Komatsuengine(no series)

Komatsu 3D95S-W-1C(S/N 10467-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live 3D95S-W-1C(S/N 10467-UP) parts

The Komatsu 3D95S-W-1C is a compact three-cylinder, direct-injection diesel from Komatsu's 95-series engine family, displacing about 2.02 liters from a 95 x 95 mm bore and stroke and rated near 28.7-29 kW (38-39 hp) gross, naturally aspirated with a mechanical injection pump and no electronic engine controls. This exact parts-book build covers engine serial numbers 10467 and up, fitted to the Komatsu PC40-5 mini excavator (machine S/N 8501-UP and up). Later production of this compact excavator line moved on to the -1D (S/N 12209-UP, paired with the PC50UU-1) and -1E (S/N 13618-UP, paired with the PC40-6) revisions of the same base engine.

Across the 3D95S-W-1 family, the suffix letters mark sequential production running changes rather than full redesigns: this -1C build (SN 10467-up) sits between the earlier lettered builds and the later -1D (SN 12209-up) and -1E (SN 13618-up) revisions, with updates concentrated in the fuel system and minor casting details rather than displacement or power. The three-cylinder 3D95S-W line was eventually phased out as Komatsu's 95-series expanded into larger, turbocharged, and later electronically controlled four- and six-cylinder derivatives. In today's used and parts market, these engines still turn up in older rental-grade mini excavators kept running past their original service life; buyers sourcing pistons, injection-pump parts, or gasket sets need to confirm which serial-range suffix they actually have, since running changes are not always interchangeable across the breaks.

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 3D95S-W-1C(S/N 10467-UP) specifications

Engine

Model / production block	Komatsu 3D95S-W-1C, a running-change parts block (S/N 10467-UP) of the 3D95S-W-1 series. Fitted to the Komatsu PC40-5 mini excavator (chassis S/N 8501-UP and up). Later PC40-5 production carried the 3D95S-W-1D (S/N 12209-UP) and 3D95S-W-1E (S/N 13618-UP) blocks of the same base engine; core power and displacement are unchanged across these revision levels.
Configuration	3-cylinder, in-line, water-cooled, 4-stroke diesel. Naturally aspirated with a mechanically governed inline injection pump; no electronic engine controls.
Displacement	2.02-2.03 L
Bore x stroke	95 mm x 95 mm (3.74 in x 3.74 in)
Rated power	Approx. 28.7-29 kW (38.5-39 PS/hp) as installed in the PC40-5, at approx. 2,500-2,600 rpm. Figures vary slightly by listing.
Emissions tier	None. Predates off-highway emissions certification.

Weights

Bare engine weight	Not published for this engine block. Confirm dry/wet weight against the shop manual.
Host machine operating weight	PC40-5 mini excavator fitted with this engine: approx. 3.91 t (8,620 lb) operating weight.

Dimensions

Bore x stroke	95 mm x 95 mm (3.74 in x 3.74 in)
Engine overall dimensions	Not published for this engine block.
Host machine transport length	Approx. 5.34 m (17 ft 6 in), PC40-5 application
Host machine transport width	Approx. 1.84 m (6 ft 0 in), PC40-5 application
Host machine transport height	Approx. 1.38 m (4 ft 6 in), PC40-5 application
Track shoe width	400 mm (15.7 in), PC40-5 application

Performance

Torque peak	Maximum torque is reached near 2,500-2,600 rpm engine speed; exact torque figure not published for this variant.
Bucket tear-out force	Approx. 25.5 kN, PC40-5 application
Travel speed	Not documented for this specific engine/machine serial pairing. Verify with your dealer.

Service capacities (summary)

Engine oil (crankcase)	Not documented in independently verified sources for this exact engine and serial range. See the fluid & lubricant chart; confirm against the shop manual before service.
Cooling system	Not documented in independently verified sources for this exact engine and serial range. See the fluid & lubricant chart; confirm against the shop manual before service.
Fuel tank	Not documented specifically for the PC40-5 application of this engine; tank capacity is a chassis item that varies by host machine. Check the operator's manual.
Hydraulic system	Not documented specifically for the PC40-5 application of this engine; hydraulic tank capacity is a chassis item that varies by host machine. Check the operator's manual.

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

3D95S-W-1C(S/N 10467-UP) fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (oil pan, with oil filter)	Not documented in publicly available sources for this exact engine and serial range (S/N 10467-UP). This 95-series 3-cylinder engine had two different oil pans across its production run, which can also mean a capacity change at that break. Confirm the exact liters/US gal figure against the factory operation & maintenance manual or with a Komatsu dealer using the engine serial number.	Diesel engine oil, API classification CD/CE or later, graded by ambient temperature per Komatsu's standard chart for this engine family: lighter SAE 10W or 10W-30 in cold conditions, SAE 15W-40 in moderate-to-warm conditions, SAE 30 in consistently warm climates. Komatsu Genuine engine oil is the factory-branded choice; an equivalent CD/CE-rated diesel engine oil in the correct viscosity band is an accepted substitute.
Cooling system (radiator and block, coolant)	Not documented in publicly available sources for this exact engine and serial range. Full-system coolant volume is set by the host machine's radiator, not the engine alone, so it varies by which chassis the engine is installed in. Confirm against the applicable machine operation & maintenance manual.	Komatsu Genuine year-round antifreeze/coolant (ethylene-glycol base) mixed with clean water at the ratio specified for the expected minimum ambient temperature. A supplemental coolant additive/corrosion resistor is used on this engine family per Komatsu's standard cooling-system maintenance schedule; check concentration at each coolant service.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Komatsu 3D95S-W-1C(S/N 10467-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level on the dipstick before starting and top off as needed. Check coolant level in the radiator and reservoir; add coolant if low. Inspect the fan belt for tension, cracks, and fraying. Drain water and sediment from the fuel filter/water separator. Walk around the engine and check for fuel, oil, and coolant leaks. Check battery electrolyte level and clean corroded terminals.
Every 250 h	Change engine oil. Replace the engine oil filter cartridge. Check and adjust fan belt tension. Clean the fuel strainer and pre-filter element. Grease external linkage points on the throttle and injection pump controls.
Every 500 h	Replace the fuel filter cartridge. Load-test the battery and clean and tighten terminal connections. Inspect and clean the crankcase breather. Check engine mounting bolts for correct torque. Inspect the exhaust manifold and piping for leaks or cracks.
Every 1,000 h	Check and adjust valve clearance. Check and adjust fuel injection timing. Flush and clean the radiator externally. Test alternator output and inspect starter motor condition. Inspect the crankshaft pulley and vibration damper for wear. Check cylinder compression if power loss or hard starting is reported.
Every 2,000 h	Drain and replace engine coolant; flush the cooling system internally. Remove, test, and recalibrate the fuel injection nozzles. Send the fuel injection pump out for testing and recalibration. Check cylinder head bolt torque. Inspect the water pump for shaft play and seal leakage. Replace cracked or compressed engine mount isolators.
Every 4,000 h	Perform a top-end overhaul: valves, guides, and injector reconditioning. Resurface or replace the cylinder head if warped beyond spec. Replace the water pump and thermostat as a set. Inspect the injection pump drive gear and timing components for wear.
Every 6,000 h	Perform an in-frame overhaul: pistons, rings, and cylinder bores/liners. Check and recondition crankshaft main and rod bearing journals. Replace all engine mounts and flexible coolant and fuel hoses. Rebalance the three-cylinder crankshaft assembly if journals are reground.

Servicing the 3D95S-W-1C(S/N 10467-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

The 3D95S-W-1C runs mechanical fuel injection with no electronic fault codes, so trend data has to come from manual sampling. Pull an oil sample at every 250-hour change and watch for silica or iron, early signs of a leaking intake seal or worn cylinder bore on this direct-injection three-cylinder. Track coolant condition for corrosion-inhibitor depletion in the cast-iron block and head. Log exhaust smoke color and injector pop-pressure at each interval; a drifting injection pump shows up here long before it stalls the mini excavator it drives.

Corrective & Common Repairs

Hard cold-start complaints on this direct-injection three-cylinder usually trace to worn injector tips or a leaking delivery valve in the mechanical pump, not compression, since not every host configuration carries a glow-plug backup. Check the water pump shaft for play before assuming head-gasket failure; coolant loss and bearing whine both start there. Fan belt and alternator bracket wear are common on the compact accessory drive. Inspect the hydraulic pump drive coupling and engine mounts for fatigue cracking from repeated digging-cycle loading.

Overhaul & Rebuild Points

At rebuild, measure the 95 mm bores and wrist-pin bosses against wear limits before re-ringing; this three-cylinder has limited factory oversize, so bore condition decides whether a liner or block replacement is needed. Resurface the head only within spec; it has a shallow deck, and over-machining drops compression on the leaf-shaped piston bowl. Send the injection pump and nozzles out for calibration rather than reusing worn units. Recheck main and rod bearing clearances on the three-throw crankshaft before final torque, then run a controlled break-in.

Seasonal & Environment Servicing

Cold climates are hard on this mechanical injection pump: fuel waxing and slow cranking speed are the two failure points, so switch to winter-grade fuel and confirm the starting-aid system works before freezing weather. Since the engine carries no electronic thermostat control, check radiator shutter or cover fitment on the host mini excavator to hold operating temperature. In dusty or high-debris sites, inspect the crankcase breather and air intake seal more often, since this naturally aspirated engine has no turbocharger to flag induction restriction early.

3D95S-W-1C(S/N 10467-UP) common service parts

Part number	Part	Notes
09637-30661	Plate? Instruction,Air Cleaner (Single Element)	Air intake service	Check fitment →
09637-30762	Plate? Instruction,Air Cleaner (Single Element)	Air intake service	Check fitment →
07000-02135	O-Ring,Hydraulic Oil Filter	Hydraulic service	Check fitment →
600-211-6570	Plate? Caution,Oil Filter And Bypass Filter	Lubrication service	Check fitment →
600-211-6630	Plate? Caution,Oil Filter And Bypass Filter	Lubrication service	Check fitment →

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

3D95S-W-1C(S/N 10467-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Coolant Temperature Pilot Lamp (red, thermometer symbol)	Engine coolant temperature has exceeded the safe operating range	Low coolant level, clogged radiator fins, slipping or broken fan belt, stuck thermostat	Idle engine at low speed, let it cool, then check coolant level and radiator for debris before restarting
Engine Oil Pressure Pilot Lamp (red, oil-can symbol)	Engine oil pressure has dropped below the minimum allowed level	Low oil level, clogged oil filter, worn oil pump, wrong oil viscosity	Stop engine immediately, check oil level and filter condition before restarting
Charge (Battery) Pilot Lamp (red, battery symbol)	Alternator is not charging the battery	Loose or broken fan/alternator belt, faulty alternator, loose wiring connection	Check belt tension and alternator wiring; test alternator output if belt is intact
Air Cleaner Restriction Indicator	Intake airflow is restricted	Clogged air filter element	Inspect and clean or replace the air filter element
Fuel Level Gauge / Low Fuel Warning	Fuel tank level is near empty	Low fuel, or air entering the mechanical fuel system after running dry	Refuel; bleed the fuel injection pump and lines if the engine lost prime
Intake Air Heater (Preheat) Indicator	Cold-start intake air heater is energized/timing out, not a fault condition	Normal cold-start aid cycle	Wait for the lamp to go out before cranking in cold weather

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

3D95S-W-1C(S/N 10467-UP) attachments & work tools

Digging buckets

General-purpose digging buckets for this excavator class run roughly 300-900 mm (12-36 in) wide, with capacity from about 0.07 to 0.21 m3 (0.09-0.28 cu yd). Ears are sized for 45 mm pins on about 230 mm (9.06 in) centers.

Ditching/grading buckets

Wider ditching buckets extend to about 1050-1500 mm (42-60 in), holding roughly 0.27-0.37 m3 (0.35-0.48 cu yd) for grading and cleanup work. Mounting matches the standard 45 mm pin digging-bucket ears.

Micro-trenching bucket

A narrow trenching bucket around 150 mm (6 in) wide is offered in this class for utility and cable-laying work. It uses the same pin-on mount as the standard digging buckets.

Hydraulic breakers

Breaker packages sized for the 2.5-4.5 t class run about 25-50 L/min at 90-120 bar, delivering roughly 320 J impact energy at a blow rate around 600 to 1,100 blows per minute; complete units weigh around 150 kg. Running one requires an auxiliary one-way hydraulic circuit with a foot-pedal control valve piped into the machine.

Hydraulic thumbs

Bolt-on hydraulic thumbs are offered sized to match bucket width, pivoting off the bucket linkage pin for grading and material handling. They run off a dedicated auxiliary hydraulic circuit, separate from the breaker/one-way line.

Earth augers

Hydraulic auger drives are offered for post-hole and footing work in this weight class, powered by a two-way auxiliary hydraulic circuit and a dedicated auger motor/gearbox. Bit sizes vary by supplier and are matched to the auger drive, not the base machine.

Quick couplers

Both mechanical pin-grabber/wedge couplers and hydraulic quick-attach couplers are offered, sized to the standard 45 mm bucket pin. Hydraulic couplers need auxiliary plumbing run to the coupler cylinder for tool-less swaps; mechanical couplers need no extra hydraulics.

Root rakes/grapples

Multi-tine root rake attachments around 1000-1200 mm (40-48 in) wide are offered for clearing, grubbing, and debris handling. They mount on the standard bucket pins and need no auxiliary hydraulics.

Compaction attachments

Hydraulic compaction plates are offered for backfill and trench compaction on machines in this class, driven by a two-way auxiliary hydraulic circuit for the vibratory mechanism.

Factory configuration notes

Factory option literature for this vintage compact excavator is thin; most attachment sizing and hydraulic-kit detail available today comes from aftermarket attachment suppliers rather than an original Komatsu options sheet. Confirm the machine's actual auxiliary-circuit provision (one-way vs two-way, foot pedal) with your dealer before ordering breaker, thumb, auger, or compactor tooling.

All 3D95S-W-1C(S/N 10467-UP) assemblies by section

Every catalogued assembly group for the Komatsu 3D95S-W-1C(S/N 10467-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Cooling System

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cooling System : Water Pump And Cooling Fan

01***16	Screw	5
01***20	Screw	2
01***35	Screw	4
01***40	Screw	3

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Cylinder Block

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Camshaft And Tappet

01***20	Screw	2
04***16	Fitting Wedge	1
62***00	Camshaft Ass'Y	1
62***10	Tappet	6

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Crankshaft

61***20	Bolt	1
62***00	Crankshaft Ass'Y	1
62***10	Pulley?Non Hardening,Crank	1
62***00	Main Metal Ass'Y	4

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Cylinder Block

04***20	Pin,Dowel (Welded)	2
04***28	Pin, Dowel - Transmission Case, Pin-Dowel	2
04***08	Adapter Sleeves	6
07***12	Plug,(Without Corrosion Resistor)	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Flywheel And Flywheel Housing

01***40	Bolt	6
01***35	Bolt	1
01***40	Bolt,Reamer	6
01***16	Bolt, Mount Solenoid Valve	2

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Front Cover And Gear

01***70	Bolt,(For 75a Alternator)	1
01***16	Bolt	2
01***20	Bolt,(With Tachometer Outlet)	6
01***16	Screw	2

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Oil Pan(#10467-16480)

01***16	Bolt, Mount Solenoid Valve	24
01***16	Screw	24
07***16	Gasket,(For Pc750-6) (See Fig.A2110)	1
62***10	Pan,Oil	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Oil Pan(#16481-)

01***16	Bolt, Mount Solenoid Valve	24
07***16	Gasket,(For Pc750-6) (See Fig.A2110)	1
62***11	Pan,Oil	1
62***51	Plate	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Block : Piston And Connecting Rod

04***12	Ring, Snap	6
62***11	Piston (L)	3
62***21	Piston (S)	3
62***11	Piston (L)	3

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Cylinder Head

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Air Cleaner

09***61	Plate? Instruction,Air Cleaner (Single Element)	1
09***62	Plate? Instruction,Air Cleaner (Single Element)	1
09***61	Plate? Instruction,(Italian-English)	1
09***61	Plate? Instruction,Spanish-English (Air Cleaner)	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Air Intake Manifold And Connection

01***50	Bolt,(With Corrosion Resistor)	4
01***60	Screw	2
09***50	Liquid Gasket, Lg-7, 150g	0
62***20	Gasket,Air Connector	2

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Air Intake Manifold And Connection (With Dust Indicator Outlet)

01***50	Bolt,(With Corrosion Resistor)	4
01***60	Screw	2
02***04	Plug,(Not Shown)	1
08***35	Indicator,Dust (German-English)	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Cylinder Head

01***16	Bolt, Mount Solenoid Valve	4
01***32	Washer,(Not Used With Emergency Str.)	13
02***04	Plug, Pipe	1
07***08	Plug, Expansion	3

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Cylinder Head Cover

61***20	Screw	2
61***30	Washer,(B)	2
61***42	Packing,Cylinder Head Cover	2
62***10	Cover,Head	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Exhaust Manifold

01***25	Stud	3
01***25	Bolt - Relay Mounting	6
62***10	Manifold,Exhaust	1
62***10	Gasket,Exhaust Manifold	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Muffler

01***25	Bolt,(Sandy? Dusty Terrain Spec.)	4
01***06	Nut	4
01***16	Washer,(For Shipping Parts)	4
01***23	Washer, Wiring Harness Mounting Bracket	3

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Cylinder Head : Rocker Arm

01***12	Bolt,(Without R.P.C.U.)	1
01***65	Bolt,(For Alternator Bracket Mount)	4
61***30	Nut	6
61***20	Spring,Conical	2

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Electrical System

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Electrical System : Alternator (35a)

60***40	Alternator A. (35a),(35a)	1
ND***01	Bushing,Insulate	1
ND***00	Pulley	1
ND***90	Bushing,Insulate	2

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Electrical System : Alternator And Mounting

01***30	Bolt,(Water Separator Spec.)	1
01***25	Bolt,(With Corrosion Resistor)	1
01***45	Bolt	1
01***60	Screw	2

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Electrical System : Heater Signal? Relay? Timer

60***90	Signal,Heater	1
60***20	Timer,Safety	1
60***30	Relay	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Electrical System : Starting Motor

60***50	Starting Motor A.,(2.0kw)	1
ND***20	Starter Kit	1
ND***60	Bearing,Ball	1
ND***80	Spring	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Electrical System : Starting Motor And Mounting

01***25	Stud	1
01***35	Screw	1
01***10	Nut,(Dust?Drip Proof? Trimming S.)	2
(6***0)	Starting Motor A.,(2.0kw) (See Fig.0661)	1

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Engine Kit

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Engine Kit : Gasket Kit

Fuel System

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Feed Pump

YM***00	Feed Pump Ass'Y	1
YM***50	Gasket,(Square Type)	1
YM***20	O-Ring,(Round Type)	1
(6***0)	Injection Pump Ass'Y,(See Fig.0451)	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Fuel Filter And Piping

07***12	Gasket,Injection Pump Piping	2
07***67	Clamp, Hose	4
07***03	Hose	1
08***10	Band,Fuel Hose	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Fuel Injection Pump

62***20	Injection Pump Ass'Y	1
YM***60	O-Ring,Fuel Injection Pump	1
YM***70	Retainer, Spring	3
YM***50	Kit, Shim	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Fuel Injection Pump And Piping

01***25	Stud	3
01***06	Nut	3
01***12	Washer,Lock (Noise Suppression Spec.) (K2)	1
04***33	Pin,Spring	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Governor

YM***30	Label, Fuel Pump; Was Ym171353-51930, Label,Fuel Pump	1
YM***10	Pin,Stop Lever	1
YM***90	Shaft,Governor Lever	1
YM***30	Spacer,Lever Shaft	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Nozzle Holder

07***10	Tube,(See Fig.0421-14)	2
07***18	Tube,Spill	1
60***50	Plug,Glow	3
62***00	Nozzle Holder Ass'Y	3

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Fuel System : Water Separator

07***60	O-Ring,(For Pc750?800?1800) (A2610)	1
60***00	Water Separator A.,(See Fig.2415)	1
60***10	Cover	1
60***20	Case	1

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Lubricating Oil System

Komatsu : 3d95s-W-1c(S/N 10467-Up) : Lubricating Oil System : Lubricating Oil Filter

20***51	Plate? Instruction,(English) (For Melroe)	1
60***30	Cartridge	1
60***20	Plate? Caution,(Italian-English)	1
60***70	Plate? Caution,Oil Filter And Bypass Filter	1

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Komatsu : 3d95s-W-1c(S/N 10467-Up) : Lubricating Oil System : Lubricating Oil Pump And Suction Pipe

01***12	Bolt,(See Fig.0501)	1
01***16	Screw	6
61***30	O-Ring,Suction Tube	1
62***10	Tube,Suction	1

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3D95S-W-1C(S/N 10467-UP) serial number reference

The engine data plate sits on the left side of the block, on or near the valve/rocker cover, and lists the manufacturer, engine model, and serial number; if the tag is missing or unreadable, the serial is also stamped directly into the block. For this engine there is no letter PIN prefix to decode - read the plain serial number and compare it against the documented spec break (10467 and up for 1C, up to 12208 before the 1D spec begins) to confirm the build.

Prefix	Identifies	Notes
10467-UP	3D95S-W-1C	Start of the 1C spec block in the 3D95S-W-1 series, fitted to the Komatsu PC40-5 mini excavator (machine S/N 8501-UP). Komatsu tracks this engine range by a straight numeric serial number, not a 3-character alpha PIN prefix. Serials 10467 through 12208 fall under the 1C spec; 12209 and up move to the 1D spec (paired with the PC50UU-1), a different build and out of scope here.

Frequently asked questions

What engine does the 3D95S-W-1C use?

The 3D95S-W-1C designation is the engine itself: a Komatsu 95-series, three-cylinder, direct-injection diesel with liquid cooling and natural aspiration. It has a 95 x 95 mm bore and stroke for about 2.02 liters of displacement and a gross rating in the high-20 kW range (roughly 38-39 hp), depending on the host machine's governed speed. This build covers engine serial numbers 10467 and up.

What is the operating weight?

The engine itself is not weight-classed the way a full machine is. Its confirmed host, the Komatsu PC40-5 mini excavator, has an operating weight of approximately 3.9 t (8,620 lb). Later running changes of this base engine power other compact excavators in a similar weight class; confirm the exact host machine and weight against your unit's serial number.

What replaced the 3D95S-W-1C?

Within its own family, the -1C build was superseded by the -1D (serial 12209-up) and later -1E (serial 13618-up) revisions, both running changes to the same base 3D95S-W-1 engine rather than a new design. As Komatsu's compact equipment line moved on, the 95-series platform continued in larger turbocharged and eventually electronically controlled four- and six-cylinder derivatives; verify the exact cross-reference with your dealer for a specific host machine.

What 3D95S-W-1C(S/N 10467-UP) owners discuss

What do owners say about hydraulic performance on the mini excavator this engine powers, especially once it has been running a while?

This engine drives a straight, non-pilot hydraulic system on its host mini excavator, controlled directly through mechanical spool valves rather than a pilot-operated circuit. Owners report weak boom, arm, or swing response that gets worse as the hydraulic oil warms up, sometimes to the point a function barely moves. The root cause is rarely the relief valve itself. Clogged screens in the pilot-line fittings and a dirty suction strainer or filter inside the pump are the more common finds. Full pressure across all pump stages typically returns once the strainer, filter, and pump are cleaned and correctly reassembled.

What undercarriage wear patterns show up on this class of rubber-tracked mini excavator?

Rubber tracks on this platform crack and wear out faster than a steel-shoe undercarriage, especially once the rubber has aged and hardened. Track rollers are reported to seize or lose their grease charge over time, which throws off track tension unevenly side to side. Front idler service life runs roughly 1,000 to 3,000 hours depending on ground conditions and maintenance, so it varies by use case. Before fitting new tracks, check sprocket wear, idler tension, and roller condition, since worn components will chew through a fresh set of tracks quickly. Replace tracks in matched pairs to keep tracking even.

Are there engine quirks specific to this 3-cylinder 95-series diesel that owners flag?

This is a 3-cylinder, water-cooled, naturally aspirated diesel of roughly 2.0 L displacement, in the 29 kW (about 38-39 hp) class, with bore and stroke both near 95 mm (about 3.7 in), matching the small Komatsu wheel/track excavators of this era. Owners of rebuilt units describe a stubborn pattern: the engine runs on the hot side and consumes coolant, with heavy white-to-gray exhaust smoke, even after a full rebuild with new injectors and injection pump. That points to head gasket sealing and injector pump timing/calibration as areas to scrutinize on any rebuild of this engine family, not just rings and bearings. Cold starting relies on the glow plug preheat cycle, a design shared across this engine's close production revisions; a full 20 to 30 second preheat before cranking is the typical owner habit, and a no-restart after preheat usually traces back to a weak or dead glow plug rather than the injection pump.

What electrical or sensor issues come up most often on this machine?

The cab monitor/control panel is a recurring complaint: fuel gauge, hour meter, warning lights, and travel-speed selection can all drop out together. Before assuming the panel itself has failed, check fuses and use a meter to confirm the wiring harness is actually delivering signal to the panel connector. A loose or corroded harness connection is a common culprit and cheaper to fix than a replacement panel. Separately, a no-crank, no-power complaint on one reconditioned unit traced back to the main power relay in the battery compartment and a battery that would not hold charge, rather than a wiring fault in the panel circuit itself.

What causes a 'starts then dies' complaint on this engine?

The fuel shutoff (stop) solenoid is the first place owners look. It has to seat fully closed with voltage applied; if it is out of adjustment, or the internal bushing has gummed up, the engine starts and then dies once the solenoid drops out of position. Confirm voltage is actually reaching the solenoid before condemning it, since no voltage at the connector points back to wiring or the ignition switch circuit instead. Because this solenoid is part of the engine-stop path, have your dealer verify the fix if you are not fully confident in the diagnosis. A solenoid that cannot reliably shut the engine down is a safety issue, not just a starting nuisance.

What final drive issues should owners watch for?

Seal leaks at the final drive cover plate are a known complaint, and on machines that have sat outside, corrosion can seize the cover to the housing tight enough that prying will not budge it. A slide hammer worked through the drain hole is the fix owners report succeeding where prying failed. A final drive that goes weak or stops working on one side only is usually a motor or internal gear problem rather than something fixable with an oil top-off; owners have sourced complete replacement final drive assemblies for roughly two thousand dollars per side. Because final drive work involves pressurized hydraulic motors and track-load-bearing components, have your dealer verify torque specs and seal seating before returning the machine to work.

What should a buyer check before purchasing a used example of this engine's host mini excavator?

Cycle every hydraulic function (boom, arm, bucket, swing, blade, travel) through a full warm-up and watch for functions that weaken or stall as the oil heats up, a common and sometimes costly-to-diagnose fault on this platform. Check both final drives for seal leaks at the cover plate and confirm each side pulls evenly; a weak side often means a motor or gear failure, not just low oil. Watch coolant level and exhaust smoke color at operating temperature; heavy white or gray smoke with coolant loss points to head gasket or injection pump trouble even on a machine advertised as recently rebuilt. Test the full instrument panel (fuel gauge, hour meter, lights, travel-speed selector) and run a normal glow-plug-then-crank start cycle without a stall. Inspect track rollers and idlers for grease retention and even tension, and check the rubber tracks for age-cracking. Weigh the shorter reach and tighter cab room typical of this excavator class against your work needs, since that trade-off versus later, larger mini excavators comes up often among owners.

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

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