Trouble shooting when running on the treadmill the belt seems to stop

If you just run the belt with no one on it do you have this same problem or does it run fine? If it runs fine then you need a new walking belt. If it still shuts off then it may be your controller.

Go to the link and look up your model's trouble shooting guide.
https://www.smoothrepair.com/troubleshooting

see if you can remove the motor hood and look at the drive belt. it is a little belt from the motor to the front pulley to turn the walking belt. its either broke or fell off

call Treadmill Doctor at 800-750-4766 or try this trouble shooting guide

http://www.treadmilldoctor.com/Treadmill-Looses-power-when-I-setp-on-the-belt?utm_source=fixya&utm_medium=CPC&utm_campaign=Mendi

call Treadmill Doctor or take a look at this link. This will have all the trouble shooting areas you would need for a slugish belt.

http://www.treadmilldoctor.com/Treadmill-Belt-Bogs-Down?utm_source=fixya&utm_medium=cpc&utm_campaign=mendi

Dear Sir:
The problem is a worn treadmill belt and deck.
Most of the time not lubricating between the treadmill belt DECK vs deck. This causes friction and the surfaces wear putting greater stress on the electronics. The treadmill is shutting down to protect the electronics.

Try to RUN the software calibration for easy diagnose +trouble

See my personal TIPS for HELP

sincerely. God bless you.

ernesto cuadra
managua, nicaragua. c.a

Dear Sir:
I can read you trouble, and follow the next steps:
ALIGNING AND ADJUSTING THE RUNNING BELT
The correct alignment of the running belt is critical to the smooth operation of the treadmill. The belt is properly aligned at the factory. However, during shipping and handling or by use on an uneven surface, the belt may move off center and require a few simple adjustments. Before aligning the running belt, check its operation by following the procedure in Checking the Alignment of the Running Belt. If you determine that the belt needs alignment, follow the instructions here. CAUTION: Special care must be taken when aligning the running belt. Turn OFF the treadmill while adjusting or working near the rear roller. Remove any loose clothing and tie back your hair. Be very careful to keep your finger or any other object clear of the belt and rollers, especially in front of the roller and behind the deck. The treadmill will not stop immediately if an object becomes caught in the belt or rollers. Realigning the belt takes a few simple adjustments. If you are unsure about this procedure, call Precor Customer Support (see Obtaining Service.) Take the following steps to align the running belt on the treadmill. To ensure your safety, make all adjustments while the treadmill is OFF. 1. Make sure the treadmill is OFF and the running belt has completely stopped. 2. Locate the right belt adjustment bolt in the rear end cap of the treadmill. (To determine left and right, stand at the rear of the treadmill and face the display.) See Diagram 24. The direction you turn the bolt depends on how the belt is tracking. Make all belt adjustments on the right rear corner bolt using the hex key provided. • If the belt is off center to the RIGHT, turn the adjusting bolt ¼ turn clockwise, which moves the running belt to the left. • If the belt tracks off center to the LEFT, turn the bolt ¼ turn counterclockwise; this moves the belt to the right. Important: Do not turn the adjusting bolt more than ¼ turn at a time. Overtightening the bolt can damage the treadmill. 3. Turn the unit ON. 4. Stand beside the treadmill and press QUICKSTART. 5. If you are prompted for a password, press INCLINE ??¼, SPEED ??¼, SPEED ??². The running belt starts automatically after the 3-second countdown appears on the display. 6. Press the SPEED ??² key until the display shows a speed of 3 mph (5 kph). 7. Walk around to the rear of the unit and observe the running belt for a few minutes. The belt should run centered along the running bed. If the belt drifts off center, you will need to make adjustments. CAUTION: If you hear any chafing or the running belt appears to be getting damaged, stop the running belt immediately by pressing the red STOP button. Contact Precor Customer Support. 8. If the belt needs additional alignment, repeat steps 1 through 7 until the belt is properly aligned. 9. After aligning the belt, press the STOP button and RESET. Turn OFF the treadmill. Tighten any loose fasteners or other components on the equipment. If you hear unusual noises or you feel that the treadmill is in need of repair or service, contact Precor Customer Support. Refer to Obtaining Service.
Finally, check if the power cord is loose, connect it again. a) See if the breaker of Home is tripped? b) See if the breaker of the Treadmill is tripped. If do the Belt is very Tighted! loose a little. Try again.
Thank you in advance, if you need assistance, you can contact me, Blessing. sincerely.
E. CUADRA Managua, Nicaragua. C.A.

Don't know what size allen wrench you need but here are some resources for you:

Tutorial On Adjusting Treadbelt

Search for fitness servicers in your area

List of different versions of the Proform 530x, where you may be able to find an owner's manual, lube, a new treadbelt, or any other parts you may need.

Look under PROFORM J8 (29798)

To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns.