Hydraulic Pump 705-51-30290 Suitable for Komatsu Bulldozer D155AX-5 D155A-5 D155A-3

705-51-30290 Hydraulic Gear Pump for Komatsu D155 Bulldozer

The 705-51-30290 / 7055130290 hydraulic gear pump is used for Komatsu D155 bulldozer hydraulic system applications. Public parts references commonly list this pump for D155AX-5, D155A-5 and D155A-3 machines.

This part should be selected by pump number and physical configuration, not by model name alone. D155 series machines may vary by production version, serial number, hydraulic layout and previous repair history. Final fitment should be verified before ordering.

Application and Fitment Reference

Common public references list this pump for Komatsu D155 bulldozer applications, including D155AX-5, D155A-5 and D155A-3. Some supplier references also mention serial number ranges such as D155AX-5 S/N 70001-UP, D155A-3 S/N 60001-UP and D155A-5 S/N 65001-UP.

These model and serial references should be treated as fitment guidance only. Before purchase, compare the old pump number, shaft type, mounting hole pattern, hydraulic port direction, pump body shape and rotation direction.

Cross Reference Note

The number 7055130290 is commonly used as the non-hyphen search format of 705-51-30290. When checking supplier listings or old maintenance records, both formats may appear.

Common Failure Symptoms

• Slow hydraulic response: blade or hydraulic functions move slowly, especially under load.

• Weak hydraulic force: the system 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, contamination 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 and oil condition.

• 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 and related hydraulic control components.

• Confirm whether the failure is caused by the pump itself or by contamination, blocked filters, worn cylinders or valve problems.

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

Is 705-51-30290 used for Komatsu excavators?

Public references mainly list 705-51-30290 for Komatsu bulldozer applications, especially D155AX-5, D155A-5 and D155A-3. It should not be described mainly as an excavator hydraulic pump unless the original pump number and machine configuration confirm that use.

What is the relationship between 705-51-30290 and 7055130290?

7055130290 is the non-hyphen writing format of 705-51-30290. 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 D155AX-5, D155A-5 and D155A-3 bulldozers. Final fitment should be verified by original pump number, machine serial number, shaft, mounting and port 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 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.