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Caterpillar 20R-4782 is the Denso HP4 type common rail supply pump: alloy body with the black pumping head, the suction control valve with its plug, bent steel feed pipes, fuel temperature sensor and a taper drive shaft with nut. It is used on Caterpillar C7.1 engines (320E to 329E). 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 Denso 294050-0520 and Caterpillar 368-9041.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Fuel Injection Pump |
| Replaces | Caterpillar 368-9041 |
| Engine | Caterpillar C7.1 |
| Machine | Caterpillar 320E, 323E, 324E, 326, 329E |
| Type | Common rail supply pump (Denso HP4) |
| Cross references | Denso 294050-0520, Caterpillar 20R-4782 |
| Fits | Caterpillar C7.1 engines in the 320E, 323E, 324E, 326 and 329E excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 841330 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 368-9041(SPM-HEP-5135) | Caterpillar C7.1 engines in the 320E, 323E, 324E, 326 and 329E excavators |
| 294050-0520(SPM-HEP-5135) | Caterpillar C7.1 engines in the 320E, 323E, 324E, 326 and 329E excavators |
| 20R-4782(SPM-HEP-5135) | Caterpillar C7.1 engines in the 320E, 323E, 324E, 326 and 329E excavators |
Hard starting and low power
A worn injection pump delivers less fuel at lower pressure: long cranking and weak power under load.
Smoke and uneven running
Uneven delivery between cylinders shows as smoke and rough running.
Fuel leaks
Leaks from the pump body or shaft seal mean it is time to replace it.
Fitting tips
Set the pump timing to the engine maker's figure, bleed the fuel system, and use clean fuel and new filters.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (3 aftermarket sellers) | USD 359.00 to 719.99 | 2 Nov 2026 |
| eHeParts | USD 523.00 | 2 Nov 2026 |
| FridayParts | USD 733.90 | 2 Nov 2026 |
| Buy Machinery Parts | USD 1,064.39 | 2 Nov 2026 |
| Spare Part Mart | USD 290.79 | Today |
Our price of USD 290.79 is 19% to 73% 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 20R-4782 with the same fitting.
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.
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 fuel injection pump.
Clean them right back to metal and fit the new gasket or O-ring dry, unless the engine manual calls for sealant.
No. It is an aftermarket fuel injection pump made to replace the Caterpillar 20R-4782. It is not made by the original manufacturer; the number only shows what it replaces.
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