Keys Fitness MS1200GT, Owner'S Manual

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 to the left or right or  while walking: 

WALKING BELT IS SHIFTING TO THE LEFT (Diagram 1) 

First, turn treadmill on to run at 1 mph.  Using the hex key provided, 

turn the left rear roller adjustment bolt ¼ turn in the clockwise 

direction.  Next, 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  below to the 

“Walking Belt Slipping” instructions.  

WALKING BELT IS SHIFTING TO THE RIGHT (Diagram 2) 

First, turn the treadmill on to run at 1 mph.  Using the hex key 
provided, turn the right rear roller adjustment bolt ¼ turn in the 

clockwise direction.  Next,  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 
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.   

♦

Turning the hex key counter clockwise brings the rear rollers and 

belt towards you. Turning the hex key clockwise pushes the rear 
roller and belt away form you.

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Belt Adjustment and Tension