Hydraulic Pump Assembly 705-56-44090 Komatsu HD-785 Dump Truck

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Hydraulic Pump Assembly – Part No. 705-56-44090 for Komatsu HD-785 Dump Truck

This hydraulic pump assembly is a genuine replacement component specifically designed for the Komatsu HD-785 dump truck. It is a high-pressure, variable displacement piston pump typically used as the main hydraulic power source for the dump body hoist circuit, brake charging system, and other primary hydraulic functions. The assembly features a precision-engineered rotating group, heavy-duty bearings, a high-response pressure compensator, and a cast iron housing designed to withstand extreme loads and continuous operation in mining environments. The 705-56-44090 pump assembly includes all necessary components such as the cylinder block, pistons, swashplate, valve plate, and control regulator, factory-assembled to Komatsu’s strict quality standards. Proper function of this pump is critical for safe and efficient hoisting, braking, and steering performance. Using an authentic Komatsu pump ensures correct flow, pressure rating (typically up to 35 MPa), and durability. Regular inspection for noise, leakage, or pressure instability is recommended, and replacement should be made with genuine Komatsu parts to avoid system failure and downtime.

Part Number	English Product Name
705-56-44090	Hydraulic Pump Assembly (Main Hoist/Brake)
705-56-44100	Pump Rotating Group (Cartridge)
705-56-44110	Pump Control Regulator (Pressure Compensator)
705-56-44120	Pump Seal Kit (Overhaul)
705-56-44130	Pump Bearing Kit
705-56-44140	Pump Shaft Seal
705-56-44150	Pump Mounting Flange
705-56-44160	Pump Drive Coupling (Flexible)
705-56-44170	Inlet Strainer Assembly
705-56-44180	Outlet High Pressure Hose
705-22-28320	Hydraulic Gear Pump (Auxiliary / Pilot)
705-95-07121	Hydraulic Piston Pump (Alternate Hoist)
705-95-07240	Pilot Pump Assembly
705-95-07250	Transmission Charge Pump
705-95-07270	Hydraulic Fan Drive Pump
705-22-28380	Gear Pump Seal Kit
705-43-17430	Main Brake Valve Assembly
705-43-12402	Hydraulic Control Valve Assembly
705-06-16770	Pressure Switch
705-43-12540	Accumulator Charging Valve
705-43-12560	Load Sensing Valve

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Product Detail

Hydraulic Pump Assembly – Part No. 705-56-44090 for Komatsu HD-785 Dump Truck

Part Number	English Product Name
705-56-44090	Hydraulic Pump Assembly (Main Hoist/Brake)
705-56-44100	Pump Rotating Group (Cartridge)
705-56-44110	Pump Control Regulator (Pressure Compensator)
705-56-44120	Pump Seal Kit (Overhaul)
705-56-44130	Pump Bearing Kit
705-56-44140	Pump Shaft Seal
705-56-44150	Pump Mounting Flange
705-56-44160	Pump Drive Coupling (Flexible)
705-56-44170	Inlet Strainer Assembly
705-56-44180	Outlet High Pressure Hose
705-22-28320	Hydraulic Gear Pump (Auxiliary / Pilot)
705-95-07121	Hydraulic Piston Pump (Alternate Hoist)
705-95-07240	Pilot Pump Assembly
705-95-07250	Transmission Charge Pump
705-95-07270	Hydraulic Fan Drive Pump
705-22-28380	Gear Pump Seal Kit
705-43-17430	Main Brake Valve Assembly
705-43-12402	Hydraulic Control Valve Assembly
705-06-16770	Pressure Switch
705-43-12540	Accumulator Charging Valve
705-43-12560	Load Sensing Valve