Re: YT6700 transmission

Hopefully the last post on the Yamaha hydro. Repaired and installed. Running great, like new. It took some effort the get the flow passages recharged. After installation it was necessary to pull the tracter backwards without the engine running and without the by-pass engaged. It went about 6 feet before resistance was felt and the wheels finally locked up. Same thing in forward. After starting there was some groaning while air purged the system. Back on the road again. I believe there is a way to drain and purge the hydro without complete teardown. There are three flow valves that can be removed on the bottom side of the unit with an allen wrench. If those valves, small springs and ball bearings, are carefully removed the old oil will drain out, albiet slowly but it will happen. Flush the unit with kerosene several time and refill with oil until it drains out of the valve openings and then replace the valves. Some effort required but less than looking for parts and field engineering new internals.
Now to the gunky carbs which make it hard to start.
I will begin a new thread on those, with pictures if anyone is interested.