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SPM-HEP-4434 is the 12 volt Denso type planetary gear starter motor with solenoid and 10 tooth pinion. It is used on Case 400 series skid steers. 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 Denso 428000-6030 and Case 87638510.
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 | Denso 428000-6030 |
| Voltage | 12 V |
| Power | 3.0 kW |
| Pinion teeth | 10 |
| Rotation | Clockwise |
| Cross references | Case 87638510 |
| Fits | Case 420, 430, 435, 440, 445, 450 and 465 skid steers, TR270, TR320 and TV380, and New Holland L180 to L230 and C185 to C238 loaders |
| Condition | New, aftermarket |
| Stat. HS-Code | 851140 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Denso Part No.(SPM Part No.) | Fits |
|---|---|
| 428000-6030(SPM-HEP-4434) | Case 420, 430, 435, 440, 445, 450 and 465 skid steers, TR270, TR320 and TV380, and New Holland L180 to L230 and C185 to C238 loaders |
| Brand | Part No. |
|---|---|
| Denso | 428000-6030 |
| Case | 87638510 |
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 Case 420, 430, 435, 440 and 8 more. 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 (8 aftermarket sellers) | USD 169.00 to 279.50 | 29 Oct 2026 |
| BuyMachineryParts | USD 232.00 | 29 Oct 2026 |
| FridayParts | USD 243.60 | 29 Oct 2026 |
| FarmPartsStore | USD 421.51 | 29 Oct 2026 |
| Spare Part Mart | USD 135.20 | Today |
Our price of USD 135.20 is 20% to 68% 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 Case 420, and 11 more listed under compatible equipment. Check the old starter motor is marked 428000-6030 or one of the cross references, because makers change parts between serial ranges.
On the Case 420, 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.
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.
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 Denso 428000-6030. 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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