I've owned 2 MF-135's, bought and re-sold several more, and my father had a couple. I can't recall EVER hearing the hydraulic pump even a scant bit. I don't recall ever seeing the little buggers with a cab either.
The 135 Massey is the finest example of a small utility tractor ever made by anyone. If there's one to be had at a fair price, I'd opt for it over Chinese ANY day.
The PTO shutting down when warn alarms me though. With a 2-stage (dry) clutch, about the only explaination would be the PTO clutch failing. That requires splitting the tractor to fix. If the dealer does that, I'd say you have yourself a good one!
MF-135's sell here for a low of $3000 (for almost junk) to a high of $5000 (highest I've personally observed one selling for. Rumor has it that one sold at a dealer near here for $7500 last summer. Less than 1000 hrs. perfect condition)
Buy the Massey, keep it 10 years, and sell it for more than you paid. Buy the Chinese, keep it 10 years, spend more than the original purchase price on parts, work on it constantly, and then sell it for pennies on the dollar of what you originally paid. JMHO, and worth exactly what you paid for it..........