Larry S

I have a mule 550 and when it gets hot it will not pull a hill. I have rebuilt the driven clutch ( new clutch spring, new pads, new ramp), new drive belt and nothing has helped. It will drive great and pull Hills fine until the mule gets hot, then it just slips and won't go. I rebuilt the driven clutch based on what a kawasaki tech told me when I described symptoms. Any ideas? Is it the front clutch?