
62***10Pin,Piston6
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Rear Hanger
01***20Bolt, Hose Clamps (Inlet And Return Line Hoses)2
62***60Hanger,Rear1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Rocker Arm
01***65Bolt,(For Alternator Bracket Mount)8
61***30Circlip2
62***20Spring5
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Safety Guard (For 25a Alternator)
Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Spare Parts
04***31V-Belt,(For Trimming Dozer)1
04***52V-Belt,(Sandy And Dusty Spec.)1
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Spare Parts (For 13a? 25a Alternator) (For Reversible Fan)
04***32V-Belt,(For Trimming Dozer)1
04***53V-Belt,(For Add. Air Compressor)1
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Spare Parts (For 13a? 25a Alternator) (Noise Suppression Spec.)
04***34V-Belt,(Tropical Sandy? Dusty Spec.)1
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
60***41Cartridge,Engine Oil Filter (D31s)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Spare Parts (For 15a Alternator)
07***16Gasket,(For Pc750-6) (See Fig.A2110)1
60***41Cartridge,Engine Oil Filter (D31s)1
60***40Cartridge,Fuel Filter1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Starting Motor (5.5kw) (Inner Parts)
60***50Starting Motor Ass'Y,(5.5kw)1
KD***30Bracket,Center1
KD***20Cneter Bracket A1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Starting Motor 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-B0a2)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Stop Motor
01***16Bolt3
01***20Bolt,(With Tachometer Outlet)1
01***20Screw1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Tension Pulley (For 13a Alternator)
01***12Bolt4
01***25Bolt,(With Corrosion Resistor)1
01***65Bolt,(With Water Separator)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Tension Pulley (For 25a Alternator)
01***65Bolt, Mount Tube To Divider Valve1
01***20Bolt,(For Japan Pc200)1
01***06Nut1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Turbocharger (High Altitude Spec.) (Inner Parts)
62***20Turbocharger Ass'Y1
GA***16Bolt6
GA***64Housing,Turbine1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Turbocharger Oil Piping (High Altitude Spec.)
01***16Screw5
01***20Screw4
01***06Nut1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump
01***16Screw5
01***20Screw2
01***75Bolt,(For Shipping)4
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump (For Reversible Fan)
01***16Screw5
01***20Screw2
01***75Bolt,(For Shipping)4
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Hardening Pulley) (For 13a Alternator)
04***32V-Belt,(For Trimming Dozer)1
04***53V-Belt,(For Add. Air Compressor)1
62***50Pulley? Hardening,(Tropical Sandy? Dusty Spec.)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 13a?25a Alternator)(Noise Suppression Spec.)
04***34V-Belt,(Tropical Sandy? Dusty Spec.)1
62***10V-Belt,Fan Drive1
62***80Pulley?Non Hardening,(Tropical Sandy? Dusty Spec.)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 15a Alternator) (For Reversible Fan)
04***53V-Belt,(For Add. Air Compressor)1
62***61Pulley?Non Hardening,(For Japan Pc200)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 25a Alternator)
04***32V-Belt,(For Trimming Dozer)1
04***53V-Belt,(For Add. Air Compressor)1
62***61Pulley?Non Hardening,(For Japan Pc200)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (For 25a Alternator) (For Reversible Fan)
04***32V-Belt,(For Trimming Dozer)1
04***53V-Belt,(For Add. Air Compressor)1
62***51Pulley?Non Hardening,(With Tension Pulley)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Pump Pulley (Non Hardening Pulley) (One-Groove Pulley) (For 15a Alternator)
62***80Pulley?Non Hardening1
62***10V-Belt,Fan Drive1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Separator (For 13a? 25a Alternator)
01***25Bolt,(With Corrosion Resistor)2
01***10Bolt2
07***60O-Ring,(For Pc750?800?1800) (A2610)1
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Komatsu : 6d95l-1ad(S/N 96999-Up) : Engine : Water Separator (For 15a Alternator)
01***25Bolt,(With Corrosion Resistor)2
01***10Bolt2
01***15Bolt,(With Water Separator)2
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6D95L-1AD(S/N 96999-UP) serial number reference

The engine serial number plate is typically located on the left side of the engine block or on a metal data plate affixed near the valve cover. The prefix is the engine model code (e.g., 6D95L-1AD), which identifies the engine family and configuration, while the subsequent digits are the unique serial number within that range.

PrefixIdentifies
6D95L-1ADEngine Model

Frequently asked questions

What is the engine model and displacement?

The engine is the Komatsu 6D95L-1AD (S/N 96999-UP), a 6-cylinder in-line diesel with a total piston displacement of 4,890 cm³ (298.4 cu in).

What is the operating weight of the machine?

Operating weight varies by configuration and attachment. For the Komatsu GD305-A-1A grader using this engine, the weight typically ranges from 15,000 to 20,000 lb (6,800 to 9,100 kg) depending on blade and ripper options.

What engine replaced the 6D95L-1AD?

The 6D95L-1AD was succeeded by electronically controlled engines such as the SAA6D95LE series to meet Tier 2 and later emissions standards, offering improved fuel efficiency and reduced emissions.

What 6D95L-1AD(S/N 96999-UP) owners discuss

What are the known powertrain and hydraulic behaviors associated with the Komatsu 6D95L-1AD engine series?
The 6D95L-1AD is a 5.0L (305 cu in) inline-6 turbocharged diesel engine producing approximately 81 kW (109 HP) at 2,000 RPM with torque estimated at 400–450 N·m (295–332 lbf·ft). It uses a mechanical injection system. The engine is paired with Komatsu’s hydraulic systems, which are known for smooth operation and fuel efficiency. A common diagnostic pattern is that if the hydraulic pump fails, the engine is often not far behind due to shared contamination or wear, a factor that negatively impacts resale value. The boost compensator acts via turbocharger air supply pressure to increase fuel injection at high speed/load, improving exhaust color and turbo performance during acceleration. If the fuel setting matches a non-turbo engine, low-speed fuel injection decreases, worsening exhaust color. The engine relies on a mechanical governor and fuel control lever rather than electronic engine management for basic operation, though modern variants may include electronic monitoring via KOMTRAX for parameter tracking.
What undercarriage or wear patterns are typical for machines powered by this engine series?
Machines equipped with the 6D95L-1AD (such as the GD305-A-1A grader with serial prefix 6734 and engine serial 96999-Up) are subject to standard heavy-duty undercarriage wear. Common issues include track tension loss, roller wear, and track-chain elongation, particularly in dusty or abrasive environments. The line is noted for wearing out complete machines simultaneously rather than individual components failing in isolation. Operators should monitor track tension regularly and check for mud or debris packed into the undercarriage, which can cause uneven wear or pulling to one side. Final drive noise, often described as grinding, may indicate travel motor or final drive issues requiring inspection of oil levels and contamination.
What are the specific quirks or maintenance requirements for the 6D95L-1AD engine per the series documentation?
The 6D95L-1AD engine block and oil pan are sealed with silicone rather than gaskets, as the parts catalog does not list gaskets for these interfaces. Over- or under-torquing during reassembly is a common cause of failure; exact torque specs for cylinder head bolts, crankshaft mains, connecting rods, and rocker arms must be followed. The engine requires Komatsu EO or equivalent diesel engine oil and Komatsu TO or equivalent hydraulic oil. Coolant capacity varies by configuration; verify with the specific machine’s operation and maintenance manual. The engine is sensitive to air entering the fuel supply and requires regular inspection of fuel filters and water separators. Intake and charge-air hoses must be checked for loose clamps or damage, as airflow restriction causes power loss under load. The boost compensator spring tension and adjustment screw must be set correctly to balance fuel injection and exhaust color.
What are the common electrical or sensor issues reported for this engine series?
While the 6D95L-1AD uses a mechanical injection system, machines equipped with it often rely on electronic control systems for monitoring and safety interlocks. Common electrical issues include intermittent starting, dashboard failures, and random shutdowns triggered by faulty sensors or unstable power supplies. Multiple fault codes may indicate battery issues, poor grounds, or connector problems. The KOMTRAX monitoring system can detect early engine parameter deviations, but sensor failures can trigger false warnings. Owners report that a single faulty sensor can cause multiple warning signals, leading to misdiagnosis. Always verify battery state of charge and load capacity before assuming starter or electrical component failure, as voltage collapse under load can mimic electrical faults.
What should be checked when buying a used machine with a 6D95L-1AD engine (S/N 96999-UP)?
When purchasing a used machine with a 6D95L-1AD engine (serial 96999-Up), verify the exact serial number matches the engine parts catalog for that range, as components vary by configuration. Check the engine block for signs of oil leaks at the silicone-sealed oil pan and front cover. Inspect the turbocharger and boost compensator for proper operation and exhaust color during acceleration. Test hydraulic functions cold and hot to identify internal leakage that worsens with temperature. Check undercarriage wear, track tension, and final drive noise. Verify the condition of fuel filters, water separator, and air intake system. Review KOMTRAX data if available for historical engine parameters. Confirm the machine’s emissions tier (Tier 1/Stage II for this serial range) and ensure all safety interlocks and sensors are functional. Be aware that hydraulic pump failure may indicate impending engine issues due to shared contamination paths.
What are the fluid specifications and capacities for the 6D95L-1AD engine and associated systems?
Engine oil: Komatsu EO or equivalent diesel engine oil. Hydraulic oil: Komatsu TO or equivalent hydraulic oil. Coolant: Komatsu Super Coolant AF-NAC or equivalent. Specific capacities vary by machine configuration (e.g., PC200LC-7, PC200LC-8, GD305-A-1A) and are not uniformly documented for the 6D95L-1AD engine alone. Consult the specific machine’s operation and maintenance manual for exact liters or gallons. The engine displacement is 5.0L (305 cu in). Bore and stroke are approximately 102 mm × 110 mm (4.02 in × 4.33 in). Weight is approximately 600–800 kg (1,323–1,764 lb).
What safety-critical fixes or inspections are required for the 6D95L-1AD engine?
Ensure all torque specs for cylinder head bolts, crankshaft mains, and connecting rods are met during any engine work to prevent catastrophic failure. Verify the boost compensator adjustment is correct to avoid excessive black smoke or poor performance. Check all electrical grounds and battery connections to prevent random shutdowns or starting issues. Inspect the cooling system for blockages between heat exchangers (radiator, hydraulic oil cooler, charge-air cooler) to prevent overheating. Ensure the fuel system is free of air and contaminants. Have your dealer verify the exact serial number compatibility for parts and the correct torque specifications for your specific machine configuration.

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

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