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More then likely you just have some air in the system. Jack up the drive wheels off the ground and then start your engine."Drive" your mower in forward for about 5 minutes and then reversefor 5 minutes. Shut the engine down and check the level of your fluid. If thefluid appears frothy then let it sit for about 20 minutes so the air can escapefrom it. Repeat this 3 or 4 times until the wheel in question drives at thesame speed as the good wheel.
I ran the machine for about 30 minutes. It worked well and then
it started to slow down to the point that is not moving.