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Caterpillar 321-8932 is the 24 V 85 A alternator with an 8 groove poly V pulley. It is used on Caterpillar 312E to 320D2 GC excavators with the C4.4 and C7.1 engines. This aftermarket version has the same mounting and electrical connector as the original, so it plugs in and bolts on where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Alternator |
| Replaces | Caterpillar 321-8932 |
| Type | Alternator with 8 groove poly V pulley |
| Voltage | 24 V |
| Output | 85 A |
| Fits | Caterpillar 312E; Caterpillar 312F; Caterpillar 313F; Caterpillar 318D2 L; Caterpillar 318E L; Caterpillar 318F L; Caterpillar 320D2 GC |
| Condition | New, aftermarket |
| Stat. HS-Code | 851150 |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 321-8932(SPM-HEP-3122) | Caterpillar 312E, Caterpillar 312F, Caterpillar 313F, Caterpillar 318D2 L, Caterpillar 318E L, Caterpillar 318F L, Caterpillar 320D2 GC |
Battery not charging
A charge warning light or flat batteries every morning point to the alternator once the belt and wiring check out.
Noise
A worn bearing whines or grinds.
Low voltage at idle
Weak output shows as dim lights and slow electrics at idle.
Fit with a new belt
Change the belt and check the tensioner when fitting the alternator.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (10 aftermarket sellers) | USD 229.95 to 289.28 | 7 Oct 2026 |
| Fab Heavy Parts | USD 381.75 | 7 Oct 2026 |
| Spare Part Mart | USD 183.96 | Today |
Our price of USD 183.96 is 20% to 52% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of Caterpillar 321-8932. It is not made by or affiliated with Caterpillar; the Caterpillar part number is used only to show what it replaces.
It fits Caterpillar 312E; Caterpillar 312F; Caterpillar 313F; Caterpillar 318D2 L; Caterpillar 318E L; Caterpillar 318F L; Caterpillar 320D2 GC. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It has the same mounting and electrical connector as the original. Check the plug and terminals match your old part, and test it before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your postcode.
In USD for the quantity selected. The exact cost is confirmed at checkout.
