Specifications

10. Assemble new diaphragm (7) with
diaphragm seat (8) and thrust plate (6).
Secure in place with nut (9).
11. Screw connecting link (10) upper ball socket
nut into thrust plate (6) stud.
12. Ensure spring washer (15) is in bottom of
spring nut cup (16) and install new
calibration spring (14).
13. Place diaphragm assembly and connecting
link in diaphragm housing so connecting link
(10) is aligned with pilot valve stem (17).
14. Align the Edges of diaphragm (3 with the
diaphragm housing (11) to make an air tight seal.
15. Place zero balance spring (5) over thrust
plate (6).
16. Making sure the diaphragm (7) is not folded
or pinched, replace diaphragm cover (4) and
align sealing edge of diaphragm cover on
top edge of diaphragm.
17. Secure diaphragm cover (4) with bolts (1).
Tighten all bolts hand tight. Tighten bolts
down making sure that all are tightened
WS”lY.
18. Connect connecting link (10) to pilot valve
stem (17) with lower link ball socket nut.
19. Reinstall elbow (2) and signal connector (3).
20. Test for air leakage around diaphragm cover
(4) and diaphragm housing (11). Use a leak
detector such as “Snoop”, and send an air
signal to power positioner. If leak is
detected, repair as necessary.
21. Refer to Section IV and calibrate power
positioner.
22. Return power positioner to service
d. Air Lock Diaphragm. Use the following
procedure for replacement of the air lock
diaphragm.
1. Remove power positioner from service
2. Disconnect connector (18, Figure 7-4) from
tee (20).
3. Loosen nut (2) and remove screw (4) and
washer (3) from spring nut (1).
4. Hold exhaust blocking valve link (9, Figure
6-5) with a screwdriver and remove nut (38,
Figure 7-4). Remove. exhaust valve link.
5. Remove air lock stop bolt (43), washer (42)
and nut (25).
6. Remove screw (24) securing shaft bearing
(23) to bottom end of worm shaft (48).
7. Remove screws (41) securing clapper lever
(40) from couplings (32).
8. Swing clapper lever (40) out of the way
9. Remove screws (34) securing diaphragm
plate (33) to diaphragm chamber (22) and
remove diaphragm plate.
10. Pulling on coupling (32), remove diaphragm
assembly from diaphragm chamber (22).
11. Remove coupling (32) from diaphragm stud
(29). Separate diaphragm stud, diaphragm
(30) and shield (31).
12. Assemble new diaphragm (30) with stud
(29) and shield (31). Secure together with
coupling (32).
13. Place diaphragm assembly in diaphragm
chamber (22) and
_ - -
(33).
install diauhragm plate
I
14. Swing clapper lever (40) over diaphragm
and install screws (41) into couplings (32). !
15. Attach shaft bearing (23) to worm shaft (48)
with screw (24).
16. Install air lock stop bolt (43), washer (42)
and nut (25).
17. Install exhaust blocking valve link through
frame and clapper lever. Install nut (38) on
exhaust blocking valve link.