Graco 311595C, Instructions - Parts Manual

Page: 4 / 10

Repair
4 311595C
Repair
Back Pressure Regulator Repair
1. Relieve all system fluid pressure.
2. Shut off air to the back pressure regulator.
3. See F
IG
. 2. Unscrew the diaphragm housing (2)
from the back pressure regulator (1).
4. See F
IG
. 3. Remove the screws (111) and adapter
(110) from the back pressure regulator housing.
5. Inspect the valve seat (103). If damaged, remove
the seat and gasket (102). Install a new gasket
(102) and torque the new seat to 15-20 ft-lb (21-27
N•m).
6. See F
IG
. 3. Install the diaphragm assembly.
7. Install the adapter (110) and screws (111). Torque
the screws to 120-130 in-lb (13.6-14.7 N•m) oppo-
sitely and in sequence, three times.
8. Apply thread lubricant to the adapter (110). Screw
the diaphragm housing (2) onto the adapter. Return
the back pressure regulator to operation.
F
IG
. 2. Separate Diaphragm Housing from Back
Pressure Regulator
ti8554a
1
2
5
6
5
6
Apply thread lubricant.
5
5
F
IG
. 3. Back Pressure Regulator Repair
ti8555a
101
102
103
107
110
111
112
113
Torque to 15-20 ft-lb (21-27 N•m).
Torque to 120-130 in-lb (13.6-14.7 N•m) oppositely and in
sequence, three times.
Apply thread lubricant.
2
3
5
2
5
3
104