Graco 3400 - Manual (Page 13)

Pressure Control
310813 Rev C 13
Control Board
Removal
1. Relieve pressure, page 5.
2. F IG . 13. Remove two screws (91) and swing down
cover (77)
3. Remove strain relief bushing (24a).
4. Disconnect engine and ground wires.
5. Disconnect at control board (90):
•
Lead (D) from potentiometer
• Lead (E) from transducer
• Lead (B) from ON/OFF switch
• Clutch wires
6. Remove four screws (89) and control board (90).
Installation
1. F IG . 13. Install control board (90) with four screws (89).
2. Connect at control board (90):
•
Clutch wires
• Lead (B) from ON/OFF switch
• Lead (E) from transducer
• Lead (D) from potentiometer
3. Connect engine and ground wires.
4. Install strain relief bushing (24a).
5. Swing up cover (77) and secure with two screws (91).
Pressure Control Transducer
Removal
1. Relieve pressure, page 5.
2. F IG . 13. Remove two screws (91) and swing down
cover (77)
3. Disconnect lead (E) from control board (90).
4. Pull transducer connector through rubber grommet (78).
5. Remove pressure control transducer (20) and o-ring (63)
from filter housing (30).
Installation
1. F IG . 13. Install o-ring (63) and pressure control transducer
(20) in filter housing (30). Torque to 35 - 45 ft-lb.
2. Install transducer connector and rubber grommet in
control housing.
3. Connect lead (E) to control board (90).
4. Swing up cover (77) and secure with two screws (91).
Pressure Adjust Potentiometer
Removal
1. Relieve pressure, page 5.
2. Fig. 13.Remove two screws (91) and swing down
cover (77).
3. Disconnect lead (D) from control board (90).
4. Loosen set screws on potentiometer knob (68) and remove
knob, shaft nut, lock washer and potentiometer (70).
5. Remove seal (69) from potentiometer.
Installation
1. Install seal (69) on potentiometer (70).
2. F IG . 13. Install potentiometer, shaft nut, lock washer and
potentiometer knob (68).
a.Turn potentiometer shaft clockwise to internal stop.
Assemble potentiometer knob (68) to strike pin on
cover (77).
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 (90).
4. Swing up cover (77) and secure with two screws (91).
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4