Horizon Fitness T40 Service Manual page 53

Stoning the Motor Commutator
• Unplug the power cord from the wall outlet.
• Remove the brush covers on the drive motor and inspect the brushes and the
motor commutator for any uneven wear.
• If the surface of the motor brush is pitted, rough, or has burn marks, replace the
motor brush.
• Do not plug in the power cord and do not turn on the treadmill when the motor
brushes are removed from the drive motor.
• With the brushes removed, inspect the motor commutator for any unusual wear
or burn marks. If there is any abnormal marks or wear, stone the motor
commutator. Make sure to blow any dust or particles from the motor
commutator when finished.
• After you replace a motor brush, make sure the brush is seated securely and
makes full contact with the commutator before you plug in the power cord and
turn on the treadmill.
• Run the treadmill for 15 minutes at 3-5 mph to seat the brushes properly.
Inspect the motor commutator again for any unusual wear. Repeat stoning
process if necessary.
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