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Proform 770 EKG treadmill (slipping and loud screech)

I have a Proform 770 EKG treadmill. The model number is 831291661. Less than one minute of walking on the treadmill, I almost slipped. After applying pressure on the belt (from the feet), I almost fell twice. Accompanied with that is a screeching sound. With one foot on the side of the rail, I applied pressure with my other foot on the walking belt. The belt stops and screeches as long as the pressure is applied. Once I took that foot off the walking belt, the walking belt continues to run "normally". This slipping and screeching occurs when pressure is applied to the walking belt at low and high speeds.

Any help is appreciated.

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2 Answers from these members:
Manage My Life
I can understand how frustrating it maybe when your treadmill is not working correctly. I was able to find a link that would i believe will help you determine what the issue might be.
by Manage My Life
November 15th, 2010
Answered in 24 minutes
0 votes
Mark T
Thank you for your question.

I am sorry you are having a problem with the treadmill. I suspect one of the belts is loose. I recommend unplugging the treadmill and remove the motor cover. Then plug the treadmill back in and carefully start the treadmill. When you put you foot on the walking belt watch the front roller area. If the roller continues to spin when the walking belt stops, you need to adjust the walking belt. I have provided you with the instructions for adjusting the walking belt below.

If the roller stops either the drive belt is loose or the roller pulley broke loose from the roller. If the pulley broke loose from the roller, you need to replace the roller. If it is just a loose belt, you can adjust the belt. To adjust the drive belt, loosen the bolts that mount the motor. By hand, pull the motor back so the belt is tight. Now have someone tighten the mounting bolt while you hold the motor. Now carefully walk on the treadmill and make sure the belt is not slipping. If the treadmill works fine, you can reinstall the motor cover. I hope this is helpful.

Please let me know if you need further assistance.

Here is a link to order any parts you need.

Sears Parts Direct


If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:

Sears Home Services


Thank you for using Manage my life.

Mark T.
by Mark T Earned 3,053 community points in Treadmills
November 16th, 2010
0 votes
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