705-51-20640 Pump Assy For Komatsu Bulldozer D61E-12 D61EX-12 D61PX-12

705-51-20640 / 7055120640 Hydraulic Gear Pump for Komatsu D61 D68 Bulldozer

This aftermarket 705-51-20640 / 7055120640 hydraulic gear pump is supplied for Komatsu bulldozer and crawler dozer hydraulic system applications. Public aftermarket references commonly list this pump for Komatsu D61E-12, D61EX-12, D61P-12, D61PX-12 and D68ESS-12 dozer models.

This part should not be treated as a general excavator pump. Because Komatsu D61 and D68 dozers may use different pump configurations by serial number and regional version, final fitment should be confirmed by original pump number, pump body, shaft, port layout, mounting face and machine serial number.

Application and Fitment Reference

• Primary Part Number: 705-51-20640 / 7055120640

• Product Type: Hydraulic Gear Pump / Pump Ass’y

• Machine Category: Komatsu Bulldozer / Crawler Dozer

• Compatible Model References: D61E-12, D61EX-12, D61P-12, D61PX-12, D68ESS-12

• Related Use: Dozer hydraulic / transmission pump reference depending on machine configuration

Common Symptoms That May Require Pump Inspection

• Weak hydraulic response: the related dozer hydraulic function responds slowly or inconsistently.

• Pressure loss: the system cannot maintain stable hydraulic pressure during operation.

• Oil leakage: visible leakage around the pump body, ports, seals or mounting area.

• Abnormal pump noise: whining, vibration or cavitation-like noise during machine operation.

• Overheating or contamination: dirty oil, blocked filters or air entry may accelerate gear pump wear.

Fitment Check Before Ordering

Before ordering this Komatsu 705-51-20640 hydraulic gear pump, please compare it with the original unit. Important confirmation points include part number, shaft type, mounting flange, port direction, pump body shape, hydraulic line connection and machine serial number.

For faster confirmation, please send clear photos of the old pump nameplate, shaft, ports, mounting face and machine model plate. This helps reduce wrong orders and confirms whether 705-51-20640 / 7055120640 is suitable for your Komatsu D61 or D68 bulldozer.

Installation and Maintenance Notes

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

• Inspect hydraulic oil and filters before installing the replacement pump.

• Do not allow dirt or metal particles to enter the pump ports during installation.

• Check the shaft, ports and mounting alignment before tightening hydraulic lines.

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

Ordering Information

Topvelsun supplies aftermarket hydraulic gear pumps, transmission pumps and pump assemblies for Komatsu bulldozers, excavators, loaders, graders and other construction equipment. For this pump, please provide your machine model, serial number, original pump number and photos before quotation.

FAQ

Is 705-51-20640 used for Komatsu excavators?

Public aftermarket references mainly list 705-51-20640 / 7055120640 for Komatsu bulldozer models such as D61E-12, D61EX-12, D61P-12, D61PX-12 and D68ESS-12. It should not be described mainly as an excavator pump without confirming the original part number.

Which Komatsu models are commonly listed for 705-51-20640?

Common model references include Komatsu D61E-12, D61EX-12, D61P-12, D61PX-12 and D68ESS-12 crawler dozers. Some listings include serial-range notes, so final fitment should be checked by machine serial number.

What is the difference between 705-51-20640 and 7055120640?

7055120640 is the non-hyphen writing format of 705-51-20640. Both formats are commonly used in aftermarket searches and supplier listings.

What should I send for fitment confirmation?

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