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Service
4.
Loosen but do not remove the diaphragm shaft
bolts (107), using a 15 mm socket wrench (1 in. on stain-
less steel models) on both bolts.
5.
Unscrew one bolt from the diaphragm shaft (24) and
remove the o-ring (108), fluid side diaphragm plate (105),
PTFE diaphragm (403, used on PTFE models only), dia-
phragm (401), and air side diaphragm plate (104). See
Fig. 12.
6.
Pull the other diaphragm assembly and the diaphragm
shaft (24) out of the center housing (1). Hold the shaft
flats with a 19 mm socket wrench, and remove the
bolt (107) from the shaft. Disassemble the remaining
diaphragm assembly.
7.
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 20.
8.
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.
9.
Clean all parts and inspect for wear or damage. Replace
parts as needed.
Reassembly
1.
Install the shaft u-cup packings (402*) so the lips face
out of the housing (1). Lubricate the packings. See
Fig. 12.
2.
Install the diaphragm assembly on one end of the
shaft (24) as follows:
a.
Install the o-ring (108*) on the shaft bolt (107).
18 829.4334
b.
Install the fluid side diaphragm plate (105) on the
bolt so the rounded side faces in, toward the dia-
phragm (401).
c.
On PTFE models only, install the PTFE dia-
phragm (403*). Make certain the side marked AIR
SIDE faces the center housing (1).
d.
Install the diaphragm (401*) on the bolt. Make
certain the side marked AIR SIDE faces the center
housing (1).
e.
Install the air side diaphragm plate (104) so the
recessed side faces the diaphragm (401).
f.
Apply medium-strength LoctiteR or equivalent to the
bolt (107) threads. Screw the bolt (107) into the
shaft (24) handtight.
3.
Grease the length and ends of the diaphragm shaft (24),
and slide it through the housing (1).
4.
Assemble the other diaphragm assembly to the shaft as
explained in step 2.
5.
Hold one shaft bolt (107) with a wrench and torque the
other bolt to 27–34 NSm at 100 rpm maximum.
6.
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 (106
and 112), handtight. Install the longer screws (112) in the
bottom holes of the covers. See Fig. 11. Using a 13 mm
socket wrench, torque the screws oppositely and evenly
to 22–25 NSm.
7.
Reassemble the ball check valves and manifolds as
explained on page 16.
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