FitnessRepairParts.com has a walking belt for Precor 9.21 treadmill (it says it is used on four different versions of the 9.21... make sure your specific model number is listed)
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This sounds like you are dealing with a worn deck and belt. If you apply wax periodically, you can prolong the life of these components. Using your serial number, the link below will help you find the deck and belt needed for your model.
If you really have a 'black dust' issue, your machine would be at least 7 years old - if it is less than 10 years, the parts would be under warranty, assuming you bought it new. One or both rollers and the walking belt would need to be replaced. You were advised to call Precor - did you? I am surprised the retailer did not offer any help - this seems like poor customer service.
This sounds like either 1 or 2 things. Either the belt is worn to the point it needs to be replaced or the belt and deck need to be lubed. The video below will help you by showing you how to apply the lube and link below will give you an option to purchase the new belt and deck. Please use your model and serial number to narrow down your choices.
This really sounds like the results of long term use without lubrication or wax between the belt and deck. Chances are you will need to replace the running belt and the deck or flip the deck if it has not already been done. The friction builds up between the deck and belt and caused the electronic components to overheat. The machine is shutting down as a precautionary measure. It will do this only so many times before the electronics are zapped. Start with the deck and belt. Hopefully the electronics are okay. With your model and serial number, you can visit our website and view the products we have available for your particular machine. Precor Repair Parts for 9 21s 9 21si Treadmills Consumer SPORTSMITH net
Adjusting Tension on a Treadmill Running Belt
It is necessary to properly tension a treadmill belt when it is replaced. After time, a belt can stretch and may begin to slip. When this happens, it is necessary to adjust the tension of the running belt to stop it from slipping. Manufacturers of treadmills generally agree on one of three procedures for how to tension a treadmill running belt.
Adjust for no slippage of the treadmill walking belt on the front roller (Often referred to as the "Stomp Test")
This procedure works well for a previously installed belt that is now slipping.
Underside of belt should be free of any glazing/wax buildup.
Rollers must also be free of wax buildup.
Be sure belt tracking/centering is correct before proceeding.
The most popular speed for this adjustment is 2mph to 3mph.
Try to slow the belt by applying pressure with your foot against the belt movement while grasping the handrails. If the running belt slow, slips or stops (and the front roller does not) adjust BOTH adjustment bolts 1/4 turn clockwise. Test again and repeat adjustment if necessary.
This procedure works well when installing a new belt.
This procedure requires you to stretch the belt. Depending on the manufacturer*, this varies between .4 and .6 percent. A dial on the gauge or caliper will indicate the amount of stretch. *Consult the owner/service manual for proper tension.
If you are working on a previously tensioned belt you will need to release the tension before attaching the gauges or calipers.
Gauges or Calipers unavailable
Release the tension on the belt.
Using a yard stick or tape measure, place two marks on the left and right edges of the belt and deck 36 inches apart (or 50 inches if you prefer).
Adjust the left and right tensioning bolts until both sides measure 36 3/16 inches (or 50 1/4). This is equal to .5% of stretch.
Test for proper tracking and tension, adjust if necessary.
When a running belt has excessive wear, it creates a lot of friction which causes the drive motor to work harder. When the drive motor works harder it will start overheating. If the belt is not lubricated periodically, it will ruin the deck, the drive motor, and cause other electrical problems such as tripping the breaker [after a while, the circuit breaker on the treadmill will need to be replaced.
It is suggested to lubricate the belt every month. At this point, you may need to replace both your deck and your running belt.
Check your Amps on the circuit that is being tripped. The treadmill needs 15 Amps to run. If you have a 15 Amp circuit that is running the treadmill and other electronics (or lights), the circuit will trip. You may need to replace the circuit with more Amps.
hi,
Treadmill's belt get slipped when the the belt expands due to the usage and wear and tear. In all teradmill's there is an option for tighten the belt. I have added here some videos related to the belt tightening of treadmills. so many makes of treadmills the have similar adjustment. it will help you a lot to adjust the belt of your treadmill. you need allen keys to adjust the screws. watch the video and do the same. If you need further assistance fell free to contact me through fixya.
FitnessRepairParts.com has a walking belt for Precor 9.21 treadmill (it says it is used on four different versions of the 9.21... make sure your specific model number is listed)
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