Alternators

2871A903 24V 100A Alternator for Barber Greene BG8820 BG8820B

Q: What numbers are documented for 2871A903?

Primary Part Number: 2871A903. Source Catalog Number: 20621N. Catalog Cross-Reference - Verify Configuration: 0005011080. Catalog Cross-Reference - Verify Configuration: 05011080. Catalog Cross-Reference - Verify Configuration: 0532342. Catalog Cross-Reference - Verify Configuration: 10443988. Catalog Cross-Reference - Verify Configuration: 11.203.102. Catalog Cross-Reference - Verify Configuration: 11.203.361. Catalog Cross-Reference - Verify Configuration: 11.203.502. Catalog Cross-Reference - Verify Configuration: 11.203.522. Catalog Cross-Reference - Verify Configuration: 11.203.694. Catalog Cross-Reference - Verify Configuration: 11.203.702. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 2871A903 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

1 product photo · Swipe on mobile, or hover and select a thumbnail.

OEM / reference2871A903

SpecificationAlternator

Catalog ID50559798

Product Type: Alternator
Product Brand: EexcavaStart
Technical Specification: 100 Amp/24 Volt, CW, w/o Pulley
Design: IR/IF
Voltage: 24
Rated Output: 100
Rotation: CW
Pulley: w/o Pulley
Condition: New replacement part

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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 Part Number	Exact catalog identity	2871A903
Source Catalog Number	Exact technical catalog record	20621N
Cross-reference (fitment check required)	Exact catalog record; configuration check required	0005011080
Cross-reference (fitment check required)	Exact catalog record; configuration check required	05011080
Cross-reference (fitment check required)	Exact catalog record; configuration check required	0532342
Cross-reference (fitment check required)	Exact catalog record; configuration check required	10443988
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.102
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.361
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.502
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.522
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.694
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.203.702
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.204.166
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.204.244
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.204.255
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.204.258
Cross-reference (fitment check required)	Exact catalog record; configuration check required	11.204.337
Cross-reference (fitment check required)	Exact catalog record; configuration check required	112567
Cross-reference (fitment check required)	Exact catalog record; configuration check required	114767
Cross-reference (fitment check required)	Exact catalog record; configuration check required	173-55201
Cross-reference (fitment check required)	Exact catalog record; configuration check required	20621
Cross-reference (fitment check required)	Exact catalog record; configuration check required	20R-4763
Cross-reference (fitment check required)	Exact catalog record; configuration check required	21827
Cross-reference (fitment check required)	Exact catalog record; configuration check required	21827N
Cross-reference (fitment check required)	Exact catalog record; configuration check required	220 56 60/0
Cross-reference (fitment check required)	Exact catalog record; configuration check required	2205660
Cross-reference (fitment check required)	Exact catalog record; configuration check required	282-30118
Cross-reference (fitment check required)	Exact catalog record; configuration check required	282-558
Cross-reference (fitment check required)	Exact catalog record; configuration check required	282-590
Cross-reference (fitment check required)	Exact catalog record; configuration check required	283701072
Cross-reference (fitment check required)	Exact catalog record; configuration check required	2871A901
Cross-reference (fitment check required)	Exact catalog record; configuration check required	2871A902
Cross-reference (fitment check required)	Exact catalog record; configuration check required	378-9640
Cross-reference (fitment check required)	Exact catalog record; configuration check required	400-29038
Cross-reference (fitment check required)	Exact catalog record; configuration check required	553666RI
Cross-reference (fitment check required)	Exact catalog record; configuration check required	553666RIM
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.080.090
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.100
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.100.090
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.100.098
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.100.311
Cross-reference (fitment check required)	Exact catalog record; configuration check required	566.502.100.312
Cross-reference (fitment check required)	Exact catalog record; configuration check required	706.502.100
Cross-reference (fitment check required)	Exact catalog record; configuration check required	A-6643
Cross-reference (fitment check required)	Exact catalog record; configuration check required	A9214
Cross-reference (fitment check required)	Exact catalog record; configuration check required	A9214(LETRIKA)
Cross-reference (fitment check required)	Exact catalog record; configuration check required	AAK5325
Cross-reference (fitment check required)	Exact catalog record; configuration check required	AAK5554
Cross-reference (fitment check required)	Exact catalog record; configuration check required	AAN5124
Cross-reference (fitment check required)	Exact catalog record; configuration check required	AAN5325

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

2871A903

Cross-reference (fitment check required)

0005011080
05011080
0532342
10443988
11.203.102
11.203.361
11.203.502
11.203.522
11.203.694
11.203.702
11.204.166
11.204.244
11.204.255
11.204.258
11.204.337
112567
114767
173-55201
20621
20R-4763
21827
21827N
220 56 60/0
2205660
282-30118
282-558
282-590
283701072
2871A901
2871A902
378-9640
400-29038
553666RI
553666RIM
566.502.080.090
566.502.100
566.502.100.090
566.502.100.098
566.502.100.311
566.502.100.312
706.502.100
A-6643
A9214
A9214(LETRIKA)
AAK5325
AAK5554
AAN5124
AAN5325

Other documented relationship

20621N

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: 50559798
Photo views: 1

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.

Machine fitment

Compatible model references

13 model references

Exact catalog application: Make: Barber Greene · Model: BG8820 · Year: 2008-2011 · Engine: L6 7.2L 439cid Deutz
Exact catalog application: Make: Barber Greene · Model: BG8820B · Year: 2009-2014 · Engine: L6 6.7L 410cid Volvo
Exact catalog application: Make: Caterpillar · Model: CS66B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4
Exact catalog application: Make: Caterpillar · Model: CS76B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4
Exact catalog application: Make: Caterpillar · Model: CS78B · Year: 2012-2019 · Engine: L6 6.6L 403cid Caterpillar C6.6
Exact catalog application: Make: Caterpillar · Model: CS78B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4
Exact catalog application: Make: Caterpillar · Model: CW34 · Year: 2012-2014 · Engine: L6 6.6L 403cid Caterpillar C6.6
Exact catalog application: Make: Volvo · Model: ABG8820 · Year: 2008-2011 · Engine: L6 7.2L 439cid Deutz
Exact catalog application: Make: Volvo · Model: ABG8820B · Year: 2009-2014 · Engine: L6 6.7L 410cid Volvo
Exact catalog application: Make: Volvo · Model: L45F · Year: 2010-2012 · Engine: L4 4.8L 290cid Volvo
Exact catalog application: Make: Volvo · Model: L50F · Year: 2010-2012 · Engine: L4 4.8L 290cid Volvo
Exact catalog application: Make: Volvo · Model: P8720B · Year: 2017-2019 · Engine: L6 7.1L Volvo
Exact catalog application: Make: Volvo · Model: SD110B · Year: 2009-2014 · Engine: L5 2.4L 147cid Volvo

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 2871A903

Which machines use 2871A903?

Recorded compatible model references include Exact catalog application: Make: Barber Greene · Model: BG8820 · Year: 2008-2011 · Engine: L6 7.2L 439cid Deutz, Exact catalog application: Make: Barber Greene · Model: BG8820B · Year: 2009-2014 · Engine: L6 6.7L 410cid Volvo, Exact catalog application: Make: Caterpillar · Model: CS66B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4, Exact catalog application: Make: Caterpillar · Model: CS76B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4, Exact catalog application: Make: Caterpillar · Model: CS78B · Year: 2012-2019 · Engine: L6 6.6L 403cid Caterpillar C6.6, Exact catalog application: Make: Caterpillar · Model: CS78B · Year: 2012 · Engine: L4 4.4L 269cid Caterpillar C4.4, Exact catalog application: Make: Caterpillar · Model: CW34 · Year: 2012-2014 · Engine: L6 6.6L 403cid Caterpillar C6.6, Exact catalog application: Make: Volvo · Model: ABG8820 · Year: 2008-2011 · Engine: L6 7.2L 439cid Deutz and 5 additional models shown on this page. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 2871A903?

Cross-references are listed in the relationship table above. Compare specifications and the original unit before treating a reference as interchangeable.

How do I confirm 2871A903 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.