Gain Hinge Spring; Pilot Valve Body - ABB AV3 Instruction Manual

REPAIR/REPLACEMENT PROCEDURES

GAIN HINGE SPRING

Tools required

PILOT VALVE BODY

Tool required
GAIN HINGE SPRING
8 - 4
(Item numbers reference Figures
Flat-tip screwdriver
⁄
-inch Allen wrench
9
64
1. Transfer the positioner from automatic to manual operation (refer
to Section 5).
2. Remove positioner cover by removing two cover screws.
3. Remove plug (item 29) from positioner housing. (Access to the
hinge screws is provided through this opening.)
4. Remove four gain hinge spring screws (item 42) while holding the
beam assembly steady (item 6).
5. Remove gain hinge spring.
6. Insert new hinge spring.
NOTE: When installing the hinge spring, be sure it properly seats
(flush) between the steps. If the hinge spring hangs up, remove and
rotate hinge 90°. Recheck for proper seating.
7. Insert and torque hinge screws to 2.6, ±0.2 Nm (23, ±2 in-lbs)
while holding the beam assembly steady (item 6).
8. Transfer the positioner back to automatic operation (refer to
Section 5).
9. Perform the procedure outlined in
ADJUSTMENT.
(Item numbers reference Figure
Flat-tip screwdriver
1. Transfer the positioner from automatic to manual operation (refer
to Section 5).
2. Remove positioner cover by removing two cover screws.
3. Carefully, unhook ends of valve clip (item 5). Remove clip from
valve body. Remove valve stem (item 3) from lower end of valve
body.
4. Remove two pilot valve screws (item 52) securing valve body and
lift valve body off housing.
9-1 through 9-6.)
PILOT VALVE STROKE
9-1 through 9-6.)