VERDER VERDERAIR VA 40 Instructions And Parts List page 21

Service
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
.
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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.
Reassembly - Standard Diaphragms
1. Grease the shaft u-cup packings (402*) and install
them so the lips face out of the housing (1). See F
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),
diaphragms (401*), PTFE diaphragms (403*, if
present), and outer diaphragm plates (105) exactly
as shown in F . 13. These parts must be
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assembled correctly.
4. Apply medium-strength (blue) loctite® 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 F . 12.
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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). See
Torque Sequence, page 30.
7. Reassemble the ball check valves and manifolds as
explained on page
19
Reassembly - Overmolded Diaphragms
Warning
To reduce the risk of serious injury, including
amutation, do not put your fingers or hand between
the air cover and the diaphragm.
.
Grease
1. the shaft u–cup packings (402*) so the lips
face out of the housing (1). See
2. Assemble the air side plate (104) onto the diaphragm
(403). The wide, radiused side of the plate must face
the diaphragm. Apply medium–strength (blue) Loctite
or equivalent to the threads of the diaphragm
assembly. Screw the assembly into the shaft (24)
hand–tight.
3. Grease the length and ends of the diaphragm shaft
(24). Insert the shaft/diaphragm assembly into one side
of the pump. Align the fluid cover (101) and the center
housing so the arrow (A) faces the same direction as
the air valve (B). Secure the cover with the screws (107
and 108), handtight.
.
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4. Torque the longer screws (108) oppositely and evenly
14.7-16.9
to N•m, using a 13mm socket wrench. Then
torque the shorter screws (107).
Sequence, page 30.
5. Assemble the other diaphragm assembly to the shaft
as explained in step 2. This diaphragm will be lifted off
the air cover at this point.
6. Supply the pump with low pressure air (less than 0.5
bar [0.05 MPa, 7 psi]). The diaphragm will very slowly
pull onto the air cover. Find the pressure that keeps the
diaphragm close enough to secure with the screws, but
does not let it contact the pilot pin.
NOTE: Do not deform the diaphragm manually. The
diaphragm needs uniform pressure to deform properly for
maximum life.
7. Align the fluid cover (101) and the center housing (1) so
the arrow (A) faces the same direction as the air valve.
Secure the cover with two of the longer screws (108),
handtight.
NOTE: If the diaphragm contacts the pilot pin and is forced
away from the air cover, try Step 5 again. If necessary,
return to Step 3.
8. Torque the longer screws (108) oppositely and evenly
to 21–25 N•m (190–220 in–lb), using a 13mm socket
wrench. Then torque the shorter screws (107).
Torque Sequence, page 30.
9. Reassemble the ball check valves and manifolds as
explained on page
F . 13 .
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See Torque
.
19
819.4486
See
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