My treadmill has been running fine until recently when i was on it the running mat starts chugging. I have tried loosening and tightening the tension but with no success. What else might it be.

you need to tighten the w/belt. the side that the belt goes to tighten 3 quarter turns. now on the other side loosen 2 quarter turns. turn on the the belt on 3or 4 setting the belt should start moving over when it get to where you want it tighten the sid e you first loosen 2 quarter turn. then run it at higher speed to see if it stays its trial and error remember rightie tightie leftty loosie. in the end you want equal tension with the rollers bolts ps good tension is 2 -3 inches up when lifting up the sides of the w/belt

re ajust the rear roller, with a allen screw or hex nut, too tighten up, meaning putting more tention on the Mat belt, that you walk on, that should solve the problem,.

It looks like you will physically have to inspect the treadmill form under the motor shroud, front roller, frame and to the end where the belt tension bolts are. To see if their anything bent or misalign, this will take some time with good lighting and a extra pair of eyes. You will even have to start the treadmill and watch the entire sequence closely until you see whats happening with traveling running belt. This what I would do Good Luck!!

1. Inspect belt and deck. The deck should be smooth. The belt should have a consistent feel from side to side (a belt can be worn out without any sensory signs of a problem). If you feel deep grooves in the deck or uneven wear on the underside of the belt, part replacement is necessary. Continued use of your treadmill may damage expensive electrical components. 2. To inspect the belt and deck visually or to clean underneath the belt before applying lubricant, the belt must have the tension reduced. Loosen the tension roller by following the instructions in your owner’s manual. Do not loosen the bolts in the tension roller too far or the bolts will come out of the roller shaft. This step may not be necessary for your treadmill model or belt and deck condition. 3. Contaminants are the worst enemy of your belt and deck. Some treadmills may have an excessive accumulation of dirt and contaminants. If these are trapped during the belt lube process, significant damage will occur. If contaminant removal is necessary, loosen the belt by following step 2, lay the treadmill on its’ side, and use a nylon brush to loosen contaminants that have accumulated on the inside of the belt. Clean the deck with mineral spirits in a well-ventilated area. Allow the deck to dry before lubing or tightening the belt. 4. After completing the steps above go to your local hardware store and purchase a can of silicone spray ( Pyroil, Napa etc ) attach the nozzle and proceed to spray length wise starting at the motor shroud to 2/3 down the deck repeat the process on the other side then re-tension the belt according to you owner's manual. Start unit and proceed to walk on it if the unit shuts down again then belt and deck needs to be replaced or your in the market for a new treadmill.

If the walking belt slips when walked on, first remove the key and UNPLUG THE POWER CORD. Using the hex key, turn both idler roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each edge of the walking belt 2 to 3 in. (5 to 7 cm) off the walking platform. Be careful to keep the walking belt centered. Then, plug in the power cord, insert the key, and carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.
If their is still slippage then the drive belt will need to be adjusted.
Find the motor mounts. Many motors in Icon treadmills have a main pivot joint in which a bolt runs the full length of the motor mount. This bolt will require loosening to provide maximum adjustability. Find the set bolt(s) on the motor.
This is typically run through only one side of the motor mount or may be on both sides but it does not run the full length of the mounting. Loosen this bolt but do not remove.

The drive belt must be tensioned by hand. While one person applied increased tension to the drive belt, the other person should tighten the motor set bolt(s) that are described above. Tighten the bolt and test. If the problem is not corrected, if problem persist replace drive belt

If the walking belt slips when walked on, first remove the key and UNPLUG THE POWER CORD. Using the allen wrench, turn both rear roller adjustment bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift the edges of the walking belt 3 to 4 inches off the walking platform. Be careful to keep the walking belt centered. Plug in the power cord, insert the key and run the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

Sounds like the belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns.

You have 1,2 or maybe 3 problems. 1st is you need to remove the cover over the motor. The belt that the motor turns may be slipping. You need to loosen the bolt that keeps the tension on the drive belt. Push down to tighten manually and then tighten bolt. While your in there you should check the drive belt for wear. If you have used the treadmill a lot it may need replacement. $20 from readmilldocter.com The walking belt if badly worn can be replaced for like $99 but probably is fine. put all back together and tighten tension. Should be able to lift walking belt 3 to 4 inches from center sides. Any less and its too tight. Its probably better to just replace the drive belt anyway. This should work. Do not over tighten ever. This is the cause of most problems.

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.

Hi, I don't know which particular treadmill you have but most all treadmills use the same type of belt tension and tracking, which is an allen screw adjustment on the rear tension bar. One on either side. Treadmills normally come with an allen wrench, and could be attached on the treadmill somewhere, if not then use one of your own the proper size. Make the adjustment with the unit running at its slowest speed. Clockwise tightens the tension and will draw the belt. Good Luck, this should Fixya!