Excavator Starter Motors
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OE starter reference 8605783 cross-references to Denso 428000-2580, 428000-2581 and 428080-2581 in exact replacement catalogs. The published configuration is a 24 V, 4.5 kW clockwise OSGR starter with a 10-tooth pinion. Exact application records cover selected CASE 521D, 521E, 521F, 521G, 521G2, 621G2, 750M and 850M machines plus New Holland LW110B, W110 and W110B loaders. Confirm the complete old-unit number, voltage, output, pinion, flange, terminals, mounting and machine 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 OE Part Number | CASE / New Holland | 8605783 |
| Direct Manufacturer Interchange | Same exact 24V 4.5kW 10T family | 428000-2580, 428000-2581, 428080-2581 |
| Independent New-unit Catalog Number | Exact replacement record | 19857N |
| Lester Catalog Number | Catalog lookup identifier | 19857 |
| Independent Catalog Reference | Exact 4.5kW 24V 10T CASE row | JS1217 |
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
22 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 Case 521D: Year 2000-2008; Engine L4 4.5L 274cid Case 445T/M2, Case 521D: Year 2003-2008; Engine Case 4.5L, Case 521E: Year 2008-2013; Engine L4 4.5L 274cid Case 445TA/EGE, Case 521E: Year 2008-2014; Engine Case 4.5L, Case 521F: Year 2012-2016; Engine FTP 4.5L, Case 521F: Year 2016-2017; Engine L4 4.5L 274cid FPT F4HFE413J, Case 521G: Year 2016-2025; Engine L4 4.5L 274cid Case N45, Case 521G: Year 2017; Engine FTP 4.5L and 14 additional models shown on this page. Confirm the complete part number and machine serial range before ordering.
Manufacturer number: 428000-2580, 428000-2581, 428080-2581.
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.
