WIL-10140-E-08
Wilden
®
21
Disassembly / Reassembly
Step 4
Remove air valve end cap to expose air
valve spool by simply lifting up on end cap
once air valve bolts are removed.
Step 5
Remove air valve spool from air valve body
by threading one air valve bolt into the end of
the spool and gently sliding the spool out of
the air valve body
.
Inspect seals for signs of
wear and replace entire assembly if
necessary. Use caution when handling air
valve spool to prevent damaging seals.
NOTE:
Seals should not be removed
from assembly. Seals are not sold
separately.
Step 6
Remove pilot spool sleeve retaining snap
ring on both sides of center section with
snap ring pliers.
Step 7
Remove pilot spool sleeve from
center section.
Step 8
With o-ring pick, gently remove the o-ring from
the opposite side of the “center hole” cut on the
spool. Gently remove the pilot spool from
sleeve and inspect for nicks or gouges and
other signs of wear. Replace pilot sleeve
assembly or outer sleeve o-rings if necessary.
During re-assembly never insert the pilot spool
into the sleeve with the “center cut” side first,
this end incorporates the urethane o-ring and
will be damaged as it slides over the ports cut
in the sleeve.
NOTE:
Seals should not be removed from
pilot spool. Seals are not sold separately.
Step 9
Check center section Glyd™ rings for
signs of wear. If necessary, remove
Glyd™ rings with o
-ring pick and replace.
.
