A I R V A L V E / C E N T E R S E C T I O N D I S A S S E M B L Y
Step 4
Lift away air chamber from center
section and remove center block
gasket. Replace gasket if necessary.
Step 5
Turn assembly over and remove the
pilot spool sleeve from the center
section.
Step 6
Using an O-ring pick, gently remove
the O-ring from the opposite side of
the dimpled end of the pilot spool.
Step 8
Remove modulator spool from
center section. Check for wear to
spool or O-rings and replace if
necessary.
Step 9
Using the appropriate-sized wrench,
loosen the fasteners and lift away
remaining air chamber and center
block gasket from center section.
Replace gasket if necessary.
Step 7
Gently remove the pilot spool from
the sleeve and inspect for nicks,
wear or damage. Replace the pilot
spool assembly or sleeve O-rings
if necessary. During reassembly,
never insert the dimpled end of the
pilot spool first, this will damage the
single urethane O-ring by passing it
over the ports in the pilot sleeve.
NOTE: Seals should not be removed
from the assembly. Seals are not
sold separately.
WIL-11112-E-01
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WILDEN PUMP & ENGINEERING, LLC
