Replace the saw blade with a new one if you notice excessive vibration from the saw while you work.
Obtain a gum-removal solution and apply it to the threads of the elevating hand wheel if it is hard to turn. Sawdust sometimes gets stuck in the threads.
Feed your work through the table saw more slowly if it overheats during use. Sweep or vacuum away any sawdust that has accumulated around the motor or saw blade.
Unplug some tools or appliances so the circuit isn't overloaded if the saw isn't reaching full power. Change the fuse of reset the circuit breaker if you think that is the problem.
Check the voltage with a portable voltage tester or phone your power company to come and test it to ensure the saw is within the proper limits if the motor continually starts slowly or has trouble reaching full speed.