Leveling your E Series Treadmill
Before you plug in the treadmill, make sure it is where you plan to use it and it is level to the ground. If necessary, level your treadmill using the two adjustable feet under the tailroller. Loosen the lock nuts, rotate the feet until the treadmill is stabilized, and retighten the lock nuts.
Leveling 
Feet
ATTENTION
Star Trac recommends that treadmills be spaced a minimum of 20.0 inches (0.5 m) apart to allow safe and easy ingress and egress. Even more importantly, there must be at least 48 inches (1.25 m) of free space behind the treadmills.
As with any motorized equipment, the area where treadmills are located must be free of obstructions and fixtures with sharp edges to prevent injury in the event that a user trips or loses balance and falls.
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