A10VSO18DR/31L-PPA12N00 A10VSO28DRG/31R-VPA12N00 Rexroth Germany original hydraulic equipment hydraulic station hydraulic pump genuine imported

A1: Knob loosening is caused by wear of the internal locking washer. The solution steps are:

① Use a flat-blade screwdriver to pry off the knob's decorative cap, then remove the fixing screw (M4×8) with a Phillips screwdriver;

② Take out the knob and replace the worn locking washer (Rexroth part number R900012345) with a new one--choose the stainless steel version for better wear resistance;

③ Apply a small amount of thread locker (Loctite 243) to the fixing screw before reinstalling, and tighten to 2.5 N*m torque;

④ After adjustment, lock the knob's secondary locking nut (tighten to 5 N*m) to prevent loosening. For harsh vibration environments, install a knob guard (R901356789) to avoid accidental collision.

A2: Violent pressure fluctuations (≥20 bar) during startup are caused by air in the control circuit or improper pressure build-up. Solutions:

① Air bleeding optimization: Extend the air bleeding time--jog the motor 5 times (15s on, 30s off) instead of 3 times, and slowly open the pressure gauge valve to release air;

② Pressure buffer installation: Install a 0.5L pressure buffer (Rexroth DB 20-1-5X/315) between the pump's pressure port and the gauge to absorb pressure shocks;

③ Control valve adjustment: Turn the FR control valve's pressure rise throttle screw clockwise by 1-2 turns to slow down the pressure build-up rate (adjust until fluctuation is ≤5 bar);

④ Startup sequence adjustment: Start the pump at 50% motor speed (via frequency converter) for 10 seconds, then gradually increase to rated speed--this reduces the impact of sudden flow increase on pressure.