I suggest that the servo is getting stuck in the engaged position because:
1) Electrically, turning off the switch should have disengaged it. Failure to disengage at that point would tend to indicte that it is NOT an electrical problem, and point towards a mechanical problem.
2) Hitting the brake SHOULD dump the vacuum to the servo. The servo is operated by a vacuum diaphragm much similar to your power brake booster. Dumping the vacuum should cause it to immediately release the throttle. There is a vacuum dump switch on the brake linkage that you should be able to check out.
These two items pretty much rule out a vacuum or electrical problem. My vote is to replace the servo. Also check for any binding or restriction in the linkages. Overall, I would say that with 99% certainty, your problem is mechanical, and the prime suspect is the servo.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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