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The Eaton Vickers PVH98 hydraulic pump used in Caterpillar 120 graders is a variable displacement axial piston pump designed for high-pressure applications up to 280 bar. Its displacement ranges from 98 to 105 cc/rev depending on the swash plate angle, ensuring precise flow control between 120 and 180 liters per minute. The pump housing is made of high-strength alloy steel to withstand mechanical stress, while pistons and valves are precision-machined to maintain internal leakage below 2%. The PVH98 pump supports operating temperatures between -20°C and 90°C, and it requires ISO VG46 hydraulic oil for optimal performance.
During the repair process, the pump is removed and disassembled, with all components inspected for wear, scoring, or corrosion. Pistons, cylinder blocks, swash plates, and seals are replaced using OEM-certified parts. The shaft and rotor are balanced using dynamic testing to minimize vibration. Pressure and flow control valves are calibrated with high-precision gauges to ensure consistent hydraulic output within ±5% of factory specifications.
After reassembly, the pump undergoes bench testing under simulated load conditions. Flow and pressure are measured at various swash plate angles and temperatures to confirm adherence to technical specifications. Properly repaired PVH98 pumps achieve service life of up to 8,000 hours, reduce oil consumption, and prevent damage to the grader’s hydraulic system. Routine inspection and maintenance every 500 operating hours are recommended to ensure consistent performance.
WEBSITE: PVH98 vickers hydraulic pump grader 120 Iran
