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SPM-HEP-4599 is the gear driven lubricating oil pump: a cast iron body with the drive and idler gears on the front plate, the pickup bore and the pressure relief valve held by a split pin. It is used on Cummins ISX15 and QSX15 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 Cummins 4955955, Cummins 3100445 and Cummins 4024935.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Oil Pump |
| Replaces | Cummins 4955955 |
| Drive | Gear |
| Engine | Cummins ISX15 / QSX15 / ISZ13 / QSZ13 |
| Cross references | Cummins 3100445, Cummins 4024935 |
| Fits | Cummins ISX15, QSX15, ISZ13 and QSZ13 engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 841330 |
| Country of Manufacture | China |
Cummins machines
Check the part number on your old unit before ordering.
| Cummins Part No.(SPM Part No.) | Fits |
|---|---|
| 4955955(SPM-HEP-4599) | Cummins ISX15, QSX15, ISZ13 and QSZ13 engines |
| 3100445(SPM-HEP-4599) | Cummins ISX15, QSX15, ISZ13 and QSZ13 engines |
| 4024935(SPM-HEP-4599) | Cummins ISX15, QSX15, ISZ13 and QSZ13 engines |
Low oil pressure
A warning light or low gauge reading with the right oil level and a good sender often means a worn oil pump.
Engine rebuilds
Fit a new oil pump whenever the engine is rebuilt or the bearings are changed. Worn gears undo a fresh rebuild.
Noise from the bottom end
Rattles at start-up while the pressure builds are a sign the pump is not priming quickly enough.
Fitting tips
Prime the pump with clean oil, fit new gaskets and O rings, and check the pickup screen before closing up.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (2 aftermarket sellers) | USD 415.00 to 499.32 | 31 Oct 2026 |
| FridayParts | USD 564.51 | 31 Oct 2026 |
| Heavy Duty Kits | USD 621.72 | 2 Nov 2026 |
| Highway and Heavy Parts | USD 623.99 | 2 Nov 2026 |
| SINOCMP | USD 649.00 | 31 Oct 2026 |
| Spare Part Mart | USD 338.80 | Today |
Our price of USD 338.80 is 18% to 48% 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 ISX15, and 3 more listed under compatible equipment. Check the old oil pump is marked 4955955 or one of the cross references, because makers change parts between serial ranges.
On the Cummins ISX15, 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 oil pump.
No. It is an aftermarket oil pump made to replace the Cummins 4955955. 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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