Grader

PVH98 vickers hydraulic pump grader 120

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. Pr

CAT12G grader hydraulic pump

The CAT12G G120 grader hydraulic pump is a radial piston variable displacement pump with an operating pressure typically between 280 and 320 bar. The pump consists of a rotor, pistons, control valves, and pressure relief components, accurately regulating oil flow within ±5%. Under normal operation, the pump flow ranges from 140 to 180 liters per minute, and oil temperature should not exceed 90°C. Repairs require specialized hydraulic tools and flow/pressure calibration equipment to maintain the manufacturer’s technical specifications.

During the repair process, the pump is removed from the grader, and all components are inspected for wear, scoring, and corrosion. Pistons, rings, and seals are replaced with OEM-standard parts to reduce internal leakage below 2%. The shaft and rotor undergo vibration and balance testing to minimize noise and vibration. Control and pressure valves are tested with precise gauges to ensure smooth, stable flow.

After reassembly, the pump is tested under real pressure and flow conditions. Flow measurements at 75–85°C must stay within ±5 bar of the factory specification. Proper repair extends service life up to 8,000 hours and reduces oil consumption and hydraulic system wear. Routine maintenance every 500 operating hours, including pressur

Komatsu Motor Grader GD825A-2

The Komatsu GD825A-2 motor grader is equipped with an SAA6D140E-2 diesel engine producing 260 horsepower at 2000 RPM. The engine displacement is 8.3 liters, delivering a maximum torque of 1050 N·m at 1400 RPM. The hydraulic system features a 280 L/min pump with 220 bar working pressure, controlling blade, frame, and front attachments. The frame is made of high-strength steel with a bending resistance of 3200 N·m. The main blade measures 4 meters wide and 700 mm high, capable of moving highly compacted soil efficiently. The hydro-mechanical transmission with 6 forward and 3 reverse gears allows precise speed control up to 35 km/h.

The operating weight of the grader is 20.3 tons, and its overall length is 9.8 meters, ensuring stability and maneuverability. Front and rear axles feature independent differential locks with a load capacity of 8.5 tons. The cabin includes an ergonomic vibration-absorbing seat and air conditioning for enhanced operator comfort. The dual-circuit hydraulic braking system and adjustable hydraulic steering provide precise control on slopes and rough terrain. Fuel consumption is approximately 24 liters per hour, and the fuel tank capacity is 250 liters, ensuring high operational efficiency.

Komatsu Motor Grader GD655-6

The Komatsu GD655-6 motor grader is equipped with an SAA6D114E-3 diesel engine producing 215 horsepower at 2000 RPM. The engine displacement is 7.01 liters, delivering a maximum torque of 950 N·m at 1400 RPM. The hydraulic system features a 240 L/min pump with 210 bar working pressure, controlling all blade, moldboard, and front frame operations. The frame is made of high-strength steel with a bending resistance of 2800 N·m. The main blade, measuring 3.8 meters wide and 650 mm high, can cut and move highly compacted soil efficiently. The hydro-mechanical transmission with 6 forward and 3 reverse gears allows precise speed control up to 32 km/h.

The operating weight of the grader is 17.5 tons, and its overall length is 9.2 meters, ensuring stability and maneuverability. Front and rear axles feature independent differential locks with a load capacity of 7.8 tons. The cabin includes air conditioning and an ergonomic vibration-absorbing seat for operator comfort. The dual-circuit hydraulic braking system and adjustable hydraulic steering provide precise control on slopes and tough terrain. Fuel consumption is optimized at approximately 22 liters per hour, and the fuel tank capacity is 200 liters.