Spin Test - Graco 231–034 Instructions And Parts List

WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
Use the spin test to check the armature, the motor
windings, and the electrical continuity of the motor
brushes.
Set up the spin test.
1. Relieve the pressure.
2. Remove the drive housing. See page 33.
3. Remove the pressure control cover, the shield
(59), the fan cover (F), and both of the inspection
covers (J). See Fig. 8.
4. Disconnect the two leads going from the motor to
the bridge (308). See Fig. 9.
Test the armature for an electrical short
circuit.
1. Relieve the pressure.
2. Quickly and manually turn the motor fan. If there
are no electrical shorts, the motor will spin two or
three revolutions before completely stopping. If the
motor does not spin freely, the armature is electri-
cally shorted and the motor must be replaced. See
page 34.
Test for electrical continuity between
the armature, the brushes, and the motor
wiring.
1. Relieve the pressure.
2. Connect the two, black motor–leads together with
a test lead.
3. Manually turn the motor fan at about two revolu-
tions per second. If there is uneven turning resis-
tance or no turning resistance when turning the
fan, check the motor brush area. Repair or replace
parts that are loose, worn or damaged. See page
25. If there is still a problem with the turning resis-
tance, replace the motor. See page 34.

Spin Test

59
Fig. 8
71
302
Fig. 9
F
J
303
309
308