Graco ULTRA 1000 Instructions-Parts List Manual page 26

PRESSURE CONTROL REPLACEMENT
(Refer to Fig
2 0 1
WARMING
Relief Procedure Warning on page 13 to reduce
Before doing this procedure, follow the Pressure
the risk of a fluid injection injury, injury from mov-
1. Disconnect the main fluid hose
(901
and the secon-
dary fluid hose, if used, from the sprayer.
2. Disconnect the fluid hose (471 from between the
displacement pump outlet nipple
(461
and pressure
control inlet nipple
(3441.
3. Loosen
the filter bracket nut 128) and washer (13)
using a 314" open end wrench.
4. Hold the pressure control adapter (3411 firmly with
a
314"
open end wrench. Use an adjustable wrench
filter
(481.
to loosen the swivel union
18).
then remove the fluid
5. Remove the pressure control cover and screws
(8,
151, and disconnect the four motor leads st the ep-
propriate terminals.
6. Refer to Clrcult Board Replacement on page
2 2 ,
remove the circuit board and retain.
7. Remove the conduit
(22).
8. Use a 112" open end wrench to loosen and remove
the pressure control mounting screws
( 4 4 1
located
below the pressure control box. Remove the box.
9. Install the new pressure control assembly in the
reverse order of disassembly. Be sure to reinstall
the conduit seal (&not shown) around the wires in
the conduit connector
(3451
to prevent motor con-
tamination from entering the control box.
CAUTION
stslling the new pressure control assembly. Turn-
ing
it
can damage the sensitive bourdon tube.
Hold the adapter firmly with a 314" open end
10. Periorm"the pressure control calibration'procedure
on page 27, before regular operation of the sprayer.
26 307-785