Toyota Orderpicker Model
7BPUE
15
Service Manual
Section
5.
Troubleshooting
Electric Motor Tests
Shunt
-
Wound Motor
S2lE2lD2
A
1 S1lEIlDI
Series
-
Wound Motor
sl?
Electric Motor Tests
A
permanent magnet steer motor uses
permanent magnets as fields and has only
two external connections.
N
O
T
E
:
Field connections may be labeled S.
Shunt
-
wound motor field connections
may be labeled
E.
Series
-
wound motor
field connections may be labeled D.
Open Circuit Motor Test
An
open circuit is one in which the electrical
circuit within the motor has been broken. This
can be caused by:
Bad brushes or brush springs
Broken wire in the field or armature
winding
Loose or bad connection
Refer to Figure
5
-
3
for the following procedure:
1.
Isolate the motor from the truck circuit by
removing the power cables. Use two
wrenches to avoid twisting the terminal
stud.
I
2.
With the motor at room temperature,
connect the leads of a
digital ohmmeter
Permanent Magnet
Motor
Figure
5-3.
Motor Circuits
Motor Types
Refer to Figure
5
-
3.
A
shunt
-
wound or series
-
wound drive
motor has four external connections: two
armature
(A)
and two field
(S,
E,
or D).
A
series
-
wound lift motor has only two
external connections because the
armature and field windings are connected
internally.
-
between the individual circuits in the
motor.
00700
-
CL222
-
05,
1
5
March 2005
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