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600-821-3840 24V 15A Alternator for Komatsu D20 D21, OEM/reference 600-821-3840, Alternator, product view 1

5 product photos · Select a thumbnail to change the main view.

Excavator Alternators

600-821-3840 24V 15A Alternator for Komatsu D20 D21

OEM / reference600-821-3840
SpecificationAlternator
Catalog ID53684814

Alternator identified by primary reference 600-821-3840. Catalog-confirmed configuration: 24V, 15A. The cited technical sources record 59 application references. Confirm the complete number, connector or mounting arrangement, and machine serial range before ordering.

Fitment status: Verified · Checked 2026-07-27
Product Type
Alternator
Product Brand
EexcavaStart
Voltage
24V 15A
Technical Specification
15 Amp/24 Volt, CW, 1-Groove Pulley
Design
IR/EF
Voltage
24
Amperage
15
Rotation
CW
Pulley Class
V1
Pulley Note
76.9MM OD
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.

Part-number relationships

RelationshipReference familyNumber
Primary Part NumberSource catalog600-821-3840
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration12253N
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration0-33000-5480
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration0-33000-5510
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration0-33000-5700
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration113212
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration12253
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration12256
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration144-14201
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration166.001.020
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration166.001.020.130
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration166.001.020.710
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration285-125
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration285-130
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration310-003
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration400-50012
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration40796RI
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration600-821-3850
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration600-821-3860
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration612253
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration612256
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configuration90-28-4022
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationA-8821
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationALT29003
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationANK0009
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationAVF-12253
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationAVF-12256
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationCAL50602AS
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationCAL50602GS
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationCAL50620GS
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationF032113212
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationF674091
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationLRA02455
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationRKD15A01
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationX612253
Catalog Cross-Reference - Verify ConfigurationRecorded in the cited catalog family; confirm electrical, mounting and application configurationX612256

Evidence record

Source
Exact-reference evidence retained for internal audit
Evidence grade
catalog-supported
Checked
2026-07-27

Source URLs, catalog files and local evidence paths are stored in the protected product audit record and are not public outbound links.

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
  • 600-821-3840
Other documented relationship
  • 12253N
  • 0-33000-5480
  • 0-33000-5510
  • 0-33000-5700
  • 113212
  • 12253
  • 12256
  • 144-14201
  • 166.001.020
  • 166.001.020.130
  • 166.001.020.710
  • 285-125
  • 285-130
  • 310-003
  • 400-50012
  • 40796RI
  • 600-821-3850
  • 600-821-3860
  • 612253
  • 612256
  • 90-28-4022
  • A-8821
  • ALT29003
  • ANK0009
  • AVF-12253
  • AVF-12256
  • CAL50602AS
  • CAL50602GS
  • CAL50620GS
  • F032113212
  • F674091
  • LRA02455
  • RKD15A01
  • X612253
  • X612256

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

Product summary

Alternator

Category
Excavator Alternators
Catalog ID
53684814
Photo views
5

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

59 model references

  • Recorded application: Make: Komatsu · Model: D20 · Year: 1988-1990 · Engine: 4D95S Engine
  • Recorded application: Make: Komatsu · Model: D21 · Year: 1988-1990 · Engine: 4D95S Engine
  • Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 4D105 Engine
  • Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 6D105 Engine
  • Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 6D95L Engine
  • Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 4D105-5 Engine
  • Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 6D105-5 Engine
  • Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 6D95L Engine
  • Recorded application: Make: Komatsu · Model: D41 · Year: 1986-1995 · Engine: 4D105-5 Engine
  • Recorded application: Make: Komatsu · Model: D41 · Year: 1986-1995 · Engine: 6D105-5 Engine
  • Recorded application: Make: Komatsu · Model: D41 · Year: 1988-1995 · Engine: 6D95L Engine
  • Recorded application: Make: Komatsu · Model: E70Z · Year: 1991-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: E70ZS · Year: 1991-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EC50Z · Year: 1986-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EC50ZS · Year: 1986-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EC50ZSB · Year: 1995-1997 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EC75Z · Year: 1986-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EC75ZS · Year: 1986-1995 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: EG85B · Year: 1986-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: EG85BS · Year: 1986-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD23-10 · Year: 1991-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD25-10 · Year: 1989-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD25-11 · Year: 1989-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD25S-11 · Year: 1989-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD25V-11 · Year: 1989-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD28-10 · Year: 1988-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30-11 · Year: 1988-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30H-11 · Year: 1988-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30S-11 · Year: 1988-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30S-5 · Year: 1988-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30SV-11 · Year: 1990-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD30V-11 · Year: 1990-2007 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40DC · Year: 1986-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40HT · Year: 1986-2007 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40HTE · Year: 1986-1997 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40HTE · Year: 1995-1997 · Engine: 6D105 Engine
  • Recorded application: Make: Komatsu · Model: FD40HWC · Year: 1986-2007 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40HWCE · Year: 1995-2007 · Engine: 6D105 Engine
  • Recorded application: Make: Komatsu · Model: FD40HWCE · Year: 1995-2007 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40S-4 · Year: 1989-1991 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40WC · Year: 1986-2007 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40WCE · Year: 1995-1997 · Engine: 6D105 Engine
  • Recorded application: Make: Komatsu · Model: FD40WCE · Year: 1995-1997 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40Z-4 · Year: 1990-1992 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD40Z-5 · Year: 1993-1995 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD45-4 · Year: 1989-1991 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD45-5 · Year: 1991-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD45H-4 · Year: 1989-1992 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD45S-4 · Year: 1989-1993 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD50E · Year: 1986-1997 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD50H · Year: 1986-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: FD70HE · Year: 1995-1997 · Engine: 6D105 Engine
  • Recorded application: Make: Komatsu · Model: FD70HE · Year: 1995-1997 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: PC60 · Year: 1995-1997 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: PC75U · Year: 1995-1997 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: PC80 · Year: 1995-1997 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: PC90 · Year: 1995-1997 · Engine: 4D95 Engine
  • Recorded application: Make: Komatsu · Model: S23 · Year: 1987-1994 · Engine: 6D95 Engine
  • Recorded application: Make: Komatsu · Model: S23E · Year: 1987-1994 · Engine: 6D95 Engine

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 600-821-3840

Which machines use 600-821-3840?

Recorded compatible model references include Recorded application: Make: Komatsu · Model: D20 · Year: 1988-1990 · Engine: 4D95S Engine, Recorded application: Make: Komatsu · Model: D21 · Year: 1988-1990 · Engine: 4D95S Engine, Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 4D105 Engine, Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 6D105 Engine, Recorded application: Make: Komatsu · Model: D31 · Year: 1988-1995 · Engine: 6D95L Engine, Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 4D105-5 Engine, Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 6D105-5 Engine, Recorded application: Make: Komatsu · Model: D40 · Year: 1986-1995 · Engine: 6D95L Engine and 51 additional models shown on this page. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 600-821-3840?

600-821-3840 is the only classified number in the current evidence record. Send the original nameplate for an alternate-number check.

How do I confirm 600-821-3840 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 recovered references from the same system.

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