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Caterpillar 254-5145 is the yellow painted variable displacement axial piston pump with a splined drive shaft, a two bolt mounting flange and the pressure compensator block on the side. It is used on Caterpillar C6.6 machines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Hydraulic Piston Pump |
| Replaces | Caterpillar 254-5145 |
| Type | Variable displacement axial piston pump |
| Drive | Splined shaft, two bolt flange |
| Engine | Caterpillar C6.6 |
| Condition | New, aftermarket |
| Stat. HS-Code | 841360 |
| Country of Manufacture | China |
| Caterpillar Part No.(SPM Part No.) |
|---|
| 254-5145(SPM-HEP-5170) |
Slow or weak hydraulics
A worn pump loses flow and pressure: functions slow down, especially when the oil is hot.
Noise
Whining or knocking from the pump points to worn gears or pistons, or cavitation from a blocked suction line.
Contamination
Metal in the filter or oil means the pump is wearing. Replace it before debris damages valves and motors.
Fitting tips
Flush the system, change the oil and filters, fill the pump case before starting, and run at low speed first.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket seller | USD 1,198.99 | 2 Nov 2026 |
| SINOCMP | USD 1,199.00 | 2 Nov 2026 |
| Buy Machinery Parts | USD 1,369.75 | 2 Nov 2026 |
| FridayParts | USD 1,438.24 | 2 Nov 2026 |
| Fab Heavy Parts | USD 1,761.76 | 2 Nov 2026 |
| Spare Part Mart | USD 943.91 | Today |
Our price of USD 943.91 is 21% to 46% 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 C6.6. Check the old hydraulic pump is marked 254-5145 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar C6.6, 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.
On piston pumps, yes. Fill the case through the drain port with clean hydraulic oil before the first start, or the bearings run dry.
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 hydraulic pump.
No. It is an aftermarket hydraulic pump made to replace the Caterpillar 254-5145. 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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