Repair
14 311688L
Replace the Diaphragms
Diaphragm Repair Kit 246011 is available. Parts
included in the kit are marked, for example (9*). For the
best results, replace both diaphragms.
Always replace the ball check seals (29) whenever the
fluid covers are removed. These seals are included in
each of the repair kits.
1. Prepare the pump for repair of the cylinder-side dia-
phragm.
a. Remove the 6 bolts (39) and fluid cover (37)
from the housing side of the pump.
b. Press on the exposed diaphragm (9) to fully
extend the cylinder-side diaphragm.
c. Replace the housing-side cover and tighten the
6 bolts.
NOTE: The housing-side cover must be reassembled
tightly enough to prevent the shaft from turning when
the cylinder-side diaphragm is loosened.
2. Repair the cylinder-side diaphragm.
a. Remove the 6 bolts (38) and fluid cover (37)
from the cylinder side.
b. Remove the ball check seals (29).
c. The exposed diaphragm should be in the fully
extended position (protruding out from the cylin-
der). If it is not, reassemble the cylinder-side
seals and cover and repeat step 1.
d. Grip the cylinder-side diaphragm firmly and
unscrew it from the rod by hand.
e. Install a new diaphragm (9*) firmly, by hand.
3. Prepare the pump for repair of the housing-side dia-
phragm.
a. Press on the cylinder-side diaphragm so that it
protrudes into the cylinder. This will fully extend
the diaphragm on the housing side.
b. Install new ball check seals (29*).
c. Make sure the helicoil (56) is in place in each
bolt hole. See Helicoil Installation, page 15.
d. Replace the fluid cover and install the 6 bolts.
Torque the bolts to 16 N•m (12 ft-lb). Use blue
Loctite or equivalent as needed. See General
Repair Notes, page 13.
4. Repair the housing-side diaphragm.
a. Remove the 6 bolts and the fluid cover from the
housing side.
b. Remove the ball check seals.
c. The exposed diaphragm should be in the fully
extended position (protruding out from the cylin-
der). If it is not, reassemble the cylinder-side
seals and cover and repeat step 3.
d. Grip the housing-side diaphragm firmly and
unscrew it from the rod by hand.
e. Install a new diaphragm (9*) firmly, by hand.
f. Install new ball check seals (29*).
g. Make sure the helicoil (56) is in place in each
bolt hole. See Helicoil Installation, page 15.
h. Replace the fluid cover and install the 6 bolts
(39*). Torque the bolts to 16 N•m (12 ft-lb). Use
blue thread locker as needed. See General
Repair Notes, page 13.
Spare diaphragms should be stored in a cool, dry place
and be used within 8 months to prevent diaphragm fail-
ure due to material aging.
Wear gloves when removing or assembling the dia-
phragms to reduce the risk of cuts.
