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Cummins 31791000 is the 24 V reduction starter: a silver nose housing with a 12 tooth pinion, a black field frame and a side mounted solenoid. It is used on Cummins ISM 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 Cummins 3102765.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Starter Motor |
| Replaces | Cummins 3102765 |
| Voltage | 24 V |
| Engine | Cummins ISM / NT855 |
| Cross references | Cummins 31791000 |
| Fits | Cummins ISM and NT855 engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 851140 |
| Country of Manufacture | China |
Cummins machines
Check the part number on your old unit before ordering.
| Cummins Part No.(SPM Part No.) | Fits |
|---|---|
| 3102765(SPM-HEP-4587) | Cummins ISM and NT855 engines |
| 31791000(SPM-HEP-4587) | Cummins ISM and NT855 engines |
What it does
The solenoid throws the pinion into the flywheel ring gear and the motor turns the engine over until it fires.
Where it is used
Made for the Cummins ISM and NT855 engines. The full list is in the tables above.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (3 aftermarket sellers) | USD 292.82 to 566.60 | 31 Oct 2026 |
| FridayParts | USD 431.45 | 31 Oct 2026 |
| SINOCMP | USD 459.00 | 31 Oct 2026 |
| Spare Part Mart | USD 234.26 | Today |
Our price of USD 234.26 is 20% to 59% 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 ISM, and 1 more listed under compatible equipment. Check the old starter motor is marked 31791000 or one of the cross references, because makers change parts between serial ranges.
On the Cummins ISM, typically 5,000 to 10,000 hours, depending on how often the machine is started and how well the batteries are kept.
Clicking with a good battery, slow cranking, grinding as it engages, or the starter staying engaged after the engine fires.
Yes. Look at the flywheel teeth through the starter opening. Chewed teeth will damage the new pinion.
Disconnect the battery earth before removing the old unit. The main cable is live at full battery current.
No. It is an aftermarket starter motor made to replace the Cummins 31791000. 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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