SANDPIPER S30 Non-Metallic - Manual (Page 28)

s30nmdl2sm-rev0614 Model S30 Non-Metallic Page 26
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-F
from Air Distribution Valve assembly
drawing) into the smaller unthreaded
holes in the end cap (item 1-E from air
distribution valve assembly drawing).
Step #1: See PUMP ASSEMBLY
DRAWING.
Using a 9 /
16
" wrench or socket,
remove the four capscrews (items
10) and four flat washers (items 41).
Remove the air inlet cap (item 8) and
air inlet gasket (item 20). The pilot
valve assembly (item 2) can now be
removed for inspection or service.
Step #2: Disassembly of the pilot
valve.
Remove the pilot valve spool (item
2-F). Wipe clean, and inspect for dirt,
scratches or wear. Replace the spool
if necessary.
Remove the two retaining rings
(items 2-C) from each end of the pilot
valve body using clip ring pliers.
Remove the two pilot valve bushings
(items 2-B), five spacers (items 2-D),
and six spool wipers (items 2-E) by
pushing gently from other end of the
pilot valve body. Inspect the wipers for
cuts and/or wear. Replace any wipers
as necessary.
Step #3: Re-assembly of the pilot
valve.
First install a spiral retaining ring to
one end of the pilot valve body. 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 retaining
ring using clip ring pliers.
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 31)
can be reached through the stem cavity
of the pilot valve in the intermediate
assembly (item 4).
Remove the plungers (items 31) from
the bushings (item 7) in each end of the
cavity. Inspect the installed o-ring (items
28) for cuts and/or wear. Replace the
o-rings if necessary. 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), capscrews and
washers (items 10 and 39).
Connect the air supply to the pump.
Remove the safety clip (item 1-F) from
the end cap (item 1-E). The pump is
now ready for operation.
Read these instructions
c om ple t e ly, be f or e
installation 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