Komatsu SK05-1(S/N 5418-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SK05-1 (S/N 5418-Up) is a compact wheeled loader-backhoe: a front loader arm and bucket paired with a rear excavator-style backhoe (boom, dipper, bucket, swing tower, and stabilizer legs) on a wheeled chassis, not a plain wheel loader. The hydraulic system feeds both the front loader and rear excavator circuits from a shared pump and valve bank. It was built in Italy at the former FAI plants in Noventa Vicentina and Este, during the period Komatsu absorbed the independent Italian manufacturer FAI, taking a shareholding around 1989-1991 and full ownership in 1995 before retiring the FAI name in 1997. Engine identity and certified operating weight for this exact serial range are not confirmed in available literature; it runs a mechanically-governed, non-electronic diesel typical of the period, and sibling Komatsu-Italy wheeled and crawler machines built in the same era are known to have used Perkins or Iveco engines as the closest documented reference point. Cab or canopy operator stations and stabilizer/attachment configuration are known to vary across this class.
This serial range is not static internally: the factory parts breakdown shows a running change to the backhoe work equipment and the main hydraulic control valve clustered around serial 6328-6335, so machines from opposite ends of the 5418-Up range carry different parts for those systems - always confirm against the individual chassis serial rather than the model tag alone. Komatsu also reused the SK05 model designation on a separate, differently configured production line built in Japan under its own serial range, so this Italy-built loader-backhoe and that sibling do not share parts despite the shared name. In today's used and parts market this is one of the more obscure entries in Komatsu's compact-equipment lineage: dealer stock is thin, published documentation is sparse, and support depends on matching the serial-specific parts book rather than a generic spec sheet. It matters mainly to owners of small municipal, utility, and landscaping fleets already running one, and to specialists tracing the FAI-to-Komatsu Italia manufacturing lineage.
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 SK05-1(S/N 5418-Up) specifications
Engine
| Configuration | Mechanically-governed, naturally aspirated, indirect-injection diesel with an inline injection pump — no electronic engine controller, consistent with the machine's late-1990s build era |
| Engine identity | Not confirmed for this exact serial range in available sources. Catalog parts data points to a small liquid-cooled diesel typical of this compact-equipment class; confirm the exact make and model from the machine's own data plate before ordering engine parts |
| Emissions tier | Not applicable — built in the late 1990s, predating non-road diesel emissions regulation (EU Stage I / U.S. EPA Tier 1) |
Weights
| Operating weight | Not confirmed for this exact serial range in available sources. Figures published online under the same base model number belong to a different production line and are not carried over here. Verify against the machine's own data plate or by weighing it |
Dimensions
| Transport length | approx. 2.10 m (6 ft 11 in) — single-source figure, confirm with dealer |
| Transport width | approx. 1.28 m (4 ft 2 in) — single-source figure, confirm with dealer |
| Transport height | approx. 1.53 m (5 ft 0 in) — single-source figure, confirm with dealer |
| Tires, front and rear | 27x8.5-15 — single-source figure, confirm with dealer |
Performance
| Rated operating capacity, bucket capacity, travel speed | Not confirmed for this exact serial range in available sources. Figures published online under the same base model number belong to a different production line and are not carried over here. Verify against the machine's own data plate or dealer spec sheet |
Service capacities (summary)
| Note | Fuel tank, hydraulic system, engine oil, and coolant capacities are not documented in available public sources for this exact serial range. Verify with your dealer or the factory service manual. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
SK05-1(S/N 5418-Up) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter) | Not documented in publicly indexed literature for S/N 5418-Up. This is a low-production, Italy-built 1997-1998 unit; no lubrication/capacity table for it is available online. Verify against the OEM operation & maintenance manual or a dealer parts/service book. | Komatsu-spec diesel engine oil, SAE 15W-40 for temperate to warm climates, SAE 10W-30 for cold-start service below freezing. The current equivalent factory product is Komatsu Genuine Engine Oil (EO), meeting API CI-4/CH-4 performance level. |
| Cooling system | Not documented for this serial range in available sources. Verify against dealer parts book or OMM. | Permanent-type ethylene-glycol antifreeze coolant, mixed to local climate. Current equivalent factory product is Komatsu Genuine Coolant AF-NAC. |
| Fuel tank | Not documented for this serial range in available sources. Verify against dealer parts book or OMM. | No. 2-D diesel fuel (EN590 in Europe). Use winter-grade fuel or a kerosene blend in sub-freezing climates to prevent gelling. |
| Hydrostatic/hydraulic system (travel and implement circuits, common reservoir) | Not documented for this serial range in available sources. The exact drive layout for this unit (hydrostatic vs. mechanical) is not confirmed in public literature. Verify against dealer parts book or OMM. | Anti-wear hydraulic oil. Current equivalent factory product is Komatsu Genuine Hydraulic Oil, ISO VG46 / SAE 10W for standard climates, with a lighter wide-range multigrade (SAE 5W-30, ISO VG56) offered for cold-climate service. |
| Final drives / axle differentials (if equipped) | Applicability not confirmed for this exact unit; whether it carries mechanical axle differentials or is purely hydrostatic is not documented in public sources. Verify against dealer parts book or OMM. | If mechanical axles are fitted: gear oil, SAE 80W, API GL-4. Current equivalent factory product is Komatsu Genuine Axle Oil (AXO). |
| Grease points (chassis pins, bucket/loader-arm linkage) | Spec only, no reservoir. Lubricate at scheduled intervals per grease fitting. | Multipurpose lithium-base EP grease, NLGI Grade 2. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu SK05-1(S/N 5418-Up) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the SK05-1(S/N 5418-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
Watch hydraulic oil condition closely: this loader-backhoe runs a shared pump and valve bank feeding both the front loader and rear excavator circuits, so contaminated or off-spec fluid shows up first as sluggish boom, dipper, and stabilizer response rather than sudden failure. Sample oil at each hydraulic filter change and keep the return filter on schedule. Track engine oil condition on the mechanically-governed diesel and watch for injection pump timing drift, which shows up as hard starting and light smoke before power loss becomes noticeable.
Corrective & Common Repairs
Steering slop and front-end wander trace to worn kingpin and axle-oscillation-pivot bushings from lapsed greasing, not the axle itself. Clunk on bucket-curl reversal points to loader boom pivot or bucket-linkage pin wear. The rear backhoe's swing tower and stabilizer legs take the worst abuse - grease squeezes out on one side of the pin unless the arm is cycled through full travel while greasing, so wear stays uneven even on a machine greased on schedule. Weeping rod seals and hose fittings are common leak points, worse on machines stored outdoors.
Overhaul & Rebuild Points
At rebuild time, prioritize the backhoe swing-tower bearing and stabilizer-leg bushings - persistent side-to-side slop after regreasing means they need replacing, not more grease. Rebuild kingpin, axle-pivot, and loader-arm pins as matched sets, since they wear together. Flush the hydraulic system fully, including cylinders, and replace hoses on age, not appearance. The mechanically-governed diesel needs a top-end rebuild before a bottom-end overhaul. A documented mid-run hydraulic valve and work-equipment change partway through this serial range means rebuild parts must be ordered against this unit's own serial, not a same-numbered sibling.
Seasonal & Environment Servicing
Before cold weather, confirm glow-plug preheat function - this mechanically-injected diesel starts hard below freezing without a working preheat system, and injection pump timing drift compounds the problem. Drain water from the fuel tank and check the fuel filter bowl before frost. In wet or muddy seasons, grease the loader-arm, kingpin, axle-pivot, and backhoe swing-tower/stabilizer pins more often, cycling the backhoe through full travel each time so grease reaches the loaded face and displaces moisture. Clean the radiator and air-cleaner element more often during dusty, hot-season work.
SK05-1(S/N 5418-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 333307072 | Air Filter, Assembly | Air intake service | Check fitment → |
| 885141126 | Glass, Transmission Oil Filter Clogging | Lubrication service | Check fitment → |
| YMR000114 | Filter, Assembly | Scheduled service item | Check fitment → |
| YMR000115 | Element, Assembly | Scheduled service item | Check fitment → |
| YMR000506 | Wrench, Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SK05-1(S/N 5418-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine oil pressure warning lamp | Engine lubrication oil pressure has dropped below the safe minimum | Low oil level, worn oil pump, clogged oil strainer, or failed pressure sender/switch | Stop engine immediately, check oil level and top up, inspect for leaks before restarting |
| Coolant temperature warning lamp | Engine coolant temperature has exceeded normal operating range | Low coolant level, clogged radiator fins, slipping or broken fan belt, or thermostat failure | Idle engine to cool, shut down safely, check coolant level and radiator/fan belt once cool |
| Battery charge (alternator) warning lamp | Charging circuit is not supplying current to the battery | Broken or loose alternator drive belt, failed alternator, or wiring/connector fault | Check belt tension and condition first, then test alternator output and battery connections |
| Air cleaner restriction indicator | Intake air filter element is clogged, restricting airflow to the engine | Dust/debris buildup in the air filter element over normal service life | Inspect and clean or replace the air filter element per the maintenance interval |
| Hydraulic oil filter clogging indicator | Return-line hydraulic filter is restricted, bypassing unfiltered oil | Filter element reached service life, or contaminated hydraulic oil | Replace the hydraulic filter element and check oil condition |
| Glow plug / preheat indicator lamp | Shows preheat cycle status before cold starting | Normal cold-start function; stays on longer or fails to illuminate if a glow element or relay has failed | Allow the preheat cycle to complete before cranking; if lamp behavior is abnormal, check the preheat relay and glow elements |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SK05-1(S/N 5418-Up) attachments & work tools
Standard front bucket
General-purpose dirt bucket is the primary work tool on the front loader arm of this compact wheeled loader-backhoe. Size is matched to the machine's class and loader-arm reach; a capacity figure specific to this exact serial range is not confirmed in available sources — verify against the machine's data plate or dealer parts book.
Pallet forks
Fork attachment is a common alternative to the front bucket for pallet and unit-load handling on machines this size. Load rating tracks the machine's own rated operating capacity; a figure specific to this exact serial range is not confirmed — verify with your dealer.
Rear excavator/backhoe arm
Standard equipment at the rear of the chassis: boom, dipper, bucket, slewing turret, and stabilizer legs, fed by the same hydraulic pump and valve bank as the front loader. The factory parts breakdown lists multiple digging-bucket width options and hydraulic piping for a mounted hammer/breaker; exact sizes and hammer compatibility for this serial range should be confirmed with your dealer.
Quick-attach coupler / mounting
Work tools mount to the front loader-arm ends through a quick-attach coupler frame, standard practice on compact wheeled loader-backhoes of this era, letting bucket and fork-type tools be pinned or lever-locked on without a separate hitch. The exact coupler pattern for this serial range is not confirmed in available documentation — check compatibility with your dealer or the parts book before ordering a tool.
Auxiliary hydraulics for powered attachments
Hydraulically driven tools such as an auger or sweeper/broom draw from the machine's auxiliary hydraulic circuit, fed through hose couplers at the loader-arm end. Flow and pressure on this compact loader-backhoe class sit in the standard-flow range typical of sub-2-tonne compact equipment of this vintage; exact flow/pressure figures for this specific serial range are not published — confirm against the machine data plate or dealer spec sheet before fitting a hydraulic tool.
Operator guarding
Base configuration includes a ROPS-rated operator station. A fully enclosed cab or added overhead (FOPS) guard is a common option across this equipment class for debris or overhead-hazard work, though a documented factory guarding option specific to this serial range was not found — verify current availability with your dealer.
All SK05-1(S/N 5418-Up) assemblies by section
Every catalogued assembly group for the Komatsu SK05-1(S/N 5418-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Air Intake Manifold
| 87***04 | Motor, Assembly | 1 |
| YM***01 | Gasket | 1 |
| YM***65 | Heater | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Camshaft And Driving Gear
| 87***04 | Motor, Assembly | 1 |
| YM***85 | Bushing | 1 |
| YM***07 | Screw | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Cooling Water System
| 87***04 | Motor, Assembly | 1 |
| YM***75 | Fan | 1 |
| YM***08 | Rubber | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Crankshaft And Piston
| 87***04 | Motor, Assembly | 1 |
| YM***97 | Parallel Pin | 1 |
| YM***03 | Bushing (Repair Part) | 3 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Cylinder Block
| 87***04 | Motor, Assembly | 1 |
| YM***39 | Plug | 1 |
| YM***61 | Gasket, Cylinder Head | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Cylinder Head And Bonnet
| 87***04 | Motor, Assembly | 1 |
| YM***08 | Screw | 6 |
| YM***65 | Seal, Valve Exhaust | 3 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Engine Stop Device
| 87***04 | Motor, Assembly | 1 |
| YM***00 | Bolt Plated | 4 |
| YM***29 | Foot (A) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Exhaust Manifold
| 87***04 | Motor, Assembly | 1 |
| YM***02 | Manifold, Exhaust | 1 |
| YM***76 | Gasket | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Flywheel Housing And Oil Sump
| 87***04 | Motor, Assembly | 1 |
| YM***08 | Screw | 4 |
| YM***99 | Support | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Fuel Injection Line
| 87***04 | Motor, Assembly | 1 |
| YM***85 | Pipe | 1 |
| YM***83 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Fuel Injection Pump
| 87***04 | Motor, Assembly | 1 |
| YM***29 | Plug | 1 |
| YM***24 | Camshaft | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Fuel Piping
| 87***04 | Motor, Assembly | 1 |
| YM***75 | Gasket | 2 |
| YM***61 | Pipe | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Gasket Set - Tool (Optional)
| 87***04 | Motor, Assembly | 1 |
| YM***01 | Gasket | 1 |
| YM***10 | Wrench | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Gear Housing
| 87***04 | Motor, Assembly | 1 |
| YM***96 | Pipe L=18 | 2 |
| YM***07 | Screw | 6 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Generator
| 87***04 | Motor, Assembly | 1 |
| YM***39 | Nut Assembly., Pulley | 1 |
| YM***34 | Diode Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Governor
| 87***04 | Motor, Assembly | 1 |
| YM***26 | Spring | 1 |
| YM***59 | Screw | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Lubricating Oil Pump
| 33***75 | Pipe | 1 |
| 33***76 | Support | 1 |
| 80***29 | Screw | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Starter Motor
| 87***04 | Motor, Assembly | 1 |
| YM***05 | Bearing (1) | 1 |
| YM***30 | Shaft | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Engine : Thermostat
| 87***04 | Motor, Assembly | 1 |
| YM***08 | Screw | 1 |
| YM***78 | Plug | 1 |
Excavator E20 (From Serial Number 5418 To 6328)
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Bucket (Tooth With Bolts Version)
| 20***85 | Bucket, L=300 mm | 1 |
| 20***86 | Bucket, L=400 mm | 1 |
| 20***87 | Bucket, L=250 mm | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Bucket (Welded Tooth Version)
| 20***30 | Bucket, L=250 mm | 1 |
| 20***40 | Bucket, L=300 mm | 1 |
| 20***50 | Bucket, L=400 mm | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Bucket Control Cylinder - Lifting
| 20***08 | Piston Rod | 1 |
| 50***89 | Bushing | 1 |
| 80***20 | Nut | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Control Valve (1/3)
| 80***93 | Screw | 2 |
| 80***18 | Washer | 2 |
| 80***09 | Gasket | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Control Valve (2/3)
| 80***93 | Screw | 4 |
| 80***12 | Gasket, Seal | 1 |
| 84***63 | Safety Valve, Assembly | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Control Valve (3/3)
| 80***93 | Screw | 4 |
| 80***12 | Gasket, Seal | 3 |
| 84***84 | Valve Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Dipper Control Cylinder
| 20***52 | Cylinder, Assembly | 1 |
| 50***89 | Bushing | 1 |
| 80***20 | Nut | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Excavation Group
| 50***89 | Bushing | 6 |
| 80***80 | Bolt | 10 |
| 80***24 | Screw | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Excavation Group Hydraulic System
| 80***08 | Nut (With Stabilizers Only) | 1 |
| UE***50 | Hose | 1 |
| UE***51 | Hose | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Fixed Frame And Sliding Plate
| 50***62 | Washer | 2 |
| 80***65 | Bolt | 4 |
| 80***13 | Bolt | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Hydraulic Piping Hammer (1/2)
| 20***50 | Plug | 1 |
| 20***70 | Plug (Only For Disconnecting Hammer) | 1 |
| 20***48 | Coupling, Assembly. (For Hammer On Plate And On Excavator) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Hydraulic Piping Hammer (2/2)
| 50***02 | Bushing | 1 |
| 50***03 | Bushing | 1 |
| 50***04 | Bushing | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Main Valve Control Hydraulic System
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Main Valve Element For Hammer
| 80***93 | Screw | 2 |
| 84***92 | Spring | 1 |
| 84***01 | Kit, Docking, Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Rotation Group
| 20***07 | Housing | 1 |
| 20***11 | Rotation Group, Assembly | 1 |
| 80***94 | Bolt | 12 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Sliding Plate Hydraulic System With Hydraulic Lock
| 50***10 | Union | 1 |
| 50***08 | Elbow (For Hydraulic Lock) | 2 |
| 50***17 | Union | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E20 (From Serial Number 5418 To 6328) : Stabilizers Control Cylinder
| 80***18 | Nut | 1 |
| 86***07 | Fitting (Except Germany) | 1 |
| U2***3A | Cap | 1 |
Excavator E26 (From Serial Number 6335-)
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Bucket (Tooth With Bolts Version)
| 20***85 | Bucket, L=300 mm | 1 |
| 20***86 | Bucket, L=400 mm | 1 |
| 20***87 | Bucket, L=250 mm | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Bucket (Welded Tooth Version)
| 20***30 | Bucket, L=250 mm | 1 |
| 20***40 | Bucket, L=300 mm | 1 |
| 20***50 | Bucket, L=400 mm | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Bucket Control Cylinder
| 86***07 | Fitting (Except Germany) | 1 |
| 86***04 | Fitting (Only For Germany) | 1 |
| UE***64 | Bushing | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Control Valve (1/3)
| 80***18 | Washer | 3 |
| 80***09 | Gasket | 1 |
| 80***12 | Gasket, Seal | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Control Valve (2/2)
| 80***12 | Gasket, Seal | 2 |
| 84***92 | Spring | 2 |
| 84***93 | Cover | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Control Valve (3/3)
| 80***12 | Gasket, Seal | 2 |
| 84***63 | Safety Valve, Assembly | 2 |
| 84***84 | Valve Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Dipper Control Cylinder
| 86***07 | Fitting (Except Germany) | 1 |
| 86***04 | Fitting (Only For Germany) | 1 |
| U2***5A | Cap | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Excavation Group
| 80***24 | Screw | 2 |
| 80***92 | Dowel | 1 |
| 80***08 | Nut (With Stabilizers Only) | 12 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Excavation Group Hydraulic System
| 80***08 | Nut (With Stabilizers Only) | 3 |
| UE***63 | Hose | 1 |
| UE***62 | Hose | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Fixed Frame And Sliding Plate
| 50***62 | Washer | 2 |
| 80***65 | Bolt | 4 |
| 80***13 | Bolt | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Hydraulic Piping Hammer (1/2)
| 20***49 | Fitting (For Hammer On Plate And On Excavator) | 1 |
| 20***50 | Body (For Hammer On Plate And On Excavator) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Hydraulic Piping Hammer (2/2)
| 50***10 | Union | 1 |
| 50***47 | Union (For Hand Hammer) | 1 |
| 82***20 | Point | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Lifting Control Cylinder
| 86***07 | Fitting (Except Germany) | 1 |
| 86***04 | Fitting (Only For Germany) | 1 |
| UE***29 | Cap | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Main Valve Control Hydraulic System
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Main Valve Element For Hammer
| 80***93 | Screw | 2 |
| 84***92 | Spring | 1 |
| 84***01 | Kit, Docking, Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Main Valve Support
| 80***46 | Bolt | 8 |
| 80***48 | Bolt | 1 |
| 80***97 | Screw | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Rotation Group
| 20***07 | Housing | 1 |
| 20***11 | Rotation Group, Assembly | 1 |
| 80***94 | Bolt | 12 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Sliding Plate Hydraulic System With Hydraulic Lock
| 50***10 | Union | 1 |
| 50***08 | Elbow (For Hydraulic Lock) | 2 |
| 50***17 | Union | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Excavator E26 (From Serial Number 6335-) : Stabilizers Control Cylinder
Machine And Optional Devices
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Accelerator - Fuel System
| 20***44 | Fuel Tank | 1 |
| 20***57 | Plug, Assembly | 1 |
| 33***71 | Support | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Air Filter - Exhaust Silencer
| 33***68 | Muffler Support | 1 |
| 33***69 | Clamp, Upper | 1 |
| 33***70 | Clamp, Lower | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Arm - Bucket
| 20***82 | Frame | 1 |
| 20***39 | Pushrod | 1 |
| 20***11 | Pin | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Brake Group
| 33***53 | Support | 1 |
| 33***50 | Lever, L.H | 1 |
| 33***51 | Lever, R.H | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Bucket Control Cylinder
| 20***38 | R.H. Cylinder, Assembly | 2 |
| 20***39 | R.H. Cylinder, Assembly | 2 |
| 20***01 | R.H. Cylinder | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Cabin (1/2) : Unit_01_of_02
| 33***27 | Spacer (For Mounting Safety Valves) | 5 |
| 33***55 | Protection | 1 |
| 33***68 | Operator'S Cab, Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Cabin (1/2) : Unit_02_of_02
| 33***27 | Spacer (For Mounting Safety Valves) | 5 |
| 33***79 | Retainer | 1 |
| 33***50 | Operator'S Cab, Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Cabin (2/2)
| 20***98 | Protection | 1 |
| 33***63 | Seat Belt, Assembly | 1 |
| 33***66 | Cover | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Control Valve (1/2)
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Control Valve (2/2)
| 80***93 | Screw | 12 |
| 84***11 | Control Valve, Assembly | 1 |
| 84***84 | Valve Assembly | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Electrical Components
| 33***55 | Ppc Valve, L.H | 1 |
| 33***58 | Knob | 1 |
| 33***51 | Fuel Level | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Engine-Pumps Group
| 20***15 | Rear Bracket | 2 |
| 20***40 | Support | 1 |
| 20***36 | Engine-Pump Support | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Equipment (Germany Version)
| 33***58 | Support | 1 |
| 80***47 | Bolt | 1 |
| 80***00 | Screw (Only For Germany) | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Equipment Unloading Kit
| 20***48 | Coupling, Assembly. (For Hammer On Plate And On Excavator) | 1 |
| 20***49 | Fitting (For Hammer On Plate And On Excavator) | 1 |
| 20***50 | Body (For Hammer On Plate And On Excavator) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Frame
| 20***95 | Window | 2 |
| 20***20 | Plug | 2 |
| 33***68 | Shim | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Lifting Cylinder)
| 20***30 | Fastener | 2 |
| 33***58 | Pipe | 1 |
| 33***59 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Tipping Cylinder)
| 20***30 | Fastener | 1 |
| 33***62 | Pipe | 1 |
| 33***63 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (1/2)
| 20***80 | Hose-Clamp | 1 |
| 33***02 | Valve | 1 |
| 33***76 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (2/2)
| 20***43 | Hydraulic Tank | 1 |
| 20***40 | Indicator Oil Level | 1 |
| 20***90 | Pressure Take-Up | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Hydraulic System Boom Loader Kit
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Instrumentation
| 20***28 | Dashboard | 1 |
| 35***53 | Wrench | 2 |
| 80***60 | Screw | 4 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Lifting Control Cylinder
| 20***37 | Cylinder, Assembly | 2 |
| 20***01 | Cylinder | 1 |
| 39***01 | Piston Rod | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Pedals Locking
| 20***21 | Stopper | 1 |
| 33***02 | Spring | 1 |
| 33***61 | Pushrod | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Pedals Unit
| 20***22 | Central, Pedal | 1 |
| 20***23 | Pedal, L.H | 1 |
| 20***24 | Pedal, R.H | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Radiator - Heat Excangeur Group
| 20***12 | Support, R.H | 1 |
| 20***13 | Support, L.H | 1 |
| 33***77 | Protection | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Rear Door
| 20***10 | Rear Conveyor | 1 |
| 33***52 | Support | 1 |
| 33***53 | Striker | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Road Homologation - Work Light (1/2)
| 33***03 | Support (Version A) | 1 |
| 33***13 | Plate | 2 |
| 33***14 | Washer | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Road Homologation - Work Lights (2/2)
| 33***00 | Support | 1 |
| 33***52 | Protection, Tooth | 1 |
| 33***58 | Support | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Safety Valve (1/2)
| 20***50 | Clamp | 1 |
| 33***02 | U-Bolt | 2 |
| 33***03 | Support | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Safety Valve (2/2)
| 33***55 | Pipe | 1 |
| 33***56 | Pipe | 1 |
| 33***57 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Self-Levelling Valve : Unit_02_of_02
| 84***63 | Valve, Assembly | 1 |
| 84***25 | Valve | 1 |
| 84***26 | O-Ring | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Self-Levelling Valve : Unit_01_of_02
| 84***01 | Valve, Assembly | 1 |
| 84***01 | Plug | 1 |
| 84***02 | Spring | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Shovel Connection Devices
| 33***54 | Support | 2 |
| 33***06 | Lever Extension | 2 |
| 33***51 | R.H. Lock | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Tools - Mark Plate
| 30***38 | Plate ?Fai Komatsu? | 2 |
| 31***12 | Mark Plate Kit (Sk05) | 1 |
| 33***06 | Plate, Max. Speed (Only For Germany) | 3 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Transmission
| 20***13 | Crown Wheel | 4 |
| 20***30 | Chain Stretcher | 4 |
| 33***58 | Chain | 2 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Transmission Hydraulic Motor
| 84***04 | Hydraulic Motor | 2 |
| 84***01 | Gasket | 1 |
| 84***02 | Kit, Gasket | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Transmission Hydraulic Pump (1/2)
| 80***24 | Snap Ring | 1 |
| 80***16 | Snap Ring | 1 |
| 80***30 | Ring, Snap | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Transmission Hydraulic Pump (2/2)
| 80***24 | Snap Ring | 1 |
| 80***30 | Ring, Snap | 1 |
| 80***62 | Ring, Snap | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Transmission Hydraulic System
| 33***52 | Union | 1 |
| 33***53 | Union | 1 |
| 33***80 | Pipe | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Travel Control Lever
| 20***37 | Support, R.H | 1 |
| 20***39 | Support, L.H | 1 |
| 33***64 | Tie-Rod, R.H | 1 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Wheels
| 33***50 | Rim (7jx15") | 4 |
| 33***51 | Rim (5jx12) (Optional) | 4 |
| 50***09 | Stud | 24 |
Komatsu : Sk05-1(S/N 5418-Up) : Machine And Optional Devices : Wire Assembly
| 33***58 | Knob | 1 |
| 33***52 | Wiring Harness | 3 |
| 33***01 | Support | 1 |
SK05-1(S/N 5418-Up) serial number reference
The ID plate sits at the rear of the machine, on the inside of the left or right loader support arm, not on the main frame near the operator's seat. The serial itself is a plain numeric sequence; this model does not carry a letter-based model code in the serial string the way larger Komatsu machines do. Match the full serial against the correct parts-book break for your unit (1001-up vs 5418-up) rather than reading a prefix alone, since the two runs came from different plants and carry different component breakdowns.
| Prefix | Identifies | Notes |
|---|---|---|
| 5418-Up | SK05-1, Italy-built production run (this job's range) | Serial run starting at 5418 is a separate parts-book break from the earlier 1001-up run, issued for the Italy-built continuation of the SK05-1 line. The factory parts breakdown scopes one main hydraulic control valve diagram to serials 5418 through 6328; available sources don't confirm whether that marks an actual component change or just the diagram's coverage window, so treat 6328 as unverified - confirm with dealer before ordering valve components. |
| 1001-Up | SK05-1, Japan-built earlier production run (same model designation, precedes the 5418-up range - not part of this job's serial band) | Listed as its own parts-book break under the same SK05-1 model designation, separate from the 5418-up Italy run. Included here only for context on where the 5418-up band starts; treat as a different serial run, not a variant within 5418-Up. |
Frequently asked questions
What engine does the Komatsu SK05-1 (S/N 5418-Up) use?
Not confirmed in available records for this exact serial range. It is a mechanically-governed, indirect-injection diesel with an inline injection pump and no electronic controller, consistent with the era, before Komatsu's compact line moved to electronic engine management. Sibling Komatsu-Italy wheeled and crawler machines built in the same period are known to have used Perkins or Iveco diesels, the closest documented reference point, but confirm the exact engine tag from the machine's own data plate before ordering engine parts.
What is the operating weight of the Komatsu SK05-1 (S/N 5418-Up)?
Not documented for this exact serial range in available sources. This is one of the lighter, more obscure entries in Komatsu's Italian-built loader-backhoe lineup, and weight varies with cab or canopy, tire choice, and backhoe configuration. Confirm the certified figure from the machine's own data plate, or by weighing it, before quoting transport or attachment load ratings.
What replaced the Komatsu SK05-1?
No single named direct successor is documented. Komatsu retired the FAI-derived nameplate as it folded the former FAI plants at Noventa Vicentina and Este into Komatsu Utility Equipment, later Komatsu Utility Europe and Komatsu Italia Manufacturing, and replaced this generation with later Komatsu-branded compact wheel loader and loader-backhoe ranges engineered fully in-house. Treat those later Komatsu Utility Europe/Komatsu Italia machines as the practical continuation of the lineage rather than a single named model swap.
What SK05-1(S/N 5418-Up) owners discuss
What is the hydraulic system on the SK05-1 (S/N 5418-Up) like, and what do owners typically report?
What wear patterns show up on the front axle and loader arm?
Any known weak points on the rear backhoe/excavator arm?
What engine is in the SK05-1 (S/N 5418-Up), and are there known quirks?
What electrical or sensor issues come up most often?
Is parts availability a concern for a machine this old and rare?
What should a buyer check before purchasing a used SK05-1 (S/N 5418-Up)?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific SK05-1(S/N 5418-Up) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.