Pressure Control - Graco ULTRA 500 231-032 Instructions-Parts List Manual

WARNING
To reduce the risk of serious injury,
follow the illustrated Pressure Relief
Procedure warning on page 24 when-
ever you are instructed to relieve pres-
sure.
NOTE: Read the GENERAL
INFORMATION on page 24 before
doing this procedure.
NOTE: Refer to Fig 29–1 for this procedure.
1. Relieve pressure.
2. Disconnect the fluid outlet hoses. Discon-
nect the hose (68) between the pump and

pressure control.

3. Loosen the filter bracket nut (37).
4. Hold the hex of the pressure control
adapter (341) firmly with a 3/4" open end
wrench. Use an adjustable wrench to un-
screw the swivel union (38 or 5), and then
remove the fluid filter (67).
5. Remove the pressure control cover (62).
Disconnect the four motor leads. See Fig
28–2.
6. Remove the circuit board and retain it.
See page 28.
7. Remove the conduit (1).
8. Remove the three pressure control
mounting screws (7), lockwashers (9)
and nuts (10). Remove the pressure con-
trol.
9. Remove the screws (20) and back
mounting bracket (64).
CAUTION
Do not allow the adapter (341) to turn while
installing the new
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 (38 or 5).
10. Install the new pressure control assembly
in the reverse order of disassembly. Rein-
stall the conduit seal (26) around the
wires in the conduit connector (345) to
prevent motor contamination from enter-
ing the control. See the DETAIL below.
11. Perform the PRESSURE CONTROL
ADJUSTMENT, page 30, before regular
operation of the sprayer.
PRESSURE CONTROL REPLACEMENT
UPRIGHT CART
REPAIR
LO-BOY CART
pressure control
Fig 29–1
37
11
CAUTION
Do not allow the adapter
(341) to turn at any time.
37
11
9
10
20
64
7
35,62
345
1
341
344
68
38
67
26
345
9
10
20
64
7
35,62
345
1
341
344
68
5
67
29
307–758