You shouldn't smell propane at any time engine ideling, running under load or off. you have a leak somewhere. The most simple and quickest way I can describe the ampli-Torc is that there is a "clutch pack" that engages and disengages a planetary with an over-running clutch. I think your over running clutch is bad. I don't think it will hurt anything the way it is, it is just a nusance. This is a common problem with tractors that were used a lot with the torc in low with out a load. The low side was ment to gear the tractor down to increase pulling ability and ease of take off not as a seperate gear. The load on the torc dosen't hurt anything it's the no load that will get them because the tractor "free wheeles" then pulls then free wheeles then pulls then free wheeles you get the idea this causes the over-running clutch to wear out and fail prematurely. If you do fix it, check the driving plates their should be four. Replace them if they are worn or the tabs are starting to be worn off. They are part of what I called the "clutch pack" for lack of a better name. The lever on the left should be to ingage and dissingage the PTO if it is a tall lever that comes up to about the hight of the seat. I hope that helps. If you have anymore questions just ask.
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