Excavator Starter Motors
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Hardened pinion drive identified by primary reference 2W-6078 for Caterpillar-style vane air starter systems. Eight exact user-owned photographs show the same 12-tooth pinion and include direct caliper evidence for approximately 57.1mm outside diameter and 28mm thickness. Independent air-starter catalogues identify 2W6078 as the pinion drive used in Caterpillar-style vane air starter systems and record the 12-tooth configuration. The related 7C-3372 number identifies an air-starter assembly family and is not presented as a direct-interchange pinion number. Confirm 12 teeth, 57.1mm outside diameter, 28mm thickness, six-tooth right-hand helical spline and the installed air-starter model before ordering.
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
| Relationship | Reference family | Number |
|---|---|---|
| Primary Part Number | Exact product-folder and catalogue identity | 2W-6078 |
| Same-number Formatting Variant | Punctuation-normalized search alias | 2W6078 |
| Related Mounting / Product Family — Not Direct Interchange | Related Caterpillar air-starter assembly family | 7C-3372 |
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
4 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 Verified system type: Caterpillar-style vane air starter motor, Catalog-recorded engine families: 3412, 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B and 3516C, Catalog-recorded equipment families: 5230/5230B, 776C/776D, 777D, 784B/784C, 785/785B/785C/785D, 789B/789C and 793B/793C, Fitment limitation: Verify 2W-6078, 12 teeth, 57.1mm outside diameter, 28mm thickness, six-tooth RH helical spline and the installed vane air-starter model. Confirm the complete part number and machine serial range before ordering.
Documented direct interchanges: 7C-3372. Formatting aliases for the same number: 2W6078.
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.
