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Lit. No. 28270, Rev. 00
July 1, 2005
90
PILOT-OPERATED IN-LINE CHECK VALVE INSPECTION
1. Remove check valve assembly
from manifold block. Using
long/slender needle nose pliers,
remove the spool from the bore.
2. Using a probe, push on the
poppet in the end of the check
valve. It should move freely, then
return to the closed position. If
the poppet sticks open or closed
or binds, replace the check valve
assembly. Clean, repair or
replace as necessary. Inspect
the spool for signs of wear or any
damage indicating it is not
shifting. Look for worn or
damaged O-rings and repair or
replace as necessary.
3. Lubricate all O-rings, and
reinstall the spool by holding the
stem with the needle nose pliers
and carefully inserting it fully into
the bore. Install the check valve
assembly, and tighten to
120–144 in-lb.
Check
Valve
Assembly
Vee
Designation
Spool
Back-Up
Ring
O-Ring
P/O
Check
Valve
O-Ring