VERDER VERDERAIR VA 40 Instructions Manual page 20

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: PTFE models include a PTFE diaphragm (403) in
addition to the backup diaphragm (401).
5. 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 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.
20 819.4486
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*), PTFE diaphragms (403*, if present),
and outer diaphragm plates (105) exactly as shown in
Fig. 13. These parts must be assembled correctly.
4. Apply medium-strength (blue) loctiteR or equivalent 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 18.1–22.6 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 14.7–16.9 N.m, using a 13 mm socket wrench.
Then torque the shorter screws (107).
7. Reassemble the ball check valves and manifolds as ex-
plained on page 18.