Posted by used red MN on October 20, 2023 at 13:03:12 from (68.46.31.28):
In Reply to: IH 300u problems posted by tarment10 on October 20, 2023 at 12:26:24:
First off DO NOT just start randomly disassembling your engine looking for a smoking gun! For the most part a machine has to be in running order to diagnose a problem it is having while running. Grab the distributor base and see if you can turn it fairly easily by hand. If so something probably came up against it and turned it putting the ignition out of time. If that has happened start it up and turn it one way or the other until you get it sounding more like it did before. If that makes it better you will need to reset the ignition timing. Someone can come back and cover that process if needed. Secondly, does the bush hog utilize the hydraulics to raise and lower it? If so have you used the hydraulics on this tractor before for some other purpose? Whether or not you did you may have you inadvertently moved a hydraulic lever off of the centered position? The levers have 3 positions. A center where it normally sets when no hydraulic function is required and an activation position on either side of that. If it has been moved to one of the activation positions this can load the engine. Normally the lever should return to center itself, but in this case the linkage may be stiff or the valve has a problem. Place your hand near be do not touch the hydraulic lines that run up on the distributor side of the engine are they real hot? If so the lever maybe out of place or there is some sort of malfunction in the hydraulics. Although the hydraulics themselves would not keep the engine from revving up.
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