High Pressure Rexroth Hydraulic Pump A10VSO28DFR1/31R-VPA12N00 A10VSO28DR/31R-VPA12N00

A7: On-site measurement methods using simple tools:

Flow measurement: Use a 200L measuring bucket and stopwatch—close the system's bypass valve, let the pump discharge oil into the bucket, record the time to fill 100L, and calculate flow (Q = 100L / t). For example, if it takes 100 seconds, Q = 36 L/min. Adjust the FR control knob to reach the target flow.

Pressure adjustment: Install a portable pressure gauge (0-400 bar) at the pump's pressure port, run the pump at no load, gradually close the pressure valve until the gauge reaches the target pressure (e.g., 280 bar), and lock the pressure limiting knob of the FR control valve.

Verification: At rated flow and pressure, the pump's noise should be ≤75 dB, and the case temperature should not exceed 85°C—if not, check for internal leaks.

A8: Disassembly and assembly skills:

Preparation: Mark the relative positions of the flange, housing, and cylinder block with a punch (avoid using markers that contaminate oil); place parts on a clean rubber mat (not metal) to prevent scratches.

Disassembly sequence: First remove the control valve (use a torque wrench to loosen bolts to 20 N*m), then the flange, then the cylinder block—do not forcefully pry the swashplate (use a copper rod to tap gently if stuck).

Component inspection: Use a feeler gauge to measure the gap between the valve plate and cylinder block (normal ≤0.01mm); check the piston shoe's ball socket for cracks (use a magnifying glass).

Assembly precautions: Apply a thin layer of hydraulic oil to all moving parts before assembly; tighten the cylinder block bolts in a crisscross pattern (torque 45 N*m); after assembly, manually rotate the shaft to ensure smooth operation (torque ≤5 N*m).

Post-assembly test: Fill the pump with oil and perform a no-load test for 5 minutes—no leakage or abnormal noise is required.