I had a similar issue when I first got my 2182. It drove me crazy until I started researching things. It is a low hour machine so I knew it wasn't electrical. There were two issues I found. The main issue was the battery. If you have a bad battery, your pto will constantly disengage. That solved my problem. However, since I was new to the 2182 I didn't realize there was a safety switch in the dash that EVERY time you would put it in reverse the pto would shut off. Very annoying. I fixed that problem quickly. Not sure if the older SGT's had this safety switch, but if not, either charge your battery or buy a new one. Invest in the stronger one with higher CCAs. If you had no prior issues and you haven't replaced your battery in a while I would try this route first. After fixing these two issues I have not had any more issues with the pto shutting off unless I hit a bump and my A** lifts off the seat and the pto shuts off.
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