The engine rpm should drop when the lever is pulled back. The throttle plate has notches to hold the throttle in a given position. Several things could have happened. On one of mine the tooth on the throttle handle was worn down. We welded a small bead on the tooth and then I filed it down to a sharp point. Another thing could be that the grooves in the stationary part of the throttle plate have been round over through years of wear. It is also possible that the bolt holding the throttle lever is not tight enough. There is a spring in there and this may be allowing the throttle to drop back to the idle postion. O.E.M. Tractor parts has the entire throttle assembly for $68.00 or the throttle handle for $32.00. You could probably also get through your CASE/IH dealer.
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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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