Motor Start Board; On/Off Switch - Graco 231-298 Instructions-Parts List Manual

Electric, 110 vac 390st airless paint sprayer
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Motor Start Board

WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 9.
NOTE: See Fig. 21 for this procedure.
1. Relieve pressure.
2. Remove the junction box screws (56) and lower
the junction box (59).
3. Disconnect the motor wires (B) and the 3-wire
connector (A) from the motor start board (47).
Observe where connections are made.
4. Remove the screws (58) and motor start board
(47). Transfer the white thermal paste from the old
board to the new board.
5. Install the new motor start board. Reconnect all
wires. Install the junction box. Be sure no leads are
pinched against the motor or by the motor start
board. Also be sure the gasket (89) is installed.
CAUTION
Be sure the flat blade of the insulated male con-
nector is centered in the wrap–around blade of the
female connector when the connections are made.
Route all wires carefully to avoid interference with
the motor start board or junction box.
These precautions are essential to reduce the risk
of a malfunction.

On/Off Switch

NOTE: See Fig. 21 for this procedure.
1. Relieve pressure.
2. Remove the junction box screws (56) and lower
the junction box (59).
3. Remove the nut and rubber boot (55).
4. Disconnect the black wires from the ON/OFF
switch (52) and remove the switch.
5. Install the switch so the internal tab of the anti-
rotation ring (54) engages with the vertical groove
in the threads of the switch, and the external tab
engages with the blind hole (C) of the junction box.
6. Powder the inside of the rubber boot (55) with
talcum, then shake the excess out of the boot.
Install the nut and rubber boot and tighten.
7. Reconnect the ON/OFF switch black wires.
8. Install the junction box. Be sure no leads are
pinched against the motor or by the motor start
board. Also be sure the gasket (89) is installed.
MOTOR
BLACK/
WHITE
BLACK
B
89
59
58
Fig. 21
GREEN/
YELLOW
49
52
54
RED
C
56
55
A
47

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A series390st

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