mower drive slows down when hot

[renda454]

Can anyone tell me why my right side drive on my great dane gets very slow after I mow for about an hour. I changed oil and filter and it didn't help

[CamLand]

Can you give us some info on what kind of machine, i.e. engine,age .any info will hopefully help in fixing your machine...

[renda454]

the mower is a great dane 61 in. chariot with a 25 hp kaw. engine

[xcopterdoc]

Dragging brake or internal seal leakage on the drive motor.