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SPM-HEP-4817 is the Bosch type CRIN solenoid common rail injector with a two stud terminal, a side high pressure inlet and a body O ring. It is used on Caterpillar C4.4 engines (320D2). 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 Bosch 0445120400 and Caterpillar 449-3315.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Common Rail Fuel Injector |
| Replaces | Bosch 0445120400 |
| Injector type | Solenoid common rail (CRIN) |
| Engine | Caterpillar C4.4 |
| Machine | Caterpillar 320D2 |
| Cross references | Bosch 0445120399, Caterpillar 449-3315 |
| Fits | the Caterpillar C4.4 diesel engine, including the C4.4 in 320D2 excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 840999 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Bosch Part No.(SPM Part No.) | Fits |
|---|---|
| 0445120400 / 0445120399 / Caterpillar 449-3315(SPM-HEP-4817) | the Caterpillar C4.4 diesel engine, including the C4.4 in 320D2 excavators |
| Brand | Part No. |
|---|---|
| Bosch | 0445120400 |
| Caterpillar | 449-3315 |
All of these numbers are the same part.
What it does
A common rail injector opens electrically several times per combustion stroke, spraying fuel at very high pressure. Its timing and flow are set by the engine controller using the trim code on its body.
Where it is used
Made for the Caterpillar C4.4 diesel engine and including the C4.4 in 320D2 excavators. 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 (6 aftermarket sellers) | USD 82.12 to 89.90 | 1 Nov 2026 |
| SINOCMP | USD 129.00 | 1 Nov 2026 |
| FridayParts | USD 178.49 | 1 Nov 2026 |
| Spare Part Mart | USD 65.04 | Today |
Our price of USD 65.04 is 21% to 64% 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 Caterpillar C4.4 diesel engine, and 1 more listed under compatible equipment. Check the old fuel injector is marked 0445120400 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar C4.4 diesel engine, often 5,000 to 10,000 hours, but much less on poor or wet fuel. Injectors are usually changed when they fail a test, not by hours.
Black or white smoke, a misfire or knock on one cylinder, hard starting, higher fuel use, or a high return leak or balance rate on test.
Not always. If the others pass a return leak or balance test, one can be changed. Where they are all high hours, a full set keeps the cylinders even.
Most common rail injectors carry a trim code (QR or IMA) printed on the body. Enter it with a diagnostic tool after fitting, or the engine runs rough and smokes.
No. It is an aftermarket fuel injector made to replace the Bosch 0445120400. 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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