TM 5-3810-306-34
CHECKS a AND b
CHECK c
BENCH CHECK SET UP
a. Pilot pressure adjustment.
2) Apply 20 psi into all ports simultaneously and
observe for external leakage. No leakage
1) Induce 2000 psi into "cylinder" port and 375
allowed.
psi into "pilot pressure" port. Adjust valve
with adjusting bolt to allow 1/4 GPM flow
c.
Free flow check test.
10% out of "valve" port.
1) Pressurize "valve" port to check function of
2) Vary pilot pressure to open and close valve
free flow check. Check valve to crack at 25
several times. Recheck valve at 375 psi
psi.
pilot pressure (and 2000 psi induced into
"cylinder" port) to verify proper adjustment.
2) Induce 25 GPM flow into "valve" port.
Pressure drop through valve not to exceed
b. Leakage test.
70 psi.
1) Induce 2500 psi into "cylinder" port and
4. INSTALL LIFT CYLINDER OVER CENTER VALVE
observe "valve" and "pilot pressure" ports for
ASSEMBLY. (REFER TO TM 5-3810-306-20.)
leakage (5 drops per min. allowed after 2
min.).
END OF TASK
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