Normally I help others, but today I need some help. I have an Eaton 1100 drive system that has me totaling confused. The tractor will not drive for the first 20 minutes of operation. After 20 minutes it's like you flip a switch and everything works. Changed the fluid, filter, and belt. Have checked fluid levels many times and everything's good. Anyone got any ideas as to what to try. This is a friends unit that I have been trying to solve for the last 6 weeks, so I don't get to work on it every day. Thanks Rivets.