Spindle does not retract

Probable Cause

Check

Remedy

Solenoid-operated air valve or poppet valve not working. Air exhausts from advance valve continuously or will not deactuate. Check for line leaks. Repair or replace valve. Recheck for leaks.
Switch or valve actuators. Check adjustments. Readjust.
Defective "O" rings. "O" ring seals in cylinder assembly and/or directional valve assembly. Replace - Ref. Cylinder Assy. Bul. and Directional Valve Bul.