I am not familiar with Allis tractors - a few years back I bought my FIL D17 Series IV and its been pretty good.
A couple counties over a guy has an Allis 7000 from 1976 - seems like it would be the right size for what we need - basically a tractor big enough to run a 6' big round baler and handle a loader that moves the same bales around. The current owner hasn't had it long. He bought it from a widow woman whose husband had owned it since new or near new. The tractor sat for 10 years after the original owner died when the current owner bought it. He replaced the hydraulic pump, alternator, starter, new batteries and had the power steering cylinder rebuilt. PTO works like it should and claims to have replaced all the filters and fluids (except coolant). He says the power shift works good and the brakes are good. According to him about the only thing that doesn't work is the air conditioner.
He says it has about 7000 hours on it. How good/bad are these? I grew up running IH 560, 656, 886, 1466, 1486, 1586 tractors and I currently have 706 to run our baler - it can just barely do the job with the 282 diesel. My understanding is the 7000 has a 3 speed power director similar to the 2 speed power director on our D17 the difference of course being that it power shifts between Low, Direct, and High, where as the D17 has Low and High to power shift between.
How reliable is the 3 speed power director with a 100 HP tractor? This would have the older style transmisson. Does this have a true independent PTO or does it stop if you press the clutch in making it necessary to use the power director to engage neutral to keep the PTO running?
It looks like a decent honest old tractor - it farmed the same quarter its entire life before the original owner died.