SANDPIPER M20 Metallic - Manual (Page 23)

m20mdl1sm-rev0114 Model M20 Metallic Page 21
DIAPHRAGM SERVICING
To service the diaphragms first
shut off the suction, then shut off the
discharge lines to the pump. Shut
off the compressed air supply, bleed
the pressure from the pump, and
disconnect the air supply line from the
pump. Drain any remaining liquid from
the pump.
Step #1: See the pump assembly
drawing, and the diaphragm servicing
illustration.
Using a 9/16" wrench or socket,
remove the 16 capscrews (item 9), hex
nuts, and lockwashers that fasten the
manifolds (items 23 & 24) to the outer
chambers (item 14).
Step #2: Removing the outer
chambers.
Using a 11/16" and a 5/8" wrench
or socket, remove the 16 capscrews
(item 10), and hex nuts that fasten the
outer chambers, diaphragms, and inner
chambers together.
Step #3: Removing the diaphragm
assemblies.
Use a 1 1 /
16
" (27mm) wrench or six
pointed socket to remove the diaphragm
assemblies (outer plate, diaphragm,
and inner plate) from the diaphragm rod
(item 34) by turning counterclockwise.
Insert a 1/4-20 capscrew or set
screw into the smaller tapped hole in
the inner diaphragm plate (item 28 or
30). Insert the protruding stud and the
1/4-20 fastener loosely into a vise. Use
a 1 1 /
16
" wrench or socket to remove the
outer diaphragm plate (item 29 or 31) by
turning counter-clockwise. Inspect the
diaphragm (item 16) for cuts, punctures,
abrasive wear or chemical attack.
Replace the diaphragms if necessary.
Step #4: Installing the diaphragms.
Push the threaded stud of the outer
diaphragm plate through the center
hole of the diaphragm. Thread the inner
plate clockwise onto the stud. Insert
the loose assembly with the above 1/4-
20 fastener back into the vise. Use a
torque wrench to tighten the diaphragm
assembly together to 480 in. lbs. (54.23
Newton meters). Allow a minimum of 15
minutes to elapse after torquing, then
re-torque the assembly to compensate
for stress relaxation in the clamped
assembly.
Step #5: Installing the diaphragm
assemblies to the pump.
Make sure the bumper (item 6) is
installed over the diaphragm rod.
Thread the stud of the one diaphragm
assembly clockwise into the tapped
hole at the end of the diaphragm rod
(item 34) until the inner diaphragm plate
is flush to the end of the rod. Insert rod
into pump.
Align the bolt holes in the diaphragm
with the bolt pattern in the inner chamber
(item 15).
Fasten the outer chamber (item 14)
to the pump, using the capscrews (item
9), and hex nuts.
On the opposite side of the pump,
pull the diaphragm rod out as far as
possible. Make sure the bumper (item
6) is installed over the diaphragm rod.
Thread the stud of the remaining
diaphragm assembly clockwise into the
tapped hole at the end of the diaphragm
rod (item 34) as far as possible and still
allow for alignment of the bolt holes in
the diaphragm with the bolt pattern in
the inner chamber (item 15).
Fasten the remaining outer chamber
(item 14) to the pump, using the
capscrews (items 10), hex nuts, and
lockwashers.
Step #6: Re-install the manifolds to
the pump, using the capscrews (item
10), hex nuts and flat washers.
The pump is now ready to be
re-installed, connected and returned to
operation.
OVERLAY DIAPHRAGM SERVICING
The overlay diaphragm (item 16)
is designed to fit over the exterior of the
standard TPE diaphragm (item 18).
One-Piece Bonded DIAPHRAGM
SERVICING (Bonded PTFE with
integral plate)
The one-piece bonded diaphragm
(item 17) has a threaded stud installed
in the integral plate at the factory. The
inner diaphragm plate has a through
hole instead of a threaded hole.
Place the inner plate over the
diaphragm stud and thread the first
diaphragm / inner plate onto the
diaphragms rod only until the inner
plate contacts the rod. Do not tighten.
A small amount of grease may be
applied between the inner plate and the
diaphragm to facilitate assembly.
Insert the diaphragm / rod assembly
into the pump and install the outer
chamber. Turn the pump over and
thread the second diaphragm / inner
plate onto the diaphragm rod. Turn
the diaphragms until the inner plate
contacts the rod and hand tighten
the assembly. Continue tightening
until the bolt holes align with the inner
chamber holes. DO NOT LEAVE THE
ASSEMBLY LOOSE.
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