CYBEX Pro+ Service Manual page 46

10. Remove the drive motor brush access covers.
A. Squeeze each of the two rectangular brush covers to remove it from the motor. See Figure 15.
Figure 15
B. Lift off the round brush cover. See Figure 15. If necessary carefully pry the cover up using a fl at
head screwdriver.
11. Remove the brushes.
A. Using needle nose pliers, unplug the yellow brush wear indicator wire from the round access hole
and the brush wire from the rectangular hole.
B. Press each brush spring in and slowly pull it out. It will be spring loaded.
out the brushes, take note which way the brushes are orientated. You will need to replace them in
the same orientation.
C. Pull each brush out from the drive motor.
12. Examine the brushes and commutator.
A. Inspect the commutator by looking through the top brush holder into the motor. Slowly spin the
motor by turning the fl ywheel. Look for noticeable damage and for signs of wear such as arcing,
pitting, burning, or uneven wear. Commutator bars that are 'dirty penny' brownish copper are in
great condition. However, some commutator bars may be pitted or blackened on one edge. Too
many of these indicate a worn commutator, and the motor should be replaced. The commutator
may be cleaned with narrow commutator stone if carbon build-up is present. NOTE: File down the
stone if it won't fi t in the brush holder hole. Brush dust can be loosened from the brush holder area
by lightly fi ling the surfaces.
B. Inspect the brushes for signs of excessive wear or cracks. The motor brushes must be replaced if
one or both is worn to 0.4" (10.2 mm) or less in length, is broken or chipped, has a broken spring
or binds in the motor.
13. Replace the brushes.
NOTE: If a new brush does not slide in and out easily, the edges or corners of the brush can be lightly
fi led down. The motor may make a clicking noise as new brushes wear in. If you reinstall the
original brushes it is good to install them facing their original position. Reversing the orientation
of the brush can cause a clicking noise during operation until the brushes wear in.
Service
Page 4-18
Cybex Pro+ Treadmill Service Manual
Drive Motor Brush
Access Cover
Round Brush Cover
NOTE: Before you pull