22 308981
Service
Diaphragms (Husky 716)
NOTE: Fluid Section Repair Kit D05XXX is available. See page 25 to order the correct kit for your pump. Parts
included in the kit are marked with a double dagger (‡) in Fig. 11 and in the Parts Drawings and Lists. General pur-
pose grease 111920 and Adhesive 113500 are supplied in the kit. Service the diaphragms as follows. See Fig. 11.
Disassembly
Relieve the pressure. See Pressure Relief
Procedure on page 11.
1. Remove the manifolds (102) and fluid covers
(101).
NOTE: Make sure all the check valve parts stay in
place. See Fig. 9.
2. Remove the grounding strip from the vee clamps
(109), and remove the vee clamps.
3. Remove one of the fluid-side diaphragm plates
(133) (whichever one comes loose first when you
use a wrench on the hex of each), and pull the
diaphragm shaft out of the center housing (11).
Overmolded Diaphragms: Grip both diaphragms
securely around the outer edge and rotate counterclock-
wise. One diaphragm assembly will come free and the
other will remain attached to the diaphragm shaft (15).
Remove the freed diaphragm and the air side plate (6).
Pull the other diaphragm assembly and the diaphragm
shaft (15) out of the center housing (11).
4. Use a wrench on the flats of the diaphragm shaft
(15) to remove the other fluid-side diaphragm
plate (133) from the diaphragm shaft.
Overmolded Diaphragms: Use a wrench on the flats of
the diaphragm shaft (15) to remove the second dia-
phragm from the diaphragm shaft.
5. Remove the screws (141) and air covers (136),
and remove all old gasket (12) material from the
ends of the center housing (11) and the surfaces
of the air covers.
6. Remove the diaphragm shaft u-cups (416) and
pilot pin o-rings (1).
7. Inspect all parts for wear or damage, and replace
as necessary.
Reassembly
1. Insert a diaphragm shaft u-cup (416) and a pilot
pin o-ring (1) into the end of the diaphragm
shaft bore of the center housing (11).
NOTE: Make sure the lips of the u-cup face out of the
center housing.
2. Line up the holes in the gasket (12) with the
holes in the end of the center housing (11), and
use six screws (141) to fasten an air cover (136)
to the end of the center housing (11). Torque the
screws to 35 to 45 in-lb (4.0 to 5.1 N-m).
3. Position the exhaust cover (13) and o-ring (4) on
the center housing (11).
4. Repeat steps 1 and 2 for the other end of the
center housing and the remaining air cover.
5. Apply medium-strength (blue) thread locker to
the threads of the screws (140). Install on one
and of the diaphragm shaft (15) the following
parts (see proper order in
Fig. 11): air-side dia-
phragm plate (6), backup diaphragm (402, used
only on models with PTFE diaphragms), dia-
phragm (401), fluid-side diaphragm plate (133),
o-ring (115), and screw (140).
NOTE: The words “AIR SIDE” on the diaphragm (401),
the backup diaphragm (402, used only on models with
PTFE diaphragms), and the flat side of the air-side dia-
phragm plate (6) must face toward the diaphragm shaft
(15).
Overmolded Diaphragms: Assemble the air-side plate
(6) onto the diaphragm (401). The words AIR SIDE on
the air side plate must face away from the diaphragm.
Apply medium-strength (blue) thread locking adhesive
to the threads of the diaphragm assembly. Screw the
assembly into the diaphragm shaft (15) hand tight.
6. Put grease on the diaphragm shaft (15), and
carefully (do not damage the shaft u-cups) run
the diaphragm shaft (15) through the center
housing (11) bore.
7. Repeat step 5 for the other end of the diaphragm
shaft (15), and torque the diaphragm shaft
screws (140) to 80 to 90 in-lb (9 to 10 N-m) at
100 rpm maximum.
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