Excavator Alternators

3020678 24V 45A Alternator for Case 850D 850E 850G

Q: What numbers are documented for 3020678?

Primary Equipment Part Number: 3020678. Published Cummins Equipment Reference: 3284392. Published Case OE Number: AR187916. Official Obsolete Reman Reference: 50950. Published Bosch Manufacturer Number: 0120488206. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 3020678 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.

3020678 24V 45A Alternator for Case 850D 850E 850G, OEM/reference 3020678, 24V 45A Internal-Regulator Alternator, product view 1

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OEM / reference3020678

Specification24V 45A Internal-Regulator Alternator

Catalog ID85281739

Alternator identified by Cummins reference 3020678. Exact-number Cummins records and equipment catalogs specify 24V and 45A. Published Case applications include 850D, 850E and 850G crawler tractors, 1150E/1150G and 1550 crawlers, 9010-9030 excavators and 621-921 loaders. The same records cross-list Case AR187916 and Cummins 3284392. Some suppliers offer a 50A service replacement, but that higher-output substitute is not presented as the original 45A specification. Two matched product-only images show the rear terminals and side mounting. Confirm the OE number, 24V system, 45A rating, pulley/fan requirement, terminals, mount, engine and serial before ordering.

Product Type: Heavy-equipment alternator
System Voltage: 24V
Rated Current: 45A
Regulator: Internal
Polarity: Negative
Rotation: Bi-directional replacement configuration
Output Stud: M8-1.25 on exact replacement record
Pulley and Fan: Application specific; confirm before ordering
Condition: New replacement alternator

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Part-number relationships

Relationship	Reference family	Number
Primary Equipment Part Number	Cummins alternator reference	3020678
Published Cummins Equipment Reference	Same 24V 45A application family	3284392
Published Case OE Number	Equipment cross-reference	AR187916
Official Obsolete Reman Reference	Official replacement lookup; obsolete reman record	50950
Published Bosch Manufacturer Number	Exact 24V 45A replacement-family reference	0120488206

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

3020678

Manufacturer number

0120488206

Remanufactured number

50950

Other documented relationship

3284392
AR187916

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

24V 45A Internal-Regulator Alternator

Category: Excavator Alternators
Catalog ID: 85281739
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.

Machine fitment

Compatible model references

5 model references

Published Case crawler tractors: 850D / 850E / 850G / 1150E / 1150G / 1550
Published Case crawler loaders: 455C / 855D / 855E / 1155E
Published Case excavators: 9010 / 9010B / 9020 / 9020B / 9030 / 9030B
Published Case loaders: 621 / 721 / 821 / 921
Fitment limitation: Confirm 3020678, 24V, 45A, pulley/fan, terminals, mount, engine and serial

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 3020678

Which machines use 3020678?

Recorded compatible model references include Published Case crawler tractors: 850D / 850E / 850G / 1150E / 1150G / 1550, Published Case crawler loaders: 455C / 855D / 855E / 1155E, Published Case excavators: 9010 / 9010B / 9020 / 9020B / 9030 / 9030B, Published Case loaders: 621 / 721 / 821 / 921, Fitment limitation: Confirm 3020678, 24V, 45A, pulley/fan, terminals, mount, engine and serial. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 3020678?

Manufacturer number: 0120488206. Remanufactured references: 50950.

How do I confirm 3020678 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.

Continue comparing verified references from the same system.

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