Graco 390 253958, Important Safety Instructions Manual

Page: 23 / 32

Pressure Control Assembly Replacement
311737B 23
Pressure Control Assembly Replacement
See Wiring Diagram, page 28.
Removal
1. Relieve pressure , page 8. Disconnect power cord
from outlet.
2. Remove two screws (30) and shroud (29) (see illus-
tration, page 17).
3. Disconnect pressure switch connector (A) from con-
trol board (33).
4. Remove tape (22) holding wires to manifold.
5. Pull wires back through hole (K) in housing.
6. Turn the pressure control knob (16) counter clock-
wise as far as you can to access the flats on either
side of the pressure control assembly.
7. Using a 1 in. (26 mm) wrench loosen and unscrew
pressure control assembly.
8. Remove pressure control assembly.
Installation
1. Align grommet collar (17) on fluid manifold so open-
ing faces toward motor.
2. Apply Loctite
®
to pressure control assembly threads
(16)
3. Screw pressure control assembly (16) into manifold
and torque to 150 in-lbs (17.0 N.m)
4. Wrap wires around knob and feed through slot in
grommet (21).
5. Insert grommet (21) in hole (K) in housing. Secure
wires to manifold housing with tape (22).
6. Reconnect pressure switch connector (A) to control
board (33).
7. Install shroud (29) and two screws (30) (see illustra-
tion, page 15).
16
17
21
22
A
K
ti5768d
If you plan to reuse the pressure control assembly,
be very careful not to damage or tangle the wires
while unscrewing the assembly.
ti5766a
Inspect pressure control assembly before installa-
tion to verify the o-ring is installed and in place.
Be careful when tightening pressure control knob
that wires do not get pinched between the pressure
control assembly and fluid manifold.