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SPM-HEP-4447 is the engine coolant pump: cast iron body, bearing and shaft, mechanical seal and impeller, with flange hub and back plate. It is used on Nissan SD22 and SD25 forklift engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
It replaces Nissan 21010-37726 and Nissan 21010-37526.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Water Pump |
| Replaces | Nissan 21010-37726 |
| Cross references | Nissan 21010-37526 |
| Fits | Nissan SD22 and SD25 engines in Nissan forklifts (QF01A10V, QF01A18V, QF02A25U, CQF02A30V, QGF02M30U) |
| Condition | New, aftermarket |
| Stat. HS-Code | 841330 |
| Country of Manufacture | China |
Nissan machines
Check the part number on your old unit before ordering.
| Nissan Part No.(SPM Part No.) | Fits |
|---|---|
| 21010-37726(SPM-HEP-4447) | Nissan SD22 and SD25 engines in Nissan forklifts (QF01A10V, QF01A18V, QF02A25U, CQF02A30V, QGF02M30U) |
| 21010-37526(SPM-HEP-4447) | Nissan SD22 and SD25 engines in Nissan forklifts (QF01A10V, QF01A18V, QF02A25U, CQF02A30V, QGF02M30U) |
What it does
It circulates coolant through the block, head and radiator. A worn seal or bearing lets coolant out and the engine overheat.
Where it is used
Made for the Nissan SD22, SD25 engines in Nissan forklifts (QF01A10V, QF01A18V, QF02A25U and 2 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 98.00 to 120.64 | 29 Oct 2026 |
| FridayParts | USD 139.13 | 29 Oct 2026 |
| Forklift Parts World | USD 139.95 | 30 Oct 2026 |
| Spare Part Mart | USD 80.56 | Today |
Our price of USD 80.56 is 18% to 42% 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 Nissan SD22, and 5 more listed under compatible equipment. Check the old water pump is marked 21010-37726 or one of the cross references, because makers change parts between serial ranges.
On the Nissan SD22, often 5,000 to 10,000 hours with clean fluid, much less with dirt or air in the system. It is usually changed on condition, not by hours.
Leaks from the seal or weep hole, noise or whining, overheating, or falling pressure or flow under load.
Clean them right back to metal and fit the new gasket or O-ring dry, unless the engine manual calls for sealant.
Most failures come from contamination, cavitation from a restricted inlet, or running low on fluid. Check the inlet and the fluid before fitting the new water pump.
No. It is an aftermarket water pump made to replace the Nissan 21010-37726. 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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