Spin
Test
ELECTRIC
SHOCK
HAZARD
springs or brush holders while the
Do not touch the brushes, leads,
sprayer is plugged in to reduce the risk
of
electric shock and serious bodily injury.
INJECTION HAZARD
To reduce the risk of serious injury,
follow the illustrated
Pressure Rellef
Procedure
warning on page 12 when-
ever you are instructed to relieve pressure.
tor does not spin freely, the armature is shorted and the
revolutions before coming to a complete stop.
If
the
mo-
motor must be replaced. See page 27.
trical continuity.
For checking armature, motor winding and brush elec-
Setup
25.
Relieve pressure. Remove the drive housing. See page
Remove the motor shield (59), the fan cover
(F)
and the
inspection covers
(J).
See Fig.
9.
Remove the pressure control/cover(301). Disconnect
the
-
and
+
leads from the motor to the pressure con-
trol/cover terminals
M-,
and
M+.
See Fig. 10.
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
/
Fig. 9
J
DlZ4A
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
Relieve pressure. Connect thetwo black motor leads to-
about two revolutions per second.
gether with a test lead. Tum the motor fan by hand at
lowing: broken brush springs, brush leads, motor leads;
If
there
is
uneven or no turning resistance, check the
fol-
loose brush terminal screws, motor lead terminals; worn
brushes. Repair parts as needed. See page 19.
the motor. See page 27.
If
there
is
still uneven or no turning resistance, replace
Flg.
10
308-560
17
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