20 308479
Service
4. Loosen but do not remove the diaphragm shaft
bolts (107), using a 15 mm socket wrench (1” on
stainless 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),
R diaphragm (403, used on
R models only), diaphragm (401), and air
side diaphragm plate (104). See Fig. 14.
6. 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 bolt (107) from the shaft. Disas-
semble 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 22.
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 pack-
ings. See Fig. 14.
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).
b. Install the fluid side diaphragm plate (105) on
the bolt so the rounded side faces the dia-
phragm (401).
NOTE: On stainless steel pumps only, the fluid side
diaphragm plate (105) is stainless steel. This plate is
not stamped with its part number. Be sure to install
this plate on the fluid side of the diaphragm.
c. On R models only, install the R
diaphragm (403*). Make certain the side
marked AIR SIDE faces the center hous-
ing (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 rounded side faces the diaphragm (401).
This plate is used on all models, and is
stamped with its part number.
f. Apply medium-strength (blue) LoctiteR or
equivalent to the bolt (107) threads. Screw the
bolt into the shaft (24) hand tight.
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 20–25 ft-lb (27–34 N.m) 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). Apply medium-
strength (blue) LoctiteR or equivalent to the
threads of the screws (106). Secure the covers
with the screws handtight. See Fig. 13. Using a 10
mm socket wrench, torque the screws oppositely
and evenly to 120–150 in-lb (14–17 N.m).
7. Reassemble the ball check valves and manifolds
as explained on page 18.
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