Spin Test - Graco ULTRA 500 231-032 Instructions-Parts List Manual

WARNING
To reduce the risk of serious injury, follow the illus-
trated Pressure Relief Procedure warning on
page 24 whenever you are instructed to relieve
pressure.
For checking armature, motor winding and brush electri-
cal continuity.
Setup
Relieve pressure. Remove the drive housing. See page
33.
Remove the pressure control cover, the motor shield
(58), the fan cover (F) and the inspection covers (J). See
Fig 22–1.
Disconnect the two leads from the motor to the bridge
(308). See Fig 22–2.
Armature Short Circuit Test
Relieve pressure. Quickly turn the motor fan by hand. If
there are no shorts, the motor will coast two or three revo-
lutions before coming to a complete stop. If the motor
does not spin freely, the armature is shorted and the mo-
tor must be replaced. See page 34.
307–758
22

SPIN TEST

72
302
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
Relieve pressure. Connect the two black motor leads to-
gether with a test lead. Turn the motor fan by hand at
about two revolutions per second.
If there is uneven or no turning resistance, check the fol-
lowing: broken brush springs, brush leads, motor leads;
loose brush terminal screws, motor lead terminals; worn
brushes. Repair parts as needed. See page 25.
If there is still uneven or no turning resistance, replace the
motor. See page 34.
58
303
309
F
J
308