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SPM-HEP-4442 is the 24 volt starter motor with solenoid, drive housing and 15 tooth pinion. It is used on Mitsubishi S12R and S16R 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 Mitsubishi 37766-20200 and Nikko 0-23000-7171.
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 | Mitsubishi 37766-20200 |
| Voltage | 24 V |
| Power | 7.5 kW |
| Pinion teeth | 15 |
| Cross references | Nikko 0-23000-7171 |
| Fits | Mitsubishi S12R and S16R engines in generator sets and marine units |
| Condition | New, aftermarket |
| Stat. HS-Code | 851140 |
| Country of Manufacture | China |
Mitsubishi machines
Check the part number on your old unit before ordering.
| Mitsubishi Part No.(SPM Part No.) | Fits |
|---|---|
| 37766-20200(SPM-HEP-4442) | Mitsubishi S12R and S16R engines in generator sets and marine units |
| Brand | Part No. |
|---|---|
| Mitsubishi | 37766-20200 |
| Nikko | 0-23000-7171 |
All of these numbers are the same part.
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 Mitsubishi S12R and S16R engines in generator sets and marine units. 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 |
|---|---|---|
| Power Spare Parts | USD 350.00 | 29 Oct 2026 |
| eBay (7 aftermarket sellers) | USD 398.05 to 419.00 | 29 Oct 2026 |
| FridayParts | USD 440.27 | 29 Oct 2026 |
| MyMROmarts | USD 600.99 | 29 Oct 2026 |
| Fab Heavy Parts | USD 660.80 | 29 Oct 2026 |
| Spare Part Mart | USD 291.20 | Today |
Our price of USD 291.20 is 17% to 56% 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 Mitsubishi S12R, and 1 more listed under compatible equipment. Check the old starter motor is marked 37766-20200 or one of the cross references, because makers change parts between serial ranges.
On the Mitsubishi S12R, 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.
Battery voltage under load, the earth strap and the main cable. A weak supply makes a good starter motor look faulty and will burn out the new one.
No. It is an aftermarket starter motor made to replace the Mitsubishi 37766-20200. 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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