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22
307–758
SPIN TEST
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.
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.
J
F
58
Fig 22-1
01577
308
303
309
302
72
Fig 22-2
01225