Excavator Alternators

424-6821 24V 55A Alternator for Cat C4.4 312D2 313D2 315C 318D2

Q: What numbers are documented for 424-6821?

Primary Equipment Part Number: 424-6821. Same-number Formatting Variant: 4246821. Cross-reference number - verify configuration: 424-6821. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 424-6821 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.

424-6821 24V 55A Alternator for Cat C4.4 312D2 313D2 315C 318D2, OEM/reference 424-6821, 24V 55A Alternator, product view 1

1 / 3

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

OEM / reference424-6821

Specification24V 55A Alternator

Catalog ID72061307

Product Type: Alternator
Product Brand: EexcavaStart
Voltage: 24V
Rated Current: 55A
Condition: New replacement alternator
Mount Hole ID 1: 8.300mm
Mount Hole 1 Type: Unthreaded
Mount Hole 3 Type: Threaded
Alt Mounting Foot ID: 8.300mm
Mounting Ear 2 Thickness: 20mm
Mounting Ear 3 Thickness: 14mm
Alt Mounting Foot Thickness: 14mm
Fan Location: Internal
Regulator Location: Internal
Terminal ID: B+
Terminal Size: M6-1.0
Terminal ID 2: D+
Terminal 2 Size: M5-0.8
Terminal ID 3: W
Terminal 3 Size: M5-0.8
Polarity: Negative
Shaft Pulley OD: 17mm

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 Equipment Part Number	Cat charging-alternator number	424-6821
Same-number Formatting Variant	Compact Cat formatting	4246821
Cross-reference number - verify configuration	Caterpillar	424-6821

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

424-6821

Formatting alias

4246821

Other documented relationship

424-6821

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

Product summary

24V 55A Alternator

Category: Excavator Alternators
Catalog ID: 72061307
Photo views: 3

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

Cataloged engine: Cat C4.4
Cataloged excavators: 312D2 L / 313D2 LGP / 315C / 318D2 L
Additional cataloged engine families: 3054C / 3054E / 3056 / 3056E / C2.2
Fitment limitation: Confirm pulley, mounting pattern, terminals and serial range
Configuration restriction: 24V, 55A configuration only. Confirm the complete original number, mounting, terminal sizes, pulley and equipment serial range. Mount-hole 2 specification requires separate verification.

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 424-6821

Which machines use 424-6821?

Recorded compatible model references include Cataloged engine: Cat C4.4, Cataloged excavators: 312D2 L / 313D2 LGP / 315C / 318D2 L, Additional cataloged engine families: 3054C / 3054E / 3056 / 3056E / C2.2, Fitment limitation: Confirm pulley, mounting pattern, terminals and serial range, Configuration restriction: 24V, 55A configuration only. Confirm the complete original number, mounting, terminal sizes, pulley and equipment serial range. Mount-hole 2 specification requires separate verification.. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 424-6821?

Documented reference numbers (verify configuration; not automatically direct interchanges): 424-6821. See the complete relationship table above. Formatting aliases for the same number: 4246821.

How do I confirm 424-6821 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