Repair
311595C
5
Diaphragm Repair
1.
Relieve all system fluid pressure.
2.
Shut off air to the back pressure regulator. Discon-
nect the air supply line from the inlet fitting (216).
3.
See F
. 4. Remove the screws (209) and cover
(203). Remove the diaphragm (204).
4.
Lift the piston rod assembly out of the housing
(201). Inspect the piston rod (210) for damage. Dis-
assemble the piston and replace parts as needed.
5.
To reassemble the piston, apply thread sealant and
torque the screw (211) to 75-80 in-lb (8.5-9.0 N•m).
Lubricate the rod (210) and reinstall in the housing
(201).
6.
Install the new diaphragm (204).
7.
Install the cover (203) and screws (209). Torque the
screws to 170-190 in-lb (19-21 N•m) in alternating
pattern. Return the back pressure regulator to oper-
ation.
F
IG
. 4. Diaphragm Repair
ti8556a
201
202
203
204
209
210
211
216
Apply thread sealant and torque to 75-80 in-lb (8.5-9.0 N•m).
Torque to 170-190 in-lb (19-21 N•m) in alternating pattern.
Lubricate.
1
2
3
2
1
3
