I love when people tell me what I want to hear. 'cause usually when they tell me what I don't want to hear, it involves me going and buying something expensive afterwards. Like last winter, I broke the coupler in the driveshaft of the old girl, everybody told me it was the clutch. I didnt think it was because I still have hydraulics and PTO. so I spent $700 on a clutch, tractor still didnt move. FAIL.
Ferguson's & Massey Fergusons carried the marks of Harry Ferguson through the '80's. You'll see visual simularities to this day. The "mark" I was referring to is the utter simplicity that Ferguson tried to build into every tractor he sold. The 3-point hitch/draft control was the "brains" of the operation, and everything else was simple, basic, easy to work on, inexpensive, and reliable. You stop and think about it, that's a tough act to beat. Once you "learn yerself" on 'em, there's not much an average wrench spinner can't work on. And with a handful of tools at that. If you ever have the opportunity, grab a SERVICE MANUAL for your tractor. (They're all over feebay) Well explained, well illustrated, they're handier'n a 3rd hand.
Tested flow on a 35 is 3.5gpm. The 135/150 bumped up to 4.8gpm, while the bigger 165 was tested @ 4.5gpm Not a big number by todays standards. They still get the job done...I'm still scratching around trying to find the tested psi and the relief psi on each. Got it here somewhere.....
There's a plug on the LEFT side of the transmission, right next to the clutch pedal, near the top.... I've seen many a good loader and/or log splitter hyd. circuit that uses that plug as a return port. Looks kinda awkward, but it isn't really if things are plumbed neatly. I ran my first ever log splitter that way for years.
My 150 is 40 years old, about 3520hrs, give or take a few minutes, and still has the original clutch. I'm gonna have to give in and split it sooner or later, I know. A clutch shop near here will grind the flywheel, rebuild the clutch, and even toss in a pilot tool for right at $300. I split the tractor, R&R the clutch/flywheel, then re-assemble. My son and I have done a few 135's, and can average under 10 man hours if we REALLY get after it. Gonna go that route most likely.