ProForm offers a dizzying range of treadmills. With so many models revolving in and out of production every year or two, it's reassuring that simple troubleshooting procedures like adjusting the treadmill belt are standardized across the product line. It's not unusual for the repeated vibration of walking or running on a treadmill to require an occasional slight adjustment to keep your treadmill running at its best, and your ProForm treadmill came with a hex key that is the only tool you need to adjust the treadbelt.
If Your Treadbelt Moves Too Slowly
If your treadmill belt runs too slowly when you walk on it, the rear roller bolts may be too tight. Always unplug the treadmill before performing any maintenance. Then, kneel beside or straddle the treadmill deck. Slide one hand under each side of the treadmill belt and lift gently. If the treadbelt doesn't lift two to three inches off the platform with a gentle pull, it's too tight. Loosening the roller bolts should solve your problem.
The roller bolts are located in the rear end of the treadmill frame, one to each side of the treadbelt. Turn each bolt a quarter-turn clockwise to loosen it. Always check the treadbelt tension after each quarter-turn; if you loosen the bolts too far, you'll cause a different sort of problem.
If the Treadbelt Slips
If your treadmill's belt runs off-center or slips when you walk on it, the roller bolts are too loose. Once you've unplugged the treadmill, tighten both roller bolts a quarter-turn clockwise to correct a belt that slips when you walk on it. If the belt is off-center, however, you should tighten only one bolt.
If the walking belt runs off-center to the right, tighten the left-hand bolt by a half-turn. If the walking belt runs off-center to the left, tighten the right-hand bolt by a half-turn. Then plug the treadmill back in and run it for a few minutes to see if the belt comes back to center. Once the belt is centered, walk on it for a couple of minutes to verify it doesn't slip or move too slowly. You can also verify belt tension by sliding your hands under either side of it as described above; a properly-tensioned treadbelt will come up off the deck by two to three inches with gentle pressure.
Other Possible Solutions
If your treadmill belt repeatedly slips to the side or runs off-center, and adjusting the bolts fixes the problem only temporarily, contact ProForm customer support for further assistance.
But if your treadmill belt continues to move slowly when you walk on it, even after you've adjusted it and verified that it's at the proper tension, there's another possible fix. You may be using the wrong extension cord; try plugging the treadmill directly into an electrical socket. If that still doesn't work, check the surge protector.
Using a surge protector protects your treadmill against damage from unexpected electrical surges, but using the wrong type of surge protector may also cause your treadmill belt to run slowly; you should use a single-outlet surge suppressor that's rated for 120 volts AC and 15 amps.
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