12
859.0089
Diaphragms and Center Section
Disassembly
NOTE:
Diaphragm kits are available in a range of mate-
rials and styles. See page 26 to order the correct dia-
phragms for your pump. A Center Rebuild Kit also is
available. See page 19. Parts included in the Center
Rebuild Kit are marked with an *. For best results, use
all kit parts.
1. Follow the
on page 8.
2. Remove the manifolds and disassemble the ball
check valves as explained on page 11.
3.
Overmolded Diaphragms
a. Orient the pump so one of the fluid covers faces
up. Use a 10 mm socket wrench to remove the
fluid cover screws (7), then pull the fluid cover
(3) up off the pump.
b. The exposed diaphragm (15) will screw off by
hand from the diaphragm shaft (104). The dia-
phragm shaft bolt will remain attached to the
diaphragm. Remove the air side diaphragm
plate (14).
c. Turn the pump over and remove the other fluid
cover. Pull the diaphragm and shaft up through
the center housing.
d. Grasp the diaphragm firmly and use a wrench
on the flats of the shaft to remove. Also remove
the air side diaphragm plate (14). Continue with
Step 5.
4.
All Other Diaphragms
a. Orient the pump so one of the fluid covers faces
up. Use a 10 mm socket wrench to remove the
fluid cover screws (7), then pull the fluid cover
up off the pump. Turn the pump over and
remove the other fluid cover.
b.
Plastic Pumps:
Use a 1-1/4 socket or box end
wrench on the hex of a fluid side diaphragm
plate to remove. Then remove all parts of the
diaphragm assembly. See F
Metal Pumps:
Remove the bolt (304) from one
side of the diaphragm shaft, then remove all
parts of that diaphragm assembly. See F
. 7.
c. Follow the same procedure to disassemble the
other diaphragm assembly.
5. Inspect the diaphragm shaft (104) for wear or
scratches. If it is damaged, inspect the bearings
(105) in place. If they are damaged, use a bearing
puller to remove them.
NOTE: Do not remove undamaged bearings.
6. Use an o-ring pick to remove the u-cup packings
(106) from the center housing. Bearings (105) can
remain in place.
7. Use a socket wrench to remove the pilot valves
(101).
8. Remove the pilot valve cartridges only if necessary
due to a known or suspected problem.
After remov-
ing pilot valves,
use a hex to remove the cartridges
(102), then remove o-rings (103). If stripped, use
two screwdrivers to screw out the cartridge.
NOTE: Do not remove undamaged pilot valve
cartridges.
