how to lubricate a treadmill lubricate a treadmill belt and you'll be amazed at how much it improves the performance of the machine you will need a treadmill and silicone spray step 1 stick your finger between the treadmills belt and it's deck and pull up on the belts to separate the two step 2 spray a generous amount of silicone spray between the belts and the treadmills deck shake the can before using it step 3 move to the other side of the treadmill and lubricate the other side remember to lubricate the belt every three to six months for maximum performance step 4 turn on the machine and let the belt run at a medium speed for two to three minutes now hop on and get your workout on did you know the first medical treadmill was used by a cardiologist named Robert Bruce in 1952