SANDPIPER M20 Metallic - Manual (Page 25)

m20mdl1sm-rev0114 Model M20 Metallic Page 23
ACTUATOR PLUNGER SERVICING
To service the actuator plunger first
shut off the compressed air supply,
bleed the pressure from the pump, and
disconnect the air supply line from the
pump.
Step #1: See PUMP ASSEMBLY
DRAWING.
Using a 1/2" wrench or socket,
remove the four capscrews (items 11).
Remove the air inlet cap (item 8) and
air inlet gasket (item 21). The pilot valve
assembly (item 4) can now be removed.
Step #2: Inspect the actuator
plungers.
See ILLUSTRATION AT RIGHT.
The actuator plungers (items 32)
can be reached through the pilot valve
cavity in the intermediate assembly
(item 5).
Remove the plungers (item 32) from
the bushings (item 7) in each end of
the cavity. Inspect the installed o-ring
(items 27) 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.
To remove the bushings (item
7), first remove the retaining rings
(item 33) by using a flat screwdriver.
NOTE: It is recommended that new
retaining rings be installed.
Step #3: 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 21),
air inlet cap (item 8) and capscrews
(item 11).
Connect the air supply to the pump.
The pump is now ready for operation.
Actuator Plunger Drawing
27
7
33
32
5
Read these instructions
completely, before
i n s t a l l a t i o n a n d
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