Dryer over heating

hoe do i open my amana heavy duty dryer to get to the belt?

It sounds like the motor is tripping out on the thermal protector.

I would start by taking the dryer apart and cleaning all of the lint out, Make sure to clean the venting.

while you have it apart look at the seals and see how worn they are.

How old is the dryer? How long is the venting? is the weather hood outside blocked?

Let me know if you have any more questions.