307889K ULTRA 500 AIRLESS PAINT SPRAYER - Graco Inc.

11. Test the brushes.
a. Remove the pump connecting rod pin.
b. With the sprayer OFF, turn the pressure control
knob fully counterclockwise to minimum
pressure. Plug in the sprayer.
c. Turn the sprayer ON. Slowly increase the
pressure until the motor is at full speed.
d. Inspect the brush and commutator contact
area for excessive arcing. Arcs should not
“trail” or circle around the commutator surface.
WARNING
CAUTION
Do not run the sprayer dry for more than 30 seconds
while checking the brushes to avoid damaging
the displacement pump packings.
12. Install the brush inspection covers and gaskets.
13. Break in the brushes. Operate the sprayer for at
least one hour with no load. Install the connecting
rod pin.
ELECTRIC SHOCK HAZARD
Do not touch the brushes, leads, springs
or brush holders while the sprayer is
plugged in to reduce the risk of electric
shock and serious bodily injury.
Power Supply Cord Replacement (Fig. 15)
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the illustrated Pressure Relief
Procedure warning on page 12 whenever
you are instructed to relieve pressure.
NOTE: Read the GENERAL REPAIR INFORMATION
on page 18 before doing this procedure.
1. Relieve pressure.
307
317
2. Remove the pressure control board/cover (301).
3. Disconnect the power supply cord (314),
both leads from the ON/OFF switch (307), and
the green wire to the grounding screw (317).
4. Loosen the strain relief bushing (315) and remove
the power supply cord (314).
301
5. Install the new power supply cord in the reverse
order.
315
6. Install the proper plug on the other end of the power
supply cord. Follow all local codes to select the
proper plug.
314
Fig. 15