Graco Inc EM390 instruction manual Replacing the Electric Motor & Capacitor, 303, 23f

Models: EM390

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REPLACING THE ELECTRIC MOTOR & CAPACITOR

WARNING

To reduce the risk of serious bodily injury, including fluid injection or splashing in the eyes or on the skin, or injury from moving parts, always follow the Pressure Relief Procedure Warning on page 16 before checking, adjusting, cleaning or shutting off the sprayer. Unplug the power supply cord.

1.

Disconnect the hose at the displacement pump.

2.

Remove the drive assembly. See page 21. The pump,

 

connecting rod and bearing can stay assembled to

 

the drive assembly.

3.

Drive out the pin (27) and remove the gear (37). See

 

Fig 22±2.

4.

Remove the pressure control cover (41). Disconnect

 

the motor leads as shown in Fig 22±1.

5.

Unscrew the connector (13 and 303) nuts on both

 

ends of the conduit (1). See Fig 22±1.

6.

Remove the motor mounting screws (7). Lift the mo-

13

 

MOTOR

 

 

LEADS

 

1

BLACK

 

 

 

 

GREEN & YELLOW

 

 

RED

 

 

PINK

 

 

BROWN

 

 

303

 

 

23f

41

tor and carefully guide the wires through the pressure

control connector (303). Remove the conduit (1) from

wires. See Fig 22±2.

CAUTION

Pull the motor leads through the conduit one at a time to avoid loosening the terminals.

7.Loosen the locknut and unscrew the connector (13) from the motor. Do not twist the wires. See Fig 22±1.

8.Install the new motor in the reverse order of removal.

NOTE: Install the new circuit board (23f) which is in- cluded with a new motor. Do not reuse the old board. See page 26 for installation.

Capacitor

1.Remove the capacitor (23d) cover. See Fig 22±2. Re- move the flag connectors from the old capacitor and connect them to the new capacitor. Replace the cover.

Fig 22±1

23d

(located under this cover)

23

27

37

7

4

3

0749

303

1

NOTE: The replacement capacitor includes a new resis- tor, installed.

Fig 22±2

0675

 

22307-724

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Graco Inc EM390 instruction manual Replacing the Electric Motor & Capacitor, 303, 23f