Komatsuengine(no series)

Komatsu SAA6D170E-3A(S/N 310005-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live SAA6D170E-3A(S/N 310005-UP) parts

The Komatsu SAA6D170E-3A engine (S/N 310005-UP) is a 6-cylinder, turbocharged, after-cooled diesel powerplant designed for heavy-duty earthmoving applications. It powers the PC1250-7 series crawler excavators, WA600-3/WA700-3 wheel loaders, and HD465-7 rigid dump trucks. These machines operate in the 55 to 80 metric ton class, with operating weights ranging from approximately 55,000 kg to 80,000 kg depending on configuration. Production for this engine generation spans the mid-2000s to early 2010s, serving as the successor to the SAA6D170E-2 series and preceding the SAA6D170E-5 and E-7 generations. Configurations vary by machine type, including standard, LK, and SP variants for excavators and loaders.

Across the SAA6D170E series generations, Komatsu refined emissions compliance, moving from Tier 2/Stage II to Tier 4 Final/Stage V standards, which introduced complex aftertreatment systems like KDPF and SCR. The SAA6D170E-3A remains critical in the used and parts market because it bridges the gap between older, simpler mechanical engines and modern electronic controls. Its widespread use in high-hour PC1250 and WA600 fleets ensures a robust supply of rebuilt cores and aftermarket components, making it a cost-effective powertrain solution for fleet managers managing aging heavy equipment.

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 SAA6D170E-3A(S/N 310005-UP) specifications

Engine

Model	SAA6D170E-3A (Build 15G)
Gross Power	568 kW (762 hp) @ 2000 RPM
Net Power	394 kW (528 hp) @ 1800 RPM
Displacement	1413 in³ (23.15 L)
Cylinders	6
Emissions Tier	Tier 2

Weights

Operating Weight	97100 kg (the OEM part reference lb)
Operating Weight	55400 - 57501 kg (the OEM part reference - the OEM part reference lb)
Operating Weight	74090 kg (the OEM part reference lb)

Dimensions

Bore	6.69 in (170 mm)
Stroke	6.69 in (170 mm)

Performance

Bucket Capacity	9.2 m³ (12.04 cu yd)
Bucket Capacity	6.4 - 7.8 m³ (8.37 - 10.20 cu yd)
Bucket Capacity	18.5 - 22.0 m³ (24.20 - 28.77 cu yd)

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

Komatsu SAA6D170E-3A(S/N 310005-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and condition. Check hydraulic fluid level at sight glass. Check coolant level and ensure cap is secure. Drain water from fuel separator. Check DEF level. Check air filter restriction indicator.
Every 250 h	Change engine oil and filter. Inspect air cleaner outer element. Inspect belts and hoses for wear. Inspect hydraulic hoses for cracks or leaks. Check track tension and shoe/pad condition. Clean debris from radiator and oil cooler fins.
Every 500 h	Replace fuel filter. Replace hydraulic return filter. Test battery and alternator load. Test coolant SCA concentration. Collect KOWA oil sample. Perform visual undercarriage inspection.
Every 1,000 h	Replace air cleaner outer element. Change final drive oil. Inspect turbocharger condition. Measure undercarriage wear. Check swing machinery oil level. 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 structural inspection. Check transmission/torque converter oil. Inspect exhaust system for wear.

Servicing the SAA6D170E-3A(S/N 310005-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA fluid analysis at every 500-hour interval to monitor wear metals and contamination. For the SAA6D170E-3A, track iron and copper levels in engine oil to detect piston ring or bearing wear early. Monitor hydraulic fluid for ISO cleanliness and water content to protect the PC1250-7 and WA600-3 pump assemblies. Coolant analysis must verify SCA concentration and pH levels to prevent cavitation erosion in the cylinder liners. KOMTRAX telematics data should correlate with fluid trends to identify load spikes that accelerate oil oxidation.

Corrective & Common Repairs

Address frequent SAA6D170E-3A issues by inspecting the oil cooler core for cross-contamination between engine oil and coolant. Check the turbocharger shaft play and housing for carbon buildup, common in high-hour HD465-7 applications. Inspect the fuel injection nozzles for coking if power loss occurs. For undercarriage repairs on PC1250-7 excavators, measure sprocket tooth wear and track link elongation to prevent premature derailment. Replace hydraulic return filters promptly to avoid valve spool contamination in the swing and travel circuits.

Overhaul & Rebuild Points

Plan inframe overhauls for the SAA6D170E-3A around 15,000 to 20,000 hours, depending on maintenance history. Key rebuild points include replacing piston rings, cylinder liners, and main bearings. Inspect the crankshaft for journal wear and the camshaft for lobe degradation. For the WA600-3 and WA700-3 wheel loaders, check the torque converter and transmission gears for fatigue during chassis rebuilds. Verify the integrity of the engine block and mounting bolts to ensure proper alignment after major component replacement.

Seasonal & Environment Servicing

In cold climates, ensure the coolant mixture meets the required freeze protection rating for the SAA6D170E-3A’s liquid cooling system. Use low-viscosity Komatsu EO engine oil to aid cold starts. In dusty environments, increase the frequency of air filter inspections and clean the radiator fins daily to prevent overheating. For high-humidity or marine applications, inspect electrical connectors and the ECM for corrosion. Drain the fuel water separator more frequently to prevent microbial growth and injector damage in the PC1250-7 and HD465-7 fuel systems.

SAA6D170E-3A(S/N 310005-UP) common service parts

Part number	Part	Notes
07281-00197	Clamp,(With Pre-Fuel Filter)	Fuel system service	Check fitment →
6217-71-6470	Plate? Caution,Fuel Filter	Fuel system service	Check fitment →
600-185-6100	Element Assembly, Air Cleaner	Air intake service	Check fitment →
600-211-1231	Cartridge, Oil Filter	Lubrication service	Check fitment →
6560-41-7110	Filter	Scheduled service item	Check fitment →

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SAA6D170E-3A(S/N 310005-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CA115	Engine crankshaft speed sensor failure	Broken sensor, wiring issue, or connector corrosion	Replace the speed sensor and verify voltage at the pin connector
CA441	Battery voltage too low	Weak battery or charging system failure	Replace the battery or alternator and check the voltage regulator
CA442	Battery voltage too high	Faulty voltage regulator or alternator	Replace the alternator or battery and check the voltage regulator
CA451	Common rail pressure sensor feedback value too high	Malfunction in the rail sensor or actual overpressure condition	Diagnose the fuel rail pressure sensor or pump lines
CA452	Common rail pressure sensor feedback value too low	Sensor malfunction or fuel supply issue	Diagnose the fuel rail pressure sensor or pump lines
CA234	Engine overspeed	Throttle calibration error, engine load cycle issue, or operator misuse	Verify throttle calibration and engine load cycle
CA111	Internal engine controller fault	ECM internal failure	Replace or reprogram the ECM
CA122	Intake air pressure sensor high voltage	Sensor malfunction or wiring issue	Verify the intake pressure sensor and wiring
CA123	Intake air pressure sensor low voltage	Sensor short or airflow restriction	Check for a sensor short or an airflow restriction
CA2311	IMV solenoid valve failure	Faulty IMV solenoid or wire harness issue	Replace the IMV solenoid or inspect the wire harness

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

SAA6D170E-3A(S/N 310005-UP) attachments & work tools

Excavator Attachments

The SAA6D170E-3A engine with serial number 310005-UP is fitted to the PC1250-7, PC1250LC-7, and PC1250SP-7 crawler excavators. These machines utilize standard Komatsu quick coupler systems for bucket and tool interchangeability. Factory configurations include heavy-duty rock buckets and general purpose digging buckets sized for the 125-ton class.

Wheel Loader Attachments

This engine serial range corresponds to the WA600-3C, WA600-3D, and WA600-3LK wheel loader series. Typical work tools include general purpose buckets with capacities ranging from 6.4 to 7.8 cubic meters. The WA600 series also supports specialized attachments such as log grapples and multi-purpose handlers via the hydraulic circuit.

Bulldozer Attachments

The SAA6D170E-3A engine is used in the D375A-5 bulldozer series. Standard configurations include semi-U and universal dozer blades with capacities between 18.5 and 22.0 cubic meters. Ripper configurations vary by series, typically offering single-shank or multi-shank rock rippers for site preparation.

Dump Truck Attachments

The engine serial range 310005-UP applies to the HD465-7 and HD605-7 rigid frame dump trucks. These vehicles are equipped with standard rear-dump bodies designed for quarry and mining applications. No external work tools are attached; the body capacity is fixed to the chassis configuration.

Hydraulic & Coupling Systems

Komatsu excavators and wheel loaders in this class use proprietary quick coupler mechanisms compatible with standard ISO mounting patterns. Hydraulic kits for auxiliary tools require connection to the main control valve block. Factory guarding options include high-wear plates on bucket edges and side cutters for abrasive material handling.

All SAA6D170E-3A(S/N 310005-UP) assemblies by section

Every catalogued assembly group for the Komatsu SAA6D170E-3A(S/N 310005-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine

Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Air Cleaner Mounting

01***35	Bolt, Mount Ground Driven Steering Pump	9
01***40	Bolt,For Weight Adjusting Bolt	10
01***75	Bolt - Tube Mounting	1
01***80	Bolt,For Weight Adjusting Bolt	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Air Compressor Cover

01***20	Bolt,(For Mono Lever Steering)	6
62***60	Plate	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Air Intake Manifold

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***30	Bolt,(With Body Positioner)	1
01***45	Bolt, Mounting Cranking Motor	4
01***30	Bolt - Lower Oil Cooler Outlet Tubemounting	17

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Air Vent

01***16	Bolt - Starting Motor Ground Cable	1
01***16	Washer,Radio Controlled Slag Handling	1
07***15	Gasket,(Hd325?Pc750?800?1800) (A5010)	12
07***10	Screw, Banjo Connector (M10-1.25x20)	6

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Alternator (75a) (Inner Parts)

60***30	Alternator Assembly - 75 Amp	1
SD***X0	Coil Assembly	1
SD***X0	Washer	1
SD***X0	Bracket, Rear	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Alternator Drive

01***25	Bolt,(For Canvas Canopy?Head Guard)	8
62***80	Pulley, Non-Hardening	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Alternator Mounting (75a)

01***20	Bolt,(For Mono Lever Steering)	2
01***25	Bolt,(For Canvas Canopy?Head Guard)	3
01***30	Bolt,(With Body Positioner)	1
01***45	Bolt,(With Water Separator Type)	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Camfollower Cover

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***45	Bolt,(With Water Separator Type)	1
01***20	Bolt, Hose Clamps (Inlet And Return Line Hoses)	1
01***30	Bolt - Lower Oil Cooler Outlet Tubemounting	12

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Camshaft

01***25	Bolt,(Without Rops Guard? Canopy)	2
04***28	Key, Plain Woodruff	1
04***12	Ring, Snap (4)	2
61***30	Ring, Dowel	12

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cooling Fan

01***40	Bolt,For Weight Adjusting Bolt	6
01***32	Washer,(Not Used With Emergency Str.)	6
60***20	Fan,(Tropical Spec.)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Corrosion Resistor

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***45	Bolt, Mounting Cranking Motor	1
01***30	Bolt,(Water Separator Spec.)	4
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Crank Pulley

61***20	Washer	6
61***31	Bolt	6
62***52	Pulley, Non-Hardening	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Crank Pulley (For Eu Exhaust Gas Regulation)(#310096-)

61***20	Washer	6
61***31	Bolt	6
62***60	Pulley,Hardening	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Crankshaft(#310005-310020)

04***28	Key, Plain Woodruff	1
04***24	Pin,Dowel (For No.3 Housing)	1
61***50	Thrust Bearing Assembly	1
61***50	Thrust Bearing Assembly, Oversize 1.00mm	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Crankshaft(#310021-)

04***28	Key, Plain Woodruff	1
04***24	Pin,Dowel (For No.3 Housing)	1
61***50	Thrust Bearing Assembly	1
61***50	Thrust Bearing Assembly, Oversize 1.00mm	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cylinder Block

01***16	Bolt, Mount Solenoid Valve	12
01***60	Washer,(Without Rops Guard? Canopy)	14
04***14	Pin, Dowel	2
04***20	Pin,Dowel (Welded)	12

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cylinder Block Blind Cover

01***20	Bolt, Wiring Harness Mounting Bracket	6
01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***30	Bolt,(With Body Positioner)	3
01***25	Bolt,(Without Rops Guard? Canopy)	6

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cylinder Block Gasket Kit

07***25	O-Ring,Corrosion Resistor	1
07***95	O-Ring,Transmission Strainer	1
07***35	O-Ring,(F4320-68a0 -11 )	1
07***42	O-Ring - Torque Converter Totransmission	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cylinder Head

01***70	Bolt	12
04***20	Pin,Dowel (Welded)	2
07***38	0-Ring - Torque Converter Totransmission	2
07***08	Plug,(Without Auto Priming System)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Cylinder Head Gasket Kit

07***12	O-Ring,(F4350-59a1 -17 )	6
07***38	0-Ring - Torque Converter Totransmission	12
07***39	O-Ring,(Fig.A5010)	2
07***23	O-Ring,(For 2nd Travel Speed) (Op)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Damper

01***25	Bolt	12
04***24	Pin,Dowel (For No.3 Housing)	1
62***00	Damper Assembly, Vibration	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Damper (For Eu Exhaust Gas Regulation)(#310096-)

01***25	Bolt	12
01***16	Washer,Radio Controlled Slag Handling	12
04***24	Pin,Dowel (For No.3 Housing)	1
62***00	Damper Ass'Y	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Engine Mounting

01***45	Bolt, Mounting Cranking Motor	2
01***05	Capscrew	11
01***50	Bolt	8
01***32	Washer,(Not Used With Emergency Str.)	13

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Engine Mounting (For Eu Exhaust Gas Regulation)(#310096-)

01***45	Bolt, Mounting Cranking Motor	2
01***05	Capscrew	11
01***50	Bolt	8
01***32	Washer,(Not Used With Emergency Str.)	13

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Exhaust Manifold

01***90	Bolt	24
61***90	Spacer	24
61***71	Plug	1
62***20	Screw	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fan Belt(#310005-310024)

04***75

V-Belt Set,Reversible

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fan Belt(#310025-)

04***72

V-Belt, Set

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fan Drive

01***50	Bolt,For Weight Adjusting Bolt	6
01***25	Capscrew	1
01***32	Washer,(With Auto Emergency Steering)	1
01***32	Washer,(Not Used With Emergency Str.)	6

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fan Pulley(#310005-310024)

01***45	Bolt, Mounting Cranking Motor	6
01***32	Washer,(Not Used With Emergency Str.)	6
62***50	Pulley,Hardening	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fan Pulley(#310025-)

01***45	Bolt, Mounting Cranking Motor	6
01***32	Washer,(Not Used With Emergency Str.)	6
62***60	Pulley	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Flywheel

61***40	Washer	10
62***10	Flywheel Assembly	1
62***50	Bolt	10
66***21	Gear, Ring	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Flywheel Housing

01***30	Bolt,(With Body Positioner)	3
01***25	Bolt	5
01***85	Bolt	2
01***10	Bolt	9

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Front Cover

61***20	Seal,(Fig.A2040)	1
62***70	Seal? Front,(Fig.A2040)	1
62***20	Cover	1
62***21	Cover	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Front Cover Mounting

01***65	Bolt,(Used With Pin Puller)	1
01***75	Bolt - Tube Mounting	5
09***50	Liquid Gasket, Lg-7, 150g	0
61***40	Indicator	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Control Valve (Inner Parts)(#310005-310163)

62***20	Seal, O-Ring	2
62***20	Seal, O-Ring	1
62***40	Sensor, Coolant Temperature Assembly	1
62***40	O-Ring	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Control Valve (Inner Parts)(#310164-)

62***20	Seal, O-Ring	2
62***20	Seal, O-Ring	1
62***40	Sensor, Coolant Temperature Assembly	1
62***40	O-Ring	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Control Valve(#310005-310163)

01***85	Bolt, Divider Valve Mounting	2
01***05	Capscrew	2
01***10	Bolt,(With Joy Stick Steering)	2
01***10	Washer,(For 35a Alternator)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Control Valve(#310164-)

01***85	Bolt, Divider Valve Mounting	2
01***10	Bolt,(With Joy Stick Steering)	2
01***55	Bolt, Mount Dryer To Bracket And Frame	1
01***10	Washer,(For 35a Alternator)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Filter Mounting

01***00	Bolt,For Weight Adjusting Bolt	3
01***55	Bolt, Mount Dryer To Bracket And Frame	1
01***90	Bolt,(For Large Fan)	1
01***08	Nut,See Fig. K4010-04a0	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injection Pump (Inner Parts)(#310047-)

62***20	Plug, Threaded (M22-1.50)	1
62***60	Seal, O-Ring	1
62***50	Plug, Threaded (7/8-14 Unf)	1
62***20	Plug, Threaded (M33-2.00)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injection Pump Drive(#310005-310046)

01***30	Bolt,(Not Used When Towing Winch)	2
01***30	Bolt,For Weight Adjusting Bolt	2
04***30	Ring, Snap	1
06***07	Bearing	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injection Pump Drive(#310047-)

01***30	Bolt,(Not Used When Towing Winch)	2
01***30	Bolt,For Weight Adjusting Bolt	2
04***30	Ring, Snap	1
06***07	Bearing	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injection Pump Mounting

01***15	Bolt	1
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	5
01***75	Bolt (M10-1.50x75)	1
01***65	Bolt - Transmission Tube Mounting	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injection Pump Repair Kit(#310047-)

65***40	Kit,Front Cover	1
65***60	Kit,Accessory	1
65***70	Kit,Gear Housing	1
65***80	Kit,Seal	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Injector

01***32	Washer, (Without Emergency Steering)	6
62***50	Bolt	6
65***11	Injector	6
65***12	Injector	6

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Return(#310005-310011)

01***95	Bolt,(For Shipping)	1
07***12	Washer, Gasket,(F5350-64a0 -24 )	4
07***20	Bolt,Joint	2
62***10	Tube	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Fuel Return(#310012-)

01***85	Bolt,(For Reversible Fan)	1
07***12	Washer, Gasket,(F5350-64a0 -24 )	4
07***20	Bolt,Joint	2
62***40	Tube	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Head Cover Related Parts

01***45	Bolt, Bracket Mounting	36
01***16	Washer,Radio Controlled Slag Handling	36
61***20	Rubber,(Fig.A1111)	36

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Heater Switch

01***30	Bolt,(With Body Positioner)	1
01***55	Bolt,(See Service News)	2
01***12	Bolt,(With Speedometer)	4
01***16	Washer,Radio Controlled Slag Handling	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Idler Gear

01***30	Bolt	6
01***80	Bolt	2
04***24	Pin,Dowel (For No.3 Housing)	1
61***11	Journal	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Injection Bracket And Piping

01***45	Bolt, Bracket Mounting	2
01***60	Bolt - Upper Cooler Inlet Tubemounting	1
01***70	Screw	2
01***25	Bolt,L.H. (For Add. Air Compressor)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Muffler

01***20	Bolt,(For Mono Lever Steering)	1
01***25	Bolt,(For Canvas Canopy?Head Guard)	3
01***35	Bolt,(F4320-52a0 -5 )	5
01***45	Bolt,(With Water Separator Type)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Name Plate And Caution Plate (English) (For Regulation Pf Epa)

04***50	Screw	4
62***70	Plate? Caution,Fuel Filter	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa) (For Eu Exhaust Gas Regulation)(#310024-)

04***50	Screw	4
61***11	Plate? License,(Limited Supply)	1
61***21	Plate, Name, (Limited Supply)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa) (For Eu Exhaust Gas Regulation)(#310047-)

04***50	Screw	4
61***11	Plate? License,(Limited Supply)	1
61***21	Plate, Name, (Limited Supply)	1
62***70	Plate? Caution,Fuel Filter	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Name Plate And Caution Plate (For Regulation Of Epa) (For Eu Exhaust Gas Regulation)(#310062-310090)

04***50	Screw	4
61***11	Plate? License,(Limited Supply)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Cooler

01***25	Bolt - Relay Mounting	4
07***42	O-Ring - Torque Converter Totransmission	2
07***12	Plug,(For Heater-Less)	2
61***41	Sleeve	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Cooler Mounting

01***25	Bolt,(For Canvas Canopy?Head Guard)	22
01***30	Bolt,(With Body Positioner)	4
01***65	Bolt - Return Line And Suction Linehose Clamps	4
01***80	Bolt,(With Corrosion Resistor)	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Filler

01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	3
01***30	Bolt - Lower Oil Cooler Outlet Tubemounting	1
07***00	Cap,Oil Filler	1
42***10	Bracket	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Filter

01***30	Bolt,(With Body Positioner)	8
01***16	Washer,Radio Controlled Slag Handling	8
07***12	Plug,(For Shipping) (Not Shown)	1
60***31	Cartridge, Oil Filter	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Level Gauge

61***10	Bushing, Oil Gauge Guide	1
61***20	Collar	1
61***30	Nut,(For Shipping)	1
61***30	Gauge, Oil Level	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Pan And Suction Tube

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***30	Bolt,(With Body Positioner)	4
01***35	Bolt,(F4320-52a0 -5 )	49
01***40	Bolt (Op)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Oil Pump

01***30	Bolt,(With Body Positioner)	2
01***40	Bolt (Op)	2
01***30	Bolt,(Water Separator Spec.)	6
01***32	Washer,(With Auto Emergency Steering)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Piston

02***13	Pin, Dowel	4
61***20	Ring, Snap	12
61***41	Bearing Assembly, Standard	6
61***10	Bolt	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Rear Power Take Off

01***25	Bolt,(Without Rops Guard? Canopy)	3
01***30	Bolt,For Weight Adjusting Bolt	1
62***80	Plate	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Rocker Arm And Housing

01***20	Bolt (M12-1.75x120)	60
01***15	Nut	1
07***12	O-Ring,(F4350-59a1 -17 )	6
61***30	Washer,(Service Parts)	60

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Rocker Arm Housing Cover

62***10	Cover, Head	6
62***10	Gasket,Head Cover (K1)	6

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)

60***21	Starting Motor Ass'Y,(7.5kw)	1
KD***20	Magnetic Switch Assembly	1
KD***40	Spring,Spring	4
KD***50	Brush Assembly	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Starting Motor Mounitng (7.5kw)

01***25	Bolt,(Without Rops Guard? Canopy)	2
01***45	Bolt,(For 60ton Dump Body)	6
01***10	Nut,(Dust?Drip Proof? Trimming S.)	2
01***32	Washer,(Not Used With Emergency Str.)	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Tension Pulley

01***20	Bolt, Wiring Harness Mounting Bracket	2
01***40	Bolt,For Weight Adjusting Bolt	8
01***20	Bolt, Hose Clamps (Inlet And Return Line Hoses)	2
01***40	Bolt, M10 X 40 12 Pt - Cranking Motor Mounting	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Thermostat Housing

01***25	Bolt,(For Canvas Canopy?Head Guard)	4
01***95	Capscrew	6
07***08	Plug,See Fig. K4010-63a0	2
07***15	Plug	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Turbocharger (Ktr110l-997a) (Inner Parts)

01***16	Bolt	4
01***16	Bolt	8
04***08	Pin, Dowel	1
04***50	Screw	2

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Turbocharger Mounting

61***90	Nut, Mounting	4
61***30	Stud	4
61***10	Gasket,Turbocharger Mounting	1
62***31	Gasket, Turbocharger	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Turbocharger Oil Piping

01***20	Bolt, Hose Clamps (Inlet And Return Line Hoses)	1
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	4
01***30	Bolt - Lower Oil Cooler Outlet Tubemounting	3
01***35	Bolt, Mount Bracket To Floor	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Water Pump

01***12	Bolt - M8 - 1.25 X 12	1
01***30	Bolt,(With Body Positioner)	4
01***15	Bolt	4
01***16	Washer,(For 35a Alternator)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Water Pump Gasket Kit

07***95	O-Ring,Transmission Strainer	1
07***12	O-Ring,(Fig.A5010)	1
07***40	O-Ring,(Fig.A5010)	1
07***22	Seal,(Fig.A5010)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Water Temperature Sensor

07***16	Plug	1
08***10	Connector, Clip	1
78***20	Sensor, Trans. Control Valve Oil Temperature	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Wiring

62***11	Harness, Wiring	1
62***20	Wire Harness	1
62***21	Wire Harness	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Wiring (1/3) (Fuel Control)

01***20	Bolt,(For Mono Lever Steering)	3
01***30	Bolt,(With Body Positioner)	1
01***65	Bolt - Return Line And Suction Linehose Clamps	1
01***25	Bolt,(Without Rops Guard? Canopy)	1

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Wiring (2/3) (Switch And Sensor)

01***25	Bolt,(For Canvas Canopy?Head Guard)	1
01***40	Bolt,For Weight Adjusting Bolt	2
01***00	Bolt,(For Front Brake Release)	1
01***08	Screw	4

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Komatsu : Saa6d170e-3a(S/N 310005-Up) : Engine : Wiring (3/3) (Controller Cover)

01***16	Bolt - Starting Motor Ground Cable	3
01***25	Bolt, Mount Engine Oil Drain To Fuel Tank	3
01***25	Screw	1
01***08	Nut,See Fig. K4010-04a0	3

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SAA6D170E-3A(S/N 310005-UP) serial number reference

The engine serial number is stamped on the engine block, typically on the left side near the injection pump, or on a metal data plate affixed to the engine. For the SAA6D170E-3A, the serial number range begins at 310005. The machine's chassis serial number (PIN) is located on the right-hand side of the cab on the lower frame or on the front frame casting, depending on the machine type (excavator, dozer, or loader).

Prefix	Identifies	Notes
310005	SAA6D170E-3A	Engine serial number start point for the SAA6D170E-3A/3D series. This range applies to the WA600-3L wheel loader (serial A52001-Up) and the PC1250-7/PC1250-8 excavator series. Verify with your dealer for specific machine application fitment.

Frequently asked questions

What engine does the Komatsu PC1250-7 use?

The Komatsu PC1250-7 excavator uses the SAA6D170E-3 series diesel engine, specifically the SAA6D170E-3A variant for serial numbers 310005 and up.

What is the operating weight of a Komatsu PC1250-7?

The operating weight of a Komatsu PC1250-7 varies by configuration, typically ranging from approximately 125,000 kg to 130,000 kg (275,578 lb to 286,600 lb) depending on the boom, stick, and counterweight setup.

What engine replaced the SAA6D170E-3A?

The SAA6D170E-3A was succeeded by the SAA6D170E-5 and later the SAA6D170E-7 series engines, which were introduced to meet stricter Tier 4 Final and Stage V emissions regulations.

What SAA6D170E-3A(S/N 310005-UP) owners discuss

What are the known powertrain and hydraulic behaviors for machines using the SAA6D170E-3A engine?

The engine is paired with hydraulic systems that are sensitive to oil temperature. Operators report that when hydraulic oil warms, viscosity decreases, which can expose excessive internal leakage in the pump, main control valve, or cylinders. If all functions (boom, arm, bucket, swing, travel) become slow simultaneously, the issue is likely shared supply, pump control, or engine performance rather than a single cylinder. If only one function is slow, the focus shifts to that specific circuit, such as the control valve spool or load-holding valve. The machine may also lose power under heavy digging load if the hydraulic system places excessive load on the engine or if the engine cannot produce expected power due to airflow or fuel restrictions. A common diagnostic pattern is that hydraulics work cold but become weak when hot, indicating internal wear or degraded oil rather than a complete pump failure. Have your dealer verify system pressures if performance drops significantly under load.

What undercarriage or wear patterns are typical for this machine type?

Machines in this class, such as the PC1250-7 and WA600-3 series, are designed for heavy earthmoving and quarry work. The undercarriage is subject to high stress from continuous load and dust exposure. Track tension must be monitored regularly because tracks that repeatedly loosen indicate issues with the tensioner or undercarriage wear. If the machine pulls to one side while traveling, check mechanical resistance first, including track tension, mud packed into the undercarriage, roller condition, and track-chain wear. If mechanical resistance is similar but one track runs slower, hydraulic or final-drive diagnosis is required. The line is noted for wearing out complete machines simultaneously; if a hydraulic pump fails, the engine may be near the end of its service life. Have your dealer verify undercarriage component wear and track tension specifications.

What are the engine quirks per the SAA6D170E-3A series?

The SAA6D170E-3A is a 6-cylinder, turbocharged, after-cooled diesel engine. It is used in models like the PC1250-7, WA600-3, and D375A-5. The engine operates with a liquid cooling system and is sensitive to cooling package efficiency. Overheating during heavy excavation is a known issue if material is packed between the radiator, hydraulic oil cooler, and charge-air cooler. The engine may idle normally but lose power when the operator combines boom, arm, and bucket movements. This requires checking air filters, fuel filters, fuel tank venting, and intake hoses. The engine weight is approximately 1,700 kg. It meets EU Stage II and Tier 2 standards. The bore and stroke are 170 mm (6.69 in) for each cylinder. Piston displacement is 1413 in³ (23.1 L). The engine is designed for high torque and heavy loads, but power loss can signal airflow restriction or injector wear. Have your dealer verify engine performance specifications and emissions compliance.

What are common electrical or sensor issues reported by owners?

Komatsu excavators rely heavily on electronic control systems. A single faulty sensor or unstable power supply can trigger multiple warning signals. Owners report intermittent starting, dashboard failure, or machines that randomly shut down. These issues often stem from battery state of charge, loose battery terminals, poor engine or chassis grounds, or damaged main starter cables. If the engine cranks but does not start, check for air entering the fuel supply or recent fuel-system maintenance errors. Multiple fault codes often indicate battery or ground issues rather than component failure. If the machine suddenly derates, check the exact warning and codes, as this may relate to engine or aftertreatment systems. Have your dealer verify electrical system integrity and sensor calibration.

What should be checked when buying a used SAA6D170E-3A (S/N 310005-UP) machine?

When inspecting a used machine with this engine serial range, verify the exact model and serial prefix against factory spec sheets, as configurations vary. Check the hydraulic oil level and condition, as degraded oil or incorrect specification can cause weak performance when hot. Inspect the cooling package for packed debris between heat exchangers. Test the engine under load to ensure it does not lose power when combining functions. Check for track tension and undercarriage wear, as tracks that loosen repeatedly indicate tensioner or component issues. Verify the battery state of charge and ground connections to rule out electrical causes for starting or shutdown issues. Check for multiple fault codes that may indicate sensor or power supply problems. Have your dealer verify the machine's serial range and configuration against factory documentation.

What are the fluid specifications for this engine?

Komatsu recommends using Komatsu Genuine fluids for optimal performance. For the engine, use Komatsu EO or TO diesel engine oil. For the hydraulic system, use Komatsu HO or AXO hydraulic oil. For the cooling system, use Komatsu Super-coolant AF-NAC. Always verify the specific fluid type required for your machine's operating environment and temperature range with your dealer. Have your dealer verify fluid specifications for your specific machine configuration.

What are the common causes of engine overheating in this series?

Engine overheating during heavy excavation is often caused by material packed between the radiator, hydraulic oil cooler, and charge-air cooler. The cooling package operates in a dusty environment, and external cleanliness does not guarantee internal flow. Check the coolant level when cold and fan operation. If the temperature rises during heavy work but falls when the machine idles, the cooling capacity may be marginal. If coolant is repeatedly expelled or the system becomes highly pressurized shortly after a cold start, deeper engine diagnosis may be required. Have your dealer verify cooling system pressure and flow.

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

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