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Our 1755 ended up having engine troubles, not sure what as we never took it apart and it's still sitting. I think the hydro pump was starting to go out too, but not sure. It's ussually not a problem with these tractors. The 1850 deisels have the Perkins 354 6 cyl. deisel, later models of the same size engine were used in the White 2-85 (non turbo) and 2-105 (turbo). Massey also used these engines in some of their combines. The 310 in the early 1855's were the ones to give all others a bad name. The main reason for their troubles is the lack of oil capacity, and no oil cooler on the early models. They did use them on the earlier 1950-T's and on the 1955's of the same years. In the upgrades, they used a harder conecting rod bolt(the new ones were 12 pt. instead of 6), 1 pc. wrist pins, and on the later models they added the engine oil cooler. there ay be other small details I'm leaving out, others can correct me on this. The 1750, 55, and 1850 are all good tractors, as well as the 1855. The 19's are all right around or slightly above 100 hp. The over/under was offered on the later 50 series, so the 1850 may or may not have it. If not, it'll probably have the hydra-power, unless it has nothing which is uncommon. The hydra-power takes the 6 forward gears and 2 reverse, and multiplies them by 2, giving you a slightly slower speed in low which it free-wheels. The over/under also gives you one speed slower than normal, but it also give you one speed higher. I think someone said it's a 20% reduction/increase. Same 20% on the hydra-power. They basically do the same thing as the T/A, or the multi-power on the Massey's
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