Komatsuengine(no series)
Komatsu SA12V140-1U-98(S/N 11640-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SA12V140-1U-98 is a 12-cylinder, 30.5-liter diesel engine designed for heavy-duty applications in bulldozers, wheel loaders, dump trucks, and generators. It features a 140 mm bore and 165 mm stroke, delivering net power ranging from 574 kW (770 HP) to 603 kW (808 HP) depending on the specific configuration and operating mode. This engine powers large-scale earthmoving equipment, including the D475A-2 dozer and WA800-2/WA800-3 wheel loaders, with operating weights typically exceeding 60,000 lbs for the host machines. Production spans multiple generations of the SA12V140 series, with the 1U-98 variant specifically covering serial numbers 11640 and up. Configurations vary by application, offering high-power and economy modes, with options for retarders in mobile applications.
Across the SA12V140 series generations, Komatsu transitioned from mechanical governors to electronic control systems, improving fuel efficiency and emissions compliance. The SA12V140-1U-98 represents a later iteration in the 1-series lineage, succeeding earlier models like the SA12V140-1A and 1C variants. In the used and parts market, this engine remains critical due to its widespread installation in durable, high-hour machines like the D475A-2 and WA800 series. Its robust 12-cylinder architecture and availability of comprehensive overhaul kits make it a staple for fleet managers seeking reliable powertrains for heavy mining and construction duties, where downtime costs are high and component longevity is prioritized.
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 SA12V140-1U-98(S/N 11640-UP) specifications
Engine
| Model | SA12V140-1 |
| Gross Power | 783 kW (1,050 HP) @ 2,100 rpm |
| Net Power | 603 kW (808 HP) @ 2,000 rpm |
| Displacement | 30.5 L (30,480 cc) |
| Cylinders | 12 |
| Bore x Stroke | 140 mm x 165 mm |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | 1,715–2,000 mm (5.63–6.56 ft) |
| Transport Width | 1,252–1,515 mm (4.11–4.97 ft) |
| Transport Height | 1,475–2,000 mm (4.84–6.56 ft) |
| Transport Height (with exhaust) | 1,592 mm (5.22 ft) |
| Wheelbase or Track Gauge | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speeds | Not documented for this exact serial range — verify with your dealer |
| Lift/Dig/Dump/Drawbar | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Torque | 3,730–4,170 N·m (2,751–3,076 lbf·ft) @ 1,250–1,500 rpm |
Service capacities (summary)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | Not documented for this exact serial range — verify with your dealer |
| Cooling System | Not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu SA12V140-1U-98(S/N 11640-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the SA12V140-1U-98(S/N 11640-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Implement Komatsu KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead, aluminum) and contaminants (silicon, sodium). Track hydraulic particle count and viscosity changes to prevent pump and valve failures. Use KOMTRAX telematics to monitor fuel consumption, load frequency, and DEF levels, allowing for proactive scheduling before faults occur. Regular coolant SCA testing ensures proper corrosion inhibition and glycol concentration, protecting the 30.5-liter cooling system from overheating and liner cavitation.
Corrective & Common Repairs
Address common SA12V140-1U-98 issues by inspecting turbocharger seals and air filter elements to prevent contamination-induced wear. Replace fuel filters and drain the water separator regularly to avoid injector damage. Monitor hydraulic hose conditions and replace cracked lines to maintain system pressure. Check final drive oil for metal particles indicating gear wear. Inspect belt tension and hose clamps for leaks. Verify engine sensor functionality for temperature, fuel pressure, and oil pressure to prevent ECU lockout warnings and power reduction faults.
Overhaul & Rebuild Points
Plan major engine overhaul at 10,000 to 12,000 hours, focusing on piston rings, cylinder liners, and valve adjustments. Replace turbocharger bearings and injectors as needed based on performance analysis. Inspect the crankshaft and bearings for wear. For the powertrain, overhaul final drives and swing motors at similar intervals. Check structural integrity of the boom and stick welds. Replace all seals and gaskets during major service to prevent fluid leaks and maintain compression. Use Komatsu Genuine Lubricants to ensure optimal component life during reassembly.
Seasonal & Environment Servicing
In cold climates, check coolant freeze protection and use appropriate viscosity engine oil to ensure cold starts. Inspect battery health and charge level to prevent failure in low temperatures. In hot environments, clean radiator and oil cooler fins daily to prevent overheating. Monitor coolant levels frequently and check for leaks. In dusty conditions, inspect air filter restriction indicators more often and replace elements as needed. Ensure DEF tank is filled and heated if required. Adjust track tension for undercarriage wear and ground conditions to maximize traction and reduce component stress.
SA12V140-1U-98(S/N 11640-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-7111 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6215-71-6201 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 6215-51-5690 | Grommet,Oil Filter | Lubrication service | Check fitment → |
| 600-211-1101 | Oil Filter Sub A | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SA12V140-1U-98(S/N 11640-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the sensor pin. | Inspect the sensor wiring and connector; replace the speed sensor if voltage is abnormal. |
| CA111 | Internal engine controller fault | Malfunction within the Electronic Control Module (ECM) or engine controller. | Check ECM power and ground connections; replace or reprogram the ECM if the fault persists. |
| CA451 | Common rail pressure sensor feedback value too high | Faulty rail pressure sensor, actual overpressure condition, or sensor wiring issue. | Diagnose the fuel rail pressure sensor and check pump lines for blockage or leakage. |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or loose/corroded battery terminals. | Check battery charge and alternator output; replace the battery or alternator as needed. |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake air pressure sensor or shorted wiring harness. | Verify the intake pressure sensor operation and inspect the wiring for damage. |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit, restricted airflow, or intake system blockage. | Check for sensor short circuits and inspect the intake air path for restrictions. |
| CA234 | Engine overspeed | Throttle calibration error, excessive engine load cycle, or operator misuse. | Verify throttle calibration and inspect the engine load cycle and control links. |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty Intake Air Temperature (IAT) sensor or open circuit. | Test the IAT sensor and replace it if the voltage reading is out of specification. |
| CA428 | Fuel moisture sensor feedback voltage too high | Contaminated fuel supply or faulty fuel moisture sensor harness. | Ensure a clean fuel supply and check the moisture sensor harness for damage. |
| CA553 | Common rail pressure too high | Malfunction in the fuel pump regulator (IMV/PCV) or pressure sensor error. | Evaluate the fuel pump regulator and inspect the pressure sensor circuit. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SA12V140-1U-98(S/N 11640-UP) attachments & work tools
Bulldozer Attachments
The SA12V140-1U-98 engine powers the D475A-2 bulldozer, which utilizes a standard dozer blade configuration. Factory guarding options include the retarder system, which is listed as an available option for this machine class.
Wheel Loader Attachments
This engine is specified for the WA800-2 and WA800-3 wheel loaders. Typical work tools include bucket configurations for these models, with hydraulic arrangements dependent on the specific loader frame and attachment interface.
Mining Dump Truck Attachments
The SA12V140-1U-98 is used in the HD785-3, HD785-5, HD985-3, and HD985-5 mining dump trucks. These machines utilize standard dump body configurations for hauling, with no specific external work tool families other than the integral body.
Generator Set Configurations
The engine is applied to the EG750B-1L generator set and the DCA-800SSK mobile generator. These configurations utilize the engine for stationary or mobile power generation rather than mechanical work tools.
Engine Specifications and Dimensions
The SA12V140-1U-98 is a 12-cylinder engine with a 140 mm bore and 165 mm stroke, displacing 30.5 liters. Overall dimensions vary by configuration: length ranges from 1,715 mm to 2,000 mm, width from 1,450 mm to 1,515 mm, and height from 1,475 mm to 1,592 mm.
Performance Ratings
Flywheel horsepower ratings vary by application mode, ranging from 574 kW (770 HP) at 2,000 rpm to 603 kW (808 HP) at 2,000 rpm. Torque specifications include values such as 11,010 N·m at 2,100 rpm and 3,730 N·m at 1,400 rpm depending on the specific net rating.
All SA12V140-1U-98(S/N 11640-UP) assemblies by section
Every catalogued assembly group for the Komatsu SA12V140-1U-98(S/N 11640-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : After Cooler Water Piping (Cold Terrain Spec.) (Except Japan)(#12774-)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor (Front) (Inner Parts)(#11755-)
| 62***01 | Air Compressor A.,(See Fig.A7010-D7a3) | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor (Rear) (Inner Parts)(#11755-)
| 62***01 | Air Compressor A.,(See Fig.A7010-E7a3) | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
| DK***40 | Gasket,Air Compressor | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor And Mounting(#11755-)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***95 | Capscrew - M12 | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor Gasket Kit(#11755-)
| 07***00 | O-Ring (K8) | 2 |
| 07***00 | O-Ring,(For Dual Water Pump) | 2 |
| 07***19 | Gasket,(For Hd325-6) (See Fig.A7010) | 11 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor Piping (1/2)(#11755-)
| 01***35 | Bolt,(For Fix Position) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***50 | Bolt,(Spark Arrester Spec.) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Compressor Piping (2/2)(#11755-)
| 01***45 | Screw | 1 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 1 |
| 01***35 | Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Intake Manifold And After Cooler (1/2) (L.H. Bank) (Cold Terrain Spec.) (Except Japan)(#12774-)
| 01***00 | Bolt,(For Front Brake Release) | 9 |
| 01***10 | Bolt,(With Joy Stick Steering) | 3 |
| 01***60 | Bolt | 11 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Intake Manifold And After Cooler (1/2) (L.H. Bank) (For Electrical Governor)(#11755-)
| 01***00 | Bolt,(For Front Brake Release) | 9 |
| 01***10 | Bolt,(With Joy Stick Steering) | 3 |
| 01***60 | Bolt | 11 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Intake Manifold And After Cooler (2/2) (R.H. Bank) (Cold Terrain Spec.) (Except Japan)(#12774-)
| 01***00 | Bolt,(For Front Brake Release) | 8 |
| 01***10 | Bolt,(With Joy Stick Steering) | 4 |
| 01***60 | Bolt | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Intake Manifold And After Cooler (2/2) (R.H. Bank) (For Electrical Governor)(#11755-)
| 01***00 | Bolt,(For Front Brake Release) | 9 |
| 01***10 | Bolt,(With Joy Stick Steering) | 3 |
| 01***60 | Bolt | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Vent(#11755-11883)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***30 | Bolt, Mount Control Valve | 8 |
| 01***10 | Bolt,(With Joy Stick Steering) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Vent(#11884-12236)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***30 | Bolt, Mount Control Valve | 8 |
| 01***10 | Bolt,(With Joy Stick Steering) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Air Vent(#12237-)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***30 | Bolt, Mount Control Valve | 8 |
| 01***10 | Bolt,(With Joy Stick Steering) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator (50a) (Inner Parts)(#11755-)
| 60***21 | Alternator A. (50a),(With Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator (75a) (Inner Parts)
| 60***30 | Alternator A. (75a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator (90a) (Inner Parts)(#12106-)
| 60***30 | Alternator A. (90a) | 1 |
| KD***02 | Bolt | 4 |
| KD***02 | Washer,Spring | 5 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Drive (For 50a And 75a)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 6 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Drive (For 90a Alternator)(#11640-12105)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 6 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Drive (For 90a)(#12106-)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 6 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Mounting (50a)(#11755-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***20 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Mounting (75a)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***20 | Bolt,For Weight Adjusting Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Mounting (90a)(#11640-12105)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***55 | Bolt - Mount Cage To Transmission Case | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Alternator Mounting (90a)(#12106-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***55 | Bolt - Mount Cage To Transmission Case | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Amplifier (Vhms Spec.)(#11755-)
| 62***50 | Amplifier | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Blowby Sensor (For Electrical Governor) (Vhms Spec.) (R.H. Bank)(#13163-)
| 01***20 | Bolt,See Fig. K4010-11a0 | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
| 01***45 | Bolt, Bracket Mounting | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather (For Electrical Governor)(#11755-11948)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***40 | Bolt (Op) | 4 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather And Front Seal (For Electrical Governor) (Vhms Spec.) (L.H. Bank)(#11755-13162)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***40 | Bolt (Op) | 2 |
| 01***85 | Bolt, Divider Valve Mounting | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather And Front Seal (For Electrical Governor) (Vhms Spec.) (L.H. Bank)(#13163-)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***40 | Bolt (Op) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather And Front Seal (For Electrical Governor) (Vhms Spec.) (R.H. Bank)(#11755-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***40 | Bolt (Op) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather And Front Seal (For Electrical Governor)(#11949-12743)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Breather And Front Seal (For Electrical Governor)(#12744-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Bypass Filter (For Hd785-5 And Hd985-5)(#11773-12363)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 07***23 | O-Ring,(For Shipping) (K6) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Bypass Filter (For Hd785-5 And Hd985-5)(#12364-)
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***85 | Bolt, Divider Valve Mounting | 2 |
| 07***23 | O-Ring,(For Shipping) (K6) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Camfollower And Tachometer Drive Shaft(#11949-)
| 01***85 | Bolt (M10-1.50x85) | 2 |
| 01***80 | Bolt (M12-2.00x80) | 12 |
| 01***80 | Bolt (M10-1.50x80) | 34 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Camfollower Cover (For Electrical Governor)(#11755-)
| 01***20 | Bolt,(For Japan Pc200) | 62 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 45 |
| 62***20 | Cover,Camfollower | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Camfollower(#11949-)
| 04***12 | Ring, Retaining | 48 |
| 61***20 | Ball | 1 |
| 62***00 | Lever, Cam Follower | 24 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Camshaft And Camfollower (For Electrical Governor)(#11755-11948)
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Camshaft And Gear(#11949-)
| 01***20 | Bolt (M12-1.75x20) | 4 |
| 04***25 | Key, Plain Woodruff | 1 |
| 62***20 | Gear, Camshaft (Left Hand) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cooling Fan(#11755-)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 60***50 | Fan,Cooling | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cooling System Piping(#11755-11883)
| 01***75 | Bolt,(For 75a Alternator) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cooling System Piping(#11884-12236)
| 01***75 | Bolt,(For 75a Alternator) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cooling System Piping(#12237-)
| 01***75 | Bolt,(For 75a Alternator) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Corrosion Resistor
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 07***06 | O-Ring,Corrosion Resistor | 1 |
| 07***14 | O-Ring,(F4350-63a1a-2 ) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Coupling (For Electrical Governor) (For Ec Regulation) (Inner Parts)(#11794-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 65***01 | Coupling Ass'Y | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Crank Pulley
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***21 | Bolt | 6 |
| 62***30 | Pulley? Hardening | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Crankshaft
| 04***28 | Key, Plain Woodruff | 1 |
| 62***01 | Main Metal Ass'Y | 1 |
| 62***11 | Main Metal Ass'Y,No.1?2?3?5?6?7 | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Block (For Electrical Governor)(#11755-11948)
| 01***20 | Bolt | 12 |
| 01***25 | Screw | 12 |
| 01***16 | Washer,(With Water Separator) | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Block Cover (For Electrical Governor)(#11755-11948)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 26 |
| 62***10 | Cover, Water Header | 2 |
| 62***81 | Gasket, Water Header Cover | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Block Gasket Kit(#11755-)
| 07***12 | O-Ring, Between Valve And Pump | 1 |
| 07***15 | O-Ring,(Without Boom Kickout) | 2 |
| 07***21 | O-Ring,Water Piping | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Block Related Parts (For Electrical Governor)(#11949-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 26 |
| 07***08 | Plug,(Without Auto Priming System) | 1 |
| 62***10 | Cover, Water Header | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Block(#11949-)
| 01***25 | Screw | 12 |
| 01***16 | Washer,(With Water Separator) | 12 |
| 01***60 | Washer,(Without Rops Guard? Canopy) | 14 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Head Gasket Kit(#11755-)
| 02***75 | O-Ring,(See Fig.A1310) | 8 |
| 07***21 | O-Ring,Water Piping | 24 |
| 07***25 | O-Ring,Corrosion Resistor | 5 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Cylinder Head(#11755-)
| 01***16 | Bolt,(For Shipping) | 12 |
| 01***20 | Bolt (M10-1.75x120) | 12 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Damper
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 12 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Electrical Wiring (For Electrical Governor) (For Ec Regulation)(#11755-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 8 |
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Electrical Wiring (For Electrical Governor) (Harness Heavy Duty Type)(#11755-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 8 |
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Electrical Wiring (For Electrical Governor)(#11755-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 8 |
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Engine Support And Bracket(#11755-)
| 01***50 | Bolt, Fuel Tank Mounting - Front Left | 8 |
| 01***50 | Bolt - Differential Carrier | 8 |
| 01***60 | Flat Washer - M20 (Hardened) | 8 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Brake (Inner Parts)(#11755-11807)
| 62***01 | Exhaust Brake Ass'Y | 2 |
| JK***22 | Seal,Ring | 2 |
| JK***05 | Nut | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Brake (Inner Parts)(#11808-12623)
| 62***02 | Exhaust Brake Ass'Y | 2 |
| JK***48 | Screw | 2 |
| JK***66 | Bolt | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Brake (Inner Parts)(#12624-13122)
| 62***02 | Exhaust Brake Ass'Y | 2 |
| JK***48 | Screw | 2 |
| JK***66 | Bolt | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Brake (Inner Parts)(#13123-)
| 62***02 | Exhaust Brake Ass'Y | 2 |
| MY***18 | Brake Valve Ass'Y | 1 |
| MY***07 | Cover | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Brake And Mounting(#11755-)
| 01***25 | Bolt,Joint | 8 |
| 01***35 | Capscrew | 4 |
| 01***40 | Capscrew | 8 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Manifold
| 01***95 | Bolt | 48 |
| 61***50 | Stud, Mounting | 4 |
| 62***81 | Gasket, Exhaust Manifold | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Exhaust Manifold (Vhms Spec.)(#11755-)
| 01***95 | Bolt | 48 |
| 08***12 | Clip | 2 |
| 61***20 | Clip,(For D57sr) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fan Drive(#11755-)
| 01***35 | Bolt,(For Pedal Steering) | 2 |
| 01***35 | Bolt | 2 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fan Pulley
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 6 |
| 62***90 | V-Belt Set | 1 |
| 62***60 | Pulley? Hardening | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Flywheel Housing (For Electrical Governor)(#11755-)
| 01***30 | Screw | 3 |
| 01***65 | Bolt,L.H | 14 |
| 01***30 | Bolt, Tank Mounting | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Flywheel(#11755-)
| 01***60 | Bolt (M20-1.50x60) | 10 |
| 61***20 | Washer, Plain (M20) | 10 |
| 62***00 | Flywheel Ass'Y | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Front Cover (For Electrical Governor)(#11755-11948)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***75 | Bolt - Tube Mounting | 7 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Front Cover(#11949-)
| 01***75 | Bolt - Tube Mounting | 7 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Controller (For Hd785?Hd985-5) (High Altitude Spec.)(#13101-)
| 78***03 | Controller | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Controller (Forwarded Individually Parts) (For Hd985)(#11884-)
| 78***00 | Controller | 1 |
| 78***01 | Controller | 1 |
| 78***02 | Controller | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Filter (For Electrical Governor)(#11755-12363)
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 60***11 | Cartridge,Fuel Filter | 2 |
| 61***31 | Plug,(Not Shown) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Filter(#12364-)
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 60***11 | Cartridge,Fuel Filter | 2 |
| 61***31 | Plug,(Not Shown) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Nozzle And Spill Pipe(#11755-)
| 01***20 | Capscrew | 12 |
| 07***21 | O-Ring,Oil Cooler Pipe | 24 |
| 07***21 | Seal, O-Ring | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Coupling) (For Electrical Governor) (Inner Parts)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 65***01 | Coupling Ass'Y | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (L.H.) (1/2) (For Electrical Governor) (Inner Parts)
| 01***45 | Bolt | 4 |
| 01***80 | Bolt | 6 |
| 01***80 | Bolt | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (L.H.) (1/2)(For Electrical Governor)(Ec Regulation)(Inner Parts)(#11794-)
| 01***45 | Bolt | 4 |
| 01***80 | Bolt | 6 |
| 01***80 | Bolt | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (L.H.) (2/2) (For Electrical Governor) (Inner Parts)
| 01***30 | Bolt (Itl) | 1 |
| 01***80 | Bolt | 2 |
| 01***30 | Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (L.H.) (2/2)(For Electrical Governor)(For Ec Regulation)(Inner Parts)(#11794-)
| 01***30 | Bolt (Itl) | 1 |
| 01***80 | Bolt | 2 |
| 01***30 | Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (R.H.) (1/2) (For Electrical Governor) (Inner Parts)
| 01***45 | Bolt | 4 |
| 01***80 | Bolt | 6 |
| 01***80 | Bolt | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (R.H.) (1/2)(For Electrical Governor)(For Ec Regulation)(Inner Parts)(#11794-)
| 01***45 | Bolt | 4 |
| 01***80 | Bolt | 6 |
| 01***80 | Bolt | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (R.H.) (2/2) (For Electrical Governor) (Inner Parts)
| 01***30 | Bolt (Itl) | 1 |
| 01***80 | Bolt | 2 |
| 01***30 | Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Governor) (R.H.) (2/2)(For Electrical Governor)(For Ec Regulation)(Inner Parts)(#11794-)
| 01***30 | Bolt (Itl) | 1 |
| 01***80 | Bolt | 2 |
| 01***30 | Bolt | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (L.H.) (1/2) (For Electrical Governor) (For Ec Regulation) (Inner Parts)(#11794-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 2 |
| 01***35 | Bolt | 4 |
| 01***30 | Bolt (Itl) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (L.H.) (1/2) (For Electrical Governor) (Inner Parts)
| 01***12 | Bolt - M8 - 1.25 X 12 | 2 |
| 01***35 | Bolt | 4 |
| 01***30 | Bolt (Itl) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (L.H.) (2/2) (For Electrical Governor) (For Ec Regulation) (Inner Parts)(#11794-)
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 65***01 | Valve Ass'Y | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (L.H.) (2/2) (For Electrical Governor) (Inner Parts)
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 65***01 | Valve Ass'Y | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (R.H.) (1/2) (For Electrical Governor) (For Ec Regulation) (Inner Parts)(#11794-)
| 01***12 | Bolt (M8-1.25x12) | 2 |
| 01***35 | Bolt | 4 |
| 01***30 | Bolt (Itl) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (R.H.) (1/2) (For Electrical Governor) (Inner Parts)
| 01***12 | Bolt (M8-1.25x12) | 2 |
| 01***12 | Bolt - M8 - 1.25 X 12 | 2 |
| 01***35 | Bolt | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (R.H.) (2/2) (For Electrical Governor) (For Ec Regulation ) (Inner Parts)(#11794-)
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 65***01 | Valve Ass'Y | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump (Pump) (R.H.) (2/2) (For Electrical Governor) (Inner Parts)
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 65***01 | Valve Ass'Y | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Bracket (For Electrical Governor)(#11755-12669)
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 4 |
| 01***95 | Capscrew | 8 |
| 62***31 | Pin,Dowel | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Bracket (For Electrical Governor)(#12670-)
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 4 |
| 01***95 | Capscrew | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Drive (For Hd785-5 And Hd985-5)(#11755-12363)
| 01***30 | Bolt,(Not Used When Towing Winch) | 8 |
| 01***20 | Bolt, Mount Spool Covers | 6 |
| 01***13 | Nut, Regular Hexagon (M22-1.25) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Drive (For Hd785-5 And Hd985-5)(#12364-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 8 |
| 01***20 | Bolt, Mount Spool Covers | 6 |
| 01***13 | Nut, Regular Hexagon (M22-1.25) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Lubricating (1/2) (L.H. Bank) (For Electrical Governor)(#11755-)
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Lubricating (2/2) (R.H. Bank) (For Electrical Governor)(#11755-)
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Mounting (For Electrical Governor)
| 01***00 | Bolt | 8 |
| 01***32 | Washer, (Without Emergency Steering) | 8 |
| 07***08 | Plug,(Without Lock-Up), Plug | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Mounting (For Electrical Governor) (For Ec Regulation)(#11794-)
| 01***00 | Bolt | 8 |
| 01***32 | Washer, (Without Emergency Steering) | 8 |
| 07***08 | Plug,(Without Lock-Up), Plug | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Piping (1/2) (L.H. Bank) (For Electrical Governor)(#11755-12983)
| 01***25 | Capscrew | 7 |
| 01***30 | Screw | 7 |
| 01***35 | Bolt | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Piping (1/2) (L.H. Bank) (For Electrical Governor)(#12984-)
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Piping (2/2) (R.H. Bank) (For Electrical Governor)(#11755-12983)
| 01***25 | Capscrew | 7 |
| 01***30 | Screw | 7 |
| 01***35 | Bolt | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Injection Pump Piping (2/2) (R.H. Bank) (For Electrical Governor)(#12984-)
| 01***30 | Screw | 11 |
| 01***35 | Bolt | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Piping (1/2) (L.H. Bank) (For Electrical Governor)(#11755-12363)
| 01***16 | Bolt - Box Mounting | 3 |
| 01***50 | Capscrew | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Piping (1/2) (L.H. Bank) (For Electrical Governor)(#12364-)
| 01***50 | Capscrew | 1 |
| 01***60 | Bolt,(With Body Positioner) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Piping (2/2) (R.H. Bank) (For Electrical Governor)(#11755-12363)
| 01***40 | Screw, Hex Socket | 4 |
| 01***55 | Screw | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Piping (2/2) (R.H. Bank) (For Electrical Governor)(#12364-)
| 01***40 | Screw, Hex Socket | 4 |
| 01***55 | Screw | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Return (L.H. Bank) (For Electrical Governor)(#11755-12108)
| 04***10 | Clip | 1 |
| 07***12 | Gasket,Mechanical Pump Piping | 3 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 5 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Return (L.H. Bank) (For Electrical Governor)(#12109-)
| 01***30 | Screw | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Return (R.H. Bank) (For Electrical Governor)(#11755-12108)
| 04***10 | Clip | 1 |
| 07***12 | Gasket,Mechanical Pump Piping | 3 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Fuel Return (R.H. Bank) (For Electrical Governor)(#12109-)
| 01***25 | Bolt,(Rear Attachment Less) | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Gear Case (For Electrical Governor)(#11755-11948)
| 01***30 | Bolt,(Not Used When Towing Winch) | 13 |
| 07***08 | Plug,(Without Lock-Up), Plug | 4 |
| 07***16 | Plug, Expansion | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Gear Case Related Parts (For Electrical Governor) (Vhms Spec.)(#11755-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 13 |
| 07***08 | Plug,(Without Lock-Up), Plug | 4 |
| 07***16 | Plug, Expansion | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Gear Case Related Parts (For Electrical Governor)(#11949-12743)
| 01***30 | Bolt,(Not Used When Towing Winch) | 13 |
| 07***08 | Plug,(Without Lock-Up), Plug | 4 |
| 07***16 | Plug, Expansion | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Gear Case Related Parts (For Electrical Governor)(#12744-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 13 |
| 07***08 | Plug,(Without Lock-Up), Plug | 4 |
| 07***16 | Plug, Expansion | 9 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Head Cover And Shield Plate(#11640-11948)
| 01***55 | Screw | 36 |
| 62***11 | Cover,Rocker Arm Housing | 12 |
| 62***20 | Gasket, Rocker Lever Housing | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Head Cover(#11949-)
| 01***55 | Screw | 36 |
| 62***11 | Cover,Rocker Arm Housing | 12 |
| 62***20 | Gasket, Rocker Lever Housing | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Heat Shield (For Wa800?900-2 And Hd785?985-3)
| 01***35 | Capscrew | 8 |
| 01***40 | Capscrew | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Heater Switch (L.H. Bank)(#11755-)
| 01***12 | Bolt,(With Speedometer) | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Heater Switch (R.H. Bank)(#11755-)
| 01***12 | Bolt,(With Speedometer) | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 6 |
| 01***12 | Bolt,(See Fig.0501) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Idler Gear
| 01***40 | Bolt (Op) | 12 |
| 01***80 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***10 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Lift Pump (For Electrical Governor) (Inner Parts)(#11755-12363)
| 65***00 | Lift Pump Assembly | 1 |
| DK***91 | Feed Pump Ass'Y | 1 |
| DK***00 | Valve,Check | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Lift Pump(#12364-)
| 01***16 | Bolt - Box Mounting | 3 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 62***50 | Adapter | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Name Plate And Caution (Japanese-English)
| 04***60 | Screw, Serial Number Plate | 4 |
| 60***40 | Plate? Name,(Limited Supply) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Nozzle Holder (Inner Parts)(#11755-)
| 62***12 | Holder Ass'Y,(See Fig.A4210-B7a4) | 12 |
| DK***00 | Shim? 0.725mm | 0 |
| DK***00 | Shim? 0.525mm | 0 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Adapter (Vhms Spec.)(#11755-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 3 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
| 01***80 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Adapter (With Alarm)(#11755-12236)
| 01***12 | Bolt - M8 - 1.25 X 12 | 3 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
| 01***80 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Adapter (With Oil Pressure Switch And Alarm) (Vhms Spec.)(#11801-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 3 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
| 01***80 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Adapter (With Oil Pressure Switch And Alarm)(#12237-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 3 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
| 01***80 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Adapter(#11755-)
| 01***12 | Bolt - M8 - 1.25 X 12 | 3 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 1 |
| 01***80 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Cooler (Cold Terrain Spec.)(#12319-)
| 01***30 | Bolt,(With Body Positioner) | 24 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Cooler Mounting(#11949-)
| 01***75 | Bolt (M10-1.50x75) | 4 |
| 07***40 | O-Ring,Cooling Valve | 1 |
| 07***40 | O-Ring,(For Hd325-6?Hm400-1) (A3110) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Cooler(#11640-11948)
| 01***30 | Bolt,(With Body Positioner) | 24 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 2 |
| 01***75 | Bolt (M10-1.50x75) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Cooler(#11949-)
| 01***30 | Bolt,(With Body Positioner) | 24 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 2 |
| 07***16 | O-Ring (K2) | 8 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filler (With Oil Level Sensor)(#11755-)
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***11 | Nut,(With Under Mirror) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filler(#11755-)
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***11 | Nut,(With Under Mirror) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filter (Vhms Spec.)(#11755-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 13 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filter (With Alarm) (For Hd985-5)(#11755-12236)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filter (With Oil Pressure Switch And Alarm) (Vhms Spec.)(#11801-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 15 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filter (With Oil Pressure Switch And Alarm)(#12237-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***30 | Bolt,(With Body Positioner) | 11 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Filter(#11755-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***30 | Bolt,(With Body Positioner) | 11 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Level Gauge (Cold Terrain Spec.) (For Hd985-5)(#12472-)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 1 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 1 |
| 07***27 | Nut, Tube | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Level Gauge (With Oil Level Sensor)(#11794-)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 1 |
| 07***12 | O-Ring,(Extreme Cold Terrain Spec.) (K2) | 1 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Level Gauge(#11755-)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 1 |
| 07***12 | O-Ring,(Extreme Cold Terrain Spec.) (K2) | 1 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pan And Suction Tube (Cold Terrain Spec.) (For Hd985-5)(#12472-)
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pan And Suction Tube (With Oil Level Sensor)(#11794-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 27 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pan And Suction Tube(#11755-)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 27 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Sensor (Vhms Spec.)(#11755-)
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Sensor (With Alarm)(#11755-12236)
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Sensor (With Oil Pressure Switch And Alarm) (Vhms Spec.)(#11801-)
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Sensor (With Oil Pressure Switch And Alarm)(#12237-)
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Sensor(#11755-)
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Switch (Vhms Spec.)(#11801-)
| 08***05 | Switch,Engine Oil Pressure | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pressure Switch(#12237-)
| 08***05 | Switch,Engine Oil Pressure | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Oil Pump
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***55 | Bolt,(See Service News) | 1 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 5 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 2 |
| 04***20 | Ring, Retaining | 24 |
| 62***33 | Piston Ring Ass'Y,Per Cylinder | 12 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Pm-Clinic(#11755-)
| 04***10 | Clip,(F4320-51a0 -8 ) | 2 |
| 07***00 | Elbow,(F4320-54a0 -6 ) | 2 |
| 08***12 | Clip, Clip,(With Auto Emergency Steering) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Rocker Arm And Housing (For Electrical Governor)(#11755-11948)
| 01***85 | Bolt (M10-1.50x85) | 2 |
| 01***80 | Bolt (M12-2.00x80) | 12 |
| 01***80 | Bolt (M10-1.50x80) | 34 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Safety Guard (Injection Pump Drive) (For Electrical Governor)(#11755-)
| 01***20 | Bolt,(For Mono Lever Steering) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***75 | Bolt (M10-1.50x75) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Shield Plate(#11949-)
| 62***10 | Plate,Heat Shield | 2 |
| 62***11 | Plate,Heat Shield | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)(#11755-12657)
| 60***31 | Starting Motor Ass'Y,(7.5kw) | 2 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Starting Motor (7.5kw) (Inner Parts)(#12658-)
| 60***32 | Starting Motor Ass'Y,(7.5kw) | 2 |
| KD***20 | Magnetic Switch Assembly | 1 |
| KD***40 | Spring,Spring | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Starting Motor Mounting (7.5kw)(#11755-13249)
| 01***40 | Bolt,(With Center Guard) | 6 |
| 01***40 | Bolt (Kit) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Tension Pulley
| 01***10 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***16 | Bolt - Seat And Tether Belt Mounting | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Thermostat And Mounting (Without Air Comppressor)(#11755-)
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Tool(#11755-12363)
| 07***23 | Clamp,Hose | 1 |
| 07***80 | Hose | 1 |
| 62***00 | Drain Hose Ass'Y,(Except Japan) (Op) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Tool(#12364-)
| 07***23 | Clamp,Hose | 1 |
| 07***80 | Hose | 1 |
| 62***00 | Drain Hose Ass'Y,(Except Japan) (Op) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Turbocharger (Ktr110g-F45c) (For Hd985-5) (Inner Parts)(#11834-)
| 01***16 | Bolt | 4 |
| 01***16 | Bolt | 8 |
| 01***16 | Bolt | 8 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Turbocharger Cooling (Water Innlet Line) (For Hd985-5)(#11834-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
| 07***19 | Gasket,(For Hd325-6) (See Fig.A7010) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Turbocharger Cooling (Water Outlet Line) (For Hd985-5)(#11834-)
| 01***25 | Capscrew | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Turbocharger Mounting (For Hd985-5)(#11834-)
| 01***25 | Bolt,Joint | 8 |
| 61***90 | Nut, Mounting | 8 |
| 61***10 | Screw | 4 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Turbocharger Oil Piping (For Hd985-5)(#11834-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 6 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Water Piping (For Electrical Governor)(#11755-)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Water Pump Gasket Kit(#11755-)
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 07***80 | O-Ring,Hydraulic Oil Filter | 1 |
| 07***90 | O-Ring,(Dk029369-0020) (K2) | 1 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Water Pump(#11755-11883)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Water Pump(#11884-12236)
Komatsu : Sa12v140-1u-98(S/N 11640-Up) : Engine : Water Pump(#12237-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
SA12V140-1U-98(S/N 11640-UP) serial number reference
The engine serial number plate is located on or near the valve cover on the left side of the Komatsu SA12V140-1U-98 engine block. The prefix is part of the engine model designation stamped on this plate, distinct from the machine chassis serial number.
| Prefix | Identifies | Notes |
|---|---|---|
| SA12V140-1U-98 | Engine model and configuration code | Identifies the specific SA12V140-1U-98 engine variant. Serial range 11640-UP is documented for this specific code in factory parts catalogs and service manuals. No other 3-character PIN prefixes are explicitly tied to this engine model in the provided sources. |
Frequently asked questions
What is the engine type and displacement?
The Komatsu SA12V140-1U-98 is a 12-cylinder, 30.5-liter (30,480 cc) diesel engine with a 140 mm bore and 165 mm stroke.
What is the operating weight of the host machines?
Operating weight varies by configuration and series, typically ranging from 60,000 lbs to over 87,000 lbs for machines like the D475A-2 dozer and WA800 wheel loader.
What replaced the SA12V140-1U-98?
The SA12V140 series was succeeded by the SAA12V140E-3 and later SAA6D140E-3 engines, which introduced electronically controlled common rail fuel injection and improved emissions compliance.
What SA12V140-1U-98(S/N 11640-UP) owners discuss
What are the core mechanical specifications and power output for the SA12V140-1U-98 engine?
The engine is a 12-cylinder, 140 mm bore by 165 mm stroke configuration with a total displacement of 30.5 liters (30,480 cc). Net power output varies by application mode: 574 kW (770 HP) at 2,000 rpm in standard mode, 588 kW (789 HP) at 2,000 rpm in high-power mode, and 603 kW (808 HP) at 2,100 rpm in high-output mode. Torque ranges from 3,730 Nm (2,752 lbf-ft) at 1,400 rpm to 4,170 Nm (3,077 lbf-ft) at 1,500 rpm depending on the specific configuration. The firing order is R1-L1-R5-L5-R3-L3-R6-L6-R2-L2-R4-L4. Dimensions include an overall length of 1,715 mm to 2,000 mm and a width of 1,450 mm to 1,515 mm. These values vary by configuration/series based on the specific machine application (e.g., D475A-2 dozer vs. WA800-3 loader). Source: Komatsu 12V140-1 Series Diesel Engine Service Repair Manual; Komatsu Shop Manual SEBM028318.
What are the common hydraulic troubleshooting patterns for Komatsu excavators using this engine platform?
Diagnosis should follow a pattern of single-function versus all-function weakness. If all hydraulic functions (boom, arm, bucket, swing, travel) are slow simultaneously, check the hydraulic oil level, correct oil specification, hydraulic filters, engine RPM under load, and oil temperature. If only one function is slow, investigate the specific cylinder, control valve spool, load-holding valve, or pilot input for that circuit. A machine that works cold but becomes weak when hot indicates internal leakage in pumps, main control valves, or motors due to decreased viscosity at operating temperature. Always verify engine speed remains stable under load to distinguish between engine power loss and hydraulic system drag. Source: Heavy Machinery Club Komatsu Excavator Troubleshooting Guide.
What undercarriage and wear patterns are typical for heavy Komatsu machines like the D475A-2 or WA800 series?
Operators report that track tension must be monitored closely as tracks repeatedly loosen under heavy load. Pulling to one side during travel often stems from mechanical resistance (mud/debris in undercarriage, roller condition, track-chain wear) rather than hydraulic failure; test in both forward and reverse to confirm. Final drive noise typically indicates low oil levels or contamination. Swing system weakness may involve the swing motor, control valve, or swing brake release. For heavy mining-class applications, ground pressure and track shoe width are critical planning factors. Source: Heavy Machinery Club Komatsu Excavator Troubleshooting Guide; Heavy Equipment Specs Directory.
What are the common engine quirks and maintenance requirements for the SA12V140-1 series?
The SA12V140-1 series requires Komatsu EO or TO specification hydraulic oil and appropriate engine oil (e.g., Komatsu AXO or HO). Cooling system integrity is critical; inspect the radiator, hydraulic oil cooler, charge-air cooler, and A/C condenser for packed debris between heat exchangers. If temperature rises during heavy work but falls at idle, cooling capacity is marginal. Engine overheating during heavy excavation often points to blocked air passages or low coolant. Fuel system diagnosis should start with fuel filters, water separator, and air entry points if the engine cranks but does not start. Source: Komatsu Shop Manual SEBM028318; Heavy Machinery Club Komatsu Excavator Troubleshooting Guide.
What electrical and sensor issues are commonly reported for Komatsu heavy equipment?
Multiple fault codes often indicate battery, ground, or connector issues. A battery may show acceptable voltage until the starter is loaded; perform a load and voltage-drop test before replacing the starter. Check engine and chassis grounds, main starter cable, and starter relay if the engine will not crank. Safety lock or interlock faults can prevent travel or hydraulic function. Electronic control faults may cause sudden derating; verify exact warning codes. Source: Heavy Machinery Club Komatsu Excavator Troubleshooting Guide.
What should be checked when buying a used Komatsu machine with the SA12V140-1U-98 engine?
Verify the exact serial-prefix specification sheet and installed attachment package, as configurations change weight, reach, and fuel use. Check for hydraulic oil condition and temperature behavior (cold vs. hot performance). Inspect undercarriage wear, track tension, and final drive oil levels. Test all hydraulic functions individually and collectively. Verify engine fault codes and battery health under load. Confirm the emissions tier and regional package. Source: Heavy Equipment Specs Directory; Komatsu Shop Manual SEBM028318.
What safety-critical fixes require dealer verification for the SA12V140-1U-98 engine?
Coolant system pressurization issues, especially if coolant is expelled shortly after cold start, require dealer verification to rule out deeper engine failure. Any sudden derating or specific aftertreatment warnings must be diagnosed by a dealer using OEM tools. Final torque specifications for cylinder heads, main bearings, and connecting rods must be verified against the factory spec sheet for the exact serial range. Source: Komatsu Shop Manual SEBM028318; Heavy Machinery Club Komatsu Excavator Troubleshooting Guide.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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