Graco 311595C Instructions - Parts Manual page 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
IG
(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.
311595C
1
Apply thread sealant and torque to 75-80 in-lb (8.5-9.0 N•m).
2
Torque to 170-190 in-lb (19-21 N•m) in alternating pattern.
3
Lubricate.
209
2
203
204
F . 4. Diaphragm Repair
IG
Repair
216
211
1
202
210
3
201
ti8556a
5