Hale MG - Manual (Page 85)

Muscle Pumps
5-21
USE A SPRING COMPRESSOR TO INSTALL
THE PILOT VALVE SPRING. COMPRESSION,
AND COULD BECOME UNCOMPRESSED,
WHICH COULD RESULT IN PERSONAL
INJURY.
ALWAYS REMOVE THE PILOT VALVE
DISCHARGE PRESSURE STRAINER, WHICH
IS LOCATED IN THE TOP OF THE
DISCHARGE SIDE OF THE PUMP. CLEAN OR
REPLACE, AS NECESSARY. FAILURE TO DO
SO COULD RENDER THE PILOT VALVE
INOPERATIVE.
1) Combine both springs, the
adjustment nut, and the discharge
clamp as an assembly and install
into the spring housing. Align the
guide pin adjustment nut with the
slot in the spring housing.
2) Slide the adjustment shaft into the
spring housing from the hand-
wheel end. Turn the adjustment
handwheel counterclockwise in
order to screw the adjustment
shaft into the adjustment nut until
it bottoms in the diaphragm
clamp. Do not put the springs
under tension.
3) Lubricate the new bearing, and
slide the new bearing and bearing
washer over the adjustment shaft
into the spring body housing.
Install the retaining ring. Then,
install the new seal washer and
rotate the adjustment shaft in both
directions to check for freedom of
movement.
4) Install the new diaphragm washer
and diaphragm. Screw the control
valve into the diaphragm clamp.
5) Install the control body. Apply
Loctite 242 to the four 5/16-
18UNC X 1 inch long allen-head
cap screws attaching the control
body to the rear of the spring
housing.
j. Holding the pilot valve, and PMD
indicator assembly if installed, align
the cover plate and install the four
1/4-20UNC X 1 inch long allen-head
cap screws attaching the spring
housing to the pump panel.
k. Install the pump discharge pressure
line and relief valve line to control
body of the pilot valve, attach
electrical wires to the indicator light.
l. Slide the adjustment handwheel onto
the adjustment shaft, and then install
the retaining cap screw and nut.
m. Fill the pump and test the valve for
proper operation and leaks.
2. QD Relief Valve
(Refer to figure 6-15)
a. Drain the pump.
b. Note the location of the wires and
disconnect the indicator light switch.
c. Disconnect the relief valve supply line
from the pilot valve and drain the line.
d. Remove the two 7/16-14UNC X 1-1/4
inch long cap screws attaching the
relief valve indic ator light switch and
the mounting bracket assembly to the
relief valve cover. Remove the light
switch and the bracket.
e. Compress the relief valve return
spring (by hand), and remove the E–
clip and washer. Then, remove the
return spring.