Service
4. Unscrew
one outer plate (105) from the diaphragm
shaft (24). Remove one diaphragm (401), and the
inner plate (104). See Fig. 13.
NOTE:
T
eflon models include a T
eflon diaphragm (403)
in addition to the backup diaphragm (401).
5.
Pull the other diaphragm assembly and the dia
-
phragm shaft (24) out of the center housing (1).
Hold the shaft flats with a 19 mm socket wrench,
and remove the outer plate (105) from the shaft.
Disassemble the remaining diaphragm assembly
.
6.
Inspect the diaphragm shaft (24) for wear or
scratches. If it is damaged, inspect the bearings
(19) in place. If the bearings are damaged, refer to
page 22.
7.
Reach into the center housing (1) with an o-ring
pick and hook the u-cup packings (402), then pull
them out of the housing. This can be done with the
bearings (19) in place.
8.
Clean all parts and inspect for wear or damage.
Replace parts as needed.
Reassembly
1.
Grease the shaft u-cup packings (402*) and install
them so the lips face
out
of the housing (1). See
Fig. 13.
2.
Grease the length and ends of the diaphragm shaft
(24) and slide it through the housing (1).
3.
Assemble the inner diaphragm plates (104), dia
-
phragms (401*), T
eflon diaphragms (403*, if pres
-
ent), and outer diaphragm plates (105)
exactly
as
shown in Fig. 13. These parts
must
be assembled
correctly.
4.
Apply medium-strength (blue) Loctite
or equiva
-
lent to the threads of the fluid-side plates (105).
Hold one of the outer plates (105) with a wrench,
and torque the other outer plate to 160 to 200 in-lb
(18.1 to 22.6 N-m) at 100 rpm maximum. Do not
over-torque.
5.
Align the fluid covers (101) and the center housing
(1) so the arrows (A) on the covers face the same
direction as the air valve (B). Secure the covers
with the screws (107 and 108), handtight. Install
the longer screws (108) in the top and bottom
holes of the covers. See Fig. 12.
6.
First, torque the longer screws (108) oppositely
and evenly to 130–150 in–lb (15–17 N.m), using a
13 mm socket wrench. Then torque the shorter
screws (107).
7.
Reassemble the ball check valves and manifolds
as explained on page 18.
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