Quote:
Originally Posted by cooperino
Tunnel cover is off. I have moved lever with engine off. I can do it with it running but that won't change how the linkage moves. The two plates move independently and neither show any sign of heavy wear or being excessively tight or loose. Jon, I will put it this way. What i did to try to control it is this.. I left the unit at idle, then i moved the lever to forward slowly as far as it would go. I had better control of speed by using throttle to make go faster than the hydro lever. By time I got to full throttle I was well over the top speed of any GT I have ever owned. Top speed to the point that I could only do this on flat pavement to maintain control of the tractor.. Way faster than I feel this tractor should really go. Is it possible that the charge pump relief is broken internally and wide open?
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You may be over thinking this issue! Is the hydrostat lever on the dash very easy to move? It usually is loose on these old tractors. There are two style of control linkage. One is easy to adjust...the other needs new parts. If the linkage is loose it can can cause the the speed to be eratic. If you find that as the tractor is moving and it speeds up by itself when you let go of the handle...it is not possessed but the linkage is loose and needs attention.
