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Komatsu 708-3S-04541 is the single section hydraulic gear pump with an aluminium body and cast iron centre section, a splined drive and a two bolt mounting flange. It is used on Komatsu PC40MR, PC50MR and PC58UU. 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 Gear Pump |
| Replaces | Komatsu 708-3S-04541 |
| Pump type | Gear pump (pilot pump) |
| Machine | Komatsu PC40MR, PC50MR, PC58UU |
| Drive | Splined shaft |
| Fits | Komatsu PC40MR, PC50MR and PC58UU mini excavators, where it is the pilot (gear) pump on the back of the main pump |
| Condition | New, aftermarket |
| Stat. HS-Code | 841360 |
| Country of Manufacture | China |
Komatsu machines
Check the part number on your old unit before ordering.
| Komatsu Part No.(SPM Part No.) | Fits |
|---|---|
| 708-3S-04541(SPM-HEP-4789) | Komatsu PC40MR, PC50MR and PC58UU mini excavators, where it is the pilot (gear) pump on the back of the main pump |
| 7083S04541(SPM-HEP-4789) | Komatsu PC40MR, PC50MR and PC58UU mini excavators, where it is the pilot (gear) pump on the back of the main pump |
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 |
|---|---|---|
| Kudu Parts | USD 257.00 | 1 Nov 2026 |
| eBay (6 aftermarket sellers) | USD 266.30 to 320.00 | 1 Nov 2026 |
| FridayParts | USD 280.88 | 1 Nov 2026 |
| SINOCMP | USD 299.00 | 1 Nov 2026 |
| Fab Heavy Parts | USD 453.04 | 1 Nov 2026 |
| Spare Part Mart | USD 206.77 | Today |
Our price of USD 206.77 is 20% to 54% 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 Komatsu PC40MR, and 3 more listed under compatible equipment. Check the old hydraulic pump is marked 708-3S-04541 or one of the cross references, because makers change parts between serial ranges.
On the Komatsu PC40MR, 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.
Yes. Fill the pump and its suction line with clean fluid before the first start. Running it dry, even for a few seconds, can score it.
No. It is an aftermarket hydraulic pump made to replace the Komatsu 708-3S-04541. 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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