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The HRR130 Linde hydraulic main pump installed in the Caterpillar D8N bulldozer is a high-pressure axial piston pump designed for industrial earthmoving applications. Its displacement is 130 cc per revolution, and it can generate pressures up to 350 bar. The pump’s housing is made from hardened steel, while pistons, swash plate, and valve components are precision-machined to minimize internal leakage below 2%. Recommended operating temperature is between -20°C and 95°C, and ISO VG46 hydraulic oil ensures optimal lubrication and performance. The pump features a black protective coating to prevent corrosion in harsh working conditions.
Common causes of HRR130 pump failure include contaminated hydraulic fluid, cavitation due to low suction pressure, piston and cylinder block wear, and valve sticking. High operating temperatures accelerate seal degradation, while improper installation can lead to misalignment and premature bearing failure. Internal leakage reduces flow efficiency, causing the bulldozer’s blade or attachments to operate slower than specified. Vibration and noise often indicate shaft or swash plate wear that requires immediate inspection.
Repairing the HRR130 pump involves complete disassembly, inspection, and measurement of all components. Damaged pistons, cylinder blocks, valves, or bearings are replaced with OEM parts. The swash plate and rotor are dynamically balanced, and valves are recalibrated for accurate pressure and flow. After assembly, the pump is tested under simulated load conditions, confirming flow, pressure, and temperature compliance with factory specifications. Properly repaired pumps restore the D8N’s hydraulic performance and can achieve up to 8,000 operating hours with regular oil and filter maintenance.
WEBSITE: Linde HRR130 hydraulic pump D8N bulldozer Iran
