Treamill Proform 770 jerks when I run
#1
12-29-09, 12:45 PM
Treamill Proform 770 jerks when I run
I have a Proform 770 EKG Treadmill that jerks when I run. It used to sqeak when I ran (only when feet land) but now it jerks for a half second then continues on again. This only happens when running hard, not when walking. Any idea what to look at?
~Thanks in advance
~Thanks in advance
#2
12-29-09, 01:38 PM
Group Moderator
Try looking at the bottom of the conveyor belt on which you run. Most belts have a slippery type backing and the frame of the treadmill has a smooth steel, plastic or graphite sheet to keep the friction to a minimum when your weight presses down. If either is worn or missing your weight crashing down when running creates a huge amount of friction for a second causing the treadmill to slow down or briefly stop. I can also say from experience that a spilled drink can cause a similar problem if it seeps under the belt.
If that is not it. Unplug the treadmill (safety first). Then remove the cover over the motor & drive area. There should be a drive belt running between a pulley on the motor and another pulley on the running tread/conveyor. If this belt is worn or if the tension is too loose it may slip under heavy load (when you are running).
If that is not it. Unplug the treadmill (safety first). Then remove the cover over the motor & drive area. There should be a drive belt running between a pulley on the motor and another pulley on the running tread/conveyor. If this belt is worn or if the tension is too loose it may slip under heavy load (when you are running).
#3
12-30-09, 06:46 AM
Fixed
That did it. The motor just needed to be tightened a smidgen.
I took everything apart and the belts appearded fine. I ran on it again and made the jerking happen. Then I could see that the motor kept turning but the belt was slippin on the motor output shaft. It did not appear loose but I tightened it just a minor bit and that made all the difference.
~Thanks!!!
I took everything apart and the belts appearded fine. I ran on it again and made the jerking happen. Then I could see that the motor kept turning but the belt was slippin on the motor output shaft. It did not appear loose but I tightened it just a minor bit and that made all the difference.
~Thanks!!!
