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Just finished the rebuild of my 990 and took it for the initial test drive. Since all of the linkages where completely disassembled for paint / repair, I know everything is off. I have to hold the hydro lever all the way fowards to move, if I let go of it, the tractor stops. Currently to get reverse, If I push the brake pedal all the way down, the tractor will go backwards. Which adjustment do I need to start with to get closer?
 

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The tapered shaft on the bottom of the hydrostat needs to be able to turn an equal number of degrees in both directions for proper forward/reverse. There's a partially threaded rod connected to a cast piece that fits onto that tapered shaft on the hydrostat; by adjusting the nuts on the forward end of that rod you'll get the proper amount of back/forward movement.

Not very easy to explain but it should make sense if you stick your head under the tractor and watch how things move when the forward/reverse is adjusted.
 
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