Honeywell HON 512, User And Maintenance Manual

Page: 105 / 208

Maintenance
HON 512 with HON 650 pilot user manual 105
Figure Step Description
8 Replace the O-ring (1) with a new, greased
O-ring.
9 Take the spindle. Replace the O-ring (1)
and the retaining ring (2) with new,
greased ones.
10 Lubricate the thread surfaces.
Slide the spindle into the sleeve and screw
in the spindle all the way to the position
shown. The notch on the spindle should be
flush with the sleeve’s front edge.
11 Lubricate the thread surfaces.
Screw the amplifying valve into the base
plate and put the cap back in place.
Depending on the specific pilot model, proceed as indicated in the relevant
section:
Maintaining the control stage with a diaphragm assembly (see page 106)
Maintaining the control stage with a larger diaphragm assembly (see page 114)
Maintaining the control stage with a metal bellows assembly (see page 125)
Next task