Does moving one of these (say the PTO lever) cause the diff lock lever to move and vice versa? Mine seem to sorta go together which doesn't seem quite right.
I don't see how the difflock and PTO shifters could be related. But the transmission internals are pretty compact, maybe one shaft runs through another hollow one or something.
Hoye has better parts diagrams for YM2000 than YM240. Take a look at this one:
Yanmar Tractor Parts: TRANSMISSION_INTERNAL
The difflock is a strange design. Step on the lever and the rollpin climbs the slope up out of a V, forcing the shift fork to move toward the right side of the tractor. The fork moves a gear to the right so it engages face to face with a similar gear.
Per that parts diagram I don't see the pto shift lever coming in from the left, or its shifter fork.
Added: they are on the
Shift Levers page.
Comparing those two diagrams, maybe the two shafts meet at the middle.
I don't see any sign of discouragement, or reason for such. From what I've seen ALL the US Yanmars look thrashed like this after going through several owners. But the fundamental quality and simplicity of repair is such that minor reconditioning will put them in good shape again. Heck the prior owners obviously kept running them long past the need for maintenance became obvious, this didn't seem to hurt anything expensive.
My YM240 looked about the same, a bashed headlight, stuck brake, dash warning lights dangling down by my knee. Worst problem was hard starting but I'm pretty sure why - The seller had an old rusty farm diesel tank at his 'farm' which had been subdivided from real farm into suburban acre horsey places. The fuel in the tractor burned my eyes so bad it must have been pre-1996 high sulphur diesel, it might have been fermenting in that farm tank for 20 years. It didn't occur to the seller that bad fuel was his cause for hard starting, in fact he had burned up a starter and put a bogus local handyman 'rebuilt' starter on it. Finishing that ancient fuel and starting a tank of fresh diesel made a night to day difference in starting and fumes. I later bought a $100 Ebay starter and the thing cranks furiously, starts instantly now.
I didn't buy any serious problems, just nuisance stuff that doing proper maintenance resolved. Yours sounds about the same.
The loader cylinder issues are to be expected on something that old. I've repacked 2 of 4 cylinders and replaced half my hoses, just normal maintenance on 35 year old hydraulics. I don't see anything about your rig to be concerned about, it was priced to reflect that it needs several hundred $ of restoration before putting it into troublefree service. Still cheaper and better quality compared to what's out there near-new.
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