26
Section VIII – Overhaul
WARNING
Before breaking any circuit connections, be certain
the electrical power is off and all branches of the
circuit are relieved of trapped pressure. Lower all
vertical cylinders. Discharge or isolate accumula-
tors. Block any load whose movement could cause
injury to personnel or damage to the equipment.
A. Unit Removal
Refer to Figure 15.
1. Thoroughly clean the exterior of the valve and the
area around the valve to prevent contamination of the
system during removal.
2. Remove the valve from its subplate or mounting pad
as follows:
a. If the valve is equipped with the insta-plug feature,
loosen the two slotted screws and unplug the electrical
wiring from the pilot section.
b. If the valve has an air operated pilot section, turn
off air supply and disconnect the pressure lines from the
connection plate.
CAUTION
In the following step make sure electrical power is
off, then disconnect the solenoid wiring. Label each
wire to provide assembly information.
c. If the valve has standard electrically operated
solenoids, remove the four nameplate screw (1) on top of the
pilot section. Move nameplate (2) and gasket (3) aside to
expose interior of the wire cavity. Disconnect solenoid wiring.
d. Loosen the six mounting screws that hold the
main stage section to the mounting pad. Be ready to catch
the fluid retained inside the lines and valve.
e. Remove the valve from the mounting pad and set
it on a clean work bench. Use a chain lift when necessary.
