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Denso 228000-7902 is the 24 volt gear reduction starter motor with 10 tooth pinion, solenoid and mounting flange. It is used on Cummins B3.9 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.
The same part is also sold as Cummins 3957593.
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 3957593 |
| Voltage | 24 V |
| Rated power | 4.5 kW |
| Pinion | 10 teeth |
| Cross references | Denso 228000-7902 |
| Fits | Cummins B3.9 (4BT) 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 |
|---|---|
| 3957593(SPM-HEP-4244) | Cummins B3.9 (4BT) engines |
| Brand | Part No. |
|---|---|
| Cummins | 3957593 |
| Denso | 228000-7902 (this page, SPM-HEP-4244) |
All of these numbers are the same part.
Slow or no cranking
With good batteries and cables, a starter that turns slowly or only clicks is worn.
Grinding on engagement
Worn pinion or flywheel teeth grind on start. Check the ring gear when fitting a new starter.
Intermittent starting
Worn brushes and solenoid contacts make starting hit and miss.
Fleet spares
A spare starter keeps a machine working while the old one is rebuilt or scrapped.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| FridayParts | USD 252.92 | 25 Oct 2026 |
| Amazon (Amazon.com) | USD 254.82 | 25 Oct 2026 |
| Amazon (Rareelectrical) | USD 321.39 | 25 Oct 2026 |
| G&T Engine Parts | USD 407.70 | 25 Oct 2026 |
| eBay (2 aftermarket sellers) | USD 420.06 to 427.82 | 25 Oct 2026 |
| Spare Part Mart | USD 202.34 | Today |
Our price of USD 202.34 is 20% to 53% 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 Cummins 3957593. It is not made by or affiliated with Cummins; the Cummins part number is used only to show what it replaces.
It fits Cummins B3.9 (4BT) engines. 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.
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