D155 Komatsu hydraulic pump repair
The hydraulic pumps in Komatsu bulldozer models D65, D85, and D155 are critical components that convert mechanical engine power into hydraulic energy, enabling efficient operation of the dozers blade, steering, and other functions. These pumps are typically piston-type, offering high efficiency and durability under demanding conditions.
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For instance, the Komatsu D65PX-18 model is equipped with a piston-type hydraulic pump delivering a discharge flow of 248 liters per minute 65.5 U.S. gallons per minute at rated engine RPM. The relief valve setting is calibrated to 27.9 MPa approximately 4,050 psi, ensuring optimal pressure regulation within the hydraulic system. This configuration supports the Closed-Center Load Sensing System CLSS, which provides precise and responsive control for efficient simultaneous operations.
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Similarly, the Komatsu D85-18 model features a piston-type hydraulic pump with a discharge flow capacity of 331 liters per minute 87.4 U.S. gallons per minute at rated engine RPM. The relief valve is set at 22.6 MPa approximately 3,270 psi, facilitating the CLSS for enhanced operational efficiency. These specifications ensure that the hydraulic system can handle the high demands of the dozers operations, provid
