If the belt is slipping at all it will get hot quickly. Try mowing with it for awhile and check the belt temp a few times. If its getting hot, check the belt for tension and also ensure that the blades spin freely in case you have a spindle bearing starting to fail. I'm not familiar with your particular mower but the belt will be tensioned either manually and needs to be tightened or it will be a spring loaded tensioner that might be at its limit due to belt stretch. If that's the case, you will need to replace the belt