Johnson Horizon Fitness 7.0AT-04, Service Manual

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CHAPTER 2: PREVENTATIVE MAINTENANCE
If the running belt is too far to the right side: With the
treadmill running at 1 mph, turn the left adjustment bolt
counter-clockwise ¼ turn at a time (using the supplied
Allen wrench). Check the belt alignment. Allow belt to
run a full cycle to gauge if more adjustment is needed.
Repeat if necessary, until the belt remains centered
during use.
If the running belt is too far to the left side: With the
treadmill running at 1mph, turn the right adjustment bolt
counter-clockwise ¼ turn at a time (using the supplied
Allen wrench). Check the belt alignment. Allow belt to
run a full cycle to gauge if more adjustment is needed.
Repeat if necessary, until the belt remains centered
during use.