My only experience was when I had a contractor here on the farm with a New Holland TF46 combine that had driven over a Spring hole in an otherwise very dry field and was stuck with one drive wheel spinning. The contractor had joined together two 150 hp four wheel drive tractors with a chain and another chain to the combine. All eight wheels of the tractors were spinning plus the combine wheels.
The contractor asked me if I thought that "Daisy Etta" my 1956 Caterpillar D7 could pull it out. I told him I did not know as I had only recently bought it. It had a big blade on the front. We chained it up.
Pete, one of the old school tractor drivers with a pipe, said "Well if two " expletive" tractors could not pull it how to you think that "expletive" is going to do it?
Anyway sat on the old girl and gently pulled the clutch lever to introduce 14 litres of Cat's finest. Only 120 hp but massive torque at very low revs and all that traction with maybe nearly 20 tons of weight.
The engine only grunted, no track slip and the combine popped out like a champagne cork!
Pete's pipe dropped out of his mouth followed by another expletive!
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