Komatsuhydraulic shovels(no series)
Komatsu H135S-1(S/N G61001)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu H135S-1 is a roughly 140-tonne class hydraulic mining shovel, a design originated by Demag and carried into the Komatsu line after the 1996 Komatsu-Demag mining shovel joint venture and Komatsu's full takeover of the business in 1999. Built as a front-loading face shovel for hard-rock and overburden production loading, it runs a Cummins VTA28-C-800 V12 diesel rated at roughly 540 to 565 kW (725 to 760 hp) at 1800 rpm, a mechanical PT-fuel-system engine that predates electronic engine control and is monitored through gauges and warning lamps rather than diagnostic fault codes. Operating weight for this line runs around 140,000 kg (about 308,600 lb) depending on boom, stick, and bucket configuration, with bucket capacities offered from roughly 3.1 to 9.6 cubic meters (4 to 12.5 cubic yards) and multiple boom/stick length combinations built to match dig depth and reach needs at a given pit. The H135S-1 sits in the lower-weight end of the Demag/Komatsu H-series shovel family, which scaled the same basic hydraulic-shovel architecture up through larger H-series classes.
Units carrying the G-prefix serial run, including this G61001 machine and its immediate G610xx sibling serials, represent sequential running-change points within one H135S-1 production block rather than distinct model variants; no source ties a unique spec sheet to this exact serial, so service data at the model-line level applies here. Komatsu re-branded the former Demag mining shovel range under its Germany-based mining division in the late 1990s, and as newer PC-series mining shovels and Super Shovel variants entered the lineup through the 2000s, the H-series name was phased out of new production, though sources do not document a single named model that directly replaced the H135S-1. In the used and parts market today, surviving H135S-1 units are valued as rebuildable production shovels for operators still running older Demag-heritage fleets. Because the Cummins VTA28-C-800 engine and hydraulics predate electronic controls, these machines are straightforward to keep running without OEM diagnostic tooling, and undercarriage, swing system, and hydraulic pump/motor components remain the highest-demand parts categories for machines of this age and class.
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 G61001) specifications
Engine
| Engine model | VTA28-C-800 (Cummins-based V12, part of the H135S-1 engine lineup) |
| Gross power | 543 kW (728 hp) at 1800 rpm |
| Net power | 543 kW (728 hp) at 1800 rpm |
| Displacement | 28.0 L (1709 cu in) |
| Cylinders | 12, V-configuration, turbocharged |
| Emissions tier | Not published for this range — verify with your dealer |
Weights
| Operating weight | 140,000 kg (308,647 lb), reference class weight for the H135S-1 range; varies by front (shovel vs backhoe) and boom/stick configuration |
| Shipping weight | Not documented for this serial range — verify with your dealer |
| Ground pressure | 202 kPa (29.3 psi) |
Dimensions
| Width over tracks | 5.12 m (16.8 ft) |
| Track length on ground | 4.91 m (16.1 ft) |
| Track shoe width | 600 mm (23.6 in) |
| Height to top of cab | 6.25 m (20.5 ft) |
| Tail swing radius | 4.97 m (16.3 ft) |
| Ground clearance | 0.78 m (2.55 ft) |
| Counterweight removal clearance | 1.93 m (6.32 ft) |
| Boom/stick options | 8.0 m boom / 3.6 m stick, or 12.0 m boom / 3.6 m stick |
Performance
| Max travel speed | 2.4 km/h (1.5 mph) |
| Swing speed | 6.2 rpm |
| Max digging depth | 8.2 m (26.9 ft) with short boom/stick combination; varies by boom/stick configuration |
| Max reach at ground level | 14.0 m (45.9 ft) with long boom/stick; shorter shovel-front configurations give reduced reach near 11.6 m (38.1 ft) |
| Max cutting/dump height | 14.7 m (48.2 ft) backhoe configuration; shovel-front dump height runs lower, near 9.7 m (31.8 ft) |
| Bucket capacity | Reference bucket 9.6 m3 (12.5 yd3), with a working range of roughly 3.1-9.6 m3 (4-12.5 yd3) depending on front and bucket selection |
Service capacities (summary)
| Fuel tank | 1800 L (475.6 gal) |
| Hydraulic system | 1610 L (425.4 gal) |
| Hydraulic pump flow | 1650 L/min (435.9 gpm) |
| Hydraulic relief valve pressure | 31 MPa (4495 psi) |
| Engine oil | Not documented for this serial range — verify with your dealer |
| Cooling system | Not documented for this serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
H135S-1(S/N G61001) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (incl. filter) — Cummins VTA28-C-800, V12 turbocharged diesel, 728 hp (543 kW) at 1800 rpm | Not published for this serial range. Family-wide VTA28-series oil system volume runs roughly 60 to 100 L (16 to 26 US gal) depending on pan and filtration configuration — confirm exact fill against the engine data plate or with a dealer before service. | Komatsu Genuine engine oil (EO/EOS line) or equivalent meeting API CI-4/CH-4, SAE 15W-40 for temperate climates; drop to SAE 10W-30 below 0°C (32°F) per cold-weather guidance. |
| Cooling system | Not documented for this exact serial range — verify with your dealer. | Komatsu Genuine year-round coolant (ethylene-glycol base) or equivalent meeting the engine maker's spec; hold a 50/50 antifreeze-to-water mix, richer glycol ratio for sub-zero operation. |
| Fuel tank | 1,800 L (475.6 US gal) | Diesel fuel No. 2-D (ASTM D975) or equivalent for normal ambient; switch to No. 1-D / arctic-grade diesel below -10°C (14°F) to prevent gelling. |
| Hydraulic system (tank plus circuit, total) | 1,610 L (425.4 US gal) total system fill | Komatsu Genuine hydraulic oil, HO line, ISO VG46 equivalent for standard ambient; ISO VG32 grade for cold-region or low-temperature startup service. |
| Swing (slew) drive gear case | Not documented for this exact serial range — verify with your dealer. | Komatsu Genuine powertrain/gear oil (TO line) or equivalent API GL-5 extreme-pressure gear oil, SAE 80W-90. |
| Travel (final drive) gear case, each side | Not documented for this exact serial range — verify with your dealer. | Komatsu Genuine powertrain/gear oil (TO line) or equivalent API GL-5 extreme-pressure gear oil, SAE 80W-90. |
| Grease points (boom/stick/bucket pins, bushings, slew ring gear) | Per-fitting service; no bulk reservoir. Central auto-lube system if fitted feeds from a bulk grease container sized to that option. | Komatsu Genuine grease, G2-LI lithium EP2 (NLGI 2) for general pin and bushing points; extreme-pressure moly-fortified grease for the slew ring gear teeth. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu H135S-1(S/N G61001) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 8,000 h |
|
Servicing the H135S-1(S/N G61001) beyond the schedule
Predictive Maintenance and Fluid Analysis
With no ECM on the Cummins VTA28-C-800, fluid sampling is the main early-warning tool on this shovel. Pull engine oil, hydraulic oil, and swing/final drive gear oil samples on a fixed schedule and track wear-metal trends rather than waiting for a visible leak or noise. Given the large hydraulic reservoir on this class of shovel, treat hydraulic sample results as the lead indicator for pump, motor, and cylinder condition. Log gauge readings and track chain wear measurements manually since there is no onboard telematics to flag drift.
Corrective and Common Repairs
Expect frequent bucket teeth, adapter, and cutting-edge wear from face-shovel digging cycles, plus boom, stick, and bucket pin/bushing wear from the load-and-swing duty cycle. Swing gear and slew ring wear accelerates with constant dig-swing-dump motion, so listen for play or chatter during rotation. The PT fuel system on the VTA28-C-800 needs periodic pump and injector service by a Cummins-trained technician; fuel contamination from field refueling is a common root cause of PT pump complaints on this engine.
Overhaul and Rebuild Points
Major rebuild candidates on this machine are the undercarriage (chains, rollers, idlers, sprockets worn by abrasive mining ground), the slew ring/swing bearing once gear teeth or bolt-hole wear reach limits, and the main hydraulic pumps and swing/travel motors. The VTA28-C-800 is a rebuildable mechanical engine; plan inframe or major overhaul around measured oil-analysis trends rather than a fixed hour number. Inspect boom, stick, and bucket weldments for fatigue cracking at every major service given the structural loading of shovel-front digging.
Seasonal and Environment Servicing
Pit dust loads accelerate air filter and cooling-core service intervals; check and clean radiator and oil cooler fins more often in dry, dusty operations to protect the VTA28-C-800 from overheating. In cold climates, plan on block heaters and starting aids since this mechanical engine has no electronic cold-start assist. Shorten grease intervals on boom, stick, bucket, and swing-bearing pins in extreme heat or cold, and drain fuel/water separators more often during wet-season operation to keep water out of the PT fuel system.
H135S-1(S/N G61001) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 692 306 | By-Pass - Oil Filter Cartridge, Diesel Engine | Lubrication service | Check fitment → |
| 691 865 | Filter Insert (Paper) - Return Oil Filter - Leakage | Lubrication service | Check fitment → |
| 414 024 40 | Return Oil Filter (H65, H135) (H65, H135) A = 375 | Lubrication service | Check fitment → |
| 358 601 40 | Return Oil Filter, Assembly | Lubrication service | Check fitment → |
| 202 702 40 | Sealing Element | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
H135S-1(S/N G61001) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| ENGINE OIL PRESSURE (warning lamp) | Engine lube oil pressure below safe minimum | Low oil level, worn oil pump, clogged suction screen, or failed pressure sender | Shut engine down immediately, check oil level and pressure sender before restart |
| COOLANT TEMPERATURE (warning lamp) | Engine coolant temperature above safe limit | Low coolant, blocked radiator core, failed fan drive, or thermostat stuck closed | Idle down, check coolant level and radiator/fan for debris once safe to open |
| CHARGE / ALTERNATOR (warning lamp) | Battery not receiving charge from alternator circuit | Broken drive belt, failed alternator, or loose/corroded charging circuit wiring | Check belt tension and alternator output with engine running |
| AIR FILTER RESTRICTION (warning lamp) | Intake air filter restriction exceeds set limit | Clogged primary or secondary air element | Inspect and service air cleaner element, reset restriction indicator |
| HYDRAULIC OIL TEMPERATURE (warning lamp) | Hydraulic tank oil temperature above safe operating range | Low hydraulic oil level, clogged oil cooler fins, or failed cooler fan | Reduce work rate, check oil level and cooler for blockage once cooled |
| HYDRAULIC FILTER BYPASS (warning lamp) | Return-line hydraulic filter differential pressure exceeds bypass threshold | Loaded/clogged return filter element or cold, high-viscosity oil at start-up | Replace filter element per service interval; recheck after oil warms up |
| FUEL FILTER RESTRICTION (warning lamp) | Fuel filter differential pressure indicates restriction | Loaded fuel filter element or water/contamination in fuel | Drain water separator and replace fuel filter element |
| LOW FUEL LEVEL (warning lamp) | Fuel tank level below reserve threshold | Tank near empty, or float sender fault | Refuel; check sender if lamp stays on after refueling |
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 G61001) attachments & work tools
Face shovel (loading) bucket
Primary work tool for this class, mounted in the front-shovel arrangement for bench loading. Rated capacity runs roughly 9.5 to 13.5 yd3 (about 7.3 to 10.3 m3) depending on source and bucket profile, adjustable down toward 4 yd3 (about 3 m3) for harder digging or denser material. Treat the exact figure as varying by configuration/series.
Backhoe / mass-excavation bucket
The same base machine is also offered in a backhoe front-end arrangement for trenching, bench cleanup, and mass excavation work below grade. In this arrangement typical bucket sizing is smaller than the face-shovel bucket, around 9.5 yd3 (about 7.3 m3), with reach and depth set by the boom/stick combination fitted.
Boom and stick arrangement options
Factory offers multiple boom/stick combinations rather than a single fixed front end: a shorter mass-excavation boom/stick pairing for higher breakout force and closer-in loading, plus longer reach-boom pairings with progressively longer sticks. Across these combinations dig reach spans roughly 14 to 20.8 m (46 to 68 ft) and dig depth spans roughly 8.2 to 14.6 m (27 to 48 ft), trading reach and depth against digging force.
GET and lip wear package
Bucket lips on both the face-shovel and backhoe buckets take a genuine Komatsu ground-engaging-tool package: teeth and adapters, lip shrouds, cutting edges, and side/corner wear protection. These wear items are the routine field-replaceable componentry for this bucket class and are sized to the specific bucket lip fitted, not interchangeable across unrelated bucket families.
Bucket/attachment mounting
Buckets on this shovel class are pin-mounted directly to the stick and linkage through heavy structural pins and bushings rather than through a hydraulic quick-coupler. Changing the bucket or front-end arrangement is a pin-pull job typically done with crane support, consistent with practice across large mining-class hydraulic shovels/excavators rather than a routine tool-carrier swap.
Hydraulic breaker (rock breaker) attachment
Komatsu's genuine hydraulic breaker line can be fitted to large excavators of this size class in place of the bucket for boulder breaking or secondary reduction. Running a breaker requires an auxiliary hydraulic breaker circuit (dedicated piping and control valving) that is not part of the standard loading-bucket hydraulic arrangement, so it is an added kit rather than a bolt-on option.
Undercarriage and swing common to all front-end options
Track shoe width (about 600 mm / 23.6 in) and track gauge (about 4.25 m / 13.95 ft) are fixed machine-base specifications that do not change with the front-end/bucket arrangement selected. Swing speed and travel speed are likewise unaffected by which bucket or boom/stick combination is fitted.
All H135S-1(S/N G61001) assemblies by section
Every catalogued assembly group for the Komatsu H135S-1(S/N G61001). 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 G61001) : * = Variations From Page : : Manifold Fig-No : 02 Not Applic.
| 00***98 | Mounting Clip | 6 |
| 00***98 | Mounting Clip | 7 |
| 00***98 | Mounting Clip | 6 |
Komatsu : H135s-1(S/N G61001) : * = Variations From Page : : Pipe Assy. Fig-No : 06
| 00***98 | Mounting Clip | 6 |
| 00***98 | Mounting Clip | 7 |
| 00***98 | Mounting Clip | 6 |
Komatsu : H135s-1(S/N G61001) : * = Variations From Page : : Pipe Assy. Fig-No : 09
| 00***98 | Mounting Clip | 6 |
| 00***98 | Mounting Clip | 7 |
| 00***98 | Mounting Clip | 6 |
Annex
Komatsu : H135s-1(S/N G61001) : Annex : Colour : Yellow
Komatsu : H135s-1(S/N G61001) : Annex : Electric Schematic
Komatsu : H135s-1(S/N G61001) : Annex : Hydraulic Schematic
Komatsu : H135s-1(S/N G61001) : Annex : Tools And Accessories
Bullclam Bucket Equipment
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Boom 5,0 M
| 00***98 | Mounting Clip | 6 |
| 00***98 | Mounting Clip | 7 |
| 00***98 | Mounting Clip | 6 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Bullclam Bucket, Cylinders
| 00***98 | Grease Nipple | 2 |
| 00***98 | Half Flange | 16 |
| 00***98 | Half Flanged | 4 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Hydr. Cylinder
| 00***98 | Grease Nipple | 3 |
| 20***40 | Seal | 1 |
| 20***40 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Hydraulic Cylinder
| 00***98 | Grease Nipple | 3 |
| 08***40 | Seal Kit | 1 |
| 18***40 | Stripper | 1 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Hydraulic Cylinder (S)
| 00***98 | O-Ring | 1 |
| 00***98 | Grease Nipple | 3 |
| 20***40 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Pipes, Bucket Cylinder, L.H.
| 00***98 | O-Ring | 2 |
| 30***99 | Bolt | 2 |
| 31***99 | Screw | 8 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Pipes, Bucket Cylinder, R.H.
| 00***98 | O-Ring | 2 |
| 30***99 | Bolt | 2 |
| 31***99 | Screw | 8 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Piping, Basic Boom Cylinder
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Piping, Basic Boom Cylinder L.H. (S)
| 00***98 | O-Ring | 2 |
| 00***98 | O-Ring | 1 |
| 30***99 | Screw | 6 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Piping, Basic Boom Cylinder R.H. (S)
| 00***98 | O-Ring | 2 |
| 00***98 | O-Ring | 1 |
| 30***99 | Screw | 6 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Stick 3,9 M
| 00***98 | Mounting Clip | 4 |
| 00***98 | Mounting Clip | 6 |
| 00***98 | Mounting Clip | 2 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : Stick Cylinder With Pipes
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 1 |
| 11***40 | Pipe Bracket | 1 |
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : And Piping
Komatsu : H135s-1(S/N G61001) : Bullclam Bucket Equipment : R.H.
Drive
Komatsu : H135s-1(S/N G61001) : Drive
Komatsu : H135s-1(S/N G61001) : Drive : -Air Cleaner
| 30***99 | Bolt | 20 |
| 30***99 | Lock Washer | 22 |
| 33***99 | Nut | 22 |
Komatsu : H135s-1(S/N G61001) : Drive : -Engine
| 48***40 | Engine, Assembly | 1 |
| 50***98 | V-Belt | 2 |
| 69***06 | By-Pass - Oil Filter Cartridge, Diesel Engine | 1 |
Komatsu : H135s-1(S/N G61001) : Drive : -Fan Pump
| 25***40 | Plug | 1 |
| 31***99 | Screw | 4 |
| 31***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61001) : Drive : -Main Pump
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 2 |
| 17***40 | Plug | 2 |
Komatsu : H135s-1(S/N G61001) : Drive : -Pump Distributor Gear
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 4 |
| 08***54 | O-Ring | 2 |
Komatsu : H135s-1(S/N G61001) : Drive : -Radiator
| 00***98 | Clamp | 2 |
| 30***99 | Screw | 20 |
| 31***99 | Plug | 6 |
Komatsu : H135s-1(S/N G61001) : Drive : Air Cleaning System
| 00***98 | Bolt | 16 |
| 00***98 | Hose Clip | 8 |
| 14***40 | Maintenance Switch | 2 |
Komatsu : H135s-1(S/N G61001) : Drive : Cold Start System
| 30***99 | Bolt | 2 |
| 30***99 | Bolt 25 mm Lg | 2 |
| 30***99 | Screw | 4 |
Komatsu : H135s-1(S/N G61001) : Drive : Drive, Cu
| 00***98 | Bolt | 6 |
| 00***98 | Bolt | 16 |
| 14***40 | Dust Cap | 1 |
Komatsu : H135s-1(S/N G61001) : Drive : Engine :
Komatsu : H135s-1(S/N G61001) : Drive : Exhaust System, Cu
| 22***40 | Muffler | 2 |
| 24***40 | Extension | 2 |
| 25***40 | Plate | 2 |
Komatsu : H135s-1(S/N G61001) : Drive : Fan Mounting - Radiator
| 00***98 | Union | 2 |
| 30***40 | Disc | 2 |
| 30***99 | Bolt 25 mm Lg | 4 |
Komatsu : H135s-1(S/N G61001) : Drive : Fuel Lines
| 23***40 | Ball Cock | 1 |
| 23***40 | Hose Fittings | 1 |
| 25***40 | Hose Dn 12 X Ca. 4000 Lg. Bulk Ware, State Length Required | 1 |
Komatsu : H135s-1(S/N G61001) : Drive : Lines For Radiator, Cu
| 00***98 | Clamp | 2 |
| 00***98 | Clamp | 8 |
| 00***98 | Clamp | 8 |
Komatsu : H135s-1(S/N G61001) : Drive : Output :
Komatsu : H135s-1(S/N G61001) : Drive : Pump And Distributor Gear
| 00***98 | Union | 1 |
| 26***40 | Hose Fittings | 2 |
| 30***99 | Bolt | 12 |
Komatsu : H135s-1(S/N G61001) : Drive : Radiator Arr.
| 00***98 | Union | 2 |
| 08***80 | Hinge Pin | 4 |
| 12***40 | Base | 1 |
Komatsu : H135s-1(S/N G61001) : Drive : Serial-No. :
Komatsu : H135s-1(S/N G61001) : Drive : Series :
Komatsu : H135s-1(S/N G61001) : Drive : Suction Lines
| 00***98 | O-Ring | 1 |
| 26***40 | Hose Fittings | 5 |
| 30***99 | Bolt 35 Lg | 12 |
Komatsu : H135s-1(S/N G61001) : Drive : Arrangement
Electric
Komatsu : H135s-1(S/N G61001) : Electric : Battery Cables
| 00***98 | Pipe Clamp, Rubber Armed | 8 |
| 14***40 | Cable Shoe | 8 |
| 30***99 | Screw | 4 |
Komatsu : H135s-1(S/N G61001) : Electric : Cables - Cabin Pedestal
| 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 G61001) : 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 G61001) : 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 G61001) : Electric : Electric System
| 25***40 | Housing, Empty | 2 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Electric : 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 G61001) : 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 G61001) : Electric : Operation Panel
Komatsu : H135s-1(S/N G61001) : Electric : Switch Box - Engine
| 05***40 | Cable Union | 1 |
| 27***40 | Connector Socket | 1 |
| 32***99 | Screw | 4 |
Komatsu : H135s-1(S/N G61001) : Electric : Warning System
| 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 G61001) : Electric : Wire Layout - Engine, Cu
| 05***40 | Cable Lug, Red | 15 |
| 35***40 | Cable Protection Hose Pg 21 Pg 21x1400 Lg. Bulk Ware, State Length Required | 3 |
| 35***40 | Socket Pg 21 | 6 |
General View
Komatsu : H135s-1(S/N G61001) : General View : General View Bullclam Bucket Equipment
Komatsu : H135s-1(S/N G61001) : General View : General View Drive
Komatsu : H135s-1(S/N G61001) : General View : General View Electric
Komatsu : H135s-1(S/N G61001) : General View : General View Hydraulic
Komatsu : H135s-1(S/N G61001) : General View : General View Lubrication System
Komatsu : H135s-1(S/N G61001) : General View : General View Operator'S Cab
Komatsu : H135s-1(S/N G61001) : General View : General View Shovel
Komatsu : H135s-1(S/N G61001) : General View : General View Superstructure
Komatsu : H135s-1(S/N G61001) : General View : General View Undercarriage
Komatsu : H135s-1(S/N G61001) : General View : Machine-Maintenance Parts
| 25***40 | O-Ring, H.P. Element Lubrication + Cooling | 3 |
| 26***40 | Air Cleaner, Cabin Supercharger | 1 |
| 50***98 | O-Ring | 3 |
Heater And Air Condit. Equipment
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Heater And Air Condit. Equipment : Hot-Water-Heater
| 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 G61001) : Hydraulic
Komatsu : H135s-1(S/N G61001) : 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 G61001) : 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 G61001) : Hydraulic : -Control Blocks
| 00***98 | O-Ring | 20 |
| 16***40 | Release Valve | 6 |
| 31***99 | Eye Bolt | 2 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : 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 G61001) : Hydraulic : -H.P. Filter For Gear Oil
| 00***98 | O-Ring | 1 |
| 25***40 | O-Ring, H.P. Element Lubrication + Cooling | 1 |
| 41***40 | H.P. Filter Assembly | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : -Load Limitation Valve
| 17***40 | Plug | 3 |
| 33***99 | Nut | 1 |
| 41***40 | Load Limitation Valve Assembly. For H 65 / H 135 | 1 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Hydraulic : Add. Parts Bullclam Bucket Control
| 00***98 | O-Ring | 2 |
| 00***98 | Union | 1 |
| 21***99 | Pipe ? 10x270 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Hydraulic : Control Blocks - Rotary Joint
| 00***98 | Half Flange | 8 |
| 00***98 | Union | 1 |
| 17***40 | Union | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Control Blocks - Swing Gear
| 00***98 | Half Flanged | 4 |
| 00***98 | Half Flange | 4 |
| 00***98 | Union | 1 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Hydraulic : Filter And Valve Arrangement
Komatsu : H135s-1(S/N G61001) : Hydraulic : Hydr. Oil Cooler
| 00***98 | Test Socket | 1 |
| 00***98 | Half Flange | 2 |
| 00***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Hydraulic Control
| 00***98 | Socket | 1 |
| 00***98 | Union | 1 |
| 12***40 | Retainer | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Lines - Manifold - Basic Boom
| 00***98 | Half Flanged | 10 |
| 30***99 | Bolt | 20 |
| 31***99 | Screw | 40 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Hydraulic : Pilot Oil Units, R.H. Top, R.H. Lower And L.H.
| 00***98 | Union | 12 |
| 25***40 | Hose Fittings | 12 |
| 25***40 | Hose Fittings | 0 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Piping - Control Blocks - Manifold
| 00***98 | O-Ring | 4 |
| 00***98 | O-Ring | 24 |
| 00***98 | Union | 4 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Pump Bearing Lubrication With
| 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 G61001) : Hydraulic : Pump Bearing, Lubrication And Pump Control
| 00***98 | Test Union | 1 |
| 00***98 | Union | 1 |
| 00***98 | Socket | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Throttle Check Valve
| 08***40 | O-Ring | 1 |
| 17***40 | Screw Plug | 1 |
| 25***40 | Valve Disk | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Transmission - Oil Cooler
| 00***98 | Socket | 1 |
| 00***98 | Union | 1 |
| 08***40 | Pressure Relief Valve (10 Bar) | 1 |
Komatsu : H135s-1(S/N G61001) : Hydraulic : Expansion Tank
Lubrication System
Komatsu : H135s-1(S/N G61001) : Lubrication System : -Grease Gun
| 69***25 | Grease Gun, Assembly | 1 |
| 69***73 | Coupling With Pipe | 1 |
| 69***73 | Extension | 1 |
Komatsu : H135s-1(S/N G61001) : Lubrication System : -Pump
| 69***63 | Seal Kit Fig-Nos. 04,13,16,28-30,39, 44,60 And 69 | 1 |
| 69***25 | Lube Pump Assembly. (For Barrel 50 L Only) | 1 |
| 69***72 | Lube Pump, Assembly. (Valid For 24 L Barrel) | 1 |
Komatsu : H135s-1(S/N G61001) : Lubrication System : Grease Pump Arrangement
| 00***98 | Locking Spring | 1 |
| 37***99 | Union | 1 |
| 37***99 | Union | 1 |
Komatsu : H135s-1(S/N G61001) : Lubrication System : 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 G61001) : 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 G61001) : Operator'S Cab : Colour : Papyrus White
Komatsu : H135s-1(S/N G61001) : Operator'S Cab : Cover
| 19***40 | Shackle | 6 |
| 23***40 | Hinge To Fig-Nos. 10,11,22 | 1 |
| 25***40 | Interior Lock Handle | 1 |
Komatsu : H135s-1(S/N G61001) : Operator'S Cab : Ladder
| 18***40 | Limit Switch | 1 |
| 30***99 | Cable Clamp | 2 |
| 30***99 | Bolt | 1 |
Komatsu : H135s-1(S/N G61001) : Operator'S Cab : Ladders
| 30***99 | Screw | 15 |
| 30***99 | Screw | 6 |
| 30***99 | Screw | 0 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Operator'S Cab : Operator'S Cab Arrangement
| 08***40 | Mirror | 2 |
| 11***40 | Mirror Bracket, R.H | 1 |
| 16***40 | Profiled Joint Ca. 6000 Lg. Bulk Ware, State Length Required | 0 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : 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 G61001) : 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 G61001) : 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 G61001) : 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 G61001) : 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 G61001) : 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 G61001) : Operator'S Cab : Rail And Gratings
| 26***40 | Pin | 5 |
| 30***99 | Lock Washer | 16 |
| 30***99 | Screw | 0 |
Komatsu : H135s-1(S/N G61001) : Operator'S Cab : Windscreen Washing Assy.
| 05***40 | Wiper Motor 120? | 1 |
| 19***40 | Diaphragm Pump | 1 |
| 19***40 | Water Reservoir | 1 |
Superstructure
Komatsu : H135s-1(S/N G61001) : Superstructure : -Fan Motor
| 31***99 | Screw | 2 |
| 31***99 | Screw | 4 |
| 34***99 | Shim Washer 85x105x0,3 | 1 |
Komatsu : H135s-1(S/N G61001) : Superstructure : -Filter
| 33***99 | Nut | 1 |
| 44***40 | Aeration Filter, Assembly | 1 |
| 69***89 | Socket Housing | 1 |
Komatsu : H135s-1(S/N G61001) : Superstructure : -Pressure Relief Valve
| 31***99 | Plug | 1 |
| 31***99 | Eyebolt | 2 |
| 31***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61001) : Superstructure : -Return Oil Filter
| 10***65 | O-Ring | 1 |
| 33***99 | Nut | 2 |
| 33***99 | Nut | 1 |
Komatsu : H135s-1(S/N G61001) : Superstructure : Fan Mounting, Oil Cooler
| 30***99 | Screw | 10 |
| 30***99 | Bolt | 4 |
| 32***40 | Locking Plate | 3 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : 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 G61001) : Superstructure : Oil Tank
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 1 |
| 00***98 | O-Ring | 1 |
Komatsu : H135s-1(S/N G61001) : Superstructure : Platform With Counterweight
| 13***40 | Pin | 2 |
| 21***40 | Bolt Lock | 4 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : 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 G61001) : 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 G61001) : Swing Ring : -Swing Gear Box
| 30***99 | Screw | 12 |
| 31***99 | Plug | 2 |
| 31***99 | Bolt | 6 |
Komatsu : H135s-1(S/N G61001) : Swing Ring : Lube Arrangement
| 00***98 | Grease Nipple | 32 |
| 21***99 | Pipe ? 10x270 Lg. Bulk Ware, State Length Required | 0 |
| 31***99 | Screw | 64 |
Komatsu : H135s-1(S/N G61001) : Swing Ring : Swing Ring
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Undercarriage
Komatsu : H135s-1(S/N G61001) : Undercarriage : -Chain
| 44***40 | Track (H135-47 Links) | 1 |
| 69***25 | Spacer | 4 |
| 69***73 | Track Bush | 94 |
Komatsu : H135s-1(S/N G61001) : 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 G61001) : Undercarriage : -Top Roller
| 18***40 | Sliding Ring Seal | 1 |
| 30***99 | Bolt | 3 |
| 30***99 | Screw | 2 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : -Track Roller
| 00***98 | O-Ring | 1 |
| 11***40 | Bottom Roller Assembly | 1 |
| 14***40 | Lifetime Seal | 2 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : -Traction Transmission
| 00***98 | O-Ring | 1 |
| 20***40 | Mechanical Seal | 2 |
| 30***99 | Bolt | 15 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Grease Tensioning Cylinder
| 18***40 | Wiper | 1 |
| 18***40 | V-Seal | 1 |
| 18***40 | Piston Ring | 2 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Hydraulic
| 00***98 | Half Flanged | 8 |
| 00***98 | Half Flange | 8 |
| 00***98 | O-Ring | 4 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Idler Assy.
| 00***98 | O-Ring | 2 |
| 18***40 | Lifetime Seal | 2 |
| 18***40 | Lifting Beam | 1 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Nitrogen Cylinder
| 20***40 | Plug | 1 |
| 20***40 | Piston Ring | 2 |
| 20***40 | Piston Ring | 1 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Rotary Joint
| 16***40 | Screw Plug | 4 |
| 20***40 | Screw Plug | 1 |
| 30***99 | Bolt | 4 |
Komatsu : H135s-1(S/N G61001) : Undercarriage : Undercarriage
| 17***40 | Union | 1 |
| 25***40 | Hv-Washer | 36 |
| 25***40 | Hv-Washer | 48 |
H135S-1(S/N G61001) serial number reference
On this shovel the product identification plate is riveted inside the operator's cab, usually on the cab frame or console near the operator's seat, with a duplicate stamped into the upper frame/car body structure near the swing bearing. Read it as a single letter (G) followed by a 5-digit running serial (no dash), e.g. G61001; unlike Komatsu's Japan-built machines there is no multi-letter regional code to decode, just the sequential production number used to pick the correct running-change level in the parts book.
| Prefix | Identifies | Notes |
|---|---|---|
| G | H135S-1 hydraulic mining shovel, Komatsu Mining Germany (Dusseldorf, ex-Mannesmann Demag) production block | Serials for this family run as G plus a 5-digit number (e.g. G61001) rather than the alphanumeric PIN scheme used on Komatsu's Japan-built construction line. Parts-book breakpoints exist at S/N 61001, 61008, 61026, 61027, 61033, 61045 and 61064, which read as sequential running-change points in one production series, not separate lettered variant families. No source found decodes the G prefix itself (plant code vs. shovel-class code) or ties any of the other breakpoints to a distinct engine, configuration, or region — confirm with dealer before treating them as anything other than running changes. |
Frequently asked questions
What engine powers the Komatsu H135S-1 (S/N G61001)?
A Cummins VTA28-C-800, a mechanical V12 diesel with a PT fuel system rated at roughly 540 to 565 kW (725 to 760 hp) at 1800 rpm. It predates electronic engine control, so it is monitored by gauges and warning lamps rather than diagnostic fault codes.
What is the operating weight of the Komatsu H135S-1 (S/N G61001)?
Approximately 140,000 kg (about 308,600 lb) in typical configuration. Exact weight varies by boom, stick, and bucket combination fitted.
What replaced the Komatsu H135S-1?
Sources do not document a single named direct successor for this exact model. Komatsu phased the Demag-heritage H-series mining shovel range out of new production through the 2000s as its PC-series mining shovels and Super Shovel variants expanded; check with a Komatsu dealer for the current equivalent-class recommendation.
What H135S-1(S/N G61001) owners discuss
What engine is actually in the H135S-1 and what do owners flag about it?
This shovel is built around a Cummins VTA28-C V12, turbocharged and aftercooled, rated in the 540-565 kW (725-760 hp) range at 1800 rpm depending on the rating sheet consulted - the same base engine used across this weight class of Komatsu-Demag shovel. It runs a mechanical PT (pressure-time) fuel system, not an electronic ECM. Field consensus is that the PT pump and injectors are tough but sensitive to fuel cleanliness - dirty fuel or contaminated tanks are the most common cause of hard starting, rough running, or loss of power. Keep filtration tight and tanks/lines clean rather than chasing electronics that this engine simply doesn't have.
How does the hydraulic system tend to behave over time?
The shovel runs a high-pressure twin-circuit system, with relief settings around 310 bar (4,500 psi) and pump flow in the 1,600 L/min (430 gal/min) class - enough to move a 140 t class machine through independent boom and arm functions. Owners of this generation of mining shovel report that leaks show up first at hose fittings and cylinder rod seals under sustained high-cycle duty, and that cooler fins clogging with mine dust is a common cause of gradual heat buildup rather than any single component failure. Regular cooler cleaning and hose/fitting inspection head off most of this. Any relief valve or pressure adjustment work should be left to a qualified technician - have your dealer verify settings before returning the machine to service.
What undercarriage wear pattern is typical for this size of shovel?
With a ground pressure around 200 kPa (29 psi) spread over roughly 600 mm (23.6 in) wide shoes and a long track base, this class of low-ground-pressure mining shovel is built to spread a heavy operating weight - around 140 t - over soft or uneven pit floors. The recurring theme from operators of similar Demag/Komatsu shovels is that track pads, rollers, and idlers are the main undercarriage cost driver on high-hour machines, and that shoe bolt looseness and track sag are the first things to check rather than waiting for visible pad wear. Undercarriage condition is one of the biggest swing factors in resale value on this class of machine.
Are there known engine quirks specific to this series?
Because the VTA28-C fuel system is fully mechanical, there's no fault-code diagnostics to lean on - governor behavior is set and adjusted mechanically, and drift in governor calibration shows up as inconsistent idle or rated speed rather than a warning light. In dusty open-pit or quarry environments, aftercooler blockage is the most commonly cited cause of gradual overheating, since restricted airflow through the cooler core reduces charge air cooling before coolant temperature itself becomes obviously abnormal. Routine cooler cleaning and periodic governor checks are the standard preventive answer from people who run this engine family.
What electrical or sensor issues come up most?
This is a pre-electronic-control era machine, so there isn't a complex sensor network to fail - the electrical system is largely gauges, switches, and the charging circuit for lighting, cab electrics, and the auto-lube system. The complaints that recur are corroded or loose connectors causing intermittent or erratic gauge readings (especially coolant temperature and hydraulic pressure senders) after years in a wet or dusty mine environment, and charging system wear affecting battery life. Because there's no ECM to log faults, intermittent gauge behavior is usually chased down wire by wire rather than with a diagnostic scan tool.
What should be checked on the boom, stick, and pin joints?
This shovel was offered with several interchangeable boom and stick combinations - from a shorter boom set up for digging force to an extended boom-and-stick combination for reach - so confirm which configuration is actually fitted before comparing it to another listing. Across this class of shovel, pin and bushing wear at the boom foot, stick, and bucket linkage is the most common linkage complaint, along with fatigue cracking near heavily stressed weld joints on older, high-hour structures. Any cracked weld or structural repair on the boom, stick, or counterweight mounting should be assessed and repaired by a qualified structural welder - have your dealer or a certified inspector verify any structural repair before the machine goes back to work.
What should a buyer check before purchasing a used H135S-1 (S/N G61001)?
Start with engine hours and PT fuel system condition - hard starting, smoke, or power loss usually traces back to fuel cleanliness history rather than the engine itself. Check hydraulic cylinder rods for scoring and seal weeping, inspect major hose and fitting runs for past leak repairs, and ask for a swing gearbox oil sample if available. Walk the undercarriage for track pad, roller, and idler wear and check track tension/sag. Confirm which boom/stick configuration is fitted and inspect boom, stick, and counterweight mounting welds for cracks or prior repairs. Ask for cooling system and aftercooler cleaning records, since dusty-site overheating is the main engine complaint on this series. Given the age, size, and mechanical fuel system on this machine, have a qualified dealer technician verify engine, hydraulic, and structural condition before you commit to a purchase.
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 G61001). Related factory variants of the same model family:
H135S-1(S/N G61008)H135S-1(S/N G61027)H135S-1(S/N G61064)H135S-1(S/N G61007)H135S-1(S/N G61045)H135S-1(S/N G61026)H135S-1(S/N G61033)
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