I have about a 5 to 10 year old. 9.31 precor. after running for 5 min. It would intermittently slow maybe halp mph. It wouldnt show it on the display. But it sounded as if the motor was slowing

John Mazmanian

• 832 Answers
• Posted on Mar 14, 2010

SOURCE: My Precor 9.21 si Treadmill shuts down upon

Hey Doug,

Just wondering has this unit ever had the running deck flipped over if not this may be sighs of worn deck or belt or both! What is starting to happen is that at the higher speed the unit is starting to draw more current, so the motrol control board will sense this and will shut down so it won't damage either the motor or board. What starts as an occassional shut down will progressively become more frequent. Simple test is put your hand palm down between the belt and deck,if you feel uneven ridges then the deck needs to be flipped over and when you pull out your hand out and their is a black sooty film on the back of it ,then that seals it this means that the composite material is being shaved off. Most likely the belt will have a smooth glazed feeling in the middle part of it. and well also need replacing.

SOURCE: wax or silicone on my 10+ year old Precor M9.21

Use silicone to lube your treadmill.

John Mazmanian

• 832 Answers
• Posted on May 14, 2010

SOURCE: Noisy precor treadmill motor

that sound is due to the bearing failing inside the motor this is cause by capacitance discharge thru the armature thru the bearings. these unit can be rebulit I 've done plenty

Ross Metcalfe

• 135 Answers
• Posted on Feb 26, 2011

SOURCE: Have a precor 9.20.

First, inspect the walking deck for damage (scratches, gouges, worn surface) and check the belt for wear. Feel the outer edge of the underside of the belt, then the center. The center should be rough like the outer edge. If it is smooth or fuzzy, the belt is worn out. If deck and belt are OK go ahead and lube the deck. I think Procor uses a standard parafin wax you buy at the grocery store, but check your manual to be sure. Apply the lube to the walking deck and try the machine again.

ernesto cuadra

• 12223 Answers
• Posted on Nov 21, 2011

SOURCE: My precor 956i sets the reset button off after 20 mins of use. It is on its own 20 amp circit.Sometimes it shuts off sooner

You have mixed problems: mechanical-electical-electronics
I am giving a combo for solutions Watch the videos-tips for mechanical adjustments firts:
http://www.youtube.com/watch?NR=1&v=USSgbsZbDLQ
http://www.youtube.com/watch?v=hKbAqvuOBS0&feature=related
http://www.youtube.com/watch?NR=1&v=KiEZDNe0F8Q
http://www.youtube.com/watch?v=wjrVjYe2LYQ&feature=related
http://www.youtube.com/watch?v=CuMjcPLYehw&feature=related
http://www.youtube.com/watch?v=yX_0vRPdMfU&feature=related
http://www.youtube.com/watch?v=zXeHMWTcLUY&feature=related
http://www.youtube.com/watch?v=dxpOOPetVLo
If the problem persist, go to the 2nd phase:

http://www.youtube.com/watch?v=qgb2TY3WCkg&feature=related
http://www.youtube.com/watch?v=-oeXTKqWECw&feature=related
http://www.youtube.com/watch?v=GPI6dFJCUA4
http://www.youtube.com/watch?v=bF3OyQ3HwfU&feature=related
http://www.fixya.com/support/r10724803-measure_voltage_in_transforme_fitness
http://www.fixya.com/support/r10786838-test_procedure_dc_motor

http://www.youtube.com/watch?v=23ZgWaVEQjA
After this adjustments, if the problem persist you will be Strong conclusion: 1) Transformer Faulty, 2) Speed SENSOR 3) Main Motor 4) PController Motor Board, Since PCB controls 90-95% functions of the treadmills. sincerely.