Honeywell HON 512 User And Maintenance Manual page 86

Maintaining the
actuator assembly
HON 512 with HON 650 pilot user manual
Proceed as follows:
Figure Step Description
1 Unscrew the inlet body's screws (1). Lift
the inlet body off. Use suitable hoisting
equipment and slings for this purpose.
2 Loosen the screws (1) on the tension ring
on the inlet body and lift off the tension
ring (2).
3 Remove the diaphragm unit.
4 Remove the compression springs.
5 Remove the two support rings (1). Replace
the O-ring (2) with a new, greased O-ring
and insert the support ring back in place.
6 Check the guide ring (3) for damage.
Replace it if necessary. Fill the chamber
with grease for valve sleeves (as per the
lubricant table) via the guide ring.
Maintenance
86