Excavator Starter Motors
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3904466 is documented in Denso construction-application literature as a Cummins starter for the 4BT 3.9L engine. Electrical catalogs consistently specify 12V, 2.5kW, clockwise rotation and a 13-tooth pinion. Confirm the complete number, oil-sealed or dry configuration, ground terminal, flange, pinion pitch, engine CPL and equipment serial range before ordering.
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
| Relationship | Reference family | Number |
|---|---|---|
| Primary Equipment Part Number | Cummins starter reference | 3904466 |
| Manufacturer Reman Reference | Denso reference | 9712809-021 |
| Catalog Cross-Reference - Verify Configuration | Cummins reference | 3920643 |
| Catalog Cross-Reference - Verify Configuration | Cummins reference | 3926960 |
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
3 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 Engine: Cummins 4BT / 3.9L, Representative equipment: Case, Ford and Versatile loaders/tractors in electrical catalogs, Fitment limitation: Confirm number, seal, ground, flange, pinion pitch, CPL and serial range. Confirm the complete part number and machine serial range before ordering.
Manufacturer number: 9712809-021.
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.
