Electric Motor Tests; Open Circuit Motor Test; Motor Types; Motor Circuits - Toyota 7BPUE15 Service Manual

Toyota Orderpicker Model

Electric Motor Tests

Shunt-Wound Motor
A 1
Series-Wound Motor
Permanent Magnet
Motor
Figure

Motor Circuits

Motor Types

Refer to Figure 5-3.
shunt-wound or series-wound drive
A
motor has four external connections: two
armature and two field (S,
(A)
series-wound lift motor has only two
A
external connections because the
armature and field windings are connected
internally.
5
1
00700-CL222-05,
15
Service Manual
I
or D).
E,
March 2005
permanent magnet steer motor uses
A
permanent magnets a s fields and has only
two external connections.
N : Field connections may be labeled S.
O TE
Shunt-wound motor field connections
may be labeled
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:
Isolate the motor from the truck circuit by
1.
removing the power cables. Use two
wrenches to avoid twisting the terminal
stud.
2. With the motor a t room temperature,
connect the leads of a digital ohmmeter
between the individual circuits in the
motor.
5 .
Section Troubleshooting
Electric Motor Tests
Series-wound motor
E.