Control Board; Pressure Control; Pressure Adjust Potentiometer - Graco 309412F Repair Instructions

Removal
1.
Relieve pressure; page 4.
2. Fig.8. Remove four screws (54) and
display/cover (52). Pull display connector wings
(A) open on PC board and pull display connector
out.
3. Remove 2 screws (139).
4. Fig. 15. Disconnect at control board (302):
D Lead (D) from potentiometer.
D Lead (E) from transducer.
D Lead (B) from On/Off Switch connector.
5. Fig. 8. Remove five screws (122) from control
board and ground wire screw (122).
6. Remove connector (Y) at backside of pressure
control. Remove jam nut (Z) and control board
(302).
Removal
1.
Relieve pressure; page 4.
2. Fig. 8. Remove four screws (54) and
cover (52).
3. Disconnect lead (E) from control board (302).
4. Remove two screws (141) and guard (147). Care-
fully pull transducer connector through rubber
grommet (145).
Removal
1.
Relieve pressure; page 4.
2. Fig. 8. Remove four screws (54) and
cover (52) and two screws (139).
3. Disconnect lead (D) from control board (302).
4. Loosen set screws on potentiometer knob (50) and
remove knob, shaft nut, lockwasher (310) and

pressure adjust potentiometer (310).

5. Remove spacer (74) from potentiometer (310).

Pressure Control

Control Board

Pressure Control Transducer
Pressure Adjust Potentiometer
Installation
When installing replacement control board, follow
instructions with control board to set model type.
1. Fig, 8. Install control board (302) and jam nut (Z).
Install connector (Y) at backside of pressure
control.
2. Install ground wire and control board (302) with
six screws (122).
3. Fig. 15. Connect to control board (302):
D Connect ON/OFF switch connector (B).
D Lead (E) to transducer.
D Lead (D) to potentiometer.
4. Fig. 8. Push display connector into PC board close
display connector wings (A) on PC board. Install
display/cover (52) with four screws (54).
5. Remove pressure control transducer (61q) and
packing o-ring (61p) from filter housing (61e).
Installation
1. Fig. 8. Install packing o-ring (61p) and pressure
control transducer (61q) in filter
housing (61e). Torque to 30--35 ft-lb.
2. Carefully feed transducer connector through
rubber grommet (145). Install guard (147) with two
screws (141).
3. Connect lead (E) to motor control board (302).
4. Install cover (52) with four screws (54).
Installation
1. Install spacer (74) on potentiometer (310).
2. Fig. 8. Install pressure adjust potentiometer (310),
shaft nut, lockwasher (310) and potentiometer
knob (50).
a. Turn potentiometer shaft (310) clockwise to
internal stop. Assemble potentiometer knob
(50) to strike pin on plate (29).
b. After adjustment of step a., tighten both set
screws in knob 1/4 to 3/8 turn after contact
with shaft.
3. Connect lead (D) to control board (302).
4. Install plate (29) with two screws (139).
5. Install cover (52) with four screws (54).
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