Most of the tow release levers I've seen will hook in a slot in the frame to release the drive, and spring to the drive position when released. It operates a bypass valve inside the hydro unit.
That you were able to push it without sliding the wheels says the brake is released and the tow valve is open. With the tow valve closed, it should lock the rear wheels.
Tying to drive it with the tow valve open will only cause there to be no movement forward or reverse, as if in neutral.
Are you saying when you have the motor running, then move the drive lever forward or backward, the engine is loaded down and killed? And the tractor does not move? But with the wheels off the ground they turn without loading the engine? If so, that sounds like a mechanical failure inside the hydro unit, a failed bearing, failed pump or hyd motor. If there is a drain plug, might drain some oil in a clean glass, look for metal.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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