Excavator Alternators

1812004821 24V 40A Alternator for Isuzu 6SD1 Hitachi EX330 EX370

Q: What numbers are documented for 1812004821?

Primary Equipment Part Number: 1812004821. Manufacturer Part Number: 101211-6321. Superseded Equipment Number: 1812004820. Related Manufacturer Number: 101211-6320. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 1812004821 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.

1812004821 24V 40A Alternator for Isuzu 6SD1 Hitachi EX330 EX370, OEM/reference 1812004821, 24V 40A Alternator, product view 1

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OEM / reference1812004821

Specification24V 40A Alternator

Catalog ID67946705

24V 40A internally regulated Denso alternator identified by Isuzu number 1812004821 and Denso number 101211-6321. Exact Isuzu and application records support 6SD1/6SD1T engines and Hitachi EX330/EX370 excavators. The prior Isuzu number 1812004820 and Denso 101211-6320 are documented predecessor/replacement-family references. Confirm the three-groove pulley, three-blade plug and machine serial range before ordering.

Product Type: Alternator
Product Brand: EexcavaStart
Voltage: 24V
Rated Current: 40A
Regulator: Internal
Fan: External
Pulley Grooves: 3
Plug: 3-blade
Polarity: Negative ground
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

Relationship	Reference family	Number
Primary Equipment Part Number	Isuzu alternator number	1812004821
Manufacturer Part Number	Denso alternator number	101211-6321
Superseded Equipment Number	Earlier Isuzu alternator number	1812004820
Related Manufacturer Number	Earlier Denso family number; verify configuration	101211-6320

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

1812004821

Manufacturer number

101211-6321
101211-6320

Other documented relationship

1812004820

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

Product summary

24V 40A Alternator

Category: Excavator Alternators
Catalog ID: 67946705
Photo views: 4

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

3 model references

Engine family: Isuzu 6SD1 / 6SD1T
Excavator family: Hitachi EX330 / EX370
Fitment limitation: Confirm 1812004821, pulley, plug, mounting ears 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 1812004821

Which machines use 1812004821?

Recorded compatible model references include Engine family: Isuzu 6SD1 / 6SD1T, Excavator family: Hitachi EX330 / EX370, Fitment limitation: Confirm 1812004821, pulley, plug, mounting ears and serial range. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 1812004821?

Manufacturer number: 101211-6321, 101211-6320.

How do I confirm 1812004821 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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