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Repair
Reassemble the Diaphragm and Center Section
Follow all notes in the illustration. These notes
contain important information.
NOTE: Apply lithium-based grease whenever
instructed to grease.
1. Clean all parts and inspect for wear or damage.
Replace parts as needed.
2. If removed, grease and install the new pilot valve
cartridges (109), cartridge o-rings (110), and
retaining rings (113).
NOTE: Cartridges (109)
pilot valves (111).
3. Grease and install the pilot valves (111). Torque
to 2-3 N•m (20-25 in.-lb), at 110 rpm. Do not
over-torque.
4. Grease and install the diaphragm shaft u-cup
packings (106) so the lips face out of the housing.
5. If removed, insert the new bearings (107) into
the center housing. Use a press or a block and
rubber mallet to press-fit the bearing so it is flat
with the surface of the center housing.
6. Overmolded Diaphragms (TO)
a. Clamp the shaft flats in a vise.
b. If diaphragm setscrew comes loose or is
replaced, apply permanent (red) thread
locker to diaphragm side threads. Screw into
diaphragm until tight.
c. Assemble the air side plate (11) and washer
(17) onto the diaphragm. The rounded side
of the plate must face the diaphragm.
d. Apply primer and medium-strength (blue)
thread locker to the threads of the diaphragm
assembly. Screw the assembly into the shaft
as tight as possible by hand.
16
must
be installed before
e. Grease the shaft u-cups (106*) and the
length and ends of the diaphragm shaft
(108*). Slide the shaft into the housing.
f.
Reattach one fluid cover (3). Arrow (A)
must point toward the air valve. See
Torque Instructions, page
g. Repeat Steps b-d for the other diaphragm
assembly and install on the exposed end of
the shaft.
h. Tighten by hand as tight as possible. Go to
Step 8.
7. All Other Diaphragms
a. Assemble the diaphragm (12), the backup
diaphragm (13, if present), the air side
diaphragm plate (11), and the washer (17)
on the fluid side plate (10) exactly as shown.
b. Apply primer and medium-strength (blue)
thread locker to the threads of the screw on
the fluid side plate. Screw the assembly into
the shaft hand-tight.
c. Grease the shaft u-cups (106*) and the
length and ends of the diaphragm shaft
(108*). Slide the shaft into the housing.
d. Repeat for the other diaphragm assembly
and install on the exposed end of the shaft.
e. Hold one of the plates with a wrench, and
torque the other plate to 100-105 ft-lb
(136–142 N•m) at 100 rpm maximum. Do not
over-torque.
f.
Reattach one fluid cover (3). Arrow (A)
must point toward the air valve. See
Torque Instructions, page
19.
19.
859.0302
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