Graco 3400 User Manual download pdf (Page 13)

Pressure Control

310813 Rev C 13

Control Board

Removal

1. Relieve pressure, page 5.

2. FIG. 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. FIG. 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. FIG. 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. FIG. 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

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Graco 3400 User Manual Page 13

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