SANDPIPER M1F Non-Metallic - Manual (Page 29)

m1fnmdl3sm-rev0713 Model M1F Non-Metallic Page 27
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 composite
repair parts drawing, and the diaphragm
servicing illustration.
Using a 9/16" wrench or socket,
remove the 16 capscrews (items 8), hex
flange nuts and washers that fasten the
elbows (items 18 and 19) to the outer
chambers (items 14). Remove the
elbows with the manifolds and spacers
attached.
Step #2: Removing the outer
chambers.
Using a 9/16" wrench or socket,
remove the 16 capscrews (items 10),
hex flange nuts and washers that fasten
the outer chambers, diaphragms, and
inner chambers (items 15) together.
Step #3: Removing the diaphragm
assemblies.
Use a 1 3 /
8
" (35mm) wrench or
six pointed socket to remove the
diaphragm assemblies (outer plate,
diaphragm, and inner plate) from the
diaphragm rod (item 33) by turning
counterclockwise.
Insert a 1/4-20 capscrew or set
screw into the smaller tapped hole in
the inner diaphragm plate (item 28).
Insert the protruding stud and the 1/4-
20 fastener loosely into a vise. Use
a 1 3 /
8
" wrench or socket to remove
the outer diaphragm plate (item 29)
by turning counter-clockwise. Inspect
the diaphragm (item 116) 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. Use a
torque wrench to tighten the diaphragm
assembly together to 27 ft. Lbs. (36.61
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 5) 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 33)
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). Make sure the molded
directional arrows on the diaphragm
point vertically.
Fasten the outer chamber (item
14) to the pump, using the capscrews
(items 10), hex flange nuts and flat
washers.
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 33) as far as possible and still
allow for alignment of the bolt holes
in the diaphragm with the bolt pattern
in the inner chamber. The molded
directional arrows on the diaphragm
must point vertically.
Fasten the remaining outer chamber
(item 14) to the pump, using the
capscrews (items 10), hex flange nuts
and flat washers.
Step #6: Re-install the elbow/
spacer/manifold assemblies to the
pump, using the capscrews (items 8),
hex flange nuts and flat washers.
The pump is now ready to be
re-installed, connected and returned to
operation.
OVERLAY DIAPHRAGM SERVICING
The PTFE overlay diaphragm (item
17) is designed to fit snugly over the
exterior of the standard TPE diaphragm
(item 16).
The molded directional arrows
on the overlay diaphragm must point
vertically.
Follow the same procedures
described for the standard diaphragm
for removal and installation.
Read these instructions
completely, before
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
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 dia-
phragm 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.
I n s e r t t h e d i a p h r a g m / r o d
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 diaphragm 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.