Pressure Control Replacement - Graco Ultra 1000 Instructions-Parts List Manual

Pressure Control
WARNING
Before doing this procedure, follow the Pressure
Relief Procedure Warning on page 21 to reduce
Refer to Fig. 24.
1.
Disconnect the
main fluid hose (23) and the
sec-
ondary fluid hose, if used, from the sprayer.
2. Disconnect the fluid hose (47) from between the
displacement pump outlet nipple (46) and pres-
sure control inlet elbow (34).
3. Hold the hex of the pressure Control adapter (A)
firmly with an open end wrench. Use a wrench to
unscrew the fitting
(8)
and filter.
4, Remove the pressure control cover
and
screws,
and disconnect the four motor leads at the appro-
priate terminals.
5.
Refer to Circuit Board Replacement on page 26,
and remove the circuit board and retain.
6. Remove the conduit (22).
7. Remove the
three
pressure control mounting
screws (37) and lockwashers (40) and nuts (41)
located below the pressure control box. Remwe
the box. Remove the mounting plate (16) and in-
s t a l l i t on the new pressure control.
6. Install the new pressure control assembly in the
reverse order
of
disassembly. Reinstall the con-
duit seal (5) around the wires in the conduit con-
nector (346) to prevent motor contamination from
entering the pressure control. See the Detail be-
low.
9. Perform the Pressure Control Adjustment, page
28, before regular operation
of the sprayer.
CAUTION
the new pressure control assembly. Turning it can
Do not allow the adapter (A) to turn while installing
damage the sensitive bourdon tube. Hold the
adapter firmly with a 19 mm open end wrench
while screwing in the fitting
(8).
-
S h m .
position
of
1
mnduii seal (5) in
mnduit connector ( 3 4 6 )