4WRZ10E1-50-7X/6EG24N9ETK4/M 4WREE10WA75-2X/G24K31/F1V 4WREE10WA50-2X/G24K31/F1V Proportional hydraulic directional valve, Rexroth German made solenoid valve

A: Order Rexroth's original seal kits, disassemble the valve, remove old seals, clean seal grooves, and install new seals (ensure compatibility with hydraulic fluid).

A: Air in the hydraulic system, fluctuating input signal, contaminated fluid, worn spool, or faulty position feedback sensor.

A: Operate the valve at low pressure with the actuator extended/retracted fully, opening bleeder valves (if available) until a steady fluid flow (without bubbles) is observed.

A: Excessive pressure drop, blocked drain port, insufficient fluid flow, or a faulty solenoid drawing excess current.

A: Measure the feedback signal (e.g., 4-20 mA) while shifting the spool manually; the signal should change proportionally to spool travel. No change indicates a faulty sensor.