Question about Proform Sport 1000 Folding Treadmill PFTL91205 - !

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Pro Form Treadmill 625 EX Wide Trac

When we program the mph's we are unable to set the desired mph, the speed either increases or decreased and will not stay set.

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  • John Mazmanian
    John Mazmanian May 15, 2010

    Is the speed variation significant and is it a gradual increase or decrease

  • hredmond May 16, 2010

    You can set it for 3.5 and it will go to 4.5, show 4.5, then all of a sudden it will go to 2.7 and keeps changing. Both the actual treadmill and the electronic display keep changing.

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  • Proform Master
  • 832 Answers

1. You may have a worn belt and deck problem ( #1 problem on treadmills ). Test by the following procedure:
a) without the power on stand on the walking belt
b) push the belt in the direction it normally turns
c) if the belt is very difficult to turn (on most treadmill) this means that you have high belt/deck friction.

You must physically inspect the belt and deck. The deck should be smooth. The belt should have a consistent feel from side to side (a belt can be worn out without any sensory signs of a problem). If you feel deep grooves in the deck or uneven wear on the underside of the belt, part replacement is necessary. Continued use of your treadmill may damage expensive electrical components. If their is no signs of excessive wear then the next step is to lubricate the deck follow this procedure:

Before applying lubricant, the belt must have the tension reduced and cleaned deck. Loosen the tension roller by following the instructions in your owner’s manual. Do not loosen the bolts in the tension roller too far or the bolts will come out of the roller shaft. This step may not be necessary for your treadmill model or belt and deck condition.
Contaminants are the worst enemy of your belt and deck. Some treadmills may have an excessive accumulation of dirt and contaminants. If these are trapped during the belt lube process, significant damage will occur. Lift the belt and slide a moist towel between belt and deck, slide the towel the length of the unit to catch the contaminants do this a number of times inspect towel and need be use a fresh towel and repeat cleaning let dry then apply the lube in the center upper third of deck then start unit and walk on it @ 1-2mph for about 5 min. You may purchase the lube from National Gym Supply @ gympart.com Part# TM001 or call them @ 1-800-496-7278 their on the west coast. At this point I believe your problem should be resolved if the above procedures have taken care of problem take a look at the next step, as mentioned the #1 cause of treadmill failure is lack of maintenance of the belt and deck.

On occasion, you may have already damaged the DC board if you have high belt/deck friction. If the belt walks freely, you have a different problem.

2. If it passes the belt/deck checks, you may have a DC board output problem. If the belt tests ok and you have a speed variation, try this test:

  1. Set the speed to 2.5 MPH. Let the treadmill run without anyone on the belt. Check to see if the speed is constant or if there is a variation.
  2. If there is no variation, step on the belt. If the speed slows down or speeds up, you may have an output problem on the DC board. This is the board that connects directly to the motor. Check the speed sensor if it is a magnetic sensor unit ( Under motor shroud usually attached on the left hand side of frame with 1/8' clearance between sensor and front roller pulley) you can test continuity with a multi meter or replace with a new part to test. Many times passing a kitchen magnet in front of the signal will make a speed display on the console if the magnetic sensor is good.

Posted on May 16, 2010

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