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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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