Specifications

ITEM DESCRIPTION
1 Drain Valve
2
Sump
3 Cap Nut
4 Cap Nut Gasket
5 Filter Element
6 Filter Housing
Figure 7-2. Air Filter
I.
8.
Open supply air shutoff valve and check for
leaks.
Return system to service.
8.
e. Diaphragm and Calibration Spring. Use the
following procedure for replacement of the
receiver diaphragm and replacement of the
calibration spring. If replacing the diaphragm
only, skip steps 7 and 12. If replacing calibration
spring only skip steps 8 through 11.
1.
2.
3.
4.
5.
6.
I.
9.
Remove power positioner from service.
Disconnect signal connector (3, Figure 7-3)
from elbow (2) and remove elbow.
Remove bolts (1) securing diaphragm cover
(4) to diaphragm housing (11).
Remove zero balance spring (5) from top of
thrust plate (6).
Carefully hold upper end of pilot valve stem
(17) with a 506 inch open end wrench. Free
spring connecting link (10) from pilot valve
stem by turning lower connecting link ball
socket nut counterclockwise.
Remove thrust plate (6), diaphragm (7) and
connecting link (10) from the diaphragm
housing (11).
Remove calibration spring (14) through tip
-
of diaphragm housing (11).
Remove connecting link (10) from
diapbmgm (7) by turning upper ball socket
nut counterclockwise.
I
Disassemble diaphragm assembly by
removing nut (9) from thrust plate (6).
Separate diaphragm (7), diaphragm seat (8)
and thrust plate.