Mechanical Rexroth Plunger Pump A4VSO40LR2/10L-PPB25N00 A4VSO40LR2/10L-PPB13N00 A4VSO40DRG/10L-PPB25N00

A1: Unresponsiveness is typically caused by internal spool jamming or knob mechanical wear. Try these on-site fixes first: ① Knob Mechanical Reset: Pull the knob outward by 5mm and rotate it 360° clockwise, then push back in--this realigns the internal linkage that may have shifted; ② Control Port Flushing: Disconnect the pilot pressure line (port X) for 10 seconds, then reconnect--this purges minor debris blocking the control valve; ③ Pressure Shock Activation: Briefly increase the system pressure to 400 bar (within peak limit) and hold for 2 seconds, then release--this can free a stuck spool by hydraulic force; ④ Lubrication Injection: Inject 0.5ml of food-grade silicone lubricant (compatible with FKM seals) into the knob's side vent hole--avoid oil-based lubricants that contaminate hydraulic fluid. If these steps fail, disassemble the control valve to clean the spool (use diesel and compressed air).

A2: Use the "gravimetric flow method" for on-site efficiency testing: ① Preparation: Ensure the system is at operating temperature (40-60°C); have a 200L calibrated bucket and a digital stopwatch ready; ② Flow Measurement: Close all system bypass valves, direct the pump's pressure line output into the bucket, start the stopwatch when oil begins to flow, and stop when the bucket reaches 100L; record the time (t seconds); ③ Efficiency Calculation: Volumetric efficiency (ηv) = (Actual Flow / Theoretical Flow) × 100%. Actual Flow = (100L / t) × 3.6 (converts to L/min); Theoretical Flow = 71 cm³/r × Motor Speed (rpm) ÷ 1000. For example, at 1500 rpm, Theoretical Flow = 106.5 L/min; if 100L fills in 110 seconds, Actual Flow = 32.7 L/min, ηv = 30.7% (indicates severe internal leakage); ④ Benchmark: ηv ≥95% = normal; 90-95% = minor wear; <90% = require maintenance. This method has an error margin of ±3%--sufficient for on-site judgment.