User's Manual

Repair
Reassemble the Diaphragm and Center Section
Follow all notes in the illustration. These notes
contain important information.
NOTE: Apply li
thium-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)
must be installed before
pilot valves (111).
3. Grease and install the pilot valves (111). Torque
to 20-25 in.-lb (2-3 N•m), 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 (PO)
a. Clamp th
eshaftflatsinavise.
b. If diap
hragm setscrew comes loose or is
replac
ed, apply permanent (red) thread
locker
to diaphragm side threads. Screw into
diaphr
agm until tight.
c. Assem
ble the air side plate (11) and washer
(17) o
nto the diaphragm. The rounded side
of the
plate must face the diaphragm.
d. Apply
primer and medium-strength (blue)
threa
d locker to the threads of the diaphragm
asse
mbly. Screw the assembly into the shaft
as ti
ght as possible by hand.
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 19.
g. Repeat Steps b-d for the other diaphragm
assembly and install on the exposed end of
the shaft.
h. Tighten by hand as much as possible. Go
to Step 8.
7. All Other Diaphragms
a. Assemble t
he diaphragm (12), the backup
diaphragm
(13, if present), the air side
diaphragm
plate (11), and the washer (17)
on the flui
d side plate (10) exactly as shown.
b. Apply pri
mer and medium-strength (blue)
thread lo
cker to the threads of the screw on
thefluids
ide plate. Screw the assembly into
the shaf
t hand-tight.
c. Grease t
he shaft u-cups (106*) and the
length a
nd ends of the diaphragm shaft
(108*).
Slide the shaft into the housing.
d. Repeat
for the other diaphragm assembly
and ins
tall on the exposed end of the shaft.
e. Hold on
e 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. Reatt
ach one fluid cover (3). Arrow (A)
must p
oint toward the air valve. See
Torqu
e Instructions, page 19.
16 3A2714B