Smooth Fitness 5.3P, User Manual

12 

Belt Adjustment and Tension 

WARNING! Do not overtighten rollers!  This will cause premature roller bearing failure!  

Belt adjustment and tension performs two functions:  adjustment for tension and centering. Your 
new treadmill comes pre-adjusted from the factory for tension and centering. Please follow the 
procedures below if the belt shifts left or right or if the belt slips while walking: 

WALKING BELT HAS SHIFTING TO THE LEFT (Diagram 1) 

First, unplug the power cord from the surge protector.  Using the hex key provided, turn the left 
rear roller adjustment bolt ¼ turn in the clockwise direction.  Plug the power cord back into the 
surge protector and run the treadmill at 2.5 mph.  You should see the belt start to correct itself, 
moving back towards the center.  Repeat the above procedure until the walking belt is centered.  
It may be necessary to set walking belt tension once you have completed this procedure if the belt 
feels like it is slipping while walking.  Refer to below to the “Walking Belt Slipping” instructions.  

WALKING BELT HAS SHIFTING TO THE RIGHT (Diagram 
2) 

First, unplug the power cord from the surge protector.  Using 
the hex key provided, turn the right rear roller adjustment bolt 
¼ turn in the clockwise direction.  Plug the power cord back 
into the surge protector and run the treadmill at 2.5 mph.  You 
should see the belt start to correct itself, moving back towards 
the center.  Repeat the above procedure until the walking belt 
is centered.  It may be necessary to set walking belt tension 
once you have completed this procedure if the belt feels like it 
is slipping while walking.  Refer to below to the “Walking Belt 
Slipping” instructions.  

WALKING BELT IS SLIPPING DURING USE (Diagram 3) 

First, unplug the power cord from the surge protector.  Using 
the hex key provided, turn both left and right rear roller 
adjustment bolts the same distance, usually a ¼ turn in the 
clockwise direction.  Plug the power cord back into the surge 
protector and run the treadmill at 2.5 mph.  You should now 
walk on the belt to determine if the belt is still slipping. Repeat 
the above procedure until the walking belt is not slipping.  The 
tension should be just tight enough not to slip.