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SPM-HEP-4757 is the 28 volt, 140 amp brushless heavy duty alternator with a black body, red cooling fan, multi rib pulley on a threaded shaft, three mounting ears and a rear terminal cover with output studs. It is used on Cummins 6C8.3, ISC and L8.9 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.
It replaces Cummins 3415564, Cummins AC172RA301A and Cummins ALP3302AN.
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 | Cummins 3415564 |
| Engine | Cummins 6C8.3, ISC, L8.9 |
| Output | 28 V, 140 A |
| Cross references | AC172RA301A, ALP3302AN |
| Fits | Cummins 6C8.3, ISC and L8.9 diesel engines, including Yutong buses |
| Condition | New, aftermarket |
| Stat. HS-Code | 851150 |
| Country of Manufacture | China |
Cummins machines
Check the part number on your old unit before ordering.
| Cummins Part No.(SPM Part No.) | Fits |
|---|---|
| 3415564(SPM-HEP-4757) | Cummins 6C8.3, ISC and L8.9 diesel engines, including Yutong buses |
| AC172RA301A(SPM-HEP-4757) | Cummins 6C8.3, ISC and L8.9 diesel engines, including Yutong buses |
| ALP3302AN(SPM-HEP-4757) | Cummins 6C8.3, ISC and L8.9 diesel engines, including Yutong buses |
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 |
|---|---|---|
| SINOCMP | USD 589.00 | 31 Oct 2026 |
| eBay (4 aftermarket sellers) | USD 640.90 to 773.51 | 31 Oct 2026 |
| Spare Part Mart | USD 471.20 | Today |
Our price of USD 471.20 is 20% to 39% 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.
Yes, it was made for the Cummins 6C8.3, and 3 more listed under compatible equipment. Check the old alternator is marked 3415564 or one of the cross references, because makers change parts between serial ranges.
On the Cummins 6C8.3, typically 5,000 to 10,000 hours, depending on how often the machine is started and how well the batteries are kept.
A charge warning, low battery voltage with the engine running, flickering lights or bearing noise.
Battery voltage under load, the earth strap and the main cable. A weak supply makes a good alternator look faulty and will burn out the new one.
Disconnect the battery earth before removing the old unit. The main cable is live at full battery current.
No. It is an aftermarket alternator made to replace the Cummins 3415564. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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