Honeywell HON 512 User And Maintenance Manual page 107

HON 512 with HON 650 pilot user manual
Figure Step Description
3 Unscrew the fitting (1) on the upper cover.
Replace the sealing ring (2) with a new,
greased sealing ring.
Lubricate the thread surfaces.
Screw the fitting (1) back in.
4 Remove the spring from the cap.
5 Unscrew the cap (1) while using an
open-end wrench to hold the
diaphragm plate (2) in place so as to
prevent the components from
turning.
Replace the O-ring (3) in the cap with a
new, greased O-ring.
6 Remove the pistons from the
connecting piece.
7 Remove the diaphragm disc (1) and the
diaphragm (2).
Maintenance
107