Tennant 5680 Operator's Manual page 58

MAINTENANCE
6. Observe the shape of the brush patterns. If
the brush patterns have parallel sides, the
brushes do not need taper adjustment.
If one or both of the brush patterns are
tapered, the brushes will have to be adjusted
to straighten the brush pattern.
A. Remove the idler door by pushing down
on the mounting spring and the idler
door, then pulling out on the bottom of
the door. Push down on the spring until
the door releases from the scrub head.
Pull the idle plug off the brush.
B. While holding the flat end of the idler
shaft with a wrench, loosen the
mounting screw on the outside of the
idler door.
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