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77 PTO shaft

C

chucksoliver77

Well-known Member
Sort of related to the topic below. How in the heck does one break the pto drive shaft? My 77 has been making about 90hp for the past 20+ years and has done a lot of brush hogging, post hole digging, manure spreading with a big tank spreader and lots of other pto work with no breakage. I even had a 129 hp 310 in it for 5 years that smoked the pto clutch while on the dyno. Maybe his tractor does not have a pto support causing the shaft to wobble. In 64 years we have never broke one. Just thinking out loud, Chuck
 
Was helping landlord harvest wheat in 1953, 77 diesel on PTO powered combine, the shaft was fatigued just behind the splines that engage the adaptor in the flywheel. Looked like a splintered piece of wood, cracks parallel to the shaft, when we removed the pieces. Worked for an Oliver dealer, and then the Company until 1985 and this is the only other one I ever heard of. John S. may have heard of some as he was closer to the field than I was.
 
It was the apparent 'overheating' that worried me. It would have
to get very hot to knock out the temper in that shaft. No doubt
other parts might also be affected by that amount of heat. Only
one way to generate heat in a shaft like that I would think -
friction. Fretting, chattering, rubbing?

RAB
 
Chuck How many RPM's are you turning to get the 90 Horse power? Remember if RPM goes up the torque load on the shaft is reduced.
 
John, When I work it I never go over 2000, when I pull it I rev it to 4000, but I remove the shaft for pulling. We never saw 90 on the dyno,I never tested it after I did the last mods.but it ran the big barrel spreader better than the 1755 which is at least 85 horses.Chuck
 
I know a guy who had an 88 built up to the hilt. He tried to dyno that one a couple of times. He said the shaft broke at about 100 horse both times.
 
rrlund i really liked the right up in the oliver mag. about you.I have a 880 puller that was ran on m+w dyon last summer, it made 160hp at 2750 engine rpm.Had no problem with the pto shaft.
 
my brother twisted a 77 pto shaft 4-5 years ago, governor started galloping when running silage blower, that blower impeller was like a big flywheel when it started to gallop, twisted off by splines, had to re adjust the governor linkage to get it to stop, 2 years ago I overhauled the motor and new bushing in governor, tighten up linkage joints, made a big difference...
 
(quoted from post at 16:01:50 03/20/15) Was helping landlord harvest wheat in 1953, 77 diesel on PTO powered combine, the shaft was fatigued just behind the splines that engage the adaptor in the flywheel. Looked like a splintered piece of wood, cracks parallel to the shaft, when we removed the pieces. Worked for an Oliver dealer, and then the Company until 1985 and this is the only other one I ever heard of. John S. may have heard of some as he was closer to the field than I was.
Click to expand...

Sounds like this shaft crystallized.
 
Chuck: You need to remember the dealer I worked sold a lot of equipment. There were probably a 150 model 88 Super 88 and 88 tractors we serviced and probably 100 of the 77 series. So at that time if the PTO broke the owner was busy pulling some kind of harvest equipment and I know the dealer down the road stocked them as well.
 
John now that you mention it I can remember turning too sharp with the PTO engaged causing it to rattle a lot, always disengaged it when that happened, also I loaned mine to a friend to blow silage with it and he would give it full throttle and engage it instead of putting in gear and then giving it throttle. I'm sure if he kept doing that he probably could have broke the shaft or fried the clutches. I'm sure many have been broken by people not knowing how to use them and some form fatigue, but we have never broke one in this tractor. Chuck
 
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