Update:
So I changed the transmission fluid and filter today and noticed the fluid was very dark. Once I was done that, I noticed when going up steep hills I heard a loud chatter. I messed around and found one of the four bolts holding the pump onto the transaxle was coming out nearly a half an inch. Once I tighten this, the chattering went away. Now, I noticed the brake disc is thin and loose (tractor barely stops with brake pedal pressed) and will have to replace it tomorrow. The one thing that is perplexing me is when the bypass valve is pulled (for transport) I can still get on the tractor and press the forward and reverse pedals, and the tractor moves. It never used to do this. I can't understand/see how the bypass valve does anything. Any suggestions?
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