Hale MG - Manual (Page 88)

Muscle Pumps
5-24
v. Disconnect the electrical connector.
Tighten the entire collet fitting 1 to 1-
1/2 turns. The switch is now in the
proper position. Reconnect the
electrical connector.
w. Fill the pump and test the valve for
proper operation and leaks.
4. PG30 Relief Valve
(Refer to figure 6-12)
a. Drain the pump.
b. Disconnect the indicator light switch.
c. Disconnect the line to the sensing
valve.
d. Remove the 7/16-14UNC X2 inch long
sensing valve mounting cap screw.
e. Remove the four 7/16-14UNC X 1-
3/4 inch long cap screws retaining the
relief valve
assembly to the
atmosphere dump.
f. Remove the four 7/16-14UNC X 1-
1/2 inch long relief valve mounting
cap screws to remove the relief valve
from the pump body.
g. Remove the relief valve assembly.
h. Remove the four 7/16-14UNC X 1-3/4
inch long cap screws retaining the relief
valve cover to the relief valve body.
i. Remove the indicator light switch
assembly.
j. Apply a small amount of pressure to
the relief valve spring, and remove the
spring retaining ring and washer.
Carefully release the pressure held on
the spring and then remove the spring.
k. Remove the relief valve cover.
l. Remove the piston-retaining ring.
m. Remove the relief valve from the
opposite end, sliding the relief valve
stem out of the piston.
n. Reaching through the center hole of
the piston, gently pull the piston from
the indicator switch end of the relief
valve body.
o. Before assembling and installing the
valve, clean and inspect all
components of the relief valve
assembly.
p. Clean all sealing gasket surfaces and
install new O-rings and gaskets.
q. Install the relief valve into the relief
valve body.
r. Slide the piston into the relief valve
body while at the same time sliding
the piston onto the relief valve stem.
Then, install the piston-retaining ring.
s. Install the new gasket, and then install
the cover onto the relief valve body.
t. Install two 7/16-14UNC X 1-3/4 inch
long cap screws finger-tight (to keep
the relief valve cover aligned with the
valve body).
u. Install the valve spring over the relief
valve stem. Then, apply pressure to
the valve spring to compress the
spring.
v. Install the spring washer and the
retaining ring.
w. Remove the two 7/16-14UNC X 1-3/4
inch long cap screws installed to keep
the relief valve cover aligned with the
valve body. Place the indicator switch
bracket into position on the relief
valve cover. Apply Loctite 242 to the
four cap screws, install, and tighten to
53 ft-lb (72 Nm).
x. Apply Loctite 242 to the four 7/16 x
1-1/2 inch long cap screws and install
the new gasket and the relief valve to
the pump surface.