Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
Quotation details: MOQ, availability, lead time, item condition (new or remanufactured) and warranty coverage must be confirmed in your quotation before ordering.
Part-number relationships
Relationship
Reference family
Number
Primary Caterpillar Part Number
Official aftermarket 12875N replacement-reference entry
203-5492
Aftermarket Catalog Number
Official verified product interchange record
aftermarket 12875N
Caterpillar Cataloged Replacement Reference
Grouped separately from the primary number
203-5492R
Denso Manufacturer References
Cataloged replacement references
021080-0510 / 102211-3030
Lester Industry Catalog Number
Catalog cross-reference only
12875
Product fitment guide
Part numbers and compatible models
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Reference numbers
Primary number
203-5492
Manufacturer number
021080-0510 / 102211-3030
Other documented relationship
aftermarket 12875N
203-5492R
12875
Formatting aliases are the same number written differently. Cross-references require a specification and fitment check; they do not by themselves confirm direct interchangeability. Related assemblies and remanufactured numbers are separate relationship types.
Product summary
Alternator
Category
Alternators
Catalog ID
53634591
Photo views
2
Before ordering
Confirm these details
Confirm voltage and rated amperage against the original alternator label.
Compare mounting ears, pulley type and pulley-groove count.
Check plug shape, terminal position and regulator connection.
Verify the engine model and machine serial range before ordering.
Published Year Range: 2002-2008 depending on model
Fitment / evidence notes
Fitment Limitation: Confirm 203-5492, 12V/110A label, two-groove pulley, plug, mounting and serial range
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
Common questions about 203-5492
Which machines use 203-5492?
Recorded compatible model references include Caterpillar Equipment: D3G / D4G / D4G LGP / D4G XL / D5G / D5G LGP, Published Engine: Caterpillar 3046, 5.0L diesel, Published Year Range: 2002-2008 depending on model. Recorded fitment/evidence notes: Fitment Limitation: Confirm 203-5492, 12V/110A label, two-groove pulley, plug, mounting and serial range. Confirm the complete part number and machine serial range before ordering.
What numbers are documented for 203-5492?
Manufacturer number: 021080-0510 / 102211-3030.
How do I confirm 203-5492 before ordering?
Confirm voltage and rated amperage against the original alternator label. Compare mounting ears, pulley type and pulley-groove count. Check plug shape, terminal position and regulator connection. Send clear photos of the original unit and connector layout when requesting a quote.
