No Products in the Cart
SPM-HEP-4755 is the 12 volt, 120 amp alternator (14 V charging) with an eight rib poly V pulley, cast aluminium housings with a two arm mounting and a black rear cover with output stud and plug. It is used on Cummins ISF2.8 and ISF3.8 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 5272666 and Cummins 5318121 (current number).
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 5272666 |
| Engine | Cummins ISF2.8, ISF3.8 |
| Output | 12 V (14 V charging), 120 A |
| Cross references | Cummins 5318121 (current number), C5272666, Cummins 5318121 |
| Fits | Cummins ISF2.8 and ISF3.8 diesel engines (Foton and other light trucks, generator sets) |
| 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 |
|---|---|
| 5272666(SPM-HEP-4755) | Cummins ISF2.8 and ISF3.8 diesel engines (Foton and other light trucks, generator sets) |
| 5318121(SPM-HEP-4755) | Cummins ISF2.8 and ISF3.8 diesel engines (Foton and other light trucks, generator sets) |
| C5272666(SPM-HEP-4755) | Cummins ISF2.8 and ISF3.8 diesel engines (Foton and other light trucks, generator sets) |
| Brand | Part No. |
|---|---|
| Cummins | 5272666 |
| Cummins 5318121 (current | number) |
All of these numbers are the same part.
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 (4 aftermarket sellers) | USD 177.99 to 221.10 | 31 Oct 2026 |
| Pieces Discount 24 | USD 300.00 | 31 Oct 2026 |
| SINOCMP | USD 319.00 | 31 Oct 2026 |
| Walmart | USD 381.99 | 31 Oct 2026 |
| Spare Part Mart | USD 142.39 | Today |
Our price of USD 142.39 is 20% to 63% 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 ISF2.8, and 2 more listed under compatible equipment. Check the old alternator is marked 5272666 or one of the cross references, because makers change parts between serial ranges.
On the Cummins ISF2.8, 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.
Check the old unit before you send it away. Pulleys and fans are often fitted to suit the machine and have to be moved across.
Check the exciter or D+ wire, the sense wire and the belt tension. A missing excite feed is the most common reason a good alternator does not charge.
No. It is an aftermarket alternator made to replace the Cummins 5272666. 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.
Join and we put 200 points on your account, worth $10 off an order over $75 USD. Then a point for every dollar you spend after that. Turn points into a discount whenever you like.
Opens the Marty Mates panel. No password: you enter your email, we send a code, and that is you in with your 200 points waiting. Joining signs you up to our emails and you can leave any time from the link in any of them. See our terms and conditions.
Member deals, specials before they go public, and easy ways to stack up points. Plus a nudge when a part you bought is due, so you are not caught out mid job.
You can leave any time from the link in any email we send. See our terms and conditions.
We will only bother you when it is worth it: a member deal, a specials drop, a way to earn points faster, or a heads up that a part you bought is due.
Join Marty Mates and we put 200 points on your account, worth $10 off an order over $75 USD. Then a point for every dollar you spend after that.
No password: you enter your email, we send a code, and that is you in.
