Service
3A4238B
23
Reassembly
1.
Install the shaft u-cup packings (402*) so the lips
face
out
of the housing (1). Lubricate the packings.
2.
Assemble the air side plate (104) onto the
diaphragm (403). The wide, radiused side of the
plate must face the diaphragm. Apply
medium-strength (blue) thread locker to the threads
of the diaphragm assembly. Screw the assembly
into the shaft (24) hand tight.
3.
Grease the length and ends of the diaphragm shaft
(24). Insert the shaft/diaphragm assembly into one
side of the pump. Assemble the fluid cover (101)
and clamp (106) so the arrow (A) on the cover faces
the same direction as the air valve (B). Securely
tighten the clamp.
4.
Assemble the other diaphragm assembly to the
shaft as explained in step 2. This diaphragm will be
lifted off the air cover at this point.
5.
Supply the pump with low pressure air (less than 7
psi [0.05 MPa, 0.5 bar]). The diaphragm will very
slowly pull onto the air cover (23). Find the pressure
that keeps the diaphragm close enough to clamp,
but does not let it contact the pilot pin.
6.
Assemble the fluid cover (101) and clamp (106) so
the arrow (A) on the cover faces the same direction
as the air valve (B). Securely tighten the clamp.
NOTE:
If the diaphragm contacts the pilot pin and is
forced away from the air cover, try step 5 again. If
necessary, return to step 3.
7.
Reassemble the ball check valves and manifolds as
explained on page 18.
To reduce the risk of serious injury, including
amputation, do not put your fingers or hand
between the air cover and the diaphragm.
NOTICE
Do not deform the diaphragm manually. The
diaphragm needs uniform pressure to deform properly
for maximum life.
F
IG
. 13
ti10631a
106
24
104
403*
101
23
1
Apply medium strength (blue) thread locker
to bolt (not shown).
5
5
B
A
