859.0089
15
7. To ensure proper seating and extend diaphragm life,
attach the second fluid cover with air pressure on the
pump.
a. See F
. 8. Place the supplied tool (302) where
the air valve gasket (108) normally goes. Arrows
(A) must face toward the fluid cover that is
already attached.
b. Reattach the air valve.
c. Supply a minimum of 20 psi (0.14 MPa, 1.4 bar)
air pressure to the air valve. Shop air may be
used. The diaphragm will shift so the second fluid
cover will seat properly. Keep air pressure on
until the second fluid cover is attached.
d. Attach the second fluid cover (3). See
Torque
Instructions,
page 15.
e. Remove the air valve and the tool (302), replace
the gasket (108), and reattach the air valve. See
Torque Instructions,
page 15.
NOTE:
If you are replacing the diaphragms but not the air
valve, you must remove the air valve and gasket, put the
tool in place of the gasket, and put the air valve back on
to get the air pressure needed for proper installation of
the second fluid cover. Remember to remove the tool and
replace the gasket when finished.
8. Reassemble the ball check valves and manifolds as
explained on page 11.
Torque Instructions
NOTE:
Fluid cover and manifold fasteners have a
thread-locking adhesive patch applied to the threads. If
this patch is excessively worn, the screws may loosen
during operation. Replace screws with new ones, or
apply medium-strength (blue) Loctite or equivalent to the
threads.
If fluid cover or manifold fasteners have been loosened, it
is important to torque them using the following procedure
to improve sealing.
NOTE:
Always completely torque fluid covers before
torquing manifolds.
Start all fluid cover screws a few turns. Then turn down
each screw just until head contacts cover. Then turn
each screw by 1/2 turn or less working in a crisscross
pattern to specified torque. Repeat for manifolds.
Fluid cover and manifold fasteners:
100 in-lb (11.3 N•m)
Retorque the air valve fasteners (V) in a crisscross pat-
tern to specified torque.
Plastic center sections:
55 in-lb (6.2 N•m)
Metal center sections:
80 in-lb (9.0 N•m)
F
IG
. 8. Fluid cover tool
302
A
ti14120a
F
IG
. 9. Torque sequence
9
ti18448a
ti18449a
