Belt is moving but when i start walking on it it sometimes stalls
SOURCE: I am trying to repair the slippage on my Proform
Most treads have two bolts on the rear roller. To tighten turns these bolts clockwise. Depending on how bad the problem is, I usually turn a 1/4 turn at a time. Walk on the machine to check tension. Once tension is correct turn right side bolt or left side bolt to center belt. Remember belt will travel to side with least resistance. ie.. if you want the belt to go to the left- tighten the right side(clockwise) Centering the belt is easier with machine running at about 2-2.5 if belt is not rubbing on the sides.
SOURCE: my treadmill Proform caliber walk... belts keeps
The deck needs to be lubricated. The lubricant can be purchase @ gympart.com. LUBRICATION PROCEDURE: 1. Turn off and unplug treadmill. 2. Cut off the end of the tube of lubricant. 3. Holding the tube in one hand, insert the tube underneath the treadbelt halfway between front and back and halfway between right and left. 4. Squeeze the full contents of the tube onto the deck in a circular pattern in the center 1/3 of the deck. 5. Plug in
and turn on treadmill, then walk normally on treadmill at 0.5 mph for five minutes
SOURCE: Proform crosswalk, the walking belt
If the console takes batteries, replace them. If this does not work or your console does not require batteries, check the reed switch or optic sensor. Reed Switch: Unplug the treadmill and remove the motor hood cover. The reed switch is mounted on the frame next to the front roller pulley. There is a magnet glued into the front roller pulley. When adjusting the reed switch, make sure it is pointing directly at the magnet. Move the tip of the reed switch within 1/8" of the magnet. Also, check to see that the wire is not damaged, and is connected to the console.
Optic Sensor: Unplug the treadmill and remove the motor hood cover. The optic disk and sensor are located either at the end of the motor or the right hand side of the front roller. The optic disk spins between two sensors on the optic switch. The disk must spin freely without touching either sensor. The sensors can be moved by loosening the adjustment bolt holding the switch to its bracket. The switch can then be slid. Center the disk. 
and turn on treadmill, then walk normally on treadmill at 0.5 mph for five minutes
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