22
307–785
SPIN TEST
Before doing this procedure, follow the Pressure
Relief Procedure Warning on page 24 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts, or
electric shock.
Unplug the sprayer!
WARNING
For
checking armature, motor winding and brush electri
-
cal
continuity
.
Setup
Remove the drive housing. Refer to page 33.
Remove the pressure control cover. Remove the motor
shield
(59). Remove the fan cover (F)
and the inspection
covers (J).
Refer to Fig 22–1.
Disconnect the two leads from the motor to the bridge
(308).
Refer to Fig 22–2.
Armature Short Circuit Test
Quickly
turn the motor fan by hand. If there are no shorts,
the
motor will coast two or three revolutions before com
-
ing
to a complete stop. If the motor does not spin freely
,
the
armature is shorted and
the motor must be replaced.
Refer
to page 34.
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
Connect the two black motor leads together with a test
lead.
T
urn
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. Refer to page 25.
If
there is still uneven or no turning resistance, replace the
motor.
Refer to page 34.
J
F
308
303
309
302
71
59
Fig 22-1
Fig 22-2
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