Brand new treadmill, just set it up. When you increase the speed greater at 1.5mph, you hear a thumping noise towards the back of the treadmill, very rhythmic in sound, similar to sound of a heartbeat just louder. treadmill has been calibrated and passed, but sound remains and if you increase speed higher, sound remains just occurs more often but carries same rhythm.
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Here are the only reason that can cause a thumping noise
Wheel and Tire Problems
Wheels can become bent from striking objects, and tires can develop bulges from broken belts or wear. Both problems may cause a thumping noise. Thumping sounds caused by wheel and tire problems will typically increase in frequency at higher speeds, though the sound may not be heard at lower speeds. These problems can often be spotted by visual inspection.
Worn or broken struts or strut mounts can create a thumping noise, especially when the vehicle hits a bump in the roadway. To test struts, bounce the rear of the car by forcefully pushing down on it and letting go. After letting go, the car should settle back to its original position without bouncing or noise.
Loose trim pieces near or in the wheel well can flutter in the wind while a car is being driven. These trim pieces may create a thumping noise as they strike other objects. A car owner can check trim pieces for looseness to determine if that is the source of the noise.
Many times, rear tires that are out of round or severely cupped or feathered, or that are out of balance can create this type of issue. My first recommendation would be to have them and the wheels on the rear of the car inspected. There may not seem like there is much wrong visibly if you look at just the tread of the tires, but a good tire tech can spin them up and give you some solutions, and the inspection itself is inexpensive. Hope this helps.
simple(maybe). go to the rear of treadmill,get the allen wrench that came with it,run at med-slow speed and adjust the rear roller with allen wrench. 1 turn per side 2 or 3 time then walk on belt until wont slip. all the problem is belt tension. also. make sure if it need lubrication under board and belt(some are lubless others dont).
It sounds like you have a drive motoer failing. The only other place that can be load or making noise is the front and rear roller. The rollers bearings when failing make a "popping" or "clicking" noise, and increases as you speen up. The motor "growls", and the faster you go the noise is..... well loud. The way to confirm this is to remove the motor hood, then start the treadmill on power/speed level 3. Be very carefull, and use a broom stick (wooden) to put on the drive motor while it is running. You should be able to "feel" what you are hearing. You should then raise the speed, and you will then feel the increase as well.
If u r seeing the increasing variation takeing effect on the panel but the speed does not increase in real, then there is nothing wrong with the push button for sure.
what it could be is ,
1. Your motor is getting overheat quickly and does not accept the higher speed commands.
2. it could be a belt slip also (do u hear any extra noice / vibration when u increase speed)
3. next time, pls unplugg the unit for atleast 4 hrs and when u start after that increse the speed very next moment and see if it works. if it does increase this way then it is time take look first on the belt ans then check the motor.
OPEN MOTOR SHROUD SO YOU CAN BETTER INSPECT THE UNIT CHECK THE DRIVE BELT THEN I WOULD CHECK THE RUNNING BELT TO SEE IF THEIR IS ANY DEBRIS THAT THE BELT ITSELF IS SPLITTING SINCE YOUR SAY A THUMPING SOUND. SINCE KEYS FITNESS MADE THIS UNIT THEY ARE NO LONGER IN BUSINESS, BUT TREADMILL DOCTOR HAD PURCHASED THE PARTS. SO GO TO TREADMILL DOCTOR.COM THEY MAY HAVE THE PARTS YOU NEED