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.
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