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Caterpillar 0R-4894 is the electronic unit injector: the grey body with the plunger spring, the white solenoid cap with the terminal pins and the nozzle with its sealing rings. It is used on Caterpillar 3406E engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Caterpillar 10R-2781 and Caterpillar 118-9030.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Fuel Injector |
| Replaces | Caterpillar 118-9030 |
| Type | Electronic unit injector (EUI) |
| Engine | Caterpillar 3406E |
| Cross references | Caterpillar 10R-2781, Caterpillar 0R-4894 |
| Fits | Caterpillar machines, trucks and gen sets with the 3406E engine |
| Condition | New, aftermarket |
| Stat. HS-Code | 840999 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 118-9030(SPM-HEP-5215) | Caterpillar machines, trucks and gen sets with the 3406E engine |
| 10R-2781(SPM-HEP-5215) | Caterpillar machines, trucks and gen sets with the 3406E engine |
| 0R-4894(SPM-HEP-5215) | Caterpillar machines, trucks and gen sets with the 3406E engine |
What it does
It sprays a metered charge of fuel into the cylinder at the right moment. Spray pattern and opening pressure decide how cleanly the engine burns its fuel.
Where it is used
Made for the Caterpillar machines and trucks and gen sets with the 3406E engine. 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 (4 aftermarket sellers) | USD 361.54 to 423.00 | 3 Nov 2026 |
| SINOCMP | USD 479.00 | 3 Nov 2026 |
| Spare Part Mart | USD 289.23 | Today |
Our price of USD 289.23 is 20% to 40% 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 is a direct replacement for the Caterpillar 0R-4894 with the same fitting.
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.
Always. Fit a new copper washer and O-rings under every injector you remove. A reused washer leaks combustion gas and carbon packs the bore.
No. It is an aftermarket fuel injector made to replace the Caterpillar 0R-4894. 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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