5 - 37 ELECTRICAL
GEM Service Manual November 2007
MOTOR MAGNET AND
SPEED SENSOR
(TACHOMETER)
DESCRIPTION
A small circular magnet is mounted to the motor
spindle. A sensor, attached to a pigtail, sits in close
proximity to the magnet. Access to the magnet and
sensor is gained through a small plate in the center
of the motor's end panel.
Fig. 22 Speed Sensor (Tachometer) Assembly
1 - Speed Sensor (Tachometer) Assembly
OPERATION
When the motor's armature rotates the magnet
rotates also. The sensor detects the magnet's
motion, and transmits a signal through its pigtail to
the motor controller.
REMOVAL
1. Disconnect and remove screw attaching wire
harness to motor (see figure 20).
2. Remove sensor/pigtail assembly.
INSTALLATION
1. Position sensor/pigtail.
2. Connect the wire harness and install the screw.
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