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The Vickers PVH131 hydraulic pump used in the Caterpillar 140G grader is an axial piston variable displacement pump designed for operating pressures up to 300 bar. The pump flow ranges between 131 and 145 cc per revolution, providing hydraulic output with ±5% accuracy. Its housing is made from high-strength steel, and pistons, swash plate, and valves are precision-machined to ensure internal leakage below 2%. The recommended operating temperature range is -20 to 90°C, and ISO VG46 hydraulic oil is advised for optimal performance.
Common failures in PVH131 pumps arise from piston wear, cylinder block scoring, swash plate degradation, or valve clogging. Contaminated fluid or delayed oil replacement can reduce flow, increase internal pressure, and damage rings and O-rings. Shaft or bearing failure is another frequent cause of reduced performance and severe vibration in the 140G grader hydraulic system.
During specialized repair, the pump is fully disassembled, and all components are inspected for wear, corrosion, or damage. Damaged parts are replaced with OEM components, and the shaft and rotor are dynamically balanced. Pressure and flow control valves are recalibrated, and the pump is tested under simulated load conditions. Flow, pressure, and temperature measurements confirm compliance with factory specifications. The repaired pump has a service life of up to 8,000 operating hours, with periodic inspection recommended every 500 hours.
WEBSITE: PVH131 Vickers pump repair Iran
