True Fitness Z5 Series - Manual (Page 69)

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ension
Treadbelt Tension
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Z 5 S e r i e s Tr e a d m i l l O w n e r ' s G u i d e 
To assure maximum life of the treadbelt, roller and drive motor,
make sure the treadbelt tension is set correctly. (Your treadbelt has
been properly tensioned at the factory.)
Turn both rear roller adjustment bolts counter-clockwise until tread-
belt just begins slipping when walking on it, then turn both rear
roller adjustment bolts clockwise in equal quarter turn increments
until treadbelt stops slipping.
Note: Be sure to run on treadbelt to ensure that the treadbelt does
not slip while under load.
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