Pressure Control Replacement - Graco A Series Instructions-Parts List Manual

WARNING
Before doing this procedure, follow the
Relief Procedure W arning on page 24 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts, or
electric shock. Unplug the sprayer!
Refer to Fig 29–1.
1. Disconnect the main fluid outlet hose and the secon-
dary fluid hose, if used. Disconnect the fluid hose
(30) between the adapter (31) and the nipple (344).
2. Loosen the nut (69) which holds the threaded end of
the adapter (55) to the pressure control mounting
bracket (7).
3. Hold the hex of the pressure control adapter (341)
firmly with a 3/4" open end wrench. Use an adjust-
able wrench to unscrew the swivel union (12), and
then remove the fluid filter assembly (10).
4. Remove the pressure control cover and screws. Dis-
connect the four motor leads at the appropriate ter-
minals. See Fig 28–2.
5. Refer to CIRCUIT BOARD REPLACEMENT
page 28, remove the circuit board and retain.
30
31
Fig 29–1

PRESSURE CONTROL REPLACEMENT

Pressure
on
45
44
70
69
6. Remove the conduit (21).
7. Remove the screws (27), lockwashers (44) and nuts
(45) located below the pressure control.
8. Remove the screws (8) holding the back mounting
bracket (7) to the pressure control.
9. Remove items 306 to 345 from the pressure control
and reinstall them in the new pressure control.
10. Install the new pressure control assembly in the re-
verse order of disassembly. Be sure to reinstall the
conduit seal (78) around the wires in the conduit con-
nector (345) to prevent motor contamination from
entering the pressure control.
PRESSURE CONTROL ADJUST-
11. Perform the
MENT starting on page 30, before regular operation
of the sprayer.
CAUTION
Do not allow the adapter (341) to turn while installing
the new pressure control assembly . Turning it can
damage the sensitive bourdon tube. Hold the
adapter firmly with a 3/4" open end wrench while
screwing in the swivel union (12).
12
43
DETAIL
Shows position of con-
duit seal (78) in conduit
connector (345)
78
345
8
21
344
345,78
27
341
307–958