A10VSO28DFLR/31R-PPA12N00 A10VSO28DFR/31R-PPA12N00 German Rexroth Engineering Systems Mechanical Equipment Genuine Original Hydraulic Pump

A9: Oil emulsification (moisture content >0.1%) handling and prevention: ① Emergency treatment: Drain all emulsified oil, add 5-10L of new oil to flush the system, drain again, then refill with qualified oil; use a vacuum dehydrator to reduce moisture content to ≤0.05% if emulsification is mild; ② Root cause inspection: Check the tank breather (replace if the desiccant turns pink), inspect the cooler for leaks (test with pressure air--bubbles in water indicate leaks), and ensure the tank lid is tightly sealed (prevent rainwater intrusion); ③ Preventive measures: Install a moisture sensor (Rexroth HM 20-2X/315-H-K35) in the tank to alarm when moisture exceeds 0.08%; replace the breather's desiccant monthly in humid areas; store oil in sealed barrels to avoid moisture absorption before use.

A10: Distinction method using systematic testing: ①Preliminary judgment: Disconnect the pump from the hydraulic system (remove pressure and return lines), connect the pump to the motor independently, and fill the pump with oil--if abnormal noise or seizure occurs, it is a mechanical failure; if normal, it is a system failure; ② Mechanical failure verification: Disassemble the pump to check for bearing wear, swashplate deformation, or piston jamming; measure the cylinder block's end face runout (normal ≤0.01mm); ③ System failure verification: Inspect the system's relief valve (check for valve core jamming), directional valve (check for internal leakage), and hoses (check for blockages); measure the system's total leakage (normal ≤1 L/min at 280 bar)--excessive leakage indicates system failure; ④ Auxiliary tool: Use a hydraulic tester (Rexroth VT-HACD-1-1X) to measure the pump's volumetric efficiency (normal ≥95%)--low efficiency with normal mechanical parts indicates system leakage.