Komatsuhydraulic shovels(no series)

Komatsu H185S-1(S/N G06128)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu H185S-1 is a large hydraulic mining shovel designed for high-production overburden removal and loading applications. The machine utilizes a Komatsu diesel engine, with specific power output reaching 485 kW (651 HP) at 1,800 rpm for larger variants in the series. Operating weights for the H185S series range from 106,700 kg to 109,500 kg depending on the specific configuration and bucket size. Production of the H185S-1 series occurred during the transition period of Komatsu's hydraulic shovel lineup, serving as a successor to earlier H-series models and preceding the modern PC-series mining excavators. Configurations offered include backhoe and loading shovel setups, with bucket capacities varying from 3.4 m³ to 6.7 m³ for backhoe operations and up to 6.5 m³ for shovel configurations.

Across the H185S series generations, Komatsu implemented significant updates to hydraulic pump and valve combinations to improve fuel efficiency and operational smoothness. The H185S-1 generation is critical in the used and parts market because it represents a mature platform where component wear patterns are well-documented, yet original equipment is becoming scarce. The machine's heavy-duty undercarriage and cylinder assemblies are frequently rebuilt by aftermarket specialists, driving demand for specific wear parts. Its relevance today stems from its continued use in mining environments where reliability is paramount, and the availability of specialized cylinder repair services and undercarriage components ensures its extended lifecycle despite the introduction of newer, larger mining excavators.

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 H185S-1(S/N G06128) specifications

Engine

ModelNot documented for this exact serial range — verify with your dealer
Gross/Net PowerNot documented for this exact serial range — verify with your dealer
DisplacementNot documented for this exact serial range — verify with your dealer
CylindersNot documented for this exact serial range — verify with your dealer
Emissions TierNot documented for this exact serial range — verify with your dealer

Weights

Operating WeightNot documented for this exact serial range — verify with your dealer
Shipping WeightNot documented for this exact serial range — verify with your dealer
Ground PressureNot documented for this exact serial range — verify with your dealer

Dimensions

Transport LengthNot documented for this exact serial range — verify with your dealer
Transport WidthNot documented for this exact serial range — verify with your dealer
Transport HeightNot documented for this exact serial range — verify with your dealer
Track GaugeNot documented for this exact serial range — verify with your dealer
Ground ClearanceNot documented for this exact serial range — verify with your dealer

Performance

Travel SpeedNot documented for this exact serial range — verify with your dealer
Dig DepthNot documented for this exact serial range — verify with your dealer
GradeabilityNot documented for this exact serial range — verify with your dealer

Service Capacities (Summary)

Fuel TankNot documented for this exact serial range — verify with your dealer
Hydraulic SystemNot documented for this exact serial range — verify with your dealer
Engine OilNot documented for this exact serial range — verify with your dealer
Cooling SystemNot 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 H185S-1(S/N G06128) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level at sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check DEF level on Tier 4 machines.
  • Check air filter restriction indicator.
Every 250 h
  • Change engine oil and filter.
  • Grease all points on boom, stick, bucket, and swing bearing.
  • Check hydraulic hose condition for cracks or leaks.
  • Inspect pins, bushings, and attachment points.
  • Clear debris from radiator and oil cooler fins.
  • Check track tension and shoe/pad condition.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Perform battery load test and clean terminals.
  • Test coolant SCA concentration.
  • Collect KOWA hydraulic oil sample.
  • Perform visual undercarriage wear inspection.
Every 1,000 h
  • Replace air filter outer element.
  • Change final drive oil on both sides.
  • Check and adjust swing machinery oil.
  • Inspect turbocharger condition.
  • Measure undercarriage wear components.
  • Inspect structural boom and stick welds.
Every 2,000 h
  • Change hydraulic system oil.
  • Flush and replace coolant.
  • Replace worn belts, hoses, and clamps.
  • Perform comprehensive structural inspection.
  • Check KDPF condition (if applicable).
  • Inspect and service transmission components.

Servicing the H185S-1(S/N G06128) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic oil particle counts. Track hydraulic viscosity changes and water content to prevent pump cavitation. Monitor coolant pH and SCA concentration levels to protect the engine block and radiator from corrosion. Analyze final drive oil for gear wear indicators. Use KOMTRAX telematics to track load frequency and fault codes, allowing for proactive intervention before component failure occurs during high-stress mining cycles.

Corrective & Common Repairs

Address frequent hydraulic hose failures by inspecting for abrasion near the boom and stick joints. Replace worn cylinder seals on the boom, stick, and bucket to prevent external leaks and pressure loss. Repair or replace damaged track shoes and sprockets to maintain proper tension and reduce undercarriage stress. Fix intermittent electrical faults caused by corroded connectors in the ECM or sensor circuits. Replace worn swing bearing components to eliminate excessive play and noise during rotation.

Overhaul & Rebuild Points

Rebuild the main hydraulic pump and control valves when flow rates drop below specification or internal leakage increases. Overhaul the swing machinery when bearing clearance exceeds limits or gear teeth show pitting. Rebuild the final drives when oil contamination levels rise despite changes or torque output decreases. Replace the engine injectors and turbocharger components when power output falls below 485 kW (651 HP) or fuel consumption increases significantly. Rebuild the undercarriage when roller and idler wear limits are reached to prevent track derailment.

Seasonal & Environment Servicing

In cold climates, verify DEF fluid levels and ensure the heating system functions to prevent crystallization. Use low-temperature hydraulic oil to maintain pump viscosity during startup. In dusty environments, clean the air filter outer element more frequently and check the restriction indicator often. Inspect the radiator and oil cooler fins for debris buildup that restricts airflow. Protect hydraulic lines from extreme cold by ensuring proper insulation and using compatible seals. Monitor coolant glycol content to prevent freezing in the cooling system.

H185S-1(S/N G06128) common service parts

Part numberPart
693 587Fuel Filter Cartridge With SeparatorCheck fitment →
694 402Element, Generator Set Air Conditioning Equipment Pilot Oil PumpCheck fitment →
692 306By-Pass - Oil Filter Cartridge, Diesel EngineCheck fitment →
988 779Oil Filter Cartridge, Diesel EngineCheck fitment →
358 601 40Return Oil Filter, AssemblyCheck fitment →

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

H185S-1(S/N G06128) 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
CA441Battery voltage too lowWeak battery or charging system failureReplace the battery or alternator and check the voltage regulator
CA442Battery voltage too highFaulty voltage regulator or alternatorReplace the alternator or battery and check the voltage regulator
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
AA10NXAir cleaner cloggingDirty or blocked air filter elementReplace the air filter
B@HANSHydraulic oil overheatingContaminated oil, clogged filter, or cooler fan failureChange hydraulic filter and oil and check the cooler fan
B@BCNSEngine coolant overheatingLow coolant level, blocked radiator fins, or fan belt issueCheck radiator fins, fan belt, and coolant level
E10Engine controller power failureECM power connection issue, 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 and engine load cycle
CA111Internal engine controller faultECM internal hardware failureReplace or reprogram the ECM

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

H185S-1(S/N G06128) attachments & work tools

Loading Shovels

The H185S-1 is a large mining hydraulic shovel designed for high-production loading. Factory configurations typically include a heavy-duty boom and stick assembly optimized for digging and loading overburden or ore into haul trucks.

Bucket / Work Tool

Standard loading shovel buckets for this class typically range from 15 to 25 cubic meters (19.6 to 32.8 cubic yards). The bucket is mounted via a proprietary Komatsu quick-coupler or pin-on system, requiring specific hydraulic lines for latch operation.

Backhoe / Digging Configurations

While primarily a shovel, the H185S-1 series supports backhoe configurations for specific mining or heavy excavation tasks. These setups utilize a different boom and stick arrangement and require a dedicated hydraulic kit for swing and stick control.

Hydraulic Kits & Couplers

Attachment compatibility relies on factory-installed hydraulic couplers and quick-connect kits. Specific hydraulic flow rates and pressure settings must match the tool requirements; variations exist by configuration/series depending on the specific boom and stick geometry.

Engine & Powertrain

The H185S-1(S/N G06128) utilizes a Komatsu diesel engine. Specific engine model and horsepower ratings vary by configuration/series and regional emissions requirements; verify the exact engine designation on the machine's data plate or in the operation and maintenance manual.

Undercarriage & Track Shoes

Komatsu hydraulic shovels of this size class use heavy-duty track shoes designed for mining environments. Boundary Equipment and other suppliers offer replacement top rollers and track shoes optimized for the H185S-1 series to improve reliability in challenging conditions.

Cylinder & Component Upgrades

Aftermarket suppliers like Bridge Machine offer improved clam, bucket, stick, and boom cylinders for Komatsu hydraulic shovels. These components are designed to resolve common failure patterns and extend service life in high-stress mining applications.

All H185S-1(S/N G06128) assemblies by section

Every catalogued assembly group for the Komatsu H185S-1(S/N G06128). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

* = Variations From Page:
Komatsu : H185s-1(S/N G06128) : * = Variations From Page :
Komatsu : H185s-1(S/N G06128) : * = Variations From Page : : Accumulator
00***98Test Socket2
15***40Test - Screw Coupling2
21***99Pipe ? 20x75 Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : * = Variations From Page : : Aux. Grating For Fuel Tank
27***40Grating 420x16501
27***40Grating1
30***99Bolt1
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Komatsu : H185s-1(S/N G06128) : * = Variations From Page : : Bullclam Bucket Wear Package
00***98Grease Nipple2
00***98Half Flange16
00***98Half Flange2
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Komatsu : H185s-1(S/N G06128) : * = Variations From Page : : Diaphragm-Type Accumulator
00***98Test Socket2
15***40Test - Screw Coupling2
21***99Pipe ? 20x75 Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : * = Variations From Page : : Generator
51***40Generator 24 V / 100 A1
63***40Diesel Engine Assembly1
69***73Seal Ring4
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Air Condit. System, Heater
Komatsu : H185s-1(S/N G06128) : Air Condit. System, Heater : -Heater
46***40Heat Exchanger1
51***40Heater Consist. Of Fig-Nos: 02-081
69***73Tab 4-Pole1
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Komatsu : H185s-1(S/N G06128) : Air Condit. System, Heater : Cab Heater Arr.
14***40Vent Valve From 061232
25***40Breather Up To 06 1223
25***40Hose Fittings 90?1
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Komatsu : H185s-1(S/N G06128) : Air Condit. System, Heater : Compressor Drive, Air Conditioning
03***99V-Belt - Set1
25***40Solenoid Clutch1
29***40Console1
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Annex
Komatsu : H185s-1(S/N G06128) : Annex : Colour Basic Machine :
Komatsu : H185s-1(S/N G06128) : Annex : Display Schematic :
Komatsu : H185s-1(S/N G06128) : Annex : Electric Schematics :
Komatsu : H185s-1(S/N G06128) : Annex : Hydraulic Schematics :
Komatsu : H185s-1(S/N G06128) : Annex : Tools And Accessories
Bullclam Bucket Equipment
Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Basic Boom 5,5 M
00***98Mounting Clip6
00***98Mounting Clip8
00***98Mounting Clip9
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Basic Boom Cylinder
26***40Connecting Block1
30***99Cover Plate6
31***99Bolt8
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Bucket Cylinder
00***98O-Ring1
21***99Pipe ? 10x270 Lg. Bulk Ware, State Length Required1
26***40Connecting Block1
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Bullclam Bucket
00***98Grease Nipple2
00***98Half Flange16
00***98Half Flange2
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Bullclam Bucket Stick 4,3 M
00***98O-Ring12
30***99Bolt Pin Lock From S/No: 06 12012
30***99Cover Plate24
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Hydr. Cylinder
00***98O-Ring1
00***98Grease Nipple3
20***40O-Ring1
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Komatsu : H185s-1(S/N G06128) : Bullclam Bucket Equipment : Stick Cylinder
00***98O-Ring1
30***40Connecting Block1
30***99Cover Plate2
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Drive
Komatsu : H185s-1(S/N G06128) : Drive
Komatsu : H185s-1(S/N G06128) : Drive : -Air Cleaner
33***99Nut20
34***99Washer20
34***99Lock Washer20
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Komatsu : H185s-1(S/N G06128) : Drive : -Coupling
30***99Bolt10
30***99Screw26
34***99Dowel Sleeve24
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Komatsu : H185s-1(S/N G06128) : Drive : -Diesel Engine
Komatsu : H185s-1(S/N G06128) : Drive : -Double Pump
46***40Double Pump Assembly1
69***81Roller Bearing4
69***73Seal Kit, Front Pump Fig-Nos: 03,05,07,081
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Komatsu : H185s-1(S/N G06128) : Drive : -Engine Control Unit
46***40Rubber Block Support, Engine Monitor4
50***98Nut8
69***53Hose Nw 5 Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : Drive : -Hydr. Pump
17***40Screw Plug2
17***40Union3
18***40O-Ring2
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Komatsu : H185s-1(S/N G06128) : Drive : -Pump
18***40Shaft Seal No Field Repair Item1
31***99Screw7
31***99Socket Head Cap Srew1
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Komatsu : H185s-1(S/N G06128) : Drive : -Pump Distributor Gear
00***98O-Ring1
08***54O-Ring2
08***21O-Ring2
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Komatsu : H185s-1(S/N G06128) : Drive : -Radiator
21***99Radiator Hose ? 12 Bulk Ware, State Length Required2
21***99Radiator Hose ? 50 Bulk Ware, State Length Required10
30***99Bolt24
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Komatsu : H185s-1(S/N G06128) : Drive : Air Cleaning System
14***40Maintenance Switch2
22***40Accordion Hose1
22***40Accordion Hose2
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Komatsu : H185s-1(S/N G06128) : Drive : Cold Start System
28***40Bracket1
30***99Screw4
33***99Nut4
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Komatsu : H185s-1(S/N G06128) : Drive : Engine Assy.
00***98Bolt16
24***40Rail (Cold Weather Design)4
26***40Rail (Cold Weather Design)2
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Komatsu : H185s-1(S/N G06128) : Drive : Engine : Cummins-Diesel
Komatsu : H185s-1(S/N G06128) : Drive : Exhaust System
30***99Bolt2
30***99Bolt8
30***99Bolt 35 Lg16
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Komatsu : H185s-1(S/N G06128) : Drive : Fan Drive
00***98Locking Plate1
26***40Washer, Up To 06 1081
26***40Spacer Block1
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Komatsu : H185s-1(S/N G06128) : Drive : Fuel Lines
25***40Hose Dn 12 X Ca. 4000 Lg. Bulk Ware, State Length Required0
25***40Socket, From S/No: 06 0851
25***40Screwed Fittings1
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Komatsu : H185s-1(S/N G06128) : Drive : Fuel Tank
08***40Quick Disconnect Coupling1
08***40Protection Cap1
17***40Screw Plug1
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Komatsu : H185s-1(S/N G06128) : Drive : Generator Arr.
00***98Bolt1
50***98Bolt1
50***40Bushing1
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Komatsu : H185s-1(S/N G06128) : Drive : Output :
Komatsu : H185s-1(S/N G06128) : Drive : Pump With Pump Distributor Gear Arr.
08***40Quick Disconnect Coupling1
08***40Protection Cap1
30***99Bolt2
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Komatsu : H185s-1(S/N G06128) : Drive : Radiator Arr.
00***98Clamp4
00***98Union1
08***40Quick Disconnect Coupling1
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Komatsu : H185s-1(S/N G06128) : Drive : Serial-No. :
Komatsu : H185s-1(S/N G06128) : Drive : Series :
Komatsu : H185s-1(S/N G06128) : Drive : Type :
Electric
Komatsu : H185s-1(S/N G06128) : Electric
Komatsu : H185s-1(S/N G06128) : Electric : Batteries With Cables
05***40Rubber Grommet4
14***40Cable Shoe16
15***40Battery Switch2
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Komatsu : H185s-1(S/N G06128) : Electric : Horn, Illumination
25***40Compressor-Single Ton-Horn Consist. Of Fig.-No: 03-051
27***40Compressor-Two Ton-Horn Consist. Of Fig.-No: 05-081
30***99Bolt 20 mm Lg4
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Komatsu : H185s-1(S/N G06128) : Electric : Standard Lighting Equipment
00***98Clamp 15/15100
05***40Plug To Fig-No: 175
05***40Socket 2-Polig3
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General View
Komatsu : H185s-1(S/N G06128) : General View : General View Bullclam Bucket Equipment
Komatsu : H185s-1(S/N G06128) : General View : General View Undercarriage
Komatsu : H185s-1(S/N G06128) : General View : Machine-Maintenance Parts
26***40Drive Belt, Fan - Radiator1
50***98Adhesive Lubrication Spray0
69***08Flat Belt (Generator)1
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Hydraulic
Komatsu : H185s-1(S/N G06128) : Hydraulic : --Pressure Relief Valve
10***65O-Ring1
32***40Pressure Relief Valve, Assembly. Without Pressure Adjustment1
50***98O-Ring1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : --Regulating Valve
31***99Screw1
34***99Circlip1
34***99Lock Washer1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : --Throttle Check Valve
00***98O-Ring2
18***40O-Ring1
31***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Aeration Filter
33***99Nut1
44***40Aeration Filter, Assembly1
69***89Socket Housing1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Anticavitation Valve
00***98O-Ring1
13***40O-Ring1
46***40Anticavitation Valve Assembly1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Control Block
16***40Release Valve3
31***99Eye Bolt2
31***99Bolt24
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Control Plate
00***98Plug3
26***40Union6
31***99Plug3
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Control Valve, Load Limit
25***40Control Valve, Load Limit Assembly. 30 Bar1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Filter
59***40Hydraulic. Filter, Assembly1
60***40Plug1
60***40Seal1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -H.P. Filter
31***99Screw4
34***99Lock Washer4
34***40Gasket1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Hydr. Motor
31***99Screw2
31***99Screw4
32***40Hydraulic.-Motor, Assembly1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Pressure Relief Valve
31***99Plug1
31***99Eyebolt2
31***99Screw2
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Pressure Sequence Stage
10***65O-Ring1
49***40Pressure Sequence Stage Assembly1
50***98O-Ring1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Return Oil Filter
10***65O-Ring1
33***99Nut2
33***99Nut1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Slew-Brake Valve
00***98O-Ring2
25***40Valve Disk4
25***40Compression Spring4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : -Valve Block
15***40Test - Screw Coupling1
25***40Screw Plug2
31***99Plug1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Arr. Control Blocks And Manifold (Bullclam Bucket)
15***40Test - Screw Coupling6
30***99Bolt (Standard)6
30***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Control Blocks - Manifold
30***99Screw4
30***99Bolt4
31***99Bolt (Standard)96
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Control Plate
00***98Test Coupling5
00***98Test Coupling1
00***98Union4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Header (Return)
00***98Half Flange12
00***98Flange Seal6
17***40Screw Plug2
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Lines And Valves For Oil Cooler
00***98Half Flange2
00***98Union1
30***99Screw4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Lines :
Komatsu : H185s-1(S/N G06128) : Hydraulic : Main Oil Tank
00***98O-Ring5
00***98O-Ring4
00***98Union2
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Manifold
31***99Socket Head Cap Screw64
33***99Nut28
35***40Flange Seal30
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Manifold (Bullclam Bucket)
00***98Union4
15***99Test Socket5
21***99Pipe ? 10x270 Lg. Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Oil Cooler Arr.
Komatsu : H185s-1(S/N G06128) : Hydraulic : Pressure Line - Pilot Oil Pump And Load-Sensing
31***99Screw18
34***99Lock Washer18
37***99Olive3
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Pump Control
00***98Socket4
15***40Test - Screw Coupling1
18***40Screw Plug2
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Pump Lubrication
00***98Half Flange2
00***98Union1
31***99Screw4
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Pumps - Control Blocks
15***40Test - Screw Coupling3
30***99Bolt2
30***99Bolt6
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Rotary Joint
00***98Socket1
30***99Screw8
30***99Bolt8
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Slew Gear
00***98Union1
15***40Test - Screw Coupling6
30***99Screw2
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Suction Lines
00***98O-Ring1
00***98Half Flange2
00***98Flange Seal1
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Suction Tank
08***40Quick Disconnect Coupling1
08***40Protection Cap1
30***99Screw8
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Komatsu : H185s-1(S/N G06128) : Hydraulic : Valves For Control Blocks
00***98Test Coupling1
00***98Union18
21***99Pipe ? 12 Ca 300mm Bulk Ware, State Length Required0
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Lubrication- And Refueling Equipment
Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : -Metering Valve
26***40Metering Valve, Assembly1
26***40Metering Valve, Assembly1
27***40Metering Valve, Assembly1
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Boom - Lube Lines Bullclam
00***98Clamp 15/1540
00***98Union12
17***40Cable Strap50
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Central Lubrication-Bullclam
00***98Clamp 10/156
00***98Union6
14***40Clamp 20/156
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Electr. Parts
00***98Clamp 15/155
04***40Dust Cap1
04***40Plug3
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Gear Greasing By Pinion Arr.
21***99Pipe ? 12 Ca 300mm Bulk Ware, State Length Required0
30***99Bolt4
30***99Screw1
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Greases
27***40Grease T3 Hs -40/-10? C / 50 Kg1
32***40Grease T2 Hs -20/+10? C /50 Kg1
50***98Adhesive Lubrication Spray1
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Hand Operated Lube Arr.
00***98Grease Nipple34
00***98Union34
15***40Clamping Ring68
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Lube Distributor Slew Ring
21***99Pipe ? 12 Ca 300mm Bulk Ware, State Length Required0
30***99Bolt4
30***99Screw14
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Refueling Equipment
08***40Counter Part To Fig-No. 201
25***40Housing, Empty1
25***40Hose Nw 20x Ca. 1500 mm Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : Lubrication- And Refueling Equipment : Stick - Lube Lines Bullclam
00***98Clamp 15/1512
00***98Clamp 18/153
21***99Pipe ? 12 Ca 300mm Bulk Ware, State Length Required0
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Operator'S Cab
Komatsu : H185s-1(S/N G06128) : Operator'S Cab : -Operator'S Cab
00***98Es-Pin2
00***98Es-Pin1
05***40Grommet2
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : -Operator'S Seat
30***99Bolt 20 mm Lg2
30***99Bolt2
30***99Bolt1
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Add. Parts Protection Roof For Air Conditioning System
30***99Bolt 25 mm Lg2
30***99Bolt4
31***99Screw M8 X 502
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Cab Support
25***40Hv-Washer8
26***40Air Cleaner, Cabin Supercharger3
29***40Gill Breather1
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Cabin Supercharger
30***99Bolt3
32***40Rubber Cord 500 Lg. Bulk Ware, State Length Required0
32***40H.P. Blower1
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Colour :
Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Glazing
08***40Clamping Section 2800 Lg. (To Fig-Nos. 02,04) Bulk Ware, State Length Required0
08***40Filler Section 3000 Lg. Bulk Ware, State Length Required0
30***40Rear Window 803x4581
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Operation Panel
05***40Tab To Fig-No: 43 1,5 - 2,50
05***40Grommet8
05***40Grommet1
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Operator'S Cab Arr.
08***40Mirror2
11***40Mirror Bracket, R.H1
16***40Profiled Joint Ca. 6000 Lg. Bulk Ware, State Length Required1
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Operator'S Stand
05***40Grommet1
30***99Bolt2
30***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Protection Roof
30***99Screw8
30***99Bolt Standard4
31***99Washer4
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Komatsu : H185s-1(S/N G06128) : Operator'S Cab : Windscreen Washing Assy.
05***40Wiper Motor 120?1
19***40Diaphragm Pump1
19***40Water Reservoir1
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Slew Ring
Komatsu : H185s-1(S/N G06128) : Slew Ring : --Brake
31***99Screw Plug8
34***99Seal Ring8
34***99Circlip1
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Komatsu : H185s-1(S/N G06128) : Slew Ring : -Hydr. Motor
25***40Plug1
31***99Screw M8 X 2014
31***99Bolt8
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Komatsu : H185s-1(S/N G06128) : Slew Ring : -Slew Gear
21***99Precision Tubing 10x1.5 Bulk Ware, State Length Required0
21***99Precision Tubing 18x1,5, Lg 0,13 M Bulk Ware, State Length Required0
30***99Bolt2
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Komatsu : H185s-1(S/N G06128) : Slew Ring : Slew Ring And Slew Gear Box
00***98Grease Nipple32
08***40Quick Disconnect Coupling1
08***40Protection Cap1
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Komatsu : H185s-1(S/N G06128) : Slew Ring : Arr.
Superstructure
Komatsu : H185s-1(S/N G06128) : Superstructure : Aux. Catwalk
27***40Platform3
31***40Grid 40x480x5404
31***40Wing Nut, Plastic50
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Komatsu : H185s-1(S/N G06128) : Superstructure : Covering, Engine Housing
08***40Silent Block1
30***99Screw4
30***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Superstructure : Fire Wall
26***40Cellular Rubber 10x130x250 Bulk Ware, State Length Required0
30***99Bolt10
30***99Bolt8
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Komatsu : H185s-1(S/N G06128) : Superstructure : Pin, Boom - Counterweight
26***40Washer8
30***99Bolt1
30***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Superstructure : Rails And Platforms
27***40Grating 420x16501
27***40Grating1
30***99Bolt1
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Komatsu : H185s-1(S/N G06128) : Superstructure : Telescopic Steps Arr. And Ladders
11***99Cable Clamp2
30***99Bolt1
30***99Screw1
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Switch- And Junction Boxes
Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Cables Control Blocks
32***40Rail 300 Lg. Bulk Ware, State Length Required0
32***40Cable Union Pg 918
35***40Cable Protection Hose Pg 9x***00 Lg. Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Cables Control Frame
00***98Clamp 10/1520
32***40Rubber Grommet3
32***40Thread Pin20
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Cables Engine, Cu, Ktta
00***98Clamp 15/1520
05***40Rubber Grommet4
05***40Plug 3-Polig1
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Cables Oil Tank And Switch
00***98Clamp 15/1520
05***40Cable Lug, Red15
08***40Pressure Switch1
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Electric, Cab Support
04***40Dust Cap1
04***40Plug1
05***40Flanged Socket1
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Engine Switch Box X4
05***40Cable Shoe, Red0
05***40Cable Lug (M6)0
05***40Ground Wire - Series Terminal8
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : General View
25***40Limit Switch2
30***99Bolt4
51***40Resilient Sleeve4
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Junction Box (Cab Support) X11
05***40Ground Wire - Series Terminal3
25***40Housing, Empty1
32***99Screw2
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Junction Box Filter Frame X5
25***40Housing, Empty1
32***99Screw2
32***40Cable Union Pg 211
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Junction Box Oil Tank X3
05***40Ground Wire - Series Terminal5
25***40Housing, Empty1
32***99Screw6
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Junction Box, Control Blocks X6
05***40Ground Wire - Series Terminal10
25***40Housing, Empty1
32***99Screw6
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Komatsu : H185s-1(S/N G06128) : Switch- And Junction Boxes : Main Switch Box X2
27***40Sleeve Marker0
27***40Cable Channel 40x40 Ca. 1200 mm Bulk Ware, State Length Required0
32***99Cross Connection28
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Undercarriage
Komatsu : H185s-1(S/N G06128) : Undercarriage
Komatsu : H185s-1(S/N G06128) : Undercarriage : --Brake
00***98Shaft Seal2
31***99Plug9
33***99Seal Ring9
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Komatsu : H185s-1(S/N G06128) : Undercarriage : -Gear
00***98Shaft Seal2
08***95Shaft Seal2
30***99Bolt12
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Komatsu : H185s-1(S/N G06128) : Undercarriage : -Motor
25***40Plug1
31***99Screw M8 X 2014
31***99Bolt8
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Bottom Roller
30***99Bolt8
32***40Plug1
32***40Plug1
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Hydr. Tensioner
25***40Test-Screw Coupling1
25***40Seal Ring1
32***40Rod Guide Ring7
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Hydraulic
Komatsu : H185s-1(S/N G06128) : Undercarriage : Idler Assy.
30***99Screw8
31***40Axle Stirrup4
31***99Washer8
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Rotary Joint
16***40Screw Plug4
20***40Screw Plug2
30***99Bolt4
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Side Frame
22***40Lifetime Seal4
25***40Hv-Washer80
30***99Bolt 200lg. (Standard)64
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Top Roller
31***99Plug1
34***99Dowel Pin2
42***40Pin1
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Track Adjuster
00***98Test Socket2
15***40Test - Screw Coupling2
21***99Pipe ? 20x75 Bulk Ware, State Length Required0
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Track Group
33***99Nut (Standard)184
34***99Washer368
44***40Bolt184
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Travelling Brake
21***99Pipe, Assembly. ? 15x60 Bulk Ware, State Length Required0
37***99Union1
37***99Pipe Connection2
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Undercarriage
30***40Pin (Standard)8
30***99Screw64
30***99Bolt (Standard)8
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Komatsu : H185s-1(S/N G06128) : Undercarriage : Valve Block
00***98Union1
15***40Union2
21***99Pipe ? 20x75 Bulk Ware, State Length Required0
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Frequently asked questions

What engine does the Komatsu H185S-1 use?

The Komatsu H185S-1 uses a Komatsu diesel engine. Specific power output for larger variants in the series reaches 485 kW (651 HP) at 1,800 rpm.

What is the operating weight of the Komatsu H185S-1?

Operating weights for the H185S series range from 106,700 kg to 109,500 kg, varying by configuration and bucket size.

What replaced the Komatsu H185S-1?

The H185S-1 was succeeded by newer generations of Komatsu hydraulic mining excavators, including the PC-series large excavators, as the company transitioned its product line to incorporate advanced technology and larger capacities.

What H185S-1(S/N G06128) owners discuss

What are the typical powertrain and hydraulic behaviors for the Komatsu H185S-1 series?
The H115S-1 series is characterized by smooth hydraulic operation and high fuel efficiency. The hydraulic system relies on a main pump and control valve combination that is sensitive to wear; if the pump fails, the engine often follows due to excessive load. The machine is designed to wear out complete powertrain components simultaneously rather than gradually, which can negatively impact resale value. Operators note that the hydraulic response is generally superior to early generation competitors, but the system requires precise pressure regulation to maintain performance.
What undercarriage or wear patterns are typical for this machine type?
Undercarriage components, including track pads, bushings, and bearings, are subjected to significant wear and tear. Worn bushings can lead to increased noise and vibration, while worn bearings may cause premature failure of the tracks. The undercarriage is designed to last approximately 4,000 hours in standard conditions, but this varies by configuration and operating environment. Regular inspection of track tension and roller condition is required to prevent uneven wear and track loosening.
What are the known engine quirks for the Komatsu H185S-1 series?
Engine performance issues are a primary concern, often manifesting as power loss under load, increased fuel consumption, or overheating. These symptoms may indicate airflow restriction, injector wear, or failing fuel delivery components. The cooling system is critical; blockages in the radiator, hydraulic oil cooler, or charge-air cooler can cause overheating during heavy excavation. Owners report that the engine may idle normally but lose power when combining boom, arm, and bucket movements, suggesting a hydraulic load issue rather than an engine fault.
What are common electrical or sensor issues reported by operators?
The machine relies heavily on electronic control systems, meaning a single faulty sensor or unstable power supply can trigger multiple warning signals. Common issues include intermittent starting, dashboard failure, and random machine shutdowns. Owners report that the electrical system is complex, requiring proficiency in reading electrical and hydraulic schematics for diagnosis. Faulty batteries and poor ground connections are frequent causes of starting failures and erratic sensor behavior.
What should be checked when buying a used Komatsu H185S-1 (S/N G06128)?
Verify the exact serial-prefix specification sheet and installed attachment package, as these affect weight, reach, and fuel use. Inspect the hydraulic system for leaks, stuck components, and fluid levels. Check the engine cooling system for blockages and test the battery with a multimeter. Examine the undercarriage for worn bushings, bearings, and track pads. Review the machine for signs of corrosion, particularly in harsh environments. Confirm that the main safety valve is operational, as its failure can disrupt the entire hydraulic system.
What hydraulic fluid specifications are recommended for the Komatsu H185S-1?
Komatsu recommends using Komatsu Genuine Hydraulic Oil or equivalent fluids that meet Komatsu specifications. The specific fluid type depends on the operating temperature and environment. Operators should consult the operation and maintenance manual for the exact viscosity grade and capacity. Using incorrect or degraded oil can lead to internal leakage and reduced hydraulic performance, especially when the machine is hot.
What safety-critical fixes are associated with the main safety valve?
The main safety valve is critical for the smooth operation of the entire hydraulic system. If the machine exhibits slow heating or abnormal hydraulic behavior, the main safety valve should be inspected and maintained. Have your dealer verify the valve's operation and perform necessary repairs to ensure safe and efficient machine function.

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

Serial-range & configuration variants

This page covers the Komatsu H185S-1(S/N G06128). Related factory variants of the same model family:

H185S-1(S/N G06123)H185S-1(S/N G06081)H185S-1(S/N G06085)H185S-1(S/N G06091)H185S-1(S/N G06098)H185S-1(S/N G06120)H185S-1(S/N G06121)H185S-1(S/N G06122)

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