I have a proform treadmill that slips as soon as i step on track i looked at the belt it looks good how do i tighten up the track

there are two bolts on the rear of treadmill walking deck. these are adjustment bolts. start with the belt going 3mph. tighten the side where the belt is closest.only go 1/4 turn at a time.give it 15-20 seconds for belt to track or move over. continue until centered.

If the treadmill belt continues to slip even after you have adjusted the rear roller bolts, then it is time to replace the running belt. These belts do stretch over time and must be replaced when they stretch to the point that it can no longer be tightened enough to not slip.
https://www.sportsmith.com/walking-belt/product/31332

there should be two screws one on each side of the belt in the back of the treadmill (you may need to remove the side rails (theres one on each side of the belt) to see them) those screws will tighten the belt. note: you must be carfull that the belt is tightened evenly. livestrong.com is a great website if you need help wih this. good luck!

Unplug unit then remove motor shroud the walk on the belt normally and try to stall the belt to make it slip. Be careful during this test. If the problem is in the drive belt, either the drive belt will stop when stalled or the front roller will stop when stalled.
Find the set bolt(s) on the motor. This is typically run through only one side of the motor mount or may be on both sides but it does not run the full length of the mounting..
Look for a bolt that will tension the motor. If it has this bolt, it typically runs in the same direction parallel with the drive and walking belts. If your treadmill is not equipped with a bolt as described above, the drive belt must be tensioned by hand. While one person applied increased tension to the drive belt, the other person should tighten the motor set bolt(s) that are described in Step If your treadmill is equipped with this bolt (very few are) the repair will only require one person.
If the motor, drive belt, and front roller continue to turn when the walking belt is stalled, the problem is with the walking belt slipping on the front roller.
If the walking belt slips when walked on. Using the allen wrench, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each side of the walking belt 3 to 4 inches off the walking platform. Be careful to keep the walking belt centered. Plug in the power cord, insert the key and carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

Look under PROFORM J8 (29798)

There should be an allen head bolt on each side at the rear of the treadmill going throughthe rear cover into the tail [rear] roller. Turn each one 1/4 turn at a time equally untill slipping is stopped. If belt tracks more to one side tighten slightly more on that side.

look for a tension knob it will tighten the belt unless the belt is really wore out and may need replaced

You can get the manual on linke below. When there type in the number code then hit submit. on the next screen click on manual link to down load. then on page 21 tells you how to adjust belt.

http://www.hammerwall.com/Download_Manual/18209/

please look under the bottom of the treadmill and be sure that your alignment brackets are not benmt/missing. (put the machine in the storage position and look about 2/3 way down the side of the belt) you should see a metal bracket on each side pressing in on the belt. They should be pressing in about 1 1/2 -2 inches to help track the belt.

Sounds like the motor drive belt is slipping,remove the motor cover,be careful some models have hidden screws in recessed areas underneath if you remove the correct ones the hood comes off easily. There is a bracket that has a bolt to adjust the motor belt tension.Also if you tightened the walk belt up it may be too tight which could cause it to wear or tear easier,the rule of thumb is tighten the walk belt just tight enough so it doesn't slip.