Komatsubulldozermedium (d40 - d75)
Komatsu D66S-1(S/N 1001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu D66S-1 (S/N 1001-up) is a crawler loader, sold by Komatsu under the dozer-shovel designation: a dozer-style undercarriage and chassis fitted with a front-mounted loader bucket instead of a dozer blade. Power comes from Komatsu's SA6D110-1 turbocharged inline 6-cylinder diesel, displacing roughly 7.1 liters and rated around 119 kW (160 HP), fed by mechanical governor-type injection with no electronic engine control. Drive is through a hydrostatic transmission (HST) with pedal steering rather than the powershift, clutch-and-brake steering common on Komatsu dozers of the same era. Operating weight runs roughly 17.9 to 18.7 tonnes (about 39,500 to 41,200 lb) depending on bucket configuration and source, with bucket capacity around 1.8 to 2.1 cubic meters (2.4 to 2.8 cu yd) and 508mm triple-grouser track shoes. Komatsu built the D66S-1 across roughly 1991 to 1998, and S/N 1001-up covers the full production run addressed by this shop manual as a single configuration; no distinct blade or ripper variant is tied to this model tag.
What sets the D66S-1 apart within Komatsu's dozer-shovel and crawler loader lineup of the period is its HST drivetrain and pedal steering, a step away from the mechanical drivetrains used on most sibling models of that generation. That added complexity, combined with a comparatively short and low-volume production run, means fewer surviving units and thinner parts and documentation support than more common Komatsu crawler dozers of the same vintage. In today's used and parts market, the model's relevance is almost entirely about keeping the existing fleet running: sourcing HST pump and motor components, final drive parts, undercarriage wear items, and SA6D110-1 engine parts for machines already in service, rather than competing against current production equipment.
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 D66S-1(S/N 1001-UP) specifications
Machine Identity
| Model | Komatsu D66S-1 (S/N 1001-UP) |
| Machine type | Crawler loader / dozer shovel — a track-type loader chassis fitted with a front bucket/shovel rather than a conventional dozer blade. Not a standard S/SU/A/VPAT-blade dozer. |
| Production era | Sources give a production window of roughly late 1980s through the mid-to-late 1990s for this series; exact start/end years vary by source and should be treated as approximate. |
| Transmission type | Hydrostatic transmission (HST) driving the tracks |
Engine
| Engine model | Komatsu SA6D110-1 (110-series diesel, also catalogued as S6D110-1) |
| Configuration | Water-cooled, in-line 6-cylinder diesel |
| Displacement | Approx. 7.1 L (listed consistently for the 110-series 6-cylinder block used on this machine) |
| Gross power | Approx. 119 kW (160 HP); one secondary source rounds to 163 HP — treat as the same published rating with minor source rounding |
| Aspiration/emissions | Mechanically governed diesel, pre-emissions-tier era (no EPA/EU emissions certification applicable — predates Tier regulations) |
| Note on engine identity | One low-quality aggregator result named an S6D102E engine for this model; that does not match the SA6D110-1/S6D110-1 identification confirmed by the parts/shop-manual listings and dealer engine data, and is treated as a mismatch, not used. |
Weights
| Operating weight | Approx. 18.7 t (41,180 lb) per equipment-database listings; a separate listing rounds to approx. 17.9 t. Treat as approx. 17.9–18.7 t depending on configuration/attachment and source rounding. |
Dimensions
| Overall (operating) length | Approx. 6.88 m (22 ft 7 in) with bucket/attachment on the ground |
| Transport length | A separate listing gives approx. 6.62 m for transport configuration — close to but not identical to the operating length figure; variance likely reflects attachment position |
| Overall width | Approx. 2.39 m (7 ft 10 in) over tracks/bucket, per equipment-database listings |
| Overall height | Approx. 3.30 m (10 ft 10 in) to cab/ROPS top |
| Track shoe width | Approx. 508 mm (20 in), triple-grouser shoes |
| Grouser height | Approx. 19 mm (3/4 in) |
| Ground clearance / track gauge | Not documented in available public listings for this serial range — confirm with the factory shop manual or dealer |
Performance
| Travel speeds (F/R, per HST range) | Not documented in available public sources for this serial range. The machine uses a hydrostatic (infinitely variable within range) transmission rather than a stepped powershift gearbox, so speeds are typically published as ranges rather than fixed per-gear figures — verify with dealer or factory spec sheet. |
| Drawbar pull | Not documented in available public sources for this serial range — verify with dealer or factory spec sheet. |
| Gradeability | Not documented in available public sources for this serial range. |
| Ground pressure | One source reported approx. 0.83 kg/cm², but this could not be cross-confirmed against a second independent listing. Treat as unverified — confirm before use. |
Bucket / Loader Attachment
| Attachment type | Front-mounted toothed loader bucket (dozer-shovel configuration), not a blade |
| Bucket capacity | Approx. 1.8–2.1 m³ (2.4–2.8 cu yd) per parts/dealer listings; one listing gives 2.6 cu yd (approx. 2.0 m³) for a toothed bucket — treat as a capacity range that varies by bucket fitted |
| Bucket width | Approx. 2.34 m (92 in) for the toothed bucket variant referenced above |
| Blade options (S/SU/A/VPAT) | Not applicable — this model is catalogued as a crawler loader/dozer-shovel, not a blade dozer. No standard blade-type spec set is published for it. |
Service Capacities
| Fuel tank | Not documented in available public sources — the factory shop manual's fluid/coolant quantity table covers this but exact figures were not accessible; verify with dealer or shop manual. |
| Hydraulic system | Not documented in available public sources for this serial range — verify with dealer or shop manual. |
| Engine oil | Not documented in available public sources for this serial range — verify with dealer or shop manual. |
| Cooling system | Not documented in available public sources for this serial range — verify with dealer or shop manual. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D66S-1(S/N 1001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (w/ filter) | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu genuine EO series diesel engine oil, viscosity grade selected by ambient temperature per the standard Komatsu EO chart (e.g. EO10-30, EO15-40 depending on climate) |
| Cooling system | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu supercoolant / genuine ethylene-glycol antifreeze (AF-NAC type), mixed per climate for freeze protection |
| Fuel tank | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Diesel fuel, ASTM D975 No. 2-D (No. 1-D in cold climates) |
| Powertrain / hydrostatic transmission (HST) | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu genuine TO (powertrain/transmission) oil, grade per ambient-temperature chart. Note: the D66S-1 uses a hydrostatic transmission (HST) with pedal steering, not a powershift transmission with separate bevel-gear/steering-clutch compartments — the OMM does not split this system the way later powershift dozers do |
| Final drives (each side) | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu genuine AXO (axle/final drive) oil, grade per ambient-temperature chart |
| Hydraulic system / tank | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu genuine HO (hydraulic) oil, grade per ambient-temperature chart |
| Pivot shaft | Not listed as a separate serviced compartment in sources found for this model | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range |
| Grease points | Not documented in public sources for this serial range — verify with your dealer or the factory shop manual for this serial range | Komatsu genuine multipurpose lithium-based grease (G2-LI type) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu D66S-1(S/N 1001-UP) 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 |
|
Servicing the D66S-1(S/N 1001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Sample hydrostatic transmission oil and final drive gear oil at each service interval; the D66S-1's HST pump and motor are contamination-sensitive, and early metal or varnish in a sample flags swash-plate or piston wear before a stall. Run SA6D110-1 engine oil analysis to track turbocharger bearing wear and injection pump condition. Monitor coolant for corrosion-inhibitor depletion given the turbocharged block's heat load. Log HST charge pressure and servo response trends to catch drift before loss of pedal steering control.
Corrective & Common Repairs
The hydrostatic transmission is this model's most failure-prone system; charge pump wear, servo linkage drift, and control valve leaks are the common complaints tied to the D66S-1's HST drive. Inspect final drive seals for gear-oil weep from constant tractive loading. Check bucket lift-arm and tilt-cylinder pins for wear driven by loader-cycle duty rather than dozing loads. Verify SA6D110-1 turbocharger boost and injector condition if power loss or smoke appear; mechanical governor injection gives no fault codes to guide diagnosis.
Overhaul & Rebuild Points
Major rebuild attention centers on the HST pump and motor assembly; internal wear here is the leading cause of lost drive power or sluggish steering response on the D66S-1 and warrants full teardown inspection rather than seal-only repair. Check final drive planetary and ring-gear and pinion wear on both sides given the loader's tractive duty cycle. Rebuild the SA6D110-1's turbocharger cartridge and injection pump on a condition basis. Reline or replace triple-grouser track components once wear indicators are reached.
Seasonal & Environment Servicing
Before cold-weather operation, confirm HST oil viscosity is rated for ambient temperature, since the mechanical governor SA6D110-1 has no cold-start electronics to compensate. Warm the HST circuit at low RPM before applying load to protect the pump and motor from cavitation. In hot, dusty conditions, service the air cleaner and radiator and oil cooler fins more often than the standard interval to protect turbocharger and HST cooling. Drain fuel tank condensation more frequently during seasonal humidity swings.
D66S-1(S/N 1001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02135 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
| 07002-03334 | O-Ring, At Transmission Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D66S-1(S/N 1001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Central warning lamp (red) + buzzer | General alarm that a monitored system (commonly the HST circuit) has tripped an out-of-range condition | HST oil overheat, low charge pressure, or a sensor/potentiometer signal fault in the HST control loop | Reduce engine speed to idle, stop machine safely, cycle key off then on; if lamp/buzzer persists check HST oil level and cooler before continuing operation |
| HST oil temperature lamp | Hydrostatic transmission oil temperature has exceeded the safe operating threshold | Clogged HST oil cooler, low HST oil level, or continuous high-load operation in hot ambient conditions | Idle engine to allow cooling, check HST oil level and cooler fins for debris, verify cooler fan operation |
| Engine coolant temperature lamp | Engine coolant temperature above normal range | Low coolant level, blocked radiator, faulty thermostat, or slipping/failed fan belt | Stop and idle engine, check coolant level and radiator for blockage once cooled, inspect fan belt |
| Charge (alternator) lamp | Charging circuit not producing adequate output | Failed alternator, broken/slipping fan belt, or wiring fault in charge circuit | Check fan belt tension and alternator wiring; test alternator output |
| Engine oil pressure lamp | Engine lubrication oil pressure below minimum threshold | Low engine oil level, clogged oil filter, or worn oil pump | Stop engine immediately, check oil level and filter condition before restarting |
| Air cleaner restriction indicator | Intake air filter element is clogged, restricting airflow to the engine | Dust/debris buildup in air filter element | Inspect and clean or replace the air filter element |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D66S-1(S/N 1001-UP) attachments & work tools
Blades (S/SU/A, VPAT)
The D66S-1(S/N 1001-UP) is a compact crawler loader/dozer-shovel, not a dedicated dozer, and it carries a straight-type dozer blade as one of its interchangeable front work tools alongside the loader bucket. Multi-angle S/SU/A blade tiers and VPAT variable-pitch blades are catalog features of Komatsu's larger dedicated dozer lines (D65 and up) — availability for this model is not documented in factory literature for this serial range; verify with a dealer before assuming a VPAT option exists.
Rippers
A rear-mounted ripper is listed among the D66S-1's available work attachments in dealer/parts references, but shank count (single-shank parallelogram vs multi-shank) and ripper weight are not spelled out in the documentation found for this serial range. Treat ripper configuration as unconfirmed and verify against the parts book for the specific unit.
Winches
No factory drawworks/towing winch option is documented for the D66S-1(S/N 1001-UP) in available sources. This Japan-market crawler-loader/dozer-shovel class was not marketed with a rear winch the way Komatsu's larger dedicated dozer models were; a winch fitment for this model is not confirmed.
Drawbars/counterweights
No separate drawbar or counterweight specification is documented for this model in available literature. Any rear attachment point (for a ripper, if fitted) would use the standard rear frame mount rather than a listed drawbar assembly, but dimensions/capacity are not confirmed for this serial range.
Cab/ROPS guarding (forestry/waste)
No forestry or waste-handling guard package (screened cab, belly/underguard, or falling-object structure beyond standard ROPS) is documented for the D66S-1(S/N 1001-UP). It was sold as a general construction crawler loader/dozer-shovel; forestry-spec guarding is not part of its known factory catalog and would need custom/aftermarket fitment.
Hydraulic arrangement (front/rear tools)
The D66S-1 uses a hydrostatic drive per most equipment-database listings (one secondary summary conflicts and says powershift, so treat drivetrain type as needing dealer confirmation). Front hydraulics power the loader bucket/blade linkage; sources do not detail a separate rear hydraulic circuit for ripper actuation, so ripper cylinder plumbing should be verified against the factory shop manual for this serial range.
All D66S-1(S/N 1001-UP) assemblies by section
Every catalogued assembly group for the Komatsu D66S-1(S/N 1001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Damper And Transmission
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Assist Valve? L.H.
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***35 | Bolt,(Without Auto Priming System) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Assist Valve? R.H.
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***35 | Bolt,(Without Auto Priming System) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Brake Valve (1/2)
| 01***60 | Bolt,(For Japan And Sweden) | 8 |
| 01***18 | Bolt, Mount Cover | 2 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Brake Valve (2/2)
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***50 | Capscrew | 2 |
| 01***19 | Washer,(Not Used With Ventilator) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Charge Filter Bypass Valve
| 07***23 | O-Ring,(F2320-62a0 -18 ) | 1 |
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 5 |
| 07***34 | O-Ring, At Transmission Filter | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Charge Safety Valve
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 1 |
| 70***10 | O-Ring (Kit) | 1 |
| 72***00 | Valve Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Damper
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***80 | Bolt | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Equalize Valve
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 07***18 | O-Ring,(See Fig.1601-29?1602-17) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : High Pressure Relief Valve? L.H.
| 72***00 | Assist Valve Ass'Y | 1 |
| 72***00 | Valve Ass'Y,High Pressure | 2 |
| (7***0) | Hst Ass'Y,L.H | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : High Pressure Relief Valve? R.H.
| 72***00 | Valve Ass'Y,High Pressure | 2 |
| 72***01 | Assist Valve Ass'Y | 1 |
| (7***1) | Hst Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Motor? L.H. (1/2)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 4 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Motor? L.H. (2/2)
| 04***28 | Bolt, Eye - Lifting | 1 |
| 07***23 | O-Ring,(F4320-61a0 -29 ) | 2 |
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Motor? R.H. (1/2)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 4 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Motor? R.H. (2/2)
| 04***28 | Bolt, Eye - Lifting | 1 |
| 07***23 | O-Ring,(F4320-61a0 -29 ) | 2 |
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Bypass Valve To Hst Unit)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***95 | Bolt | 2 |
| 01***60 | Bolt | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Filter To Byass Valve To Tank)
| 01***70 | Bolt (Op) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***65 | Bolt,(Except Japan) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (1/2)(#1001-1781)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***65 | Bolt,(Except Japan) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (1/3)(#1782-)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***65 | Bolt,(Except Japan) | 2 |
| 01***20 | Bolt | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (2/2)(#1001-1399)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (2/2)(#1400-1781)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***65 | Bolt,(Except Japan) | 2 |
| 01***85 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (2/3)(#1782-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***65 | Bolt,(Except Japan) | 2 |
| 01***85 | Bolt,(For 2nd Travel Speed) (Op) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Oil Cooler Line) (3/3)(#1782-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***65 | Bolt,(Except Japan) | 2 |
| 01***85 | Bolt, Mount Tubes To Switch And Work Pumps | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Pump To Brake Valve To Hst Unit)
| 01***35 | Bolt,(For Position Fixing) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Tank To Brake Valve To Hst Unit)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Oil Piping (Tank To Pump To Filter)
| 01***70 | Bolt (Op) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? L.H. (1/2)(#1001-1399)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? L.H. (1/2)(#1400-)
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? L.H. (2/2)(#1001-1399)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 1 |
| 72***30 | Plug | 1 |
| (****1) | Retainer Kit | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? L.H. (2/2)(#1400-)
| 01***35 | Screw | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
| 07***75 | O-Ring,Steering Oil Filter | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? R.H. (1/2)(#1001-1399)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? R.H. (1/2)(#1400-)
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? R.H. (2/2)(#1001-1399)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 1 |
| 72***30 | Plug | 1 |
| (7***1) | Hst Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Pump? R.H. (2/2)(#1400-)
| 01***35 | Screw | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
| 07***75 | O-Ring,Steering Oil Filter | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Servo Filter(#1001-1015)
| 01***60 | Bolt, Mount Tube To Switch Pump | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Servo Filter(#1016-)
| 01***65 | Bolt,(Except Japan) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Tank
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Unit? L.H.
| 01***45 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***25 | Bolt,Without Revolution Sensor | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hst Unit? R.H.
| 01***45 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 5 |
| 01***55 | Bolt,(Not Used For Chip Dozer) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Hydraulic Pump (Hst)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
| 04***12 | Ring, Snap | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Neutral Bypass Valve? L.H.
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 07***20 | O-Ring,Relief Valve | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Neutral Bypass Valve? R.H.
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 07***20 | O-Ring,Relief Valve | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Relief Valve Block And Charge Relief Valve
| 07***23 | O-Ring,(Crusher?Other Att.For Ppc Con | 2 |
| 07***09 | Plug,(For 2-Actuater Attachment) | 1 |
| 72***00 | Assist Valve Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Servo Valve? L.H. (For Motor)
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***12 | Bolt | 4 |
| 01***23 | Washer,(For Shipping) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Servo Valve? L.H. (For Pump)
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***23 | Washer,(For Shipping) | 4 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 5 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Servo Valve? R.H. (For Motor)
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***12 | Bolt | 4 |
| 01***23 | Washer,(For Shipping) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Servo Valve? R.H. (For Pump)
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***23 | Washer,(For Shipping) | 4 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 5 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Torque Splitter (1/2)
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 8 |
| 01***40 | Bolt,(With Service Valve R.H.) | 24 |
| 01***14 | Nut,Ring | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Torque Splitter (2/2)
| 01***60 | Bolt,(For Japan And Sweden) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
| 01***40 | Bolt,(With Service Valve R.H.) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Transmission Control Lever
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Transmission Control Lever (For Tbg)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Transmission Safety Lock Lever
| 01***08 | Washer,(For 1 Attachment And Pat) | 2 |
| 04***20 | Pin, Spring Retainer | 1 |
| 04***12 | Pin,Cotter (For Ripper) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Universal Joint (Damper To Torque Splitter)
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 1 |
| 07***45 | Bolt,(Tree Pusher Dozer) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Damper And Transmission : Universal Joint (Torque Splitter To Hst Unit)
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 24 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 1 |
| 13***10 | Bolt | 24 |
Engine Related Parts And Electrical System
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Battery
| 01***30 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***18 | Bolt | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Control Box
| 78***02 | Control Box Ass'Y | 1 |
| 78***02 | Control Box Ass'Y | 1 |
| 78***03 | Control Box Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (1/5)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (2/5)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (3/5)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 10 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (4/5)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (5/5)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (For Hst System)
| 01***16 | Bolt (With Air Heater & Conditioner) | 9 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 11 |
| 08***14 | Clip,(For Slag Handling) (For Usa) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 16 |
| 01***40 | Bolt,(With Service Valve R.H.) | 16 |
| 01***55 | Bolt,(For Reinforced Type) | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts (Noise Suppression For Ec)
| 01***40 | Bolt,(With Service Valve R.H.) | 16 |
| 01***55 | Bolt,(For Reinforced Type) | 16 |
| 01***45 | Bolt | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Control Lever
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***25 | Screw | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Control Linkage
| 01***25 | Bolt,Without Revolution Sensor | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Main Tank And Piping
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Sub Tank And Piping
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel (1/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Screw | 10 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 10 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel (2/2)
| 01***10 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 1 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Insturment Panel (For Tbg)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Screw | 10 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 10 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Panel Ass'Y (Except Japan)
| 01***16 | Screw,(For 7861-52-4101) | 20 |
| 01***05 | Washer,(Without Window Washer) | 20 |
| 78***10 | Bulb - 1.4 Watt | 5 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator And Oil Cooler
| 01***10 | Bolt (Op) | 7 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 17 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator And Oil Cooler (Noise Suppression For Ec)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 7 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 17 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator Cover
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 19 |
| 01***65 | Bolt, Mount Radiator To Frame (Bottom) | 2 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator Cover (Noise Suppression For Ec)
Komatsu : D66s-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator Piping
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Guard
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner (Compressor Mounting) (Std? For Japan) (Op? Except Japan)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***90 | Bolt,With Cover | 4 |
| 01***30 | Bolt,(With Body Positioner) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner (Cooler Piping)(Std? For Japan)(Op? Except Japan)(#1001-2011)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner (Cooler Piping)(Std? For Japan)(Op? Except Japan)(#2012-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner (Heater Piping)(Std? For Japan)(Op? Exceot Japan)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
| 07***89 | Clamp,(For Japan) | 12 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner Unit (Std? For Japan) (Op? Except Japan) (1/2)(#2012-)
| 14***10 | Insulator | 1 |
| 19***20 | Evaporator Ass'Y | 1 |
| 19***30 | Tube | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner Unit (Std? For Japan) (Op? Except Japan) (2/2)(#2012-)
| 14***70 | Relay Ass'Y | 1 |
| 14***70 | Insert | 3 |
| 14***80 | Bushing | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Conditioner Unit (Std? For Japan) (Op? Except Japan)(#1001-2011)
| 14***01 | Air Conditioner | 1 |
| 14***70 | Relay Ass'Y | 1 |
| 14***60 | Clip | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Air Duct (Std? For Japan) (Op? Except Japan)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***16 | Bolt - Seat And Tether Belt Mounting | 5 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Compressor (Std? For Japan) (Op? Except Japan)(#2011-)
| 04***20 | Ring, Snap | 1 |
| 14***90 | Bearing | 2 |
| 14***10 | Clutch Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Compressor (Std? For Japan) (Op? Except Japan)(#2012-)
| 20***11 | Air Compressor Ass'Y | 1 |
| ND***70 | Clamp, Tapping | 1 |
| ND***00 | Washer? 0.3mm,Plate? Sk | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Condenser (Std? For Japan) (Op? Except Japan)(#1001-2011)
| 01***65 | Bolt,R.H | 4 |
| 01***04 | Nut,(For Air Conditioner Less) | 3 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Condenser (Std? For Japan) (Op? Except Japan)(#2012-)
| 14***20 | Cover Sub Ass'Y | 1 |
| 14***30 | Cover Sub Ass'Y | 1 |
| 14***40 | Cover Sub Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (1/2) (Noise Suppression For Ec)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***12 | Screw,(Additional Sun Visor) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (1/4)(#1001-1399)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 8 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (1/4)(#1400-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***12 | Screw,(Additional Sun Visor) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (2/2) (Noise Suppression For Ec)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 10 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (2/4)
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (3/4)(#1001-1399)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 10 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (3/4)(#1400-)
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 14 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 14 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 14 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (4/4)(#1001-1399)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood (4/4)(#1400-)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 10 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 12 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood Handle And Step (For Tbg)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 14 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Engine Hood Handle And Step (For Tbg) (Noise Suppression For Ec)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 10 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Equalizer Bar
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 24 |
| 01***40 | Bolt,(With Center Guard) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 24 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Fender And Side Cover (Noise Suppression For Ec)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 20 |
| 01***50 | Bolt,(For Strengthened Cover) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Fender And Side Cover(#1001-1399)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Fender And Side Cover(#1400-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 20 |
| 01***50 | Bolt,(For Strengthened Cover) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Floor Frame
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 16 |
| 01***50 | Bolt,(For Tree Pusher) | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Floor Frame (For Tbg)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 16 |
| 01***50 | Bolt,(For Tree Pusher) | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Floor Frame (For Tbg) (Noise Suppression For Ec)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 16 |
| 01***50 | Bolt,(For Tree Pusher) | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Front Cover And Side Cover
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 25 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Front Cover And Side Cover (Noise Suppression For Ec)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 25 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (English)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (English) (For Tbg)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (English) (Noise Suppression For Ec)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (French)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (Ex. France) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (German)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (German) (For Tbg)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (German) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (Italian) (Noise Suppression For Ec)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (Portuguese)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Marks And Plates (Spanish)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operat0r'S Seat (Noise Suppression For Ec)(#1001-1945)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operat0r'S Seat (Noise Suppression For Ec)(#1946-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operat0r'S Seat(#1305-1945)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Box
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 14 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 28 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Box (For T.B.G.) (Noise Suppression For Ec)
| 01***20 | Bolt | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 14 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Box (For Tbg)
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Box (Noise Suppression For Ec)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 14 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 28 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Seat (For Tbg)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Seat (Reclining Device)(#1001-1945)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Seat (Reclining Device)(#1946-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Seat(#1001-1304)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Operator'S Seat(#1946-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rear Hook(#1001-1399)
| 01***60 | Bolt, Mount Pole | 4 |
| 01***60 | Flat Washer - M20 (Hardened) | 4 |
| 14***20 | Hook,(With Hook) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (1/4) (Op? For Japan) (Std? Except Japan)
| 01***20 | Bolt,(Without Maintenance Monitor) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (2/4) (Op? For Japan) (Std? Except Japan)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 3 |
| 01***08 | Screw | 3 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (3/4) (Op? For Japan) (Std? Except Japan)
| 01***20 | Bolt,(Without Maintenance Monitor) | 6 |
| 01***45 | Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 18 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (4/4) (Op? For Japan) (Std? Except Japan)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***20 | Screw, Filter Mounting | 7 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (1/4) (Noise Suppression For Ec)
| 01***20 | Bolt,(Without Maintenance Monitor) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (2/4) (Noise Suppression For Ec)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 3 |
| 01***06 | Screw | 4 |
| 01***06 | Screw | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (3/4) (Noise Suppression For Ec)
| 01***20 | Bolt,(Without Maintenance Monitor) | 20 |
| 01***45 | Bolt | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 18 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (4/4) (Noise Suppression For Ec)
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (Electrical System) (Noise Suppression For Ec)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (Electrical System) (Op? For Japan) (Std? Except Japan)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab (For Tbg)
| 01***20 | Bolt,(Without Maintenance Monitor) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab Door (For Tbg)
| 01***20 | Bolt,(Without Maintenance Monitor) | 14 |
| 01***45 | Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 18 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Rops Cab Window (For Tbg)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 3 |
| 01***08 | Screw | 3 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Steel Cab (1/4) (Std? For Japan) (Op? Except Japan)(#1001-1187)
| 01***20 | Bolt,(Without Maintenance Monitor) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Steel Cab (2/4) (Std? For Japan) (Op? Except Japan)(#1001-1187)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 3 |
| 01***08 | Screw | 3 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Steel Cab (3/4) (Std? For Japan) (Op? Except Japan)(#1001-1187)
Komatsu : D66s-1(S/N 1001-Up) : Guard : Steel Cab (4/4) (Std? For Japan) (Op? Except Japan)(#1001-1187)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***20 | Screw, Filter Mounting | 7 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Steel Cab (Electrical System) (Std? For Japan) (Op? Except Japan)(#1001-1187)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Suspension(#1946-)
| 01***10 | Nut,(Without Air Conditioner) | 4 |
| 01***16 | Washer,(With Water Separator) | 2 |
| 01***26 | Washer,Plain | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Under Guard
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Guard : Under Guard (Noise Suppression For Ec)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 6 |
Optional Parts
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Air Duct (For Car Heater)
| 01***16 | Bolt (With Air Heater & Conditioner) | 9 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Back-Up Alarm
| 01***10 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 3 |
| 01***05 | Bolt, Mount Hose Clip | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Canvas Canopy
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 16 |
| 01***45 | Bolt | 8 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 16 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Cover? For Non Roof Machine (For Non Air Conditioner Head Guard And Canopy)
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***16 | Screw | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Head Guard
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
| 01***50 | Bolt,(For Tree Pusher) | 8 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Heater Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
| 07***89 | Clamp,(For Japan) | 12 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Heater Unit
| 14***10 | Valve Ass'Y,Water | 1 |
| 14***10 | Heater Ass'Y | 1 |
| 14***70 | Insert | 3 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Rear Protector(#1001-1399)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 20 |
| 04***12 | Lock,Plate | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Rear Protector(#1400-)
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 8 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 8 |
| 14***00 | Frame | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Reinforced Bucket (Except Japan)
| 01***25 | Bolt,(For High High Lift) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Reinforced Under Guard
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***55 | Bolt,(For Reinforced Type) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Rops Canopy (For Usa)
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
| 01***50 | Bolt,(For Tree Pusher) | 8 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Two Piece Teeth
| 09***90 | Bolt,(Except Japan) | 25 |
| 09***19 | Nut,(Except Japan) | 27 |
| 09***16 | Pin,(Except Japan) | 9 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Vandalism Protection
| 09***03 | Lock | 1 |
| 09***08 | Lock,(Includes 8 P.C.S.) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Optional Parts : Vandalism Protection (For Without Cab) (Std? For U.S.A.)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
| 09***04 | Lock,(Includes 4 P.C.S.) | 1 |
Steering System And Final Drive
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Brake
| 01***20 | Bolt | 6 |
| 01***45 | Bolt | 14 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Brake Lock Lever (Op)
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 1 |
| 04***15 | Pin,Cotter (Itl) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Brake Pedal
| 01***16 | Bolt (With Air Heater & Conditioner) | 7 |
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***65 | Bolt,(Except Japan) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Brake Pedal Linkage
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 1 |
| 01***06 | Nut,L.H. Thread (For Russian) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Final Drive Housing
| 01***30 | Bolt,(Not Used With Emergency Str.) | 28 |
| 01***40 | Bolt,(With Center Guard) | 90 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 62 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Hand Pump Linkage(#1001-1399)
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***30 | Bolt,(For Mechanical Governor) | 5 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Hand Pump Linkage(#1400-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 1 |
| 04***10 | Pin,Cotter (Without Towing Winch), Cotter Pin; Was 04050-11610 | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Main Frame
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Main Frame (Noise Suppression For Ec)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Sprocket
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 24 |
| 01***60 | Bolt | 36 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 24 |
Komatsu : D66s-1(S/N 1001-Up) : Steering System And Final Drive : Steering Pedal
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Tool And Kit
Komatsu : D66s-1(S/N 1001-Up) : Tool And Kit : Spare Parts (Except Japan) (Except U.S.A.)
| 04***62 | V-Belt Set | 1 |
| 07***80 | O-Ring,Hydraulic Oil Filter | 1 |
| 07***35 | O-Ring,Hydraulic Oil Filter | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Tool And Kit : Tool (Except Japan)
| 07***50 | Pump, (Bellows Type) | 1 |
| 07***03 | Cartridge - Grease | 1 |
| 07***00 | Nozzle, Grease Pump (Flexible Type) | 1 |
Track
Komatsu : D66s-1(S/N 1001-Up) : Track : Carrier Roller(#1001-1918)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 8 |
| 01***85 | Bolt | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Carrier Roller(#1919-)
| 01***30 | Bolt,(For Rubber Shoe) | 4 |
| 01***85 | Bolt,(Tree Pusher Dozer) | 8 |
| 01***60 | Flat Washer - M20 (Hardened) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Idler
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
| 01***60 | Bolt,(For Ripper) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Pivot Shaft
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***65 | Bolt (D65p) | 16 |
| 01***60 | Bolt, Mount Pole | 24 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Recoil Spring
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Frame (Except Japan)
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 16 |
| 01***40 | Bolt (Op) | 16 |
| 01***45 | Bolt (Op) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Frame Cover
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 20 |
| 01***70 | Bolt,(For Rops) | 12 |
| 01***10 | Bolt (Itl) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Roller(#1001-1918)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***65 | Bolt (D65p) | 48 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Roller(#1919-)
| 01***65 | Bolt,(For Shipping) | 48 |
| 01***45 | Washer,(Without R.O.P.S.) | 48 |
| 07***17 | Plug | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Shoe (Except Japan)(#1001-1942)
| 07***30 | Plug,(Large) | 78 |
| 07***21 | Plug,(Small) | 78 |
| 14***62 | Track Link Ass'Y | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Track : Track Shoe(#1943-)
| 07***30 | Plug,(Large) | 78 |
| 07***21 | Plug,(Small) | 78 |
| 14***63 | Track Link Ass'Y | 1 |
Work Equipment
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Bucket (Except Japan)
| 01***25 | Bolt,(For High High Lift) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Bucket (For Japan)
| 01***25 | Bolt,(For High High Lift) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Bucket (For U.S.A.)
| 01***25 | Bolt,(For High High Lift) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 6 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Bucket And Lift Arm Lock Parts (Std? For Usa) (Op? Except Usa)
| 01***30 | Bolt | 4 |
| 01***13 | Nut,(For Adjustable Rod) | 8 |
| 01***26 | Washer,Spring | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Bucket Dropping Protect Parts (Std? For Usa) (Op? Except Usa)
| 11***05 | Pin Ass'Y (Welded) | 2 |
| 14***10 | Stopper | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Lift Arm
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For High High Lift) | 10 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Ripper Frame
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 12 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment : Spill Guard (For Japan) (Op)
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 8 |
| 01***75 | Bolt | 4 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 12 |
Work Equipment Control System
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Lever
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Linkage (1/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Linkage (2/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Lock Lever
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Screw | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Lock Lever (For Tbg)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***16 | Screw | 4 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Dump Cylinder(#1001-1781)
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Dump Cylinder(#1782-)
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Lift Cylinder
| 01***80 | Bolt | 4 |
| 01***83 | Washer, Spring | 4 |
| 07***45 | O-Ring,Cover | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Bucket Positioner
| 01***35 | Bolt | 3 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydralic Control Valve (1/3)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 07***14 | O-Ring,(F4350-63a1a-2 ) | 2 |
| 07***34 | O-Ring, O-Ring,Drain Plug? R.H. Half Tank | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydralic Control Valve (2/3)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt, Mount Spool Covers | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydralic Control Valve (3/3)
| 07***34 | O-Ring,Transmission And Steering Case | 3 |
| 70***00 | Valve Ass'Y,Arm High | 1 |
| 70***01 | Valve Ass'Y,Suction And Safety (B) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Control Valve (1/3) (For Ripper)
| 07***14 | O-Ring,(F4350-63a1a-2 ) | 2 |
| 07***30 | Ring, Seal - Between Sections | 1 |
| 07***32 | O-Ring,(See Fig. H0312-01a0-4) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Control Valve (2/3) (For Ripper)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt, Mount Spool Covers | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Control Valve (3/3) (For Ripper)
| 07***34 | O-Ring,Transmission And Steering Case | 1 |
| 70***00 | Valve Ass'Y,Suction And Safety (B) | 2 |
| 70***00 | Safety Valve Ass'Y,Suction And Safety (A) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Oil Cooler Line)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***65 | Bolt,(Except Japan) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Oil Drain Line)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***08 | Nut (Op) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Ripper Valve)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***80 | Bolt, Mount Tubes To Switch And Work Pumps | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 9 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Tank To Pump To Valve)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***50 | Bolt,(With Service Valve R.H.) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Tank To Pump To Valve) (For Ripper)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Ripper Cylinder)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***65 | Bolt,(Except Japan) | 8 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Dump Cylinder)
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 3 |
| 01***25 | Bolt, Mount Filter To Bracket | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Left Cylinder)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 24 |
| 01***50 | Bolt,(For Strengthened Cover) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Tank)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***50 | Bolt,(With Service Valve R.H.) | 2 |
| 01***65 | Bolt,(Except Japan) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Valve)
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 3 |
| 01***25 | Bolt, Mount Filter To Bracket | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valve To Valve) (For Ripper)
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 3 |
| 01***25 | Bolt, Mount Filter To Bracket | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Pump (Work Equipment)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 4 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Tank And Filter
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 4 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Lift Arm Kick Out
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Ripper Control Lever
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Ripper Cylinder
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***11 | Nut,(With Under Mirror) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 1 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Unload Valve (1/2)
| 01***50 | Bolt | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
Komatsu : D66s-1(S/N 1001-Up) : Work Equipment Control System : Unload Valve (2/2)
| 07***34 | O-Ring, At Transmission Filter | 1 |
| 70***61 | O-Ring,(Pc100ss) | 1 |
| 70***90 | Ring,Back-Up (Itl) | 1 |
D66S-1(S/N 1001-UP) serial number reference
On the D66S-1 the PIN/serial plate sits on the main frame, typically on the right side near the operator's platform or front frame rail, viewed in the direction of travel; some units also carry the number stamped into the frame itself. Read it as the model code (D66S-1) followed directly by the sequential unit number (e.g. 1001, 1858, 9793) -- this machine does not use a 3-character alphanumeric prefix ahead of the number the way later PC/D-series machines do.
| Prefix | Identifies | Notes |
|---|---|---|
| 1001-UP | JPN-market crawler loader / dozer shovel, single configuration | Factory shop and parts manuals cover this model as one continuous production run starting at serial 1001, with no 3-character alphanumeric PIN prefix branches (unlike later Komatsu PC/D-series machines that split by plant or generation letter code). No Std/XL/LGP or steering-system sub-variant split exists; the machine uses a single hydrostatic-drive (HST) configuration throughout the run. Engine is the Komatsu SA6D110-1, a 6-cylinder water-cooled diesel with its own separate serial numbering starting at 50001-up. A later-printed parts catalog edition begins coverage at unit 1400, but this reflects a document reprint/revision point, not a chassis serial or configuration split -- confirm with dealer if it affects a specific part lookup. |
Frequently asked questions
What engine powers the Komatsu D66S-1 (S/N 1001-up)?
It uses Komatsu's SA6D110-1 turbocharged 6-cylinder diesel, displacing about 7.1 liters and rated around 119 kW (160 HP), with mechanical governor-type fuel injection and no electronic engine control.
What is the operating weight of the Komatsu D66S-1?
Operating weight runs roughly 17.9 to 18.7 tonnes (about 39,500 to 41,200 lb) depending on bucket configuration and source; treat this as a range rather than a single fixed figure.
What replaced the Komatsu D66S-1?
No confirmed direct successor has been verified for the D66S-1 (S/N 1001-up). Komatsu's later dozer-shovel and crawler loader lineup included dash-series models such as the D65S and D75S, but no documented lineage explicitly ties the D66S-1 to a specific successor, so this should be treated as unconfirmed.
What D66S-1(S/N 1001-UP) owners discuss
What do owners and mechanics generally say about the D66S-1(S/N 1001-UP)'s reputation?
Community consensus is mixed. The D66S-1 was built in low volume to compete with rival hydrostatic crawler loaders of its era, and several long-time owners note it never earned the reliability reputation of the established competition, so total surviving population stayed thin. A recurring complaint is parts sourcing: many components are no longer stocked, and what turns up is expensive given the machine's age and low production run. Owners who kept a well-sorted example still call it a strong loader when everything is working.
What hydrostatic transmission (HST) quirks come up repeatedly in forum discussion?
Multiple threads describe early-production HST units failing prematurely, and the informal community rule of thumb is to favor later-serial machines, reportedly serial numbers above roughly 1400, on the assumption that running changes improved durability over the production span. When a unit won't travel but the engine runs fine, posters point to loss of charge pressure as the first suspect: pull and inspect the charge/servo filter and screen for fine metal or debris, which points to pump or drive-motor wear. A standard diagnostic step mentioned is capping the propel hoses to isolate the charge pump from the travel motors and see whether pressure recovers, which narrows the fault to one side of the circuit. Because this is a closed hydrostatic loop, have your dealer verify charge pressure with gauges before any teardown.
The machine pulls or circles to one side, especially in reverse. What's the typical cause?
Owners describe a loader that tracks straight forward but curls to one side in reverse, and trying to correct it with the opposite steering pedal causes a sharp loss of power rather than a clean correction. The diagnosis raised in owner/mechanic exchanges is excessive case drain from one travel motor relative to the other, found by comparing case drain flow or pressure side to side rather than assuming a linkage or valve problem. Because this points to internal wear in the closed-loop drive motors, have your dealer verify case drain readings before committing to a motor rebuild or replacement.
What electrical or sensor problems show up most often?
A recurring complaint is an intermittent fault where the machine runs and travels normally, then suddenly stops moving while a warning light flashes and a buzzer sounds; owners report that idling the engine down and cycling the key off and on clears the fault temporarily, which points to a marginal signal rather than a hard failure. Suspected sources named by owners include the control potentiometers used in the propel/steering circuit, of which this machine has several, and general corrosion or looseness in the main wiring harness and connectors after decades of service. Basic troubleshooting favored in these threads starts simple: load-test the batteries for a dead cell, then clean all battery, starter, and chassis ground connections before chasing the potentiometers themselves.
What undercarriage and wear patterns should owners expect?
The D66S-1 rides on a triple-grouser pad undercarriage typical of crawler loaders of its class and era. Sellers and owners commonly describe remaining undercarriage life as a percentage when listing used units, and pad chipping is treated as a normal age-related wear pattern rather than a defect. Bucket pin condition is also watched closely; tight pins with little play are read by buyers as a sign the machine was greased and maintained on schedule.
Is there much community discussion specific to the SA6D110-1 engine in this loader?
Very little. Owner and mechanic discussion of the D66S-1 concentrates almost entirely on the hydrostatic driveline and the control electronics, not the diesel engine itself. No complaint threads or repeat failure patterns tied specifically to the engine as installed in this loader turned up in available discussion. That gap is consistent with the model's low production and age rather than a sign the engine was trouble-free; treat engine-specific claims for this pairing as thinly documented until confirmed by a shop familiar with the machine.
What should a buyer check before purchasing a used D66S-1(S/N 1001-UP)?
Have an experienced mechanic inspect the machine and pull hydraulic oil samples rather than relying on a walk-around. Pull the transmission servo filter and screen and check for fine metal or debris as an early warning of pump or drive-motor wear. Test the control potentiometers and inspect the main wiring harness and connectors for corrosion, since intermittent travel cutouts are a known pattern on this model. Check undercarriage pad wear percentage and bucket pin tightness as maintenance indicators. Confirm the serial number, since later-production units are generally preferred by the community over the earliest examples. Factor in that replacement parts are scarce and costly given the age and low production volume. Because full evaluation of the hydrostatic charge circuit and travel motors requires pressure testing, have your dealer verify the HST system's condition before finalizing a purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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