Our ten acre of forest are quite dense and even with our tiny B5100, it can be difficult to get the logs out. I found the most time efficient means of handling trees was to cut them in 12'-20' lengths and drag the logs clear of the trees in low gear with a chain attached to a 10K ring bolted to the frame from the front, or onto the 3 point hitch adapter in the rear. If I set up the chain as a choker, I don't have any problems with it coming loose. Occasionally the end hits a rock or stump and I use a peavey to roll the log out of the way of the obstruction.
Once clear of the woods and safe from sudden stops, I can drag the logs in higher gears - 3-4 mph or so, so it doesn't take long. When I get the logs to the log pile, I mark them off in 4' lengths with the chain saw, and then lift them from one end using log tongs clipped to the chain so I can cut them from underneath, obviously starting at the end furthest from the tractor.
The only problem with this I need to sharpen the saw chain frequently as there's dirt and bits of rock in the bark. I also need to fell them in the right direction; this is harder with windfall
.
If I'm planning to mill the logs, I'll use the log arch I built to keep the logs clear of debris as much as possible. Usually this is cedar and quite soft, so treating the logs gently is important.
Logging is hard work, even w/ the tractor & chainsaw. I can manage about 2-3 80' trees a day w/o too much pain this way, depending on how tight the conditions are and thus how short I need to cut the logs.
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