Hydraulic Pump 705-51-20930 Compatible with Komatsu D65E-12 D65P-12 D85E-12 D85ESS-12

705-51-20930 Hydraulic Gear Pump for Komatsu D65 D85 Bulldozer

The 705-51-20930 / 7055120930 hydraulic gear pump is supplied for Komatsu bulldozer hydraulic system applications. It is commonly referenced for Komatsu D65 and D85 dozer models, especially D65E-12, D65P-12 and related D85ESS / D85E-SS series machines.

This product is intended for repair shops, equipment owners and parts distributors who need a replacement hydraulic gear pump or pump assembly for Komatsu crawler dozer service. Because pump configurations may vary by machine version, serial number and previous repair history, final fitment should be verified by the original pump number, mounting face, port layout, shaft and machine serial number before ordering.

Product Information

• Part Number: 705-51-20930 / 7055120930

• Product Type: Hydraulic Gear Pump / Pump Assembly

• Machine Category: Komatsu Bulldozer / Crawler Dozer

• Main Model References: D65E-12, D65P-12, D85ESS-2, D85ESS-2A, D85E-SS-2A-E, D85E-SS-2-E

• MOQ: 1 Piece

• Lead Time: 7 - 15 Days, depending on stock and shipping method

Cross Reference Numbers

Common reference numbers may include 705-51-20930, 7055120930, 705-51-20800, 7055120800, 705-51-20A20 and 7055120A20.

These numbers should be used as reference numbers only. Hydraulic gear pumps with similar part numbers may have different port direction, mounting flange, shaft type or pump body configuration. Please compare the old pump before purchase.

Application and Fitment Reference

Public supplier references commonly list this pump for Komatsu bulldozer models such as D65E-12, D65E-12-E, D65P-12, D65P-12-E, D85ESS-2, D85ESS-2A, D85E-SS-2A-E and D85E-SS-2-E.

The model list should be treated as a fitment reference, not a universal guarantee. Before ordering this Komatsu 705-51-20930 hydraulic gear pump, please confirm the original pump part number, machine serial number, shaft type, mounting hole pattern, hydraulic port layout and pump rotation direction.

Common Failure Symptoms

• Slow hydraulic response: blade or hydraulic functions respond slowly under load.

• Weak hydraulic force: the system cannot maintain stable working pressure.

• Abnormal pump noise: whining, vibration or cavitation-like sound may appear during operation.

• Oil leakage: leakage may occur around the pump body, shaft seal, ports or mounting area.

• Hydraulic oil overheating: restricted oil flow, worn pump internals or system contamination 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

Before replacing the hydraulic gear pump, inspect the surrounding hydraulic system. Some hydraulic faults may be caused by contamination, blocked filters, suction line restriction, air entry, relief valve problems or worn hydraulic cylinders rather than the pump alone.

• Check hydraulic oil level, oil condition and contamination.

• Inspect suction lines, return lines and hydraulic filters.

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

• Measure system pressure according to the machine service procedure.

• Inspect relief valves and related hydraulic control components.

• Compare the old pump number and physical configuration before ordering.

Installation and Maintenance Notes

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

• Protect all open hydraulic ports from dust, water and metal particles.

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

• Fill or lubricate the pump according to the service procedure before first startup.

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

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

• Do not operate the machine 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 port layout photo before quotation. This helps confirm whether 705-51-20930 / 7055120930 is suitable for your Komatsu D65 or D85 bulldozer.

FAQ

Is 705-51-20930 used for Komatsu excavators?

Public references mainly list 705-51-20930 for Komatsu bulldozer or crawler dozer applications. 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 705-51-20930 and 7055120930?

7055120930 is the non-hyphen writing format of 705-51-20930. Both formats are commonly used in parts searches and supplier listings.

What are the common cross reference numbers?

Common reference numbers may include 705-51-20930, 7055120930, 705-51-20800, 7055120800, 705-51-20A20 and 7055120A20. These references should be checked against the original pump and machine serial number before purchase.

Which Komatsu models are commonly listed for this pump?

Common model references include Komatsu D65E-12, D65E-12-E, D65P-12, D65P-12-E, D85ESS-2, D85ESS-2A, D85E-SS-2A-E and D85E-SS-2-E. Final fitment should be verified by pump number, mounting, ports, shaft and machine serial number.

What should I send for fitment confirmation?

Please send the machine model, serial number, original pump number, pump nameplate photo, shaft photo, mounting face photo and hydraulic port layout photo.