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SPM-HEP-4909 is the large heavy duty turbocharger with a twin entry four bolt exhaust inlet flange, a cast iron turbine housing and an aluminium compressor housing. It is used on Cummins K50, KTA50 and QSK50 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 3803338 and Cummins 3801850.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Turbocharger |
| Replaces | Cummins 3803338 |
| Engine | Cummins K50, KTA50, QSK50 |
| Turbine inlet | Twin entry, four bolt flange |
| Cross references | Cummins 3801850 |
| Fits | the Cummins K50, KTA50 and QSK50 diesel engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 841480 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Cummins Part No.(SPM Part No.) | Fits |
|---|---|
| 3803338 / Cummins 3801850(SPM-HEP-4909) | the Cummins K50, KTA50 and QSK50 diesel engines |
| Brand | Part No. |
|---|---|
| Cummins | 3803338 |
| Cummins | 3801850 |
All of these numbers are the same part.
What it does
Exhaust gas spins the turbine, which drives the compressor wheel on the same shaft and pushes more air into the engine. More air lets the engine burn more fuel cleanly, giving the rated power.
Where it is used
Made for the Cummins K50, KTA50 and QSK50 diesel engines. 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 |
|---|---|---|
| SINOCMP | USD 799.00 | 1 Nov 2026 |
| Amazon (LONGXUN) | USD 855.55 | 1 Nov 2026 |
| eBay (5 aftermarket sellers) | USD 860.00 to 945.00 | 1 Nov 2026 |
| Spare Part Mart | USD 639.20 | Today |
Our price of USD 639.20 is 20% to 32% 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 K50, and 2 more listed under compatible equipment. Check the old turbocharger is marked 3803338 or one of the cross references, because makers change parts between serial ranges.
On the Cummins K50, often as long as the engine, 8,000 hours or more, when the oil and air filters are kept on schedule. Most turbos fail early from oil or dirt problems, not age.
Blue or black smoke, a whistle or siren noise, loss of power, oil in the intake or exhaust, or the shaft rubbing the housing.
A little radial play is normal on journal bearing turbos. Wheels touching the housing, or any noticeable end float, are not.
Most failures come from oil starvation, dirty oil, or something passing through the wheels. Find the cause first: a blocked oil feed or dirty air path will kill the new turbocharger too.
No. It is an aftermarket turbocharger made to replace the Cummins 3803338. 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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