Komatsu D50A-17(S/N 80001-UP)
Komatsubulldozermedium (d40 - d75)

Komatsu D50A-17(S/N 80001-UP)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu D50A-17 is a mid-size crawler dozer designed for heavy earthmoving and construction applications. Produced for serial numbers 80001 and up, this machine is powered by the Komatsu 6D125-1 inline-six engine delivering 124 hp at 1750 rpm. The operating weight ranges from 12,240 kg (26,985 lb) depending on the configuration. It features a direct drive transmission with five forward and four reverse gears. The D50A-17 succeeded the D50A-16 and is part of the broader D50 series lineage, which includes the D50P-17 and D53A-17 variants. Configurations typically include standard blade setups with 39 shoes per side and 18-inch track shoes.

Across the D50 series generations, Komatsu refined the powertrain efficiency and undercarriage durability to meet evolving emissions and productivity standards. The D50A-17 matters in the used and parts market because its 6D125-1 engine and direct drive transmission are robust, long-lasting components with high aftermarket support. The machine's modular design allows for extensive rebuild, making it a cost-effective option for fleet managers seeking reliable mid-tier dozer capacity. Its widespread use in grading and light dozing ensures a steady supply of used units and compatible replacement parts.

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 D50A-17(S/N 80001-UP) specifications

Engine

Model6D125-1
Number of Cylinders6
Displacement673.8 cu in (11041.6 cc)
Gross Power92.5 kW (124 hp)
Power Measured @1750 rpm

Weights

Operating Weight26984.6 lb (12240.0 kg)

Dimensions

Length w/ Blade15.64 ft (4765 mm)
Width Over Tracks7.68 ft (2340 mm)
Height To Top Of Cab9.52 ft (2900 mm)
Length Of Track On Ground7.22 ft (2200 mm)
Ground Clearance1.04 ft (315 mm)
Track Gauge6.17 ft (1880 mm)
Standard Shoe Size18.12 in (460 mm)
Number Of Shoes Per Side39
Number Of Track Rollers Per Side5
Track Pitch175 mm (6.89 in)
Number Of Carrier Rollers Per Side2

Performance

Transmission TypeDD
Number Of Forward Gears5
Number Of Reverse Gears4

Blades

Standard Blade Width12.3 ft (3745 mm)
Standard Blade Height34.5 in (875 mm)

Service Capacities

Fuel Capacity63.5 gal (240.35 L)
Cooling System Fluid Capacity11.1 gal (42.01 L)

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

Komatsu D50A-17(S/N 80001-UP) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level via sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check track tension and shoe/pad condition.
  • Inspect hydraulic hoses for cracks or leaks.
Every 250 h
  • Change engine oil and filter.
  • Grease all pivot points on blade, ripper, and push arms.
  • Check fluid levels across all systems.
  • Inspect air filter restriction indicator.
  • Inspect belts and hoses for wear.
  • Perform visual walk-around inspection.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Test battery and alternator load.
  • Test coolant SCA concentration.
  • Collect KOWA engine oil sample.
  • Perform detailed undercarriage visual inspection.
Every 1,000 h
  • Collect hydraulic oil sample.
  • Change final drive oil on both sides.
  • Inspect turbocharger condition.
  • Measure undercarriage wear components.
  • Check valve adjustment status.
  • Inspect structural welds and frame integrity.
Every 2,000 h
  • Change hydraulic oil.
  • Flush and replace coolant.
  • Service transmission and torque converter.
  • Perform comprehensive component evaluation.
  • Check KDPF status (if applicable).
  • Torque ROPS bolts and cutting edge bolts.

Servicing the D50A-17(S/N 80001-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA oil analysis at every 500-hour interval to monitor engine wear metals and coolant contamination. Check hydraulic oil particle count and viscosity at 1000 hours to detect pump or valve wear early. Monitor coolant SCA levels at 500 hours to prevent liner cavitation in the 6D125-1 engine. Use KOMTRAX telematics to track load frequency and fuel burn, identifying inefficient operating cycles that accelerate fluid degradation. Adjust service intervals based on KOWA results rather than fixed hours if conditions permit.

Corrective & Common Repairs

Address frequent undercarriage wear on the 39-shoe track system by monitoring roller and sprocket clearance. Replace hydraulic return filters promptly to prevent contamination of the pilot control system. Inspect the 6D125-1 engine fuel injection timing if power drops or smoke increases. Check final drive oil for metal shavings indicating gear wear. Repair hydraulic hose leaks at pivot points to maintain blade and ripper responsiveness. Replace worn cutting edges and end bits to maintain blade efficiency and reduce frame stress.

Overhaul & Rebuild Points

Plan major engine overhaul around 10,000-12,000 hours based on compression and oil consumption trends. Rebuild final drives when oil changes reveal excessive gear wear or seal failure. Inspect the direct drive transmission clutch packs at 5,000-hour intervals for slippage. Overhaul the hydraulic pump and control valves if flow rates drop below specification. Replace track chains and sprockets when elongation exceeds limits to prevent derailment. Evaluate the undercarriage frame for cracks near the track rollers and carrier roller mounts.

Seasonal & Environment Servicing

In cold climates, use Komatsu Super Coolant AF-NAC to prevent freezing and ensure proper heat transfer. Check battery hold-down and terminals for corrosion in humid or coastal environments. Grease all pivot points more frequently in dusty conditions to prevent abrasive wear. Inspect air filter elements daily in high-dust areas and replace as needed. Drain fuel water separator more often in humid conditions to prevent microbial growth. Verify track tension in muddy or rocky terrain to prevent excessive wear and improve traction.

D50A-17(S/N 80001-UP) common service parts

Part numberPart
07281-00197Clamp,(With Pre-Fuel Filter)Check fitment →
09019-08035Wrench,Filter (For Add. Fuel Filter)Check fitment →
07000-02135O-Ring,Hydraulic Oil FilterCheck fitment →
09655-00120Plate? Instruction,Hydraulic Oil FilterCheck fitment →
07000-05155O-Ring,Hydraulic Oil FilterCheck fitment →

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

D50A-17(S/N 80001-UP) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify the voltage at the pin connector
CA111Internal engine controller faultECM internal abnormalityReplace or reprogram the ECM
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA441Battery voltage too lowAlternator or battery failure; voltage regulator issueReplace the alternator or battery; check the voltage regulator
AA10NXAir cleaner cloggingBlocked air filter elementReplace the air filter
B@BCNSEngine coolant overheatingRadiator blockage, fan belt failure, or low coolant levelCheck radiator fins, fan belt, and coolant level
E10Engine controller power failureECM power connection loss, blown fuse, or ground wire faultInspect ECM power connections, fuses, or ground wires
CA234Engine overspeedThrottle calibration error, engine load cycle issue, or operator misuseVerify throttle calibration, engine load cycle, or operator misuse
CA122Intake air pressure high voltageIntake pressure sensor malfunction or wiring issueVerify the intake pressure sensor and wiring
CA123Intake air pressure low voltageSensor short or airflow restrictionCheck for a sensor short or an airflow restriction

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

D50A-17(S/N 80001-UP) attachments & work tools

Blades

The standard blade for the D50A-17 (S/N 80001-UP) is a semi-U (SU) type with a width of 3.76 m (12.3 ft) and a height of 0.88 m (34.5 in). Factory spec sheets for this serial range do not document VPAT (Variable Pitch Angle Tilt) availability or specific A-type blade configurations for this exact model.

Rippers

The provided sources do not list specific multi-shank or single-shank ripper options, weights, or capacities for the D50A-17 (S/N 80001-UP). The parts catalog for this serial range lists general work equipment but omits specific ripper model numbers or dimensions.

Winches

The sources do not document towing winch options or class fitment for the D50A-17 (S/N 80001-UP). The parts manual for this serial range does not list winch assemblies or related hydraulic pump specifications for winch operation.

Drawbars/Counterweights

The operating weight is listed as 12,240.0 kg (26,984.6 lb) in factory spec sheets. The sources do not provide specific data on drawbar configurations or optional counterweight weights for this serial range.

Cab/ROPS Guarding

The height to the top of the cab is 2.90 m (9.52 ft). The sources do not document specific forestry or waste configuration guarding options for the D50A-17 (S/N 80001-UP).

Hydraulic Arrangement

The transmission type is direct drive (DD) with 5 forward and 4 reverse gears. The sources do not provide specific details on hydraulic arrangement notes for front or rear tool connections for this serial range.

All D50A-17(S/N 80001-UP) assemblies by section

Every catalogued assembly group for the Komatsu D50A-17(S/N 80001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine Related Parts And Electrical System
Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Battery
01***20Bolt,(With Auto Emergency Steering)2
01***30Bolt,(Not Used With Emergency Str.)4
01***08Nut,(For Canvas Canopy?Head Guard)8
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Battery (Large Capacity)
01***20Bolt,(With Auto Emergency Steering)2
01***30Bolt,(Not Used With Emergency Str.)4
01***08Nut,(For Canvas Canopy?Head Guard)8
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Electrical System
01***16Bolt (With Air Heater & Conditioner)2
01***16Bolt, Battery To Frame Ground Wire Attaching7
01***25Bolt,(For Canvas Canopy?Head Guard)1
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Electrical System (Sandy And Dusty Terrain Spec.) (Except Japan)(#80718-)
01***16Bolt (With Air Heater & Conditioner)2
01***16Bolt, Battery To Frame Ground Wire Attaching5
01***20Bolt,(For Quick Shift) (Mitsubishi)4
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts
01***20Bolt1
01***50Bolt3
01***05Bolt2
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Fuel Control Lever
01***30Bolt,(For Mechanical Governor)1
01***35Bolt,(For Position Fixing)1
01***16Bolt, Battery To Frame Ground Wire Attaching2
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping
01***12Bolt,(With Cylinder Cover)2
01***16Bolt, Battery To Frame Ground Wire Attaching3
01***25Bolt,(For Canvas Canopy?Head Guard)10
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping (With Fuel Strainer) (Except Japan)(#81449-)
01***25Bolt,Without Revolution Sensor2
01***16Bolt, Battery To Frame Ground Wire Attaching3
01***25Bolt,(For Canvas Canopy?Head Guard)10
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Instrument Panel
01***10Bolt,(With Auto Emergency Steering)2
01***16Screw, Mount Parking Lights2
01***20Screw - Turn Signal And Parkinglight Mounting2
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Instrument Panel (Sandy And Dusty Terrain Spec.) (Except Japan)(#80718-81012)
01***10Bolt,(With Auto Emergency Steering)2
01***16Screw, Mount Parking Lights2
01***20Screw - Turn Signal And Parkinglight Mounting2
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Instrument Panel (Sandy And Dusty Terrain Spec.) (Except Japan)(#81013-)
01***16Screw, Mount Parking Lights2
01***20Screw - Turn Signal And Parkinglight Mounting2
01***16Screw8
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Radiator And Piping
01***20Bolt,(For Quick Shift) (Mitsubishi)60
01***30Bolt,(For Quick Shift) (Mitsubishi)4
01***30Bolt,(Not Used With Emergency Str.)2
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Radiator Cover
01***25Bolt,(For Canvas Canopy?Head Guard)21
01***30Bolt,(For Quick Shift) (Mitsubishi)6
01***05Bolt, Mount Hose Clip5
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Komatsu : D50a-17(S/N 80001-Up) : Engine Related Parts And Electrical System : Radiator Cover (For Sandy Dusty Terrain Spec.) (Except Japan)
01***25Bolt,(For Canvas Canopy?Head Guard)27
01***30Bolt,(For Quick Shift) (Mitsubishi)6
01***05Bolt, Mount Hose Clip6
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Guard
Komatsu : D50a-17(S/N 80001-Up) : Guard : Air Creaner Mounting And Connection (For Sandy Dusty Terrain Spec.) (Except Japan)(#80001-80717)
01***75Bolt,(For Adjusting)4
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps4
01***40Bolt,R.H. Outside And L.H. Inside, Bolt4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Air Creaner Mounting And Connection (For Sandy Dusty Terrain Spec.) (Except Japan)(#80718-81012)
01***75Bolt,(For Adjusting)4
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps4
01***40Bolt,R.H. Outside And L.H. Inside, Bolt4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Air Creaner Mounting And Connection (For Sandy Dusty Terrain Spec.) (Except Japan)(#81013-)
01***75Bolt,(For Adjusting)4
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps4
01***40Bolt,R.H. Outside And L.H. Inside, Bolt4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Box And Floor
01***16Bolt,(For Slag Handling)2
01***25Bolt - Rear Guard Mounting12
01***30Bolt,Radio Controlled Slag Handling3
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Canopy
01***35Bolt,(For Pedal Steering)8
01***50Screw4
01***40Bolt,R.H. Outside And L.H. Inside, Bolt8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Drawbar (Lock Type)
01***80Bolt6
01***60Bolt (Itl)1
01***19Nut - M244
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Drawbar (With Angle Lake)
01***90Bolt (Kit)6
01***19Nut - M242
01***60Washer,(Without Rops Guard? Canopy)8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Engine Hood And Extension (For Sandy Dusty Terrain Spec.) (Except Japan)(#80001-81012)
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***40Bolt, Mount Master Brake Cylinder12
01***50Bolt,(With Service Valve R.H.)1
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Engine Hood And Side Cover
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***25Bolt,(Without Rops Guard? Canopy)14
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps3
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Engine Hood And Side Cover (For Sandy Dusty Terrain Spec.) (Except Japan)
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***25Bolt,(Without Rops Guard? Canopy)14
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps3
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Equalizer Bar
01***16Bolt,(Sandy And Dusty Spec.)1
01***35Bolt2
01***55Bolt, Fuel Tank Mounting4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Fender And Rear Cover
01***25Bolt,(Without Rops Guard? Canopy)27
01***30Bolt,(Not Used With Emergency Str.)8
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps2
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Hitch
01***90Bolt (Kit)4
01***60Bolt (Itl)1
01***15Nut,(For Quick Shift) (Mitsubishi)1
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Marks And Plates (For Sandy Dusty Terrain Spec.) (Except Japan)
08***01Indicator,Dust (Japanese And English)1
09***00Plate? Safety,Inspection And Maintenance1
09***35Plate? Name,Machine (Limited Supply)1
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Marks And Plates (Japanese And English)
04***60Screw,Machine Model (For Ec Reg.)4
08***01Indicator,Dust Indicator1
09***00Plate? Safety,Inspection And Maintenance1
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Marks And Plates (Japanese)
04***60Screw,Machine Model (For Ec Reg.)4
08***01Indicator,Dust Indicator1
09***00Plate? Safety,Inspection And Maintenance1
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Operator'S Seat (Fixed Type)(#80001-82152)
01***16Bolt (With Air Heater & Conditioner)4
01***20Bolt,(For Quick Shift) (Mitsubishi)8
01***20Bolt,(Without Rops Guard? Canopy)4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Operator'S Seat (Fixed Type)(#82153-)
01***16Bolt (With Air Heater & Conditioner)4
01***20Bolt,(Without Rops Guard? Canopy)4
01***25Bolt,(Without Rops Guard? Canopy)8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Operator'S Seat(#80001-82152)
01***16Bolt,(For Slag Handling)4
01***20Bolt,(Large Capacity Type) (Std)9
01***20Bolt,(Used When Towing Winch)4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Operator'S Seat(#82153-)
01***16Bolt (With Air Heater & Conditioner)4
01***20Bolt,(For Quick Shift) (Mitsubishi)9
01***20Bolt,(Without Rops Guard? Canopy)4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Radiator Guard And Cylinder Support
01***25Bolt,(Without Rops Guard? Canopy)6
01***30Bolt,(Not Used With Emergency Str.)1
01***60Bolt,(Shim Thickness?More Than 8mm)8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Radiator Guard And Cylinder Support (For Mechanical Angle Power Tilt Dozer)
01***25Bolt,(Without Rops Guard? Canopy)2
01***30Bolt,(Not Used With Emergency Str.)1
01***60Bolt,(Shim Thickness?More Than 8mm)8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Radiator Guard And Cylinder Support (For Sandy Dusty Terrain Spec.) (Except Japan)(#80718-)
01***25Bolt,(Without Rops Guard? Canopy)2
01***30Bolt,(Not Used With Emergency Str.)1
01***60Bolt,(Shim Thickness?More Than 8mm)8
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Seat Suspension (With Oil Damper)(#82153-)
01***10Nut,(Without Air Conditioner)4
01***16Washer,(With Water Separator)2
01***26Washer,Plain4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Swing Drawber
01***50Bolt,(For Large Size Tire)4
01***65Bolt,(Without Rops Guard? Canopy)6
01***30Capscrew4
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Komatsu : D50a-17(S/N 80001-Up) : Guard : Under Guard
01***30Bolt,(Not Used With Emergency Str.)6
01***40Bolt,(With Center Guard)8
01***45Bolt,(For Travel Motor) (Not Show)6
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Main Clutch And Transmission
Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Counter Shaft And Gear
01***25Bolt,(Sandy? Dusty Terrain Spec.)2
01***30Bolt,(For France Noise Suppression)4
01***30Bolt,Radio Controlled Slag Handling2
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Gear Shift Fork
04***25Wire,Lock? Fork Set Bolt7
12***44Fork,1st And 2nd1
12***54Fork,3rd And 4th1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Gear Shift Lever
01***40Bolt,(Dust And Dirt Protection)1
01***20Bolt,(With Auto Emergency Steering)1
01***30Bolt,(For Quick Shift) (Mitsubishi)4
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Inertia Brake
01***25Bolt,(Sandy? Dusty Terrain Spec.)3
01***08Nut, Regular Hexagon (M10-1.50)1
01***08Nut,R.H. Thread1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Intermediate Shaft And Gear
01***25Bolt,(Sandy? Dusty Terrain Spec.)2
01***30Bolt,(For France Noise Suppression)4
01***30Bolt,Radio Controlled Slag Handling2
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch And Steering Pump
01***08Nut,(For Straight Tilt Dozer) (D65p)8
01***30Washer, Spring (Supplied W/Spider Assembly), Washer-Spring8
07***00Pump Ass'Y1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Booster
01***20Bolt,(Sandy? Dusty Terrain Spec.)4
01***25Bolt,(Without Auto Priming System)1
01***30Bolt,(For France Noise Suppression)7
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Housing (1/2)
01***25Bolt,(Sandy? Dusty Terrain Spec.)8
01***40Bolt,(Dust And Dirt Protection)9
01***50Bolt, Radiator To Frame1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Housing (2/2)
01***25Bolt,(Sandy? Dusty Terrain Spec.)12
01***08Nut,R.H. Thread1
01***30Washer,Spring(Sandy?Dusty Terrain S.)12
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Lever
01***30Bolt,(For Mechanical Governor)3
01***80Bolt, Mount Tubes To Switch And Work Pumps1
01***07Nut,L.H. Thread (D31s)1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Oil Piping
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***30Bolt,(For Quick Shift) (Mitsubishi)8
01***55Bolt, Mount Tube To Switch Pump2
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Clutch Plate
01***25Bolt6
01***25Bolt,(Sandy? Dusty Terrain Spec.)4
01***30Bolt,(For France Noise Suppression)7
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Main Shaft And Gear
01***16Bolt (Welded)2
01***22Bolt2
01***25Bolt,(Sandy? Dusty Terrain Spec.)3
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Transmission Case And Filler
01***30Bolt,(For France Noise Suppression)2
01***65Bolt,(For Suction Fan)(4d130-1d)4
01***50Bolt7
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Transmission Case Cover
01***16Bolt, Battery To Frame Ground Wire Attaching1
01***20Bolt,(For Quick Shift) (Mitsubishi)2
01***25Bolt,(For Canvas Canopy?Head Guard)13
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Transmission Control Lever
01***30Bolt,(For Mechanical Governor)1
01***35Bolt,(For Position Fixing)1
01***40Bolt,(With Air Conditioner)1
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Komatsu : D50a-17(S/N 80001-Up) : Main Clutch And Transmission : Universal Joint
01***29Washer,Spring (Cold Weather Spec.)4
01***30Washer,Spring(Sandy?Dusty Terrain S.)8
02***95Bolt4
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Optional Parts
Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Angle Rake Blade
01***55Bolt - Mount Cage To Transmission Case4
01***14Nut4
01***42Washer,Spring (For Pedal Steering)1
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Back-Up Alarm(#80001-82111)
01***30Bolt,(For Quick Shift) (Mitsubishi)2
01***30Bolt,(Not Used With Emergency Str.)2
01***20Screw4
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Back-Up Alarm(#82112-)
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***30Bolt,(For Quick Shift) (Mitsubishi)2
01***65Bolt,(With Canvas Or Rops Canopy)2
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Engine Hood And Side Cover (For Water Separator Mounting)
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***25Bolt,(Without Rops Guard? Canopy)14
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps3
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Head Guard
01***35Bolt, Hydraulic Tank Mounting24
01***45Bolt,(For Travel Motor) (Not Show)8
01***50Bolt,(For Tbg/Abe Spec.)8
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Radiator Shutter
01***20Bolt,(For Quick Shift) (Mitsubishi)4
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***25Bolt,(Without Rops Guard? Canopy)2
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Reinforced Angle Blade
01***55Bolt - Mount Cage To Transmission Case4
01***14Nut4
01***42Washer,Spring (For Pedal Steering), Washer-Spring1
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Reinforced Under Guard
01***30Bolt,(Not Used With Emergency Str.)6
01***50Bolt,(For Tbg/Abe Spec.)14
01***55Bolt,(With Hook)4
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Rops Canopy
01***25Bolt,(Without Rops Guard? Canopy)14
01***30Bolt,(Not Used With Emergency Str.)14
01***36Wahser-Spring, Washer,Spring (Without Towing Winch)14
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Rops Mount
01***30Bolt,(Not Used With Emergency Str.)4
01***40Bolt,(With Center Guard)12
01***20Bolt6
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Snow Plow
01***60Bolt,(Except Pll)2
01***50Bolt,(For Tree Pusher)8
01***15Nut (Op)2
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Under Guard (With Hook)
01***30Bolt,(Not Used With Emergency Str.)6
01***40Bolt,(With Center Guard)8
01***45Bolt,(For Travel Motor) (Not Show)6
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Vandalism Protection
07***00Cap,(For Vandalism Protection)1
07***00Cap, Locking - Hydraulic Tank Oil Filler Cap1
07***00Cap,(For Vandalism Protection)1
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Komatsu : D50a-17(S/N 80001-Up) : Optional Parts : Work Equipment Hose Guard
01***25Bolt,(Without Rops Guard? Canopy)2
01***35Bolt, Mount Ground Driven Steering Pump18
01***36Wahser-Spring, Washer,Spring (Without Towing Winch)20
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Steering System And Final Drive
Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Bevel Gear And Shaft
01***10Bolt, Mount Flasher4
01***35Bolt - Torque Converter Totransmission Mounting6
01***20Bolt4
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Brake Lock Lever
01***25Bolt,(Without Rops Guard? Canopy)9
01***45Bolt, Mounting Bracket To Radiator (Top)2
01***16Screw2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Brake Pedal And Linkage
01***30Bolt,(For Quick Shift) (Mitsubishi)2
01***50Bolt,(For Strengthened Cover)4
01***08Nut,L.H. Thread3
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Control And Relief Valve Piping
01***25Bolt,(For Canvas Canopy?Head Guard)2
01***55Bolt, Mount Tube To Switch Pump2
01***60Bolt, Mount Tube To Switch Pump3
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Final Drive Gear
01***30Bolt,(For Center Guard)16
01***30Bolt,(Not Used With Emergency Str.)12
01***13Nut2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Final Drive Housing And Sprocket
01***25Bolt,(For Canvas Canopy?Head Guard)16
01***75Bolt,(For D65e)8
01***40Capscrew50
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Final Drive Shaft
01***40Bolt,(Not Used With Cab)12
01***70Bolt,Rear Carrier (With Gumpad)24
01***55Bolt,(With Hook)8
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Relief Valve
01***16Bolt (With Air Heater & Conditioner)6
01***30Bolt,(For Quick Shift) (Mitsubishi)2
01***25Washer,Spring?For Additional Rear Lam6
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Brake (1/2)
01***25Bolt,(Sandy? Dusty Terrain Spec.)10
01***25Bolt - Rear Guard Mounting4
01***30Bolt,Radio Controlled Slag Handling12
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Brake (2/2)
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***30Bolt2
01***08Nut, Regular Hexagon (M10-1.50)2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Case And Main Frame
01***16Bolt,(For Slag Handling)2
01***20Bolt,(Large Capacity Type) (Std)2
01***25Bolt,(For Slag Handling)4
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Case And Main Frame (For Sandy Dusty Terrain Spec.) (Except Japan)(#81013-)
01***16Bolt,(For Slag Handling)2
01***20Bolt,(Large Capacity Type) (Std)2
01***25Bolt,(For Slag Handling)4
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Clutch
01***12Screw2
01***10Nut (K10)2
06***17Bearing2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Control Booster
01***20Bolt,(For Quick Shift) (Mitsubishi)4
01***60Bolt, Tube To Oil Cooler4
01***65Bolt, Mount Radiator To Frame (Bottom)2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Control Valve
Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Lever
01***20Bolt,(For Quick Shift) (Mitsubishi)2
01***25Bolt,(Without Rops Guard? Canopy)13
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps10
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Lever (For Sandy Dusty Terrain Spec.) (Except Japan)(#81013-)
01***20Bolt,(For Quick Shift) (Mitsubishi)2
01***25Bolt,(Without Rops Guard? Canopy)13
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps10
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Lever Linkage
01***25Bolt,(Without Rops Guard? Canopy)4
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps2
01***45Bolt, Mounting Bracket To Radiator (Top)2
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Oil Filter
01***30Bolt,(For Quick Shift) (Mitsubishi)4
01***30Washer, Spring (Supplied W/Spider Assembly), Washer-Spring4
07***10O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-020101
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Oil Piping (1/2)
01***25Bolt,(For Canvas Canopy?Head Guard)6
01***30Bolt,(For Quick Shift) (Mitsubishi)6
01***45Bolt,(For Power Tilt Mech Angle)3
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Komatsu : D50a-17(S/N 80001-Up) : Steering System And Final Drive : Steering Oil Piping (2/2)
01***30Bolt,(For Quick Shift) (Mitsubishi)10
01***35Bolt,(For Quick Shift) (Mitsubishi)2
01***55Bolt, Mount Tube To Switch Pump2
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Tool And Kit
Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Body Sheet
Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Cap And Overall
09***50Overall,(Special Order)1
09***50Cap And Overall Kit,(Except Japan)1
09***50Cap And Overall Kit1
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Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Service Kit
01***30Bolt1
01***30Washer, Spring (Supplied W/Spider Assembly), Washer-Spring1
01***16Washer,(With Water Separator)1
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Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Spare Parts (Except Japan)
07***75O-Ring,Steering Oil Filter1
07***80O-Ring,Hydraulic Oil Filter1
07***32O-Ring,Drain Plug? Main Clutch1
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Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Tool (Except Japan)
07***50Pump, (Bellows Type)1
07***03Cartridge - Grease1
07***45Nozzle, Grease Pump (Non-Flexible Type)1
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Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Tool (Except Japan) (For China)
Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Tool (For Reversible Fan)
Komatsu : D50a-17(S/N 80001-Up) : Tool And Kit : Tool (For Sandy Dusty Terrain Spec.) (Except Japan)
07***50Pump, (Bellows Type)1
07***03Cartridge - Grease1
07***45Nozzle, Grease Pump (Non-Flexible Type)1
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Track
Komatsu : D50a-17(S/N 80001-Up) : Track : Carrier Roller
01***20Bolt,(For Mono Lever Steering)2
01***25Bolt,(For Canvas Canopy?Head Guard)3
01***45Bolt,(For 60ton Dump Body)16
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Komatsu : D50a-17(S/N 80001-Up) : Track : Front Idler
01***25Bolt,(For Canvas Canopy?Head Guard)12
01***40Bolt,(For Slag Handling) (For Usa)4
01***60Capscrew4
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Komatsu : D50a-17(S/N 80001-Up) : Track : Recoil Spring
01***35Bolt - Torque Converter Totransmission Mounting12
01***45Bolt,(For Slag Handling)12
01***16Bolt, Battery To Frame Ground Wire Attaching2
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Komatsu : D50a-17(S/N 80001-Up) : Track : Recoil Spring (For Reinforce)
01***35Bolt - Torque Converter Totransmission Mounting12
01***45Bolt,(For Slag Handling)12
01***16Bolt, Battery To Frame Ground Wire Attaching2
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Frame
01***50Screw2
01***25Bolt,(Without Rops Guard? Canopy)8
01***30Bolt-Hex, Bolt,(With Center Guard)32
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Roller(#80001-82480)
01***25Bolt,(Sandy? Dusty Terrain Spec.)12
01***65Bolt - Battery Box40
01***30Washer,Spring(Sandy?Dusty Terrain S.)12
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Roller(#82481-)
01***65Capscrew - M16 X 2.00 X 9040
01***45Washer,(For Travel Motor) (Not Show)40
07***55O-Ring,Front Accessory Drive2
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Shoe (Lubricate Type)(#80001-82152)
01***22Nut? Shoe (Kit)296
07***30Plug,(Large)78
07***21Plug,(Small)78
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Shoe (Lubricate Type)(#82153-)
07***30Plug,(Large)78
07***21Plug,(Small)78
13***17Track Shoe Ass'Y1
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Komatsu : D50a-17(S/N 80001-Up) : Track : Track Shoe (Master Pin Type)(#80001-82152)
01***22Nut? Shoe (Kit)312
13***03Track Shoe Ass'Y1
13***04Track Shoe Ass'Y1
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Work Equipment
Komatsu : D50a-17(S/N 80001-Up) : Work Equipment : Angle Blade
01***55Bolt - Mount Cage To Transmission Case4
01***14Nut4
02***70Bolt, Plow26
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment : C-Frame
01***80Bolt, Mount Strainer Flange2
01***45Bolt16
01***45Screw2
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment : Hydraulic Piping (Tilt Cylinder Line) (Dozer Side) (For Straight Tilt Dozer)
01***25Bolt,(Without Rops Guard? Canopy)11
01***30Bolt,(Not Used When Towing Winch)10
01***36Wahser-Spring, Washer,Spring (Without Towing Winch)21
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment : Straight Blade
01***80Bolt,(With Corrosion Resistor)2
01***65Bolt,(Used With Pin Puller)4
01***35Capscrew - M14 (1)/(2)4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment : Straight Frame
01***45Bolt16
01***40Screw2
01***60Flat Washer - M20 (Hardened)16
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Work Equipment Control System
Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Blade Control Lever
01***55Bolt1
01***16Bolt (With Air Heater & Conditioner)2
01***20Bolt,(With Auto Emergency Steering)4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Blade Lift Cylinder
01***20Bolt,(Sandy? Dusty Terrain Spec.)2
01***35Bolt,(Without Auto Priming System)4
01***50Bolt,(For Trimming Dozer)4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Blade Tilt Cylinder (For Straight Tilt Dozer)
01***20Bolt,(With Auto Emergency Steering)1
01***50Bolt,(For Tbg/Abe Spec.)2
01***75Bolt4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Control Valve (1/2)
01***30Bolt,(For France Noise Suppression)2
01***35Bolt - Torque Converter Totransmission Mounting2
01***40Bolt,(Dust And Dirt Protection)2
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Control Valve (2/2)
01***35Bolt, Mounting - Flywheel Housing End3
01***70Bolt, Spacer2
01***75Bolt,(For D57sr)2
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Piping (Tank To Lift Cylinder) (#80001-81914)(#80001-81914)
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***30Bolt,(For Quick Shift) (Mitsubishi)6
01***45Bolt,(For Power Tilt Mech Angle)8
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Piping (Tank To Lift Cylinder) (#81915-)(#81915-)
01***25Bolt,(For Canvas Canopy?Head Guard)4
01***30Bolt,(For Quick Shift) (Mitsubishi)6
01***45Bolt,(For Power Tilt Mech Angle)4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Piping? Pump To Tank
01***20Bolt,(For Quick Shift) (Mitsubishi)2
01***45Bolt,(For Power Tilt Mech Angle)4
01***60Bolt, Mount Tube To Switch Pump4
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Pump
04***18Ring,Snap (Itl)1
07***62Seal,Oil (Itl)1
70***00Pump Ass'Y (Kar80)1
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Tank (1/2)
01***20Bolt,(Large Capacity Type) (Std)2
01***25Bolt,(Sandy? Dusty Terrain Spec.)53
01***40Bolt,(Not Used With Cab)5
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Komatsu : D50a-17(S/N 80001-Up) : Work Equipment Control System : Hydraulic Tank (2/2)
01***30Bolt,(Cold Terrain Spec.)1
01***25Bolt,(Sandy? Dusty Terrain Spec.)16
01***30Bolt,(For France Noise Suppression)5
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D50A-17(S/N 80001-UP) serial number reference

The PIN plate is located on the front frame casting, typically on the operator's left side near the radiator support. Read the prefix as the first three characters of the 17-character ISO PIN stamped on the emissions/export plate.

PrefixIdentifies
80001-UPD50A-17

Frequently asked questions

What engine does the Komatsu D50A-17 use?

The Komatsu D50A-17 uses the Komatsu 6D125-1 inline-six diesel engine.

What is the operating weight of the Komatsu D50A-17?

The operating weight is approximately 12,240 kg (26,985 lb), varying by configuration.

What model replaced the Komatsu D50A-17?

The Komatsu D50A-18 succeeded the D50A-17 in the D50 series lineup.

What D50A-17(S/N 80001-UP) owners discuss

What is the engine model and gross power output for the Komatsu D50A-17(S/N 80001-UP)?
The machine uses the 6D125-1 engine. Gross power is 92 kW (124 hp) measured at 1750 rpm. Displacement is 11,042 cu cm (674 cu in) with 6 cylinders. Powertrain and hydraulic behaviors vary by configuration/series.
What are the typical undercarriage wear patterns and component counts for this series?
Standard configuration includes 39 shoes per side, 5 track rollers per side, and 2 carrier rollers per side. Track pitch is 7 in (18 cm) and standard shoe size is 18 in (46 cm). Track gauge is 6.6 ft (2 m). Track tension and undercarriage wear are critical diagnostic points; worn bushings lead to noise and vibration.
What are the common hydraulic behaviors and failure modes reported for this machine type?
Hydraulic weakness when hot indicates internal leakage in pumps, main control valves, or cylinders due to viscosity loss. Shared hydraulic supply issues cause all functions to slow simultaneously. One-sided travel weakness points to that specific travel motor or final drive. The line is designed to wear out complete machines; if a pump fails, the engine may be near end-of-life.
What electrical or sensor issues are common in Komatsu machines of this era?
Electronic control systems are sensitive to unstable power supplies and faulty sensors, which can trigger multiple warning signals, intermittent starting, or random shutdowns. Display monitor failures are common; verify power wire voltage (approx. 24 volts) at the fuse box before replacing the monitor. Engine fault codes should be checked for power loss or derating.
What specific items must be checked when buying a used D50A-17(S/N 80001-UP)?
Verify the exact serial prefix against the factory spec sheet. Check the engine oil, hydraulic oil, and coolant levels and condition. Inspect the radiator, hydraulic oil cooler, and charge-air cooler for packed debris. Test travel speed on both tracks in forward and reverse. Check for hydraulic leaks and monitor dashboard warning signals. Parts availability varies by region; confirm access to service manuals and filters.
What are the operating weight and dimensions for the D50A-17(S/N 80001-UP)?
Operating weight is 12,240 kg (26,985 lbs). Length with blade is 5 m (16 ft). Width over tracks is 2 m (6.6 ft). Height to top of cab is 3 m (10 ft). Ground clearance is 0 m (0 ft). Length of track on ground is 2 m (6.6 ft). Dimensions vary by configuration/series.
What safety-critical verification is required for fuel injection timing adjustments?
When installing a fuel injection pump, check and adjust timing by placing the fuel control lever in the NO INJECTION position, cranking the engine, and reading the stabilized pressure. Have your dealer verify.

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

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