Moog mould movement servo-valve faults

When these servo-valves go faulty it is normally only the pilot stage that is blocked with dirt.

If you suspect the servo-valve is faulty remember to check that the safety solenoid (if fitted) is energised and that the +15V and –15V supply to the servo-valves electronics are present and correct.

If you find that the servo-valve you are fitting (either new or repaired) does not work look to see that the pilot pressure and pilot return are correctly ported. This may involve moving grub screws from one port to another as these are not always factory set to the machines porting.

Many machine have a separate filter in the pilot pressure line and if this is partially blocked the Moog servo-valve will not work properly.