520-356-000
2/02 Revision A
Page 15
PILOT VALVE SERVICING
To service the pilot valve first shut off
the compressed air supply, bleed the
pressure from the pump, and disconnect
the air supply line from the pump. Insert
the safety clip (item 1-G from Air
Distribution Valve assembly drawing)
into the smaller unthreaded holes in the
end cap (item 1-F from air distribution
valve assembly drawing).
Step #1:
See PUMP ASSEMBLY
DRAWING.
Using a
7
/
16
" wrench or socket,
remove the four capscrews (items 13).
Remove the air inlet cap (item 8) and
air inlet gasket (item 20). The pilot valve
assembly (item 3) can now be removed
for inspection or service.
Step #2:
Disassembly of the pilot
valve.
Remove the pilot valve spool (item
3-E). Wipe clean, and inspect for dirt,
scratches or wear. Replace the spool if
necessary.
Remove the two spiral retaining rings
(items 3-C) from each end of the pilot
valve body by inserting the tip of a small
flat screw driver under the notch in the
retaining ring. Lift and push the ring
clockwise in a circular motion.
Remove the two pilot valve bushings
(items 3-B), five spacers (items 3-D),
and six spool wipers (items 3-F) by
pushing gently from other end of the
pilot valve body. Inspect the wipers and
spacers for cuts and/or wear. Replace
wipers and/or spacers as necessary.
Step #3:
Re-assembly of the pilot
valve.
First install a spiral retaining ring to
one end of the pilot valve body. Spread
the spiral and insert one end into the
groove in the pilot valve body. Twist the
ring in a clockwise motion until the full
ring is snapped into the groove. Install
one bushing making sure the step side
faces toward the wiper. Apply a light
coating of grease to the outside diameter
of each wiper. Next, gently push in the
wipers and spacers until they are against
the installed retaining ring in the opposite
end of the pilot valve body. Install the
remaining bushing making sure the step
side faces the wiper. Install the remaining
spiral retaining ring using the same
method described.
Apply a light coating of grease to the
inner diameter of each wiper. Also apply
a light coating of grease to the outer
diameter of the pilot valve spool and gently
push the spool through each wiper.
Step #4:
Inspect the actuator
plungers.
See PUMP ASSEMBLY DRAWING.
The actuator plungers (items 30) can
be reached through the stem cavity of
the pilot valve in the intermediate bracket
(item 4). To service bushings, o-rings and
retaining rings, see Intermediate
Drawing.
Remove the plungers (items 30) from
the bushings (item 7) in each end of the
intermediate cavity. Apply a light coating
of grease to each o-ring and re-install
the plungers in to the bushings. Push
the plungers in as far as they will go.
Step #5:
Re-install the pilot valve
assembly into the intermediate
assembly.
Be careful to align the ends of the
stem between the plungers when
inserting the stem of the pilot valve into
the cavity of the intermediate.
Re-install the gasket (item 20), air
inlet cap (item 8) and capscrews (items
13).
Connect the air supply to the pump.
Remove the safety clip (item 1-G) from
the end cap (item 1-F). The pump is now
ready for operation.
Read these instructions
completely, before in-
stallation and start-up. It
is the responsibility of
the purchaser to retain
this manual for reference. Failure to
comply with the recommendations stated
in this manual will damage the pump, and
void factory warranty.
IMPORTANT
To order call 1-800-548-1191 or visit www.partdeal.com - [email protected]
