14
307-730
Diaphragm
(See Fig 14
.)
CAUTION
Replace the diaphragm whenever you remove the
pump housing (9), or after each 100 hours of use,
whichever comes first. During use, small grooves
are formed in the diaphragm which cannot be re-
aligned properly. Reusing a diaphragm may cause
leaking, resulting in costly pump damage.
1. Remove the screws (15). Tip the pump housing (9)
back, being careful not to damage the wires. Re-
move the front cover (23).
2. Check the diaphragm guide (11) in the bottom of the
pump housing (9) and replace it if is worn or dam-
aged. Clean the pump housing thoroughly. Press the
new guide, flat side first, into the housing,
using only
your fingers. Be sure it is installed evenly.
3. Screw the diaphragm (17) out of the connecting rod
assembly (18).
4. Use a soft brass or nylon bristle brush to clean the top
of the connecting rod and housing. Taking care not
to damage the diaphragm grooves, gently clean the
bottom of the pump housing (9).
5. Check the rod, motor bearing and eccentric. If there
is
any
paint or damage, clean or replace the connect-
ing rod assembly as explained on page 15.
6. Screw the new diaphragm (17) into the connecting
rod
just until it
bottoms out. Then turn it 1/8 – 1/4 turn
[about 4–6 in–lb (0.4–0.7 N.m)].
CAUTION
Never turn the diaphragm more than 1/4 turn when
torquing it, as that will prevent the diaphragm from
working properly.
7. Apply thread lubricant to the screws (15) and install
them with the lockwashers (16) in the pump housing.
Torque the screws a few inch–pounds (N.m) at a
time, oppositely and evenly, to 85 in–lb (9.6 N.m).
8. Spin the motor shaft (D) to be sure it turns freely.
9. Reinstall the front cover (23).
Priming Valve & Tube
(See Fig 15.
)
NOTE:
Each new priming valve kit includes a priming
tube and fittings.
1. Unscrew the nut on the handle (E) of the priming
valve (10a). Unscrew the stem of the handle.
2. Screw the priming valve (10a) out of the pump hous-
ing (9).
3. Wrap the threads of the priming valve with
tape. Screw the valve snugly into the pump housing
(9). The valve handle should be parallel with the
angled edge of the housing to avoid interference with
the inlet or outlet valves.
4. Slide the nut (10d) and ferrule (10c) onto the tube
(10e). Install the tube support (10b) in the end of the
tube. Screw the nut onto the priming valve, which will
seat the ferrule.
5. Screw the stem of the handle (E) onto the priming
valve until it bottoms, and then back it out two turns.
Hand tighten the nut onto the priming valve, and then
tighten the stem into the valve.
Fig 14
44
45
47
46
11
17
18
9
23
24
D
LUBRICATE
THREADS;
TORQUE TO
85 in–lb (9.6 N.m)
0298
15,16
Fig 15
45
46
1
9
10
10e
10d
10c
10b
10a
WRAP WITH
TAPE
0786
E
47
48
49
Suction Tube
(See Fig 15.
)
1. Unscrew the nut (45) from the fluid inlet valve hous-
ing (1). Remove the hose clamp (47). Slit the suction
tube to free the nipple (46).
2. With the nipple (46) inserted through the nut (45),
dampen the new hose (44) with warm water and
press the hose over the nipple. Screw the nut onto
the inlet valve housing (1). Press the hose further
onto the nipple, leaving about a 1/8 in. (3 mm) gap
between the nut and hose end.
3. Install the hose clamp (47) and tighten snugly.
4. Remove the filter housing (48) and filter (49) from the
old suction hose. Install these parts on the new hose.
Dampen the hose with warm water to ease the filter
and filter housing onto the hose.
PTFE
PTFE
PTFE
PTFE
PTFE
PTFE
