Hydraulic Gear Pump Assembly 705-22-28320 Komatsu HD-785 Dump Truck

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Hydraulic Gear Pump Assembly – Part No. 705-22-28320 for Komatsu HD-785 Dump Truck

This hydraulic gear pump assembly is a genuine replacement component specifically designed for the Komatsu HD-785 dump truck. As a fixed displacement gear pump, it is typically used in auxiliary hydraulic circuits such as pilot control, fan drive, brake release, or lubrication systems. The pump features precision-machined hardened steel gears, a high-strength aluminum or cast iron housing, and self-lubricating bushings, ensuring reliable flow delivery with low noise and high volumetric efficiency. The 705-22-28320 assembly includes the gear housing, drive and driven gears, shaft seal, and mounting flange, all factory-assembled to Komatsu’s exact specifications. Proper operation of this gear pump is essential for maintaining consistent hydraulic pressure in secondary systems, directly impacting machine control responsiveness and cooling performance. Using an authentic Komatsu pump guarantees correct flow rate, pressure rating, and long service life. Regular inspection for leakage, cavitation noise, or pressure drop is recommended, and replacement should be made with genuine Komatsu parts to avoid system degradation.

Part Number	English Product Name
705-22-28320	Hydraulic Gear Pump Assembly (Auxiliary / Pilot)
705-22-28330	Hydraulic Gear Pump – Fan Drive
705-22-28340	Hydraulic Gear Pump – Brake Release
705-22-28350	Hydraulic Gear Pump – Lubrication Circuit
705-22-28360	Gear Pump Drive Coupling
705-22-28370	Pump Mounting Adapter Plate
705-22-28380	Gear Pump Seal Kit (Overhaul)
705-22-28390	Pump Shaft Seal (Front)
705-22-28400	Pump Bearing Kit (Bushing Set)
705-22-28410	Pressure Relief Valve (Integral)
705-95-07121	Main Hydraulic Piston Pump (Hoist/Brake)
705-95-07140	Pilot Pump (Gear Type)
705-95-07240	Pilot Pump Assembly
705-95-07250	Charge Pump for Transmission
705-95-07270	Hydraulic Fan Drive Pump
705-95-07280	Suspension Oil Pump
705-22-28420	Hydraulic Gear Pump – Steering Backup
705-22-28430	Gear Pump Inlet Strainer
705-22-28440	Pump Outlet Hose Assembly (High Pressure)

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Product Detail

Hydraulic Gear Pump Assembly – Part No. 705-22-28320 for Komatsu HD-785 Dump Truck

Part Number	English Product Name
705-22-28320	Hydraulic Gear Pump Assembly (Auxiliary / Pilot)
705-22-28330	Hydraulic Gear Pump – Fan Drive
705-22-28340	Hydraulic Gear Pump – Brake Release
705-22-28350	Hydraulic Gear Pump – Lubrication Circuit
705-22-28360	Gear Pump Drive Coupling
705-22-28370	Pump Mounting Adapter Plate
705-22-28380	Gear Pump Seal Kit (Overhaul)
705-22-28390	Pump Shaft Seal (Front)
705-22-28400	Pump Bearing Kit (Bushing Set)
705-22-28410	Pressure Relief Valve (Integral)
705-95-07121	Main Hydraulic Piston Pump (Hoist/Brake)
705-95-07140	Pilot Pump (Gear Type)
705-95-07240	Pilot Pump Assembly
705-95-07250	Charge Pump for Transmission
705-95-07270	Hydraulic Fan Drive Pump
705-95-07280	Suspension Oil Pump
705-22-28420	Hydraulic Gear Pump – Steering Backup
705-22-28430	Gear Pump Inlet Strainer
705-22-28440	Pump Outlet Hose Assembly (High Pressure)