705-41-08090 Hydraulic Pump for Komatsu PC40R-7 PC40T-7 PC50UU-2

705-41-08090 Hydraulic Gear Pump for Komatsu PC40-7 PC50UU-2

The 705-41-08090 / 7054108090 hydraulic gear pump is used for Komatsu compact excavator hydraulic system applications. Public supplier references commonly list this pump for Komatsu PC40-7, PC40R-7, PC40T-7 and PC50UU-2 machines. Some references also list BM020C-1 mobile crusher / recycler applications.

This pump should be selected by the original pump number and physical configuration, not by model name alone. Komatsu compact excavators may vary by serial number, hydraulic circuit, pump layout and previous repair history. Final fitment should be verified before ordering.

Cross Reference Numbers

Common reference numbers may include 705-41-08090 and 7054108090. The number 7054108090 is the non-hyphen search format of 705-41-08090.

Some hydraulic pump catalogs describe this product as a Komatsu triple hydraulic gear pump or a 3-stage tandem hydraulic gear pump. These descriptions should be treated as pump type references only and checked against the old pump before purchase.

Application and Fitment Reference

Common model references include PC40-7, PC40R-7, PC40T-7 and PC50UU-2. Some public listings also mention PC50UU-2E and BM020C-1. The model list should be used as fitment guidance, not a universal guarantee.

Before purchase, compare the old pump number, shaft type, mounting hole pattern, hydraulic port direction, pump body shape and rotation direction. Clear photos of the old pump are recommended when the pump label is worn or missing.

Common Failure Symptoms

• Slow hydraulic response: boom, arm, bucket, blade or travel functions respond slowly under load.

• Weak hydraulic force: the compact excavator cannot maintain stable pressure during operation.

• Abnormal pump noise: whining, vibration or cavitation-like sound may indicate air entry, oil restriction or internal wear.

• Oil leakage: leakage may appear around the pump body, shaft seal, port fittings or mounting area.

• Hydraulic oil overheating: worn pump internals, restricted oil flow, blocked filters or relief valve issues may raise oil temperature.

• Metal particles in oil or filters: internal wear or system contamination should be checked before installing a replacement pump.

Troubleshooting Before Replacement

• Check hydraulic oil level, oil condition and contamination.

• Inspect suction lines, return lines, fittings and hydraulic filters.

• Check for air entry, loose connections or collapsed hoses.

• Measure system pressure according to the machine service procedure.

• Inspect relief valves, control valves and related hydraulic components.

• Confirm whether the fault is caused by the pump itself or by blocked filters, worn cylinders, hose restriction, valve faults or contaminated oil.

Installation and Maintenance Notes

• Clean the pump mounting area and hydraulic line connections before removal.

• Cap all open hydraulic ports to prevent dust, water and metal particles from entering the system.

• Inspect or replace hydraulic filters before installing the replacement pump.

• Lubricate or pre-fill the pump according to the service procedure before first startup.

• Check shaft alignment, mounting face, port direction and hose routing before tightening lines.

• Start the machine at low speed first and check for leakage, abnormal noise and unstable pressure.

• Do not operate under heavy load until oil flow, pressure and temperature are confirmed normal.

Fitment Check Before Ordering

To reduce wrong orders, please send the machine model, serial number, old pump part number, pump nameplate photo, shaft photo, mounting face photo and hydraulic port layout photo before quotation.

FAQ

What is the relationship between 705-41-08090 and 7054108090?

7054108090 is the non-hyphen writing format of 705-41-08090. Both formats are commonly used in supplier listings and parts searches.

Which Komatsu models are commonly listed for this pump?

Common model references include Komatsu PC40-7, PC40R-7, PC40T-7 and PC50UU-2. Some public listings also mention PC50UU-2E and BM020C-1. Final fitment should be verified before ordering.

Is this a main hydraulic pump?

This product is better described as a hydraulic gear pump or triple gear pump, not a large excavator hydraulic main pump. The exact function should be confirmed by the old pump and machine hydraulic layout.

What should I check before ordering?

Please check the old pump number, shaft type, mounting hole pattern, hydraulic port direction, pump body shape, rotation direction and machine serial number. Clear photos of the old pump are recommended.

What can cause repeated hydraulic gear pump failure?

Repeated failure may be caused by contaminated hydraulic oil, blocked filters, air entry, restricted suction lines, relief valve problems, incorrect installation or metal particles left in the hydraulic system.