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Cummins 4936877 is the heavy duty alternator of the Delco 22SI type, with a multi rib poly V pulley, cast aluminium drive end with a four hole flange, a rear mounting foot and a black rear cover with the output stud. It is used on Cummins ISB, ISC and ISL 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.
The same part is also sold as Delco Remy 8600437.
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 4936877 |
| Engine | Cummins QSB, ISB, ISBe, ISC, ISL, ISM, ISX |
| Pulley | Multi rib (poly V) |
| Cross references | Delco Remy 8600437 |
| Condition | New, aftermarket |
| Stat. HS-Code | 851150 |
| Country of Manufacture | China |
| Cummins Part No.(SPM Part No.) |
|---|
| 4936877(SPM-HEP-4758) |
| 8600437(SPM-HEP-4758) |
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 222.75 to 237.79 | 31 Oct 2026 |
| SINOCMP | USD 349.00 | 31 Oct 2026 |
| Spare Part Mart | USD 180.43 | Today |
Our price of USD 180.43 is 19% to 48% 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 QSB, and 6 more listed under compatible equipment. Check the old alternator is marked 4936877 or one of the cross references, because makers change parts between serial ranges.
On the Cummins QSB, 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.
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 4936877. 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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