Horizon Fitness 1.1T Service Manual page 10

Tensioning or Aligning the Running Belt
Tensioning the Running Belt:
If you can feel a slipping sensation when running on the treadmill, the running belt must
be tightened. In most cases, the belt has stretched from use, causing the belt to slip.
This is a normal and common adjustment. To eliminate this slipping, tension both the
rear roller bolts with the appropriate sized Allen wrench, turning both the left and right
bolt 1/4 TURN as shown below. Try the treadmill again to check for slipping. Repeat
if necessary, but NEVER TURN the roller bolts more than 1/4 turn at a time.
NOTE: The belt tension is set properly when the running belt is ¼ of an inch from
the deck, towards the rear roller.
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