Excavator Starter Motors
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Denso 128000-5731 is a 24V, 5.5kW, 10-tooth clockwise OSGR starter documented for Caterpillar and Challenger agricultural/industrial equipment. Catalogs cross-reference Cat 3E5381, 6T0380, 7C5731 and the Denso 128000-5730/-5732/-5733 family. Confirm the exact suffix, 24V/5.5kW label, pinion, three-hole mount, engine arrangement and equipment serial before ordering.
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
| Relationship | Reference family | Number |
|---|---|---|
| Primary Manufacturer Part Number | Denso reference | 128000-5731 |
| Manufacturer Suffix Family | Denso references | 128000-5730 / -5732 / -5733 |
| Equipment Cross-References | Cat references | 3E5381 / 6T0380 / 7C5731 / 8C4774 / 9W3748 |
Product fitment guide
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.
Product summary
Before ordering
Machine fitment
2 model references
Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.
Quick fitment answers
Recorded compatible model references include Published equipment: Cat/Challenger tractors and industrial equipment, Fitment limitation: Confirm suffix, rating, teeth, mount, engine arrangement and serial. Confirm the complete part number and machine serial range before ordering.
Manufacturer number: 128000-5730 / -5732 / -5733.
Confirm voltage and power rating against the original starter nameplate. Compare mounting-hole pattern, flange position and overall body orientation. Confirm pinion tooth count and rotation where those values are specified. Send clear photos of the original unit and connector layout when requesting a quote.
