Komatsu DDM053_1A(S/N (80001)-UP (D53A-17))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DDM053_1A is the internal arrangement code for the D53A-17 crawler dozer, S/N 80001-and-up, a mid-size mechanical dozer from Komatsu's D50/D53-series built in the late 1980s into the mid-1990s. It runs a 6D125-1 naturally aspirated 6-cylinder diesel rated at roughly 128 hp (95 kW) gross at 1900 rpm, fed by a mechanical inline injection pump with a mechanical governor and no electronic engine controls. Drive is through a TORQFLO torque-converter powershift transmission with mechanical clutch-and-brake-band steering. Operating weight runs roughly 12.5-13.6 t (28,200-30,000 lb) depending on configuration. The -17 series was offered as the standard-track D53A-17 and the wider-track D53P-17 for softer ground, with a D53S-17 swamp variant referenced for low ground-pressure work; all share factory documentation with the related D50A-17 and D50P-17 models.
The D53A-17 followed the earlier D53A-16 in Komatsu's mechanical dozer lineup, with the -17 series carrying the 6D125-1 engine and TORQFLO transmission shared across the D50/D53 family rather than a single-model redesign. Differences across the family sit mainly in track gauge and shoe width, aimed at matching ground pressure to the job rather than changing the core powertrain. No confirmed direct successor to this exact D53A-17 serial range is documented; treat it as part of the broader D50/D53-series lineage rather than assume a specific follow-on model. In today's used and parts market, the D53A-17 remains relevant because its fully mechanical fuel system, transmission, and steering are straightforward to diagnose and rebuild without scan tools, and parts commonality across the D50A-17/D50P-17/D53A-17/D53P-17 family widens the pool of usable components for owners running these machines on grading, land-clearing, or utility work.
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 DDM053_1A(S/N (80001)-UP (D53A-17)) specifications
Machine Identification
| Model family | Komatsu D53A-17 crawler dozer (DDM053_1A internal arrangement code); part of the D50A-17/D50P-17/D53A-17/D53P-17 shop-manual family covering S/N 80001-up |
| Related sibling in same serial/manual range | D53P-17 (swamp, wide-track version) and D50A-17/D50P-17 (lower power tier) share the same shop manual and serial start point; specs below are for the D53A-17 standard-gauge version unless noted |
Engine
| Engine model | Komatsu 6D125-1, naturally aspirated 6-cylinder diesel. Some parts listings for this exact serial range reference the SA6D125E/6D125E-2 variant instead — confirm the exact engine tag against the machine's serial plate before ordering engine parts. |
| Rated power | Approx. 128 hp (95 kW) gross at 1900 rpm |
| Displacement | Approx. 11.0-11.1 L (673.8 cu in) |
| Aspiration | Naturally aspirated |
| Cylinders | 6 |
Weights
| Operating weight | 12,800-13,600 kg (28,219-29,970 lb), varies by configuration |
Dimensions (standard configuration)
| Overall length with blade | approx. 4.79 m (15.7 ft) |
| Overall width over tracks | approx. 2.35 m (7.7 ft) |
| Overall height to top of cab | approx. 2.90-2.93 m (9.5-9.6 ft) |
| Ground clearance | approx. 0.34 m (1.1 ft) |
| Length of track on ground | approx. 2.38 m (7.8 ft) |
Undercarriage
| Track gauge | approx. 1.89 m (6.2 ft) |
| Standard shoe width | approx. 462 mm (18.2 in) |
| Track pitch | approx. 175 mm (6.9 in) |
| Track rollers per side | 5 |
| Carrier rollers per side | 2 |
| Shoe count per side | 41 shoes per side — not independently cross-verified for this exact model; confirm with your dealer |
Blade
| Standard blade width | approx. 3.75 m (12.3 ft) |
| Standard blade height | approx. 876 mm (34.5 in) |
| Blade capacity and alternate blade types | Not documented for this exact model — confirm with your dealer |
Transmission & Performance
| Transmission type | Torque-converter power-shift (TORQFLO), 3 forward / 3 reverse gears |
| Travel speed (forward/reverse, all gears) | Not published specifically for the D53A-17. The wider-track D53P-17 sibling lists approx. 8.6 km/h (5.4 mph) max forward and 10.2 km/h (6.4 mph) max reverse as an indicative reference — verify with your dealer for the standard-gauge A-17 |
| Drawbar pull | Not documented for this exact serial range — confirm with your dealer |
| Gradeability | Not documented for this exact serial range — confirm with your dealer |
| Ground pressure | Not documented for this exact serial range — confirm with your dealer or factory spec sheet |
Service Capacities
| Fuel tank capacity | Not confirmed for the D53A-17 specifically. The D53P-17 sibling lists approx. 250 L (66.1 gal) as an indicative reference only |
| Engine oil capacity | Not documented for this exact serial range — confirm with your dealer or shop manual |
| Cooling system capacity | Not documented for this exact serial range — confirm with your dealer or shop manual |
| Hydraulic system capacity | Not documented for this exact serial range — confirm with your dealer or shop manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
DDM053_1A(S/N (80001)-UP (D53A-17)) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter) — 6D125-1 naturally aspirated diesel | Exact refill quantity not confirmed for this serial range. Verify against the machine's fluid decal or with a Komatsu dealer before servicing. | Komatsu engine oil (EO), graded by ambient temperature per the OMM's climate chart — typically EO10W in cold starts, EO10W30 in moderate ranges, EO30 or EO15W40 in warm climates. Change engine oil and filter together per the periodic maintenance schedule. |
| Cooling system | Exact refill quantity not confirmed for this serial range. Verify with your dealer or shop manual before servicing. | Komatsu Super Coolant concentrate mixed 50/50 with clean water, or an equivalent Komatsu-approved corrosion-inhibited coolant. Mix ratio adjusted for climate per the OMM's freeze-point chart. |
| Fuel tank | Exact tank capacity not confirmed for this serial range. Verify with your dealer or shop manual before servicing. | ASTM D975 No. 2-D diesel fuel for normal ambient temperatures; No. 1-D diesel recommended in cold climates to prevent fuel waxing/gelling. |
| Powershift transmission case | Exact refill quantity not confirmed for this serial range. Verify with your dealer or shop manual before servicing. | Komatsu powertrain oil, factory-specified as TO-30 for normal/warm ambient operation, with a lighter grade such as TO-10 called out for cold-weather startup per the OMM's viscosity chart. |
| Bevel gear / steering clutch-brake compartment | Exact refill quantity not confirmed for this serial range. The OMM lists this as a separate refill point from the transmission case. Verify with your dealer or shop manual before servicing. | Same Komatsu powertrain (TO) oil family used in the transmission case — TO-30 for normal/warm ambient, lighter TO-grade oil for cold starts. |
| Final drive case, each side | Exact per-side refill quantity not confirmed for this serial range. Left and right final drives are serviced to equal, separately-checked levels. Verify with your dealer or shop manual before servicing. | Komatsu powertrain oil TO-30, the same designation Komatsu specifies for the transmission and steering compartments on this dozer class. |
| Hydraulic system / tank (blade lift/tilt circuit) | Exact tank capacity not confirmed for this serial range. Verify with your dealer or shop manual before servicing. | Komatsu hydraulic oil, factory-graded around ISO VG46 (Komatsu HO-class oil), selected per the OMM's ambient-temperature chart. |
| Pivot shaft / equalizer bar | Not a fluid-fill point — lubricated by grease, not oil. No published fill quantity applies. | Komatsu multipurpose lithium-base chassis grease, applied at the scheduled interval through the equalizer bar/pivot shaft grease fittings. |
| Grease points (track rollers, idlers, linkage, pins) | Not applicable — grease is applied by fitting until purge, not by measured fill volume. | Komatsu multipurpose lithium-base grease (NLGI-graded chassis grease), applied per the OMM's periodic lubrication schedule at each grease fitting. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu DDM053_1A(S/N (80001)-UP (D53A-17)) 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 DDM053_1A(S/N (80001)-UP (D53A-17)) beyond the schedule
Predictive Maintenance & Fluid Analysis
This machine carries no ECM and no onboard diagnostics, so condition monitoring depends entirely on physical sampling. Pull engine oil samples from the 6D125-1 at each oil change to track wear metals and fuel dilution from the mechanical injection pump. Sample TORQFLO transmission and torque converter oil to catch clutch-pack wear before it causes slippage. Test coolant additive concentration regularly since the naturally aspirated engine has no electronic overheat warning beyond the gauge.
Corrective & Common Repairs
Expect recurring work on the mechanical clutch-and-brake steering system: brake band linings and adjustment linkage wear with hour accumulation and cause steering drift if ignored. The mechanical governor and injection pump linkage on the 6D125-1 can drift out of adjustment, affecting idle and throttle response. Track roller and idler seals are common leak points on this undercarriage generation. Radiator core cleaning is a frequent fix since the naturally aspirated engine relies on airflow alone to manage heat under load.
Overhaul & Rebuild Points
Given the platform's age, major rebuild points center on the TORQFLO torque converter and transmission clutch packs, the steering clutch and brake band assemblies, and the final drive gear sets. The mechanical fuel injection pump and injectors on the 6D125-1 eventually need bench calibration or overhaul as wear affects fuel delivery. Undercarriage components (track chain, bushings, rollers, sprockets) are high-wear items on machines this old and are frequently evaluated as a full-set replacement rather than piecemeal repair.
Seasonal & Environment Servicing
Cold starts need attention since the mechanical 6D125-1 has no glow-plug or electronic cold-start assist; use proper cold-weather fuel and battery care to avoid hard starting. In wide-track D53P-17 or swamp D53S-17 configurations, clear mud and debris packed around final drives and track frames regularly to prevent binding. In dusty conditions, service the air cleaner element more often than the standard interval since the naturally aspirated engine is more sensitive to intake restriction than a turbocharged design.
DDM053_1A(S/N (80001)-UP (D53A-17)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 07000-02135 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 130-60-48210 | Element,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 01010-31295 | Bolt, Mount Filter Support | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
DDM053_1A(S/N (80001)-UP (D53A-17)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine Oil Pressure Caution Lamp (red, oil-can symbol) | Engine oil pressure has dropped below the safe minimum threshold | Low engine oil level, worn oil pump, clogged oil filter, or oil pressure sender fault | Stop engine immediately, check oil level and filter condition before restarting |
| Coolant Temperature Caution Lamp / red-zone gauge | Engine coolant temperature has exceeded normal operating range | Low coolant level, radiator core blockage, slipping or broken fan belt, or thermostat failure | Idle down, let engine cool, check coolant level and radiator for debris or leaks |
| Charge Lamp (alternator/battery symbol) | Charging circuit is not supplying current to the battery | Slipping or broken alternator drive belt, worn brushes, or wiring/connection fault | Check belt tension and alternator output; inspect wiring and battery terminals |
| Air Cleaner Restriction Lamp | Engine air intake filter element is clogged, restricting airflow | Dust/debris buildup in the air cleaner element from prolonged operation | Service or replace the air cleaner element per the maintenance schedule |
| Hydraulic Oil Temperature Caution Lamp / gauge | Hydraulic system oil temperature is above normal operating range | Low hydraulic oil level, clogged oil cooler, or sustained high-load operation | Reduce load, idle to allow cooling, check oil level and cooler fins for blockage |
| Torque Converter Oil Temperature Caution Lamp / gauge | Torque converter oil temperature is above normal operating range | Low torque converter oil level, clogged oil cooler, or continuous stall-condition operation | Reduce load, idle to cool, check torque converter oil level and cooler |
| Preheat (glow) Indicator Lamp | Intake air preheater is cycling before a cold start | Normal cold-weather starting aid cycle, not a fault condition | Wait for the lamp to go out before cranking the starter |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DDM053_1A(S/N (80001)-UP (D53A-17)) attachments & work tools
Blades
The factory work-equipment catalog for this D53A-17 arrangement lists Blade and Cutting Edge as separate groups; standard fitment is a straight (S) dozer blade around 3.75 m (12 ft 3 in) wide and about 875 mm (34.5 in) tall, with hydraulic lift and tilt. An angling (A) blade is the other configuration built for this class; semi-U (SU) blades belong to larger Komatsu dozer classes and are not a catalog option here. VPAT is Caterpillar-specific terminology and does not apply to Komatsu machines.
Rippers
Ripper is a listed factory work-equipment group for this machine, mounted at the rear and sharing the machine's single hydraulic gear pump with the blade circuit. Multi-shank parallelogram ripper sets built for this dozer class run roughly 1.1-1.35 t complete with shanks and cylinder; a single-shank parallelogram ripper is the lighter-duty alternative typical for this size class. Exact factory shank count and ripping depth for this specific serial arrangement are not documented — confirm with your dealer.
Winches
A PTO-driven towing winch is offered for the D53A-17/D53S-17 dozer range, mounted at the rear in place of, or alongside, the ripper. Winch families of this size typically sit in the 22-23 t (50,000 lb) bare-drum line-pull class, though the exact rating for this application was not independently confirmed.
Drawbars/counterweights
A rigid-type rear drawbar is the standard fitting for this dozer class, doubling as a tow point when no ripper or winch is installed. No factory counterweight package specific to this arrangement was found; extra rear ballast is typically only called for when a winch is fitted, to offset its added weight.
Cab/ROPS guarding for forestry/waste
Factory documentation tied to this exact model references a radiator guard and cylinder support package built for trimming/brush duty, shielding the front-mounted radiator from branch strikes. Base operator protection is an open ROPS canopy (OROPS); an enclosed ROPS/FOPS cab is the documented alternative for this class, with FOPS Level II screening recommended as a step-up for forestry or waste-handling use.
Hydraulic arrangement (front/rear tools)
Blade lift/tilt and ripper lift/tilt draw from the same engine-driven hydraulic gear pump, split through separate valve sections at the control valve bank — there is no dedicated rear-only hydraulic pump. Where fitted, the towing winch is mechanically PTO-driven off the transmission rather than hydraulically driven, so it does not draw on blade/ripper hydraulic flow.
All DDM053_1A(S/N (80001)-UP (D53A-17)) assemblies by section
Every catalogued assembly group for the Komatsu DDM053_1A(S/N (80001)-UP (D53A-17)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Trimming Dozer
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Blade Control Lever(#(80001)-(83000))
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 5 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Blade Lift Cylinder
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***35 | Bolt,(Without Auto Priming System) | 4 |
| 01***50 | Bolt,(For Trimming Dozer) | 4 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Blade Trimming Cylinder
| 01***11 | Nut,(With Under Mirror) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 07***25 | O-Ring,Cylinder Head | 1 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Electrical System(#(80001)-(83208))
| 01***10 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Electrical System(#(83209)-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***55 | Bolt,(Tree Pusher Dozer) | 2 |
| 01***00 | Bolt, Mount Back-Up Alarm | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Fuel Tank And Piping(#(80001)-(82457))
| 01***12 | Bolt,(With Cylinder Cover) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Fuel Tank And Piping(#(82458)-(83000))
| 01***12 | Bolt,(With Cylinder Cover) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Fuel Tank(#(83001)-)
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 6 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 6 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Control Valve (1/3)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 1 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Control Valve (2/3)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***80 | Bolt, Mount Strainer Flange | 4 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Control Valve (3/3)
| 01***95 | Bolt, Mount Filter Support | 2 |
| 01***36 | Washer,Radio Controlled Slag Handling | 2 |
| 07***30 | O-Ring,Cylinder Head | 1 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Oil Piping
| 01***35 | Bolt,(For Position Fixing) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Oil Piping Cover
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 24 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 14 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 8 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Tank (1/2)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 53 |
| 01***70 | Bolt,(With Wear Guard) | 5 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Hydraulic Tank (2/2)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Modified Parts (1/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 3 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Modified Parts (1/2) (With Steel Cab)(#(83071)-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 14 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Modified Parts (2/2)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 6 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Modified Parts (2/2) (For Cuba)(#(81349)-(83000))
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : Ddm053_1a(S/N (80001)-Up (D53a-17)) : Trimming Dozer : Trimming Dozer
| 01***45 | Bolt | 16 |
| 01***75 | Bolt,R.H | 4 |
| 01***80 | Bolt | 2 |
Frequently asked questions
What engine does the Komatsu DDM053_1A (D53A-17) use?
A Komatsu 6D125-1 naturally aspirated 6-cylinder diesel rated at roughly 128 hp (95 kW) gross at 1900 rpm, with a mechanical inline injection pump and mechanical governor. There is no ECM or electronic engine control on this model.
What is the operating weight of the D53A-17?
Operating weight runs roughly 12.5-13.6 t (28,200-30,000 lb), varying by configuration between the standard-track D53A-17 and the wider-track D53P-17/D53S-17 swamp variants.
What replaced the Komatsu D53A-17?
No confirmed direct successor model is documented for this exact serial range. It belongs to Komatsu's broader D50/D53-series dozer family; check with a Komatsu dealer for the specific generational succession that applies to your unit.
What DDM053_1A(S/N (80001)-UP (D53A-17)) owners discuss
What's the biggest complaint about steering on the D53A-17 and similar D50/D53-series dozers?
Does the TORQFLO transmission and torque converter on this dozer have any known quirks?
What engine quirks show up on the 6D125-1 in this dozer?
What undercarriage wear pattern is typical for this class of Komatsu dozer?
Are there common hydraulic issues with the blade lift/angle circuit?
How do owners keep tabs on engine and charging health without any onboard diagnostics?
What should a buyer check before purchasing a used D53A-17 like this one?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific DDM053_1A(S/N (80001)-UP (D53A-17)) part?
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