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In Reply to: B3030 HST Lurching posted by Gary W. Sutphin on Saturday, October 17, 2009:
The factory rep is lying to your dealer. There is no hydraulic valve to suddenly open up. The HTS pedal controls the angle of a wobble pump. When the wobble plate is flat, it pumps very little fluid at a high pressure and you move slowly with a lot of torque. As you depress the pedal, the plate angle opens up. If the HST is lurching, there is a loose connection to the wobble plate. Lurching is not normal. It represents an unsafe condition. I certainly wouldn't want to work around a tractor that suddenly lurched forward or back. You didn't say, but does it do the same thing in reverse?
Raise holy hell until this is fixed. Even if it doesn't kill someone, it's going to eventually break.
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