Komatsuhydraulic shovels(no series)
Komatsu H135S-1(S/N G61008)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu H135S-1 is a hydraulic shovel excavator designed for heavy mining and large-scale earthmoving applications. Production of the H135S series spans several decades, with the -1 generation succeeding earlier H-series models and preceding the H135S-2. The machine features a robust powertrain and undercarriage engineered for high-durability environments. Configurations vary by serial number and attachment package, offering different boom and stick lengths to suit specific digging depths and reach requirements. Operating weights for the H135S class generally fall within the heavy mining category, exceeding 150,000 lb (68,000 kg) depending on the specific counterweight and undercarriage setup.
Across the H-series generations, Komatsu refined the hydraulic system efficiency and undercarriage durability to extend service life in abrasive conditions. The H135S-1 remains significant in the used and parts market because its mechanical architecture shares components with other heavy Komatsu mining equipment, ensuring parts availability. As these machines age, the demand for reliable undercarriage replacements, hydraulic pumps, and engine components drives a strong aftermarket. The H135S-1's proven design makes it a staple in mining fleets where uptime is critical, and its widespread use supports a robust ecosystem of remanufactured and genuine 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 H135S-1(S/N G61008) specifications
Engine
| Model | VTA28-C-800 |
| Number of Cylinders | 12 |
| Displacement | 1708.7 cu in (28.0 L) |
| Gross Power | 728.2 hp (543 kW) |
| Net Power | 728 hp (543 kW) |
| Power Measured @ | 1800 rpm |
| Aspiration | Turbocharged |
Weights
| Operating Weight (Hydraulic Excavator Config) | the OEM part reference.2 lb (the OEM part reference kg) |
| Operating Weight (Loading Shovel Config) | the OEM part reference.15 lb (the OEM part reference kg) |
| Ground Pressure | 29.3 psi (202 kPa) |
Dimensions
| Width to Outside of Tracks | 16.77 ft (5.11 m) |
| Track Gauge | 13.95 ft (4.25 m) |
| Length of Track on Ground | 16.02 ft (4.88 m) |
| Ground Clearance | 2.55 ft (0.78 m) |
| Height to Top of Cab | 20.45 ft (6.23 m) |
| Tail Swing Radius | 16.21 ft (4.94 m) |
| Removal Counterweight Clearance | 6.32 ft (1.93 m) |
| Shoe Size | 23.63 in (600 mm) |
Performance
| Max Travel Speed | 1.5 mph (2.4 km/h) |
| Swing Speed | 6.2 rpm |
| Hydraulic Pump Flow Capacity | 435.9 gal/min (1650 L/min) |
| Hydraulic System Relief Valve Pressure | 4495 psi (31 MPa) |
| Max Digging Depth | 26.91 ft (8.20 m) to 47.91 ft (14.60 m) varies by boom/stick option |
| Max Cutting Height | 48.23 ft (14.70 m) to 60.04 ft (18.30 m) varies by boom/stick option |
| Max Reach Along Ground | 45.94 ft (14.00 m) to 68.25 ft (20.80 m) varies by boom/stick option |
| Max Loading Height | 32.16 ft (9.80 m) to 47.25 ft (14.40 m) varies by boom/stick option |
| Reference Bucket Capacity | 12.5 cu yd (9.55 m3) |
| Minimum Bucket Capacity | 4 cu yd (3.06 m3) |
| Maximum Bucket Capacity | 12.5 cu yd (9.55 m3) |
Service capacities (summary)
| Fuel Capacity | 475.6 gal (1800 L) |
| Hydraulic System Fluid Capacity | 425.4 gal (1610 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu H135S-1(S/N G61008) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the H135S-1(S/N G61008) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals, hydraulic particle counts, and coolant SCA levels. Track hydraulic oil viscosity and oxidation trends to predict pump and valve degradation before failure. Monitor DEF levels and KDPF status via KOMTRAX telematics to manage emissions system health proactively. Analyze final drive oil for gear wear indicators to schedule planetary drive repairs during planned downtime rather than unexpected breakdowns.
Corrective & Common Repairs
Address hydraulic hose leaks and cracked fittings promptly to prevent contamination of the closed-center load sensing system. Replace worn track shoes and adjust track tension to reduce undercarriage wear and improve machine stability on uneven ground. Inspect and replace worn boom and stick pins and bushings to maintain hydraulic cylinder alignment and prevent structural stress. Repair or replace faulty pilot oil units and slew-brake valves to restore precise control and safe stopping capability.
Overhaul & Rebuild Points
Plan major overhauls for the swing machinery and slew gear at high-hour intervals to address bearing wear and gear backlash. Rebuild hydraulic pumps and motors when flow rates drop below specification or internal leakage causes slow cycle times. Inspect final drive planetary gears and seals for wear, replacing components before catastrophic failure occurs. Evaluate the engine block and cylinder heads for wear, considering a full engine rebuild when compression drops or oil consumption exceeds limits.
Seasonal & Environment Servicing
Install hot-water heaters in cold climates to ensure engine block and hydraulic fluid warm-up before operation. Drain water from the fuel separator more frequently in humid or wet environments to prevent fuel system corrosion and injector damage. Inspect radiator and oil cooler fins for debris buildup, cleaning them regularly to maintain optimal cooling performance in dusty mining sites. Check ROPS/FOPS integrity and tighten all structural bolts to address vibration-induced loosening in high-dust, high-vibration conditions.
H135S-1(S/N G61008) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 4N5 823 | Fuel Filter Cartridge | Fuel system service | Check fitment → |
| 2P4 005 | Oil Filter Cartridge | Lubrication service | Check fitment → |
| 358 601 40 | Return Oil Filter, Assembly | Lubrication service | Check fitment → |
| 414 024 40 | Return Oil Filter (H65, H135) (H65, H135) A = 375 | Lubrication service | Check fitment → |
| 691 865 | Filter Insert (Paper) - Return Oil Filter - Leakage | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
H135S-1(S/N G61008) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Faulty crankshaft speed sensor, broken wiring harness, or corroded connector at the sensor pin | Inspect the sensor wiring and connector for damage; replace the speed sensor if voltage is abnormal at the pin |
| CA441 | Battery voltage too low | Weak or discharged battery, loose terminals, or failing alternator | Check battery charge state and terminal tightness; test alternator output and replace if faulty |
| CA442 | Battery voltage too high | Faulty voltage regulator or failing alternator | Replace the alternator or check the voltage regulator circuit |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or short in the sensor wiring | Verify the intake pressure sensor operation and inspect the wiring harness for shorts |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit or restricted airflow upstream of the sensor | Check for a sensor short and inspect for any airflow restrictions in the intake system |
| CA153 | Intake air temperature sensor feedback voltage too high | Faulty intake air temperature (IAT) sensor | Replace or test the IAT sensor for proper operation |
| CA154 | Intake air temperature sensor feedback voltage too low | Faulty intake air temperature (IAT) sensor | Replace or test the IAT sensor for proper operation |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and review engine load cycles for misuse |
| CA451 | Common rail pressure sensor feedback value too high | Malfunctioning rail pressure sensor or actual overpressure condition in the fuel system | Diagnose the fuel rail pressure sensor or inspect pump lines for blockage |
| CA452 | Common rail pressure sensor feedback value too low | Malfunctioning rail pressure sensor or low fuel pressure | Diagnose the fuel rail pressure sensor or inspect pump lines for blockage |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
H135S-1(S/N G61008) attachments & work tools
Standard Digging Bucket
Typical capacity for this class ranges from 10 to 14 cubic yards (7.6 to 10.7 cubic meters). Factory configurations vary by boom/stick option, with the 26'3" boom paired with shorter sticks and the 39'4" boom offering longer reach configurations.
Heavy Duty / Rock Bucket
Designed for high-abrasion applications with reinforced side cutters and bottom plates. Capacity is generally lower than standard buckets, often around 8 to 10 cubic yards (6.1 to 7.6 cubic meters), to maintain structural integrity under heavy load.
Light Material / Grading Bucket
Available with wider widths and grading edges for fine grading and cleanup work. Capacities typically align with the standard digging bucket range but feature a flatter profile and fewer teeth for smoother material handling.
Coupler / Quick Attach System
The H135S-1 utilizes a mechanical pin-on coupling system for tool attachment. Hydraulic quick couplers are available as an option to facilitate rapid tool changes without leaving the cab, requiring specific hydraulic line routing.
Hydraulic Circuit Configuration
Tools requiring auxiliary hydraulics (e.g., hydraulic breakers, hammers) require a dedicated auxiliary circuit. The machine's hydraulic pump flow capacity of 435.9 gal/min (1651 L/min) supports high-flow tool operations, with relief valve pressure set at 4495 psi (31 MPa).
Factory Guarding Options
Optional guarding includes rock shields for the boom, stick, and bucket, as well as side guards for the undercarriage and engine compartment. These are factory-installed or dealer-fitted to protect against impact damage in mining and quarry environments.
Engine Specification
The H135S-1 is powered by a Komatsu VTA28-C-800 diesel engine with 12 cylinders. Gross power output is 728.2 hp (543 kW) at 1800 rpm, with a displacement of 1708.7 cu in (28 L).
All H135S-1(S/N G61008) assemblies by section
Every catalogued assembly group for the Komatsu H135S-1(S/N G61008). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
* = Variations From Page:
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : Acceleration Relay Fig-No : 35/K42 (Pulse Relay)
| 05***40 | Pull Switch | 1 |
| 05***40 | Flanged Socket | 1 |
| 05***40 | Diode | 2 |
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : Console For Compressor
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : Grease 50 Kg
| 00***98 | Locking Spring | 1 |
| 20***40 | Hose Assembly. Nw 12x1800 | 1 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : Socket
| 05***40 | Pull Switch | 1 |
| 05***40 | Flanged Socket | 1 |
| 05***40 | Diode | 2 |
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : Spring Retainer
Komatsu : H135s-1(S/N G61008) : * = Variations From Page : : V-Belt Pulley For Compressor
Annex
Komatsu : H135s-1(S/N G61008) : Annex : Colour : Chrome Yellow
Komatsu : H135s-1(S/N G61008) : Annex : Electric Schematic
Komatsu : H135s-1(S/N G61008) : Annex : Hydraulic Schematic
Komatsu : H135s-1(S/N G61008) : Annex : Tools And Accessories
Backhoe Equipment
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Backhoe 7,5 M?
| 41***40 | Tooth Adapter | 3 |
| 41***40 | Corner Adapter | 1 |
| 41***40 | Corner Adapter | 1 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Boom 8,0 M
| 00***98 | Mounting Clip | 4 |
| 00***98 | Mounting Clip | 2 |
| 00***98 | Grease Nipple | 8 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Boom Cylinder With Adapters R.H. And L.H.
| 00***98 | O-Ring | 1 |
| 31***99 | Socket Head Cap Screw | 8 |
| 36***99 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Hydr. Cylinder
| 00***98 | O-Ring | 1 |
| 00***98 | Grease Nipple | 3 |
| 00***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Pipes Bucket Cylinder
| 00***98 | O-Ring | 1 |
| 26***40 | Connecting Block | 1 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Pipes Stick Cylinder
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 2 |
| 11***40 | Pipe Bracket | 1 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Stick 3,6 M
| 00***98 | Mounting Clip | 3 |
| 00***98 | Mounting Clip | 3 |
| 00***98 | Clamp | 1 |
Komatsu : H135s-1(S/N G61008) : Backhoe Equipment : Wishbone And Rod
| 00***98 | Grease Nipple | 5 |
| 21***40 | Bolt Lock | 2 |
| 26***40 | Stripper | 6 |
Drive
Komatsu : H135s-1(S/N G61008) : Drive
Komatsu : H135s-1(S/N G61008) : Drive : -Air Cleaner
| 30***99 | Bolt | 20 |
| 30***99 | Lock Washer | 22 |
| 33***99 | Nut | 22 |
Komatsu : H135s-1(S/N G61008) : Drive : -Engine
| 2P***05 | Oil Filter Cartridge | 2 |
| 2W***87 | Pressure Gauge, Fuel | 1 |
| 3T***67 | Starter | 1 |
Komatsu : H135s-1(S/N G61008) : Drive : -Fan Pump
| 25***40 | Plug | 1 |
| 31***99 | Screw | 4 |
| 31***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61008) : Drive : -Main Pump
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 2 |
| 17***40 | Plug | 2 |
Komatsu : H135s-1(S/N G61008) : Drive : -Pump Distributor Gear
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 4 |
| 08***54 | O-Ring | 2 |
Komatsu : H135s-1(S/N G61008) : Drive : -Radiator
| 00***98 | Clamp | 2 |
| 30***99 | Screw | 20 |
| 31***99 | Plug | 6 |
Komatsu : H135s-1(S/N G61008) : Drive : Air Cleaning System, Cat
| 00***98 | Bolt | 16 |
| 00***98 | Hose Clip | 6 |
| 14***40 | Maintenance Switch | 2 |
Komatsu : H135s-1(S/N G61008) : Drive : Drive, Cat
| 00***98 | Hose Clamp | 2 |
| 00***98 | Bolt | 16 |
| 14***40 | Dust Cap | 1 |
Komatsu : H135s-1(S/N G61008) : Drive : Engine : Caterpillar
Komatsu : H135s-1(S/N G61008) : Drive : Exhaust System, Cat
| 21***40 | Muffler | 1 |
| 23***40 | Half Clamp | 2 |
| 23***40 | Half Clamp | 2 |
Komatsu : H135s-1(S/N G61008) : Drive : Fan Mounting - Radiator
| 00***98 | Union | 2 |
| 30***40 | Disc | 2 |
| 30***99 | Bolt 25 mm Lg | 4 |
Komatsu : H135s-1(S/N G61008) : Drive : Fuel Lines, Cat
| 23***40 | Ball Cock | 1 |
| 25***40 | Hose Dn 12 X Ca. 4000 Lg. Bulk Ware, State Length Required | 1 |
| 25***40 | Hose Fittings | 1 |
Komatsu : H135s-1(S/N G61008) : Drive : Lines For Radiator, Cat
| 00***98 | Clamp | 4 |
| 00***98 | Clamp | 4 |
| 00***98 | Clamp | 4 |
Komatsu : H135s-1(S/N G61008) : Drive : Output :
Komatsu : H135s-1(S/N G61008) : Drive : Pump And Distributor Gear Arrangement
| 00***98 | Union | 1 |
| 26***40 | Hose Fittings | 2 |
| 30***99 | Bolt | 12 |
Komatsu : H135s-1(S/N G61008) : Drive : Radiator Arr.
| 00***98 | Union | 2 |
| 08***80 | Hinge Pin | 4 |
| 12***40 | Base | 1 |
Komatsu : H135s-1(S/N G61008) : Drive : Serial-No. :
Komatsu : H135s-1(S/N G61008) : Drive : Series :
Komatsu : H135s-1(S/N G61008) : Drive : Suction Lines
| 00***98 | O-Ring | 1 |
| 26***40 | Hose Fittings | 5 |
| 30***99 | Bolt 35 Lg | 12 |
Electric
Komatsu : H135s-1(S/N G61008) : Electric : Batteries With Cables
| 00***98 | Pipe Clamp, Rubber Armed | 8 |
| 14***40 | Cable Shoe | 8 |
| 30***99 | Screw | 4 |
Komatsu : H135s-1(S/N G61008) : Electric : Cables - Cab Support
| 05***15 | Cable Protection Hose Ca. 4000 mm Bulk Ware, State Length Required | 6 |
| 32***40 | Cable Union Pg 21 | 3 |
| 35***40 | Cable Protection Hose Pg 16 Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Electric : Cables - Oil Tank And Control Frame
| 00***98 | Clamp 22/15 | 10 |
| 05***40 | Cable Lug, Red | 15 |
| 05***15 | Cable Protection Hose Ca. 4000 mm Bulk Ware, State Length Required | 17 |
Komatsu : H135s-1(S/N G61008) : Electric : Cables Superstructure
| 00***98 | Clamp 15/15 | 5 |
| 00***98 | Clamp 18/15 | 20 |
| 05***40 | Cable Lug, Red | 15 |
Komatsu : H135s-1(S/N G61008) : Electric : Electric Equipment
| 25***40 | Housing, Empty | 2 |
Komatsu : H135s-1(S/N G61008) : Electric : Horn, Illumination
| 25***40 | Compressor-Single Ton-Horn Consist. Of Fig.-No: 03-05 | 1 |
| 27***40 | Compressor-Two Ton-Horn Consist. Of Fig.-No: 05-08 | 1 |
| 30***99 | Bolt 20 mm Lg | 4 |
Komatsu : H135s-1(S/N G61008) : Electric : Junction Box On Oil Tank
| 05***40 | Pull Switch | 1 |
| 25***40 | Housing, Empty | 1 |
| 32***99 | Screw | 6 |
Komatsu : H135s-1(S/N G61008) : Electric : Main Switch Box In Cabin Support
| 05***40 | Pull Switch | 1 |
| 05***40 | Flanged Socket | 1 |
| 05***40 | Diode | 2 |
Komatsu : H135s-1(S/N G61008) : Electric : Operation Panel
| 14***40 | Disc | 8 |
| 30***40 | Cover | 1 |
| 30***40 | Retainer | 1 |
Komatsu : H135s-1(S/N G61008) : Electric : Standard Lighting Equipment
| 00***98 | Clamp 15/15 | 30 |
| 05***40 | Cable Protection Hose Pg 7 Bulk Ware, State Length Required | 0 |
| 05***40 | Plug To Fig-No: 17 | 3 |
Komatsu : H135s-1(S/N G61008) : Electric : Switch Box - Engine
| 05***40 | Cable Union | 1 |
| 27***40 | Connector Socket | 1 |
| 32***99 | Screw | 4 |
Komatsu : H135s-1(S/N G61008) : Electric : Wire Layout - Engine, Cat
| 05***40 | Cable Lug, Red | 15 |
| 35***40 | Cable Protection Hose Pg 9x***00 Lg. Bulk Ware, State Length Required | 0 |
| 35***40 | Cable Protection Hose Pg 21 Pg 21x1400 Lg. Bulk Ware, State Length Required | 2 |
General View
Komatsu : H135s-1(S/N G61008) : General View : General View Backhoe Equipment
Komatsu : H135s-1(S/N G61008) : General View : General View Drive
Komatsu : H135s-1(S/N G61008) : General View : General View Electric
Komatsu : H135s-1(S/N G61008) : General View : General View Hydraulic
Komatsu : H135s-1(S/N G61008) : General View : General View Lubrication- And Refueling Equipment
Komatsu : H135s-1(S/N G61008) : General View : General View Operator'S Cab
Komatsu : H135s-1(S/N G61008) : General View : General View Shovel
Komatsu : H135s-1(S/N G61008) : General View : General View Superstructure
Komatsu : H135s-1(S/N G61008) : General View : General View Undercarriage
Komatsu : H135s-1(S/N G61008) : General View : Machine-Maintenance Parts, Cat
| 25***40 | O-Ring, H.P. Element Lubrication + Cooling | 3 |
| 26***40 | Air Cleaner, Cabin Supercharger | 1 |
| 2P***05 | Oil Filter Cartridge | 2 |
Heater And Air Condit. Equipment
Komatsu : H135s-1(S/N G61008) : Heater And Air Condit. Equipment : -Compressor
Komatsu : H135s-1(S/N G61008) : Heater And Air Condit. Equipment : -Heater Assembly
| 30***99 | Bolt | 10 |
| 33***99 | Nut | 10 |
| 41***40 | Heater Assembly | 1 |
Komatsu : H135s-1(S/N G61008) : Heater And Air Condit. Equipment : Compressor Drive, Air- Conditioning
Komatsu : H135s-1(S/N G61008) : Heater And Air Condit. Equipment : Hot-Water-Heater, Cat
| 25***40 | Hose Dn 12 X Ca. 4000 Lg. Bulk Ware, State Length Required | 2 |
| 25***40 | Breather Up To 06 122 | 2 |
| 25***40 | Screwed Fittings | 2 |
Hydraulic
Komatsu : H135s-1(S/N G61008) : Hydraulic
Komatsu : H135s-1(S/N G61008) : Hydraulic : -Anticavitation Valve
| 25***40 | Anticavitation Valve Assembly. Ng 20 | 1 |
| 36***99 | O-Ring | 2 |
| 50***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -Bleed-Off Valve
| 00***98 | O-Ring | 2 |
| 32***40 | Valve, Pre-Controlled Assembly. 125 Bar | 0 |
| 35***40 | Pressure Valve For Bullclam Bucket Equipment | 0 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -Control Blocks
| 00***98 | O-Ring | 20 |
| 16***40 | Release Valve | 6 |
| 31***99 | Eye Bolt | 2 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -H.P. Filter
| 31***99 | Screw | 4 |
| 32***40 | Differential Pressure Switch Assembly. (8,5bar) | 1 |
| 34***99 | Lock Washer | 4 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -H.P. Filter For Fan, Lube- And Pilot Oil
| 25***40 | O-Ring, H.P. Element Lubrication + Cooling | 1 |
| 31***99 | Screw | 4 |
| 34***99 | Lock Washer | 4 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -H.P. Filter For Gear Oil
| 25***40 | O-Ring, H.P. Element Lubrication + Cooling | 1 |
| 31***99 | Screw | 4 |
| 34***99 | Lock Washer | 4 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -Load Limitation Valve
| 17***40 | Plug | 3 |
| 33***99 | Nut | 1 |
| 36***40 | Load Limitation Valve Assembly. For H 121 (All Diesel Engines) | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : -Pressure Relief Valve
| 00***98 | O-Ring | 1 |
| 31***99 | Screw | 4 |
| 44***40 | Directional Spool Valve Assembly. With Fig-Nos: 09-14 | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Add. Parts Backhoe Control
| 00***98 | Union | 4 |
| 21***99 | Pipe ? 12 Ca 300mm Bulk Ware, State Length Required | 0 |
| 25***40 | Hose Dn 8 X Ca. 2000 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Control Blocks - Oil Tank - Pumps
| 00***98 | Half Flange | 12 |
| 00***98 | Half Flange | 12 |
| 00***98 | Flange Seal | 6 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Control Blocks - Swing Gear
| 00***98 | Half Flanged | 4 |
| 00***98 | Half Flange | 4 |
| 00***98 | Union | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Control Clamshell And Drive
| 00***98 | Union | 4 |
| 25***40 | Hose Fittings | 0 |
| 26***40 | Hose Nw 10x Ca. 8000 mm Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Filter And Valve Arrangement
| 08***40 | Pressure Relief Valve (10 Bar) | 1 |
| 15***40 | Test - Screw Coupling | 1 |
| 17***40 | Union | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Hydr. Oil Cooler
| 00***98 | Test Socket | 1 |
| 00***98 | Half Flange | 2 |
| 00***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Hydraulic Control
| 00***98 | Socket | 1 |
| 00***98 | Union | 1 |
| 12***40 | Retainer | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Lines - Control Blocks - Rotary Joint
| 00***98 | Half Flange | 8 |
| 00***98 | Union | 1 |
| 17***40 | Union | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Lines - Manifold - Basic Boom
| 00***98 | Half Flanged | 12 |
| 30***99 | Bolt | 24 |
| 31***99 | Screw | 48 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Manifold - Control Blocks And H.P. Filter
| 00***98 | Half Flange | 6 |
| 15***40 | Plug | 3 |
| 15***40 | Test - Screw Coupling | 7 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Pilot Oil Units L.H., R.H. And L.H. Rear Euro
| 00***98 | Union | 12 |
| 25***40 | Hose Fittings | 12 |
| 25***40 | Hose Fittings | 0 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Piping - Control Blocks - Manifold
| 00***98 | O-Ring | 4 |
| 00***98 | O-Ring | 24 |
| 00***98 | Union | 4 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Primary Control-Stick
| 00***98 | Union | 3 |
| 21***99 | Pipe ? 12 Ca 300mm Bulk Ware, State Length Required | 0 |
| 25***40 | Hose Dn 8 X Ca. 2000 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Pump Bearing Lubrication With Expansion Tank
| 25***40 | Hose Dn 12 X Ca. 4000 Lg. Bulk Ware, State Length Required | 1 |
| 25***40 | Screwed Fittings | 1 |
| 26***40 | Hose Fittings | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Pump Lube And Regulating Equipment
| 00***98 | Test Union | 1 |
| 00***98 | Union | 1 |
| 00***98 | Socket | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Throttle Check Valve
| 08***40 | O-Ring | 1 |
| 17***40 | Screw Plug | 1 |
| 25***40 | Valve Disk | 1 |
Komatsu : H135s-1(S/N G61008) : Hydraulic : Transmission - Oil Cooler
| 00***98 | Socket | 1 |
| 00***98 | Union | 1 |
| 08***40 | Pressure Relief Valve (10 Bar) | 1 |
Lubrication- And Refueling Equipment
Komatsu : H135s-1(S/N G61008) : Lubrication- And Refueling Equipment : -Grease Gun
| 69***73 | Coupling With Pipe | 1 |
| 69***73 | Coupling | 1 |
| 69***73 | Adapter | 1 |
Komatsu : H135s-1(S/N G61008) : Lubrication- And Refueling Equipment : -Hose Reel
| 69***09 | Lock Washer | 1 |
| 69***67 | Swivel Union, Assembly | 1 |
| 69***68 | Hose Reel Fig-Nos. 01-39 | 1 |
Komatsu : H135s-1(S/N G61008) : Lubrication- And Refueling Equipment : -Pump
| 69***94 | Valve Cap | 1 |
| 69***95 | Gasket | 1 |
| 69***96 | Valve Kit | 1 |
Komatsu : H135s-1(S/N G61008) : Lubrication- And Refueling Equipment : Grease Pump Arrangement
| 00***98 | Locking Spring | 1 |
| 20***40 | Hose Assembly. Nw 12x1800 | 1 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61008) : Lubrication- And Refueling Equipment : Hydr. Pressure Lubric.System
| 00***98 | Test Socket | 1 |
| 18***40 | Connection Plate | 2 |
| 21***99 | Precision Tubing 10x1.5 Bulk Ware, State Length Required | 0 |
Operator'S Cab
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Aux. Cab Parts
| 08***40 | Mirror | 2 |
| 11***40 | Mirror Bracket, R.H | 1 |
| 16***40 | Buffer | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Cab Support And Protection Roof
| 08***40 | Lock Assembly | 1 |
| 08***40 | Handle | 1 |
| 16***40 | Profiled Joint 4400 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Cover
| 16***40 | Flex. Header Ca. 350 Lg. Bulk Ware, State Length Required | 0 |
| 16***40 | Flex. Header Ca. 1300 Lg. Bulk Ware, State Length Required | 0 |
| 19***40 | Shackle | 6 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Ladder
| 18***40 | Limit Switch | 1 |
| 30***99 | Cable Clamp | 2 |
| 30***99 | Bolt | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Ladders
| 30***99 | Screw | 15 |
| 30***99 | Screw | 6 |
| 30***99 | Screw | 0 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Operator'S Cab
| 05***40 | Grommet | 2 |
| 05***40 | Socket | 2 |
| 05***40 | Bulb 10 W | 4 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Operator'S Cab/Glazing
| 08***40 | Clamping Section 2800 Lg. (To Fig-Nos. 02,04) Bulk Ware, State Length Required | 2 |
| 08***40 | Filler Section 3000 Lg. Bulk Ware, State Length Required | 2 |
| 30***40 | Rear Window 803x458 | 2 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Operator'S Seat
| 30***99 | Bolt | 2 |
| 42***40 | Operator'S Seat Assembly | 1 |
| 50***98 | Screw | 3 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Operator'S Stand
| 26***40 | Air Cleaner, Cabin Supercharger | 1 |
| 30***40 | Rubber-Metal Block | 1 |
| 30***40 | Rubber-Metal Block | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Pilot Oil Unit Boom, Stick
| 34***99 | Pin | 2 |
| 41***40 | Pilot Oil Unit Assembly | 1 |
| 50***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Pilot Oil Unit Bullclam And Drive About Pedal
| 41***40 | Pilot Oil Unit Assembly | 1 |
| 69***73 | Control Part | 2 |
| 69***73 | Pedal | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Pilot Oil Unit Drive
| 33***99 | Nut | 1 |
| 34***99 | Pin | 2 |
| 36***40 | Pilot Oil Unit, Assembly | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Pilot Oil Unit, Brake
| 34***40 | Pilot Oil Unit Assembly | 1 |
| 69***22 | Return Spring | 1 |
| 75***73 | Base Assembly. Consist. Of Fig-Nos: 04-12 | 1 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Rails And Gratings
| 26***40 | Pin | 5 |
| 30***99 | Lock Washer | 16 |
| 30***99 | Screw | 0 |
Komatsu : H135s-1(S/N G61008) : Operator'S Cab : Windscreen Washing Assy.
Superstructure
Komatsu : H135s-1(S/N G61008) : Superstructure
Komatsu : H135s-1(S/N G61008) : Superstructure : -Fan Motor
| 31***99 | Screw | 2 |
| 31***99 | Screw | 4 |
| 34***99 | Shim Washer 85x105x0,3 | 1 |
Komatsu : H135s-1(S/N G61008) : Superstructure : -Filter
| 33***99 | Nut | 1 |
| 44***40 | Aeration Filter, Assembly | 1 |
| 69***89 | Socket Housing | 1 |
Komatsu : H135s-1(S/N G61008) : Superstructure : -Pressure Relief Valve
| 31***99 | Plug | 1 |
| 31***99 | Eyebolt | 2 |
| 31***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61008) : Superstructure : -Return Oil Filter
| 10***65 | O-Ring | 1 |
| 33***99 | Nut | 2 |
| 33***99 | Nut | 1 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Fan Mounting, Oil Cooler
| 30***99 | Screw | 10 |
| 30***99 | Bolt | 4 |
| 32***40 | Locking Plate | 3 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Fuel Tank
| 05***40 | Plug 3-Polig | 1 |
| 08***40 | Oil-Level Glass | 1 |
| 08***40 | Quick Disconnect Coupling | 1 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Oil Cooler
| 12***40 | Hinge | 2 |
| 15***40 | Tape Roller | 2 |
| 16***40 | Profiled Joint Ca. 6000 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Oil Tank
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Platform With Counterweight
| 13***40 | Pin | 2 |
| 21***40 | Bolt Lock | 4 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61008) : Superstructure : Suction Tank
| 08***40 | Quick Disconnect Coupling | 1 |
| 08***40 | Protection Cap | 1 |
| 20***40 | Plug | 1 |
Swing Ring
Komatsu : H135s-1(S/N G61008) : Swing Ring : -Brake
| 31***99 | Socket Head Cap Srew | 12 |
| 33***99 | Seal Ring | 1 |
| 33***99 | Seal Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Swing Ring : -Hydr. Motor
| 00***98 | O-Ring | 1 |
| 08***74 | Component Sealing Applies To Fig-No. 40, 58, 131 | 0 |
| 17***40 | Screw Plug | 1 |
Komatsu : H135s-1(S/N G61008) : Swing Ring : -Swing Gear Box
| 30***99 | Screw | 12 |
| 31***99 | Plug | 2 |
| 31***99 | Bolt | 6 |
Komatsu : H135s-1(S/N G61008) : Swing Ring : Lube Arrangement
| 00***98 | Mounting Clip | 4 |
| 00***98 | Mounting Clip | 1 |
| 00***98 | Clamp | 2 |
Komatsu : H135s-1(S/N G61008) : Swing Ring : Swing Ring
Komatsu : H135s-1(S/N G61008) : Swing Ring : Swing Ring And Swing Gear Box Arrangement
| 12***40 | Dowel Pin | 2 |
| 18***40 | Bolt | 72 |
| 22***40 | Lip Type Seal Ng 25 X 9.200 mm Bulk Ware, State Length Required | 1 |
Undercarriage
Komatsu : H135s-1(S/N G61008) : Undercarriage
Komatsu : H135s-1(S/N G61008) : Undercarriage : -Chain
| 44***40 | Track (H135-47 Links) | 1 |
| 69***25 | Spacer | 4 |
| 69***73 | Track Bush | 94 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : -Hydr. Motor
| 00***98 | O-Ring | 1 |
| 08***74 | Component Sealing Applies To Fig-No. 40, 58, 131 | 0 |
| 17***40 | Screw Plug | 1 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : -Top Roller
| 18***40 | Sliding Ring Seal | 1 |
| 30***99 | Bolt | 3 |
| 30***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : -Track Roller
| 00***98 | O-Ring | 1 |
| 11***40 | Bottom Roller Assembly | 1 |
| 14***40 | Lifetime Seal | 2 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : -Traction Transmission
Komatsu : H135s-1(S/N G61008) : Undercarriage : Grease Tensioning Cylinder
| 18***40 | Wiper | 1 |
| 18***40 | V-Seal | 1 |
| 18***40 | Piston Ring | 2 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : Hydraulic
| 00***98 | Half Flanged | 8 |
| 00***98 | Half Flange | 8 |
| 00***98 | O-Ring | 4 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : Idler Assy.
| 00***98 | O-Ring | 2 |
| 18***40 | Lifetime Seal | 2 |
| 18***40 | Lifting Beam | 1 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : Rotary Joint
| 16***40 | Screw Plug | 4 |
| 20***40 | Screw Plug | 1 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : Track Adjuster (Nitrogen)
| 20***40 | Plug | 1 |
| 20***40 | Piston Ring | 2 |
| 20***40 | Piston Ring | 1 |
Komatsu : H135s-1(S/N G61008) : Undercarriage : Undercarriage
| 17***40 | Union | 1 |
| 25***40 | Hv-Washer | 36 |
| 25***40 | Hv-Washer | 48 |
Frequently asked questions
What engine does the Komatsu H135S-1 use?
The Komatsu H135S-1 is equipped with a Komatsu diesel engine designed for heavy-duty mining applications. Specific engine model and horsepower ratings vary by configuration and production year. Consult the machine's data plate or operation and maintenance manual for the exact engine designation and specifications.
What is the operating weight of the Komatsu H135S-1?
Operating weight varies by configuration, including counterweight, undercarriage type, and attachment package. The H135S class generally operates in the heavy mining weight class, with weights exceeding 150,000 lb (68,000 kg). Specific weight data for serial number G61008 is not documented in the provided sources; verify with your dealer or the machine's nameplate.
What model replaced the Komatsu H135S-1?
The Komatsu H135S-2 is the successor to the H135S-1 hydraulic shovel. Komatsu updated the H-series with improved hydraulic efficiency, undercarriage durability, and operator comfort features in the -2 generation. Earlier models in the lineage include the original H135S.
What H135S-1(S/N G61008) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu H135S-1 series?
The H1135S-1 series utilizes a variable displacement pump with a closed-center load sensing system. This configuration allows for controlled fluid flow during lifting operations, resulting in no engine revving and reduced fuel consumption. The system is designed to be smooth to run and very fuel efficient compared to earlier generation machines. Owners note that if the hydraulic pump fails, the engine is often not far behind, contributing to lower resale values for the line. Hydraulic performance degrades when hot due to decreased oil viscosity exposing internal leakage in pumps, main control valves, cylinders, or motors. Cold operation may mask these issues, so pressure and flow testing should be performed in both temperature states. Shared hydraulic supply issues cause all functions (boom, arm, bucket, swing, travel) to become slow simultaneously, whereas a single slow function points to circuit-specific components like load-holding valves or pilot controls. The main safety valve is critical for smooth operation and requires regular inspection to prevent slow heating or weak movements. Dash 6 machines in the broader Komatsu line had known valve problems, particularly on smaller models like the PC150 and PC120, though the H135S-1 represents a later redesign phase with updated pump and valve combinations.
What undercarriage and wear patterns are typical for this machine type?
Undercarriage components such as track pads, bushings, and bearings are subjected to significant wear and tear. Worn bushings lead to noise and vibration, while worn bearings cause premature track failure. Track tension must be monitored regularly; repeated loosening indicates issues with the tensioner or undercarriage wear. Machines may drift or pull to one side due to track tension differences, mud packed into the undercarriage, roller condition, or track-chain wear. Mechanical resistance must be checked before diagnosing travel motors or final drives. Final drives may produce grinding noises from the travel motor, requiring inspection of oil levels and contamination. The undercarriage is designed to wear out complete machines simultaneously in some configurations, accelerating total replacement needs. Corrosion from moisture, dust, and salt exacerbates wear on exposed components. Preventive maintenance plans and timely replacement of worn parts are essential to restore performance and minimize downtime. Operating weight and ground pressure are key factors in undercarriage selection and wear rates.
What are the known engine quirks for the Komatsu H135S-1 series?
Engine performance issues are a dominant concern, including loss of power, increased fuel usage, and overheating. These symptoms often signal airflow restriction, injector wear, or failing fuel delivery components. Contamination, extended service intervals, and low-quality fuel accelerate engine wear. Engines may idle normally but lose power under heavy digging loads due to air filter blockage, fuel filter restriction, fuel tank venting issues, or damaged charge-air hoses. Overheating during heavy excavation is common if the cooling package (radiator, hydraulic oil cooler, charge-air cooler) is packed with debris between heat exchangers. A machine may show marginal cooling capacity if temperature rises during work but falls during idle. Coolant expulsion or high system pressure after cold start indicates deeper engine issues. Fuel system problems include damaged engines, inadequate cooling, and faulty batteries. Intermittent starting, dashboard failure, or random shutdowns can result from electrical control system faults. Komatsu engines are robust but require strict adherence to maintenance schedules to avoid premature failure. The specific engine model for serial G61008 is not detailed in the provided sources; verify with the machine's data plate or dealer.
What are common electrical and sensor issues reported by owners?
Komatsu excavators rely heavily on electronic control systems, making them susceptible to faults from single sensors or unstable power supplies. Common issues include intermittent starting, dashboard failure, and random machine shutdowns. Multiple fault codes often point to battery condition, ground connections, or connector integrity rather than individual component failure. Electrical circuit faults and sensor malfunctions affect machine functionality and control. Owners report that machines are complicated and require proficiency in reading electrical and hydraulic schematics for diagnosis. The electronic control strategy is model-specific, so accurate identification of the machine is necessary before troubleshooting. Unstable power supply can trigger multiple warning signals simultaneously. Regular inspection of power supply, sensor functionality, and control panel operation is essential. The specific electrical architecture for serial G61008 is not detailed in the provided sources; verify with the machine's service manual.
What should be checked when buying a used Komatsu H135S-1 (S/N G61008)?
Verify the exact serial-prefix specification sheet and installed attachment package, as configurations like long stick, wide track shoes, quick couplers, auxiliary hydraulics, or regional emissions packages change weight, reach, fuel use, and transport planning. Check the engine oil level, cooling system for blockages, and battery with a multimeter. Inspect hydraulic lines and cylinders for leaks caused by worn seals or over-pressurization. Test hydraulic performance cold and hot to identify internal leakage. Check track tension, roller condition, and track-chain wear. Inspect bushings and bearings for wear that causes noise or vibration. Verify the main safety valve operation. Check for corrosion on metal components. Ensure the machine has a valid data tag and serial number location matches factory standards (front of machine between hydraulic arms). Be aware that Komatsu machines may break before they wear out, and resale value can be poor if major components fail. Parts availability for gray market machines can be difficult. Consult official OEM service manuals for precise operating specs and safety protocols. Have your dealer verify the specific engine model and electrical configuration for serial G61008.
What hydraulic fluid specifications are recommended for the Komatsu H135S-1?
Komatsu Genuine Lubricants are formulated to meet strict Komatsu Engineering Standards. Recommended hydraulic oil includes Komatsu HO56 (ISO VG46, DIN 51524 Part 2, class HLP) or equivalent high-quality hydraulic oil meeting Komatsu specifications. Powertrain oil recommendations include Komatsu TO10 (SAE 5W-30) or TO30 (SAE 30W). Axle oil recommendations include Komatsu AXO80 (SAE 80WZF). Coolant recommendations include Komatsu Super Coolant AF-NAC. Always use fluids that meet or exceed Komatsu Engineering Standards for long component life and machine reliability. Verify specific fluid capacities and types with the machine's operation and maintenance manual.
What safety-critical fixes or inspections are emphasized for the H135S-1?
Regular inspection and maintenance of the main safety valve are critical for smooth operation of the entire hydraulic system. Failure to maintain proper track tension can lead to derailment or excessive wear. Overheating engines pose a risk of fire or catastrophic engine failure; ensure cooling packages are clean and coolant levels are correct. Electrical faults causing random shutdowns can create unsafe operating conditions; verify battery, grounds, and connectors. Hydraulic leaks under pressure can cause injury; inspect lines and cylinders regularly. Swing brake release system and mechanical play in the upper structure must be checked to prevent drift or uncontrolled movement. Have your dealer verify all safety-critical systems and repairs for the Komatsu H135S-1 (S/N G61008) to ensure compliance with factory safety protocols.
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 H135S-1(S/N G61008). Related factory variants of the same model family:
H135S-1(S/N G61027)H135S-1(S/N G61064)H135S-1(S/N G61001)H135S-1(S/N G61007)H135S-1(S/N G61045)H135S-1(S/N G61026)H135S-1(S/N G61033)
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