Diaphragm Assembly Removal; Diaphragm Assembly Replacement - ABB AV1 Operating Instructions Manual

REPAIR AND REPLACEMENT
Tools Required:
REPLACEMENT PROCEDURES
8 - 6

DIAPHRAGM ASSEMBLY REMOVAL

Allen wrench.
•
Adjustable wrench.
•
1. Transfer the positioner from automatic to manual operation
(Section 5).
2. Using an Allen wrench, remove the four diaphragm cover screws
(Item 45) and remove the diaphragm cover.
3. Remove the diaphragm support screw (Item 53) and washer
(Item 54).
NOTE: When removing the diaphragm support screw, do not
allow the diaphragm support (Item 23) to rotate.
NOTE: Item 53 is replaced by SEM screw NBMHA13006A as of
November 23, 2009/Serial Number 3K620000029936 & Item 54
is no longer used.
4. Remove the diaphragm support (Item 23).
5. Carefully remove the large diaphragm (Item 73) from assembly.
6. Remove the diaphragm spacer (Item 22).
7. Remove the diaphragm ring (Item 24).
8. Carefully remove the small diaphragm.

DIAPHRAGM ASSEMBLY REPLACEMENT

1. Place the small diaphragm (Item 20) in the diaphragm housing
with the concave side facing up. Check for correct alignment of
the tabs relative to the diaphragm housing.
2. Place the diaphragm ring (Item 24) over the small diaphragm
(Item 20). Make sure the alignment pins on the diaphragm ring prop-
erly engage the other mating parts.
3. Set the diaphragm spacer in place (Item 22).
4. Place the large diaphragm (Item 73) in place with the convex side
up. Check for correct alignment of the tabs relative to the diaphragm
housing.
5. Place the diaphragm support (Item 23) on the large diaphragm.