Replacing The Electric Motor And Capacitor - Graco EM 390 Instructions And Parts List

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-
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.
NOTE: The replacement capacitor includes a new resis-
tor, installed.
13
1
Fig 22–1
23d
(located under
this cover)
23
27
37
7
4
3
Fig 22–2
MOTOR
LEADS
BLACK
GREEN & YELLOW
RED
PINK
BROWN
303
23f
41
0749
303
1
0675