Excavator Alternators

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

Q: What numbers are documented for 600-821-3840?

Primary Part Number: 600-821-3840. Related reference - verify configuration: 12253N. Related reference - verify configuration: 0-33000-5480. Related reference - verify configuration: 0-33000-5510. Related reference - verify configuration: 0-33000-5700. Related reference - verify configuration: 113212. Related reference - verify configuration: 12253. Related reference - verify configuration: 12256. Related reference - verify configuration: 144-14201. Related reference - verify configuration: 166.001.020. Related reference - verify configuration: 166.001.020.130. Related reference - verify configuration: 166.001.020.710. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 600-821-3840 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.

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

1 / 5

5 product photos · Swipe on mobile, or hover and select a thumbnail.

OEM / reference600-821-3840

SpecificationAlternator

Catalog ID53684814

Product Type: Alternator
Product Brand: EexcavaStart
Technical Specification: 15 Amp/24 Volt, CW, 1-Groove Pulley
Design: IR/EF
Voltage: 24V
Amperage: 15A
Rotation: CW
Pulley Class: V1
Pulley Note: 76.9MM OD
Condition: New replacement part
Reference limitation: Confirm original-unit ratings, mounting, connections and equipment serial range; related numbers do not guarantee universal interchange.

Send email inquiry Ask on WhatsApp Return to catalog

Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Product reference	600-821-3840
Related reference - verify configuration	Confirm electrical, mounting and application configuration	12253N
Related reference - verify configuration	Confirm electrical, mounting and application configuration	0-33000-5480
Related reference - verify configuration	Confirm electrical, mounting and application configuration	0-33000-5510
Related reference - verify configuration	Confirm electrical, mounting and application configuration	0-33000-5700
Related reference - verify configuration	Confirm electrical, mounting and application configuration	113212
Related reference - verify configuration	Confirm electrical, mounting and application configuration	12253
Related reference - verify configuration	Confirm electrical, mounting and application configuration	12256
Related reference - verify configuration	Confirm electrical, mounting and application configuration	144-14201
Related reference - verify configuration	Confirm electrical, mounting and application configuration	166.001.020
Related reference - verify configuration	Confirm electrical, mounting and application configuration	166.001.020.130
Related reference - verify configuration	Confirm electrical, mounting and application configuration	166.001.020.710
Related reference - verify configuration	Confirm electrical, mounting and application configuration	285-125
Related reference - verify configuration	Confirm electrical, mounting and application configuration	285-130
Related reference - verify configuration	Confirm electrical, mounting and application configuration	310-003
Related reference - verify configuration	Confirm electrical, mounting and application configuration	400-50012
Related reference - verify configuration	Confirm electrical, mounting and application configuration	40796RI
Related reference - verify configuration	Confirm electrical, mounting and application configuration	600-821-3850
Related reference - verify configuration	Confirm electrical, mounting and application configuration	600-821-3860
Related reference - verify configuration	Confirm electrical, mounting and application configuration	612253
Related reference - verify configuration	Confirm electrical, mounting and application configuration	612256
Related reference - verify configuration	Confirm electrical, mounting and application configuration	90-28-4022
Related reference - verify configuration	Confirm electrical, mounting and application configuration	A-8821
Related reference - verify configuration	Confirm electrical, mounting and application configuration	ALT29003
Related reference - verify configuration	Confirm electrical, mounting and application configuration	ANK0009
Related reference - verify configuration	Confirm electrical, mounting and application configuration	AVF-12253
Related reference - verify configuration	Confirm electrical, mounting and application configuration	AVF-12256
Related reference - verify configuration	Confirm electrical, mounting and application configuration	CAL50602AS
Related reference - verify configuration	Confirm electrical, mounting and application configuration	CAL50602GS
Related reference - verify configuration	Confirm electrical, mounting and application configuration	CAL50620GS
Related reference - verify configuration	Confirm electrical, mounting and application configuration	F032113212
Related reference - verify configuration	Confirm electrical, mounting and application configuration	F674091
Related reference - verify configuration	Confirm electrical, mounting and application configuration	LRA02455
Related reference - verify configuration	Confirm electrical, mounting and application configuration	RKD15A01
Related reference - verify configuration	Confirm electrical, mounting and application configuration	X612253
Related reference - verify configuration	Confirm electrical, mounting and application configuration	X612256
Related reference - verify configuration	ARROWHEAD	ANK0009
Related reference - verify configuration	ARROWHEAD	400-50031
Related reference - verify configuration	CARGO	113212
Related reference - verify configuration	J&N Electrical Products	400-50012
Related reference - verify configuration	KOMATSU	600821-3850
Related reference - verify configuration	KOMATSU	600821-3860
Related reference - verify configuration	KOMATSU	F674091
Related reference - verify configuration	KOMATSU REMAN	RKD15A01
Related reference - verify configuration	LESTER	12253
Related reference - verify configuration	LESTER	12256
Related reference - verify configuration	NIKKO	0-33000-5480
Related reference - verify configuration	NIKKO	0-33000-5510
Related reference - verify configuration	NIKKO	0-33000-5700

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

Related assembly

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
400-50031
600821-3850
600821-3860

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

60 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
Komatsu catalog engine references: 4D95L-1P

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 52 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?

Related assembly numbers (not direct interchanges): 12253N, 0-33000-5480, 0-33000-5510, 0-33000-5700, 113212, 12253.

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 verified references from the same system.

Browse this category