Graco 238890 - Page 14

Service
14 308647T
6. Remove the o-ring (17) from the groove in the base
housing (4), clean and inspect the base housing,
and replace if necessary.
7. Install a new o-ring (17) in the groove in the base
housing (4).
8. Lightly lubricate the backing plate (8) bore and
plunger (7) with a lithium-based grease.
9. Install the new, pre-assembled diaphragm
subassembly into the backing plate (8).
NOTE: The diaphragms will have a bow in them
before you install them.
10. Align the holes in the diaphragms with the backing
plate (8).
11. Install the backing plate/diaphragms assembly over
the base housing (4). Hold the backing plate (8)
tightly against the base housing, and install the four
base housing screws (9).
12. Torque the base housing screws (9) first to 20 to 25
ft-lb (27 to 34 N•m), then to 30 to 35 ft-lb (41 to 48
N•m) in the sequence shown in Fig. 3.
FIG. 3

4
1
2
 3
10
2
17
4
3
5
9
backing
plate (8)
diaphragm
and valve
actuator
assembly
cartridge
assembly
Torque Sequence for Regulator
Base Housing Screws (9)
06656