Honeywell HON 670 Component Documentation, Maintenance Manual And Spare Parts page 23

Replacing the wear parts
of the double diaphragm
system
HON 670 / HON 671 Controllers Component Documentation
Proceed as follows:
Figure Step Description
1 Replace the O-ring (1) of the cap nut with a
new, lubricated O-ring.
Note: See the appendix for the lubricants
to be used.
2 Take out the piston (1).
3 Remove the following parts:
▪ Diaphragm plate (1)
▪ Diaphragm (2)
4 Screw the assembly aid (1) into the internal
thread of the nozzle (2).
5 Hold the connecting piece in place (1) and
pull the nozzle (2) out.
Maintenance
23