How to Adjust the Belt of Treadmill

By Wendy Adams

Over time, your treadmill belt can fall out of alignment in two ways.

First, the belt can fall out of alignment to the point of rubbing against the side causing shredding of the belt edges. Either moving or not, the belt will appear to have slid to one side.

The belt can also lose tension over time. A simple check of the belt tells you whether the tension needs to be adjusted. With the treadmill stopped, lift the belt with your hand. The belt should lift between 3 and 4 inches if the tension is correct.

Your treadmill most likely came with an Allen wrench that will fit your machine. If not, finding the proper sized Allen wrench will not be a problem. Some adjustment bolts have a hexagonal head and some have a wrench head. The type of bolt will determine the type of adjustment method to use.

Caution: The belt should not be moving during tension adjusting. Overtightening the belt can cause excessive wear on the treadmill and its components.

Adjustment bolts are found on the rear roller of the treadmill. There are two kinds of adjustments. Look at the right side of the roller first. If the adjustment bolt has an Allen wrench head, there will be two adjustment bolts. A hex head means there will be a single bold adjustment.

Centering two-bolt adjustment

Remove the safety key and unplug the power cord. Do not overtighten the belt.

If the belt has slipped to the left, turn the left adjustment bolt clockwise, the right bolt counter-clockwise, 1/4 of a turn each with the Allen wrench.

Plug the power cord in, replace the safety key, and run the treadmill for several minutes. Repeat this process until the belt is centered.

If the belt has slipped to the right, turn the left adjustment bolt counter-clockwise, the right bolt clockwise, 1/4 of a turn each with the Allen wrench.

Plug the power cord in, replace the safety key, and run the treadmill for several minutes. Repeat this process until the belt is centered.

Centering single bolt adjustment

Remove the safety key and unplug the power cord. Do not overtighten the belt.

If the belt has slipped to the left, turn the left adjustment bolt clockwise 1/4 of a turn with the Allen wrench.

If the belt has slipped to the right, turn the left adjustment bolt counter-clockwise1/4 of a turn with the Allen wrench.

Plug the power cord in, replace the safety key, and run the treadmill for several minutes. Repeat this process until the belt is centered.

Belt Tension two-bolt adjustment

Remove the safety key and unplug the power cord. Do not overtighten the belt.

To tighten: turn both adjustment bolts clockwise 1/4 turn with the Allen wrench. To loosen: turn both adjustment bolts counter-clockwise 1/4 turn with Allen wrench.

Plug the power cord in, replace the safety key, and run the treadmill for several minutes. Repeat this process until each side of the belt can be lifted 3 to 4 inches.

Adjusting tension single-bolt adjustment

Remove the safety key and unplug the power cord. Do not overtighten the belt.

Place the wrench on the end of the tension nut and hold. Put a second wrench on the bolt head.

To tighten: turn the bolt clockwise. To loosen: turn the bolt counter-clockwise.

Plug the power cord in, replace the safety key, and run the treadmill for several minutes. Repeat this process until each side of the belt can be lifted 3 to 4 inches.

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