Graco 231–034 Instructions And Parts List page 29

Pressure Control Replacement
WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
NOTE: Refer to Fig. 20 for this procedure.
1. Relieve the pressure.
2. Disconnect the hose (70) at the pressure control.
3. Loosen the nut (38).
4. Hold the hex of the adapter (341) firmly with a
wrench. Use an adjustable wrench to unscrew the
swivel union (39). Remove the fluid filter (66).
5. Remove the screws (36) and cover (63). Discon-
nect the four motor leads. See Fig. 19.
6. Remove the circuit board and retain it. See page
28.
10
11
38
12
Fig. 20
7. Remove the conduit (1).
8. Remove the three screws (8), lockwashers (10)
and nuts (11). Remove the pressure control.
9. Remove the screws (22) and the bracket (64).
To avoid damage to the bourdon tube, do not allow
the adapter (341) to turn while installing the new
pressure control. Hold the adapter firmly with a
wrench while screwing in the swivel union (39).
10. Install the new pressure control in the reverse or-
der of disassembly. Install the seal (29) around the
wires in the elbow (345) of the pressure control.
The seal keeps the contaminants from entering the
conduit and the motor.
11. Perform the Pressure Control Adjustment, page
30, before regular operation of the sprayer.
22
64
341
344
70
39
CAUTION
8
75
36
33
345
1
29
345