16
859.0089
7.
To ensure proper seating and extend diaphragm
life, attach the second fluid cover with air pressure
on the pump.
a.
. 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 16.
e.
Remove the air valve and the tool (302), replace
the gasket (108), and reattach the air valve. See
Torque Instructions, page 16.
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 12.
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 proce-
dure 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:
90 in-lb (10.2 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
Summary of Contents for VERDERAIR VA 25
Page 33: ...859 0089 33 Notes ...
