Komatsu 490-10 Fan Hydraulic Pump, Part No.: 708-1T-00581

Komatsu 490-10 Fan Hydraulic Pump, Part No.: 708-1T-00581 Full Product Introduction

 

1. Basic Product Overview

 

This Komatsu 490-10 Fan Hydraulic Pump with OEM part number 708-1T-00581 is a professional auxiliary power component exclusively designed for Komatsu PC490-10 crawler excavator cooling loop. Differentiated from the main Hydraulic piston pump that supplies power for digging and traveling operations, this dedicated hydraulic pump independently serves the heat dissipation auxiliary circuit within the whole machine’s hydraulic system. It outputs stable pressurized hydraulic oil to drive the cooling fan hydraulic motor, dynamically adjusting fan rotating speed to dissipate heat for the engine, hydraulic oil tank and radiator assembly. Manufactured in strict accordance with Komatsu OEM dimensional standards, it features complete interchangeability for direct replacement during equipment overhaul without reconstructing the original hydraulic system piping and mounting bases, widely adopted in mine excavation, earthmoving and heavy-duty construction scenarios for PC490-10 fleets.

 

Part Number Explanation

 

708-1T-00581 stands for the exclusive factory OEM part number of Komatsu PC490-10 fan drive hydraulic pump, covering original genuine specifications and high-quality aftermarket replacement versions, with unified installation dimensions and oil port layout for universal fitting.

 

2. Core Technical Parameters

 

Item Specification 

Product Designation Auxiliary Fixed Displacement Gear-Type Fan hydraulic pump 

Matching Equipment Komatsu PC490-10 Excavator 

OEM Part Number 708-1T-00581 

Rated Working Pressure 18MPa 

Maximum Peak Pressure 22MPa 

Drive Mode Engine power take-off direct drive 

Pump Body Material High-strength cast iron housing, carburized hardened alloy steel gear pairs 

Sealing Assembly HNBR high-temperature resistant seals as standard; FKM seals optional 

Applicable Medium ISO VG46, VG68 anti-wear hydraulic oil 

Operating Temperature -20℃ ~ +95℃ 

Mounting Form Flange bolt-on installation on engine side bracket 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

Constructed with meshing driving and driven gears, pump casing, front/rear end covers, high-pressure oil ports and heavy-duty shaft seals, this hydraulic pump operates separately from the main Hydraulic piston pump inside the integrated hydraulic system:

 

1. Driven synchronously by the engine power take-off shaft, internal gear rotation generates negative pressure at the suction inlet to draw hydraulic oil from the common reservoir.

2. Hydraulic oil is enclosed within gear tooth grooves and conveyed circumferentially to the high-pressure outlet, delivering regulated pressurized flow to the cooling fan drive motor.

3. System sensors detect real-time temperature of engine coolant and hydraulic oil, and the pump’s output flow regulates fan rotation speed automatically to realize intelligent heat management.

4. After actuating the fan assembly, low-pressure return oil flows back to the tank to complete circulation.

5. It works in parallel with the main Hydraulic piston pump without mutual interference, undertaking the auxiliary cooling task to prevent overheating-induced shutdown and protect the entire hydraulic system from high-temperature aging and oil deterioration.

 

4. Core Product Advantages

 

1. Fully compliant with Komatsu OEM machining benchmarks, the aftermarket hydraulic pump of part number 708-1T-00581 achieves plug-and-play installation, requiring no drilling or pipe modification to the original hydraulic system.

2. Hardened precision gear pairs and heavy-duty high-temperature seals endure prolonged operation in dusty mining and high-load construction environments, resisting minor hydraulic oil contamination effectively.

3. Steady low-pulsation oil output guarantees smooth rotation of the cooling fan motor, avoiding fan vibration that damages the radiator and connecting pipelines.

4. Compact integrated structure occupies limited engine bay space, featuring few leakage points to cut down daily maintenance workload compared to split assembled components.

5. Professional auxiliary loop design lightens the load of the main Hydraulic piston pump, optimizing overall power allocation of the excavator and lowering comprehensive fuel consumption.

6. Strict pressure limiting design prevents overpressure surge to safeguard peripheral components of the hydraulic system.

 

5. Typical Application Scenarios

 

1. Breakdown replacement and periodic overhaul of the fan hydraulic pump for Komatsu PC490-10 excavators on mine and large earthwork projects;

2. Troubleshooting repair for engine frequent overheating, fan stalling or insufficient air volume caused by pump internal wear or oil leakage;

3. Bulk spare parts stocking for machinery repair shops specializing in Komatsu heavy equipment maintenance;

4. Global spare parts supply for overseas construction fleets equipped with PC490-10 excavators.