Treadmills are some of the best workout machines that can be used when you are trying to lose weight. These machines are expensive – which is why you need to do what you can to make sure that nothing ever happens to them. When they are broken you can hire someone to fix it or you can figure out how to fix it yourself.
The first thing you want to check is the electrical supply. You need to make sure that the treadmill is getting the proper electricity from the outlet that it is plugged into. If this is not the problem than you are going to have to turn the power supply off in order to figure out what else you need to do to repair it.
Clean down the unit to remove any dirt that might cause friction to build underneath the belt. When this happens the belt will become stiff and not able to operate properly. When the unit has been cleaned you can turn the electrical power back on to see if it is working again.
Turn the power back off to it and look closely at the speed sensor to judge the amount of dust and dirt that has built up inside of it. When you clean these sensors off you should be able to keep the machine from jerking around.
Over the years that you have used the machine you have worn the belt down. Follow the instruction manual to find out how to replace it. You should be able to purchase a new belt from the manufacturer that made the treadmill. Make sure that you adjust the belt if you smell something that means it could be burning.
If nothing else has helped than you should change out the motor. You will have to purchase one from the manufacturer and follow the instructions to make sure it is replaced properly.