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MF 175 pto update

R

RandyB(MI)

Well-known Member
Original post was pto doesn't stop. Today I put lever in off position ( this has "independent PTO) started tractor and at slow idle slapped pipe wrench on shaft and it stopped. No different sound or rpm change. Once stopped, it didn't even "load" the pipe wrench and was easy to slip wrench off then. Took wrench off and shaft stayed stopped even when revved to 1500. I even tapped shaft with wrench and still stayed still. Shut tractor off and restarted and still stayed still. Put lever in engaged position and shaft turns. Lever back to "off" and doesn't stop....until you throw wrench back on. Then it stays still even without wrench. Could this just be a case of needing used? When turning by hand, there are no tight/loose spots. Why would the brake work once you manually stop it but not when going from power on to power off?
 
Never worked on a MF independent pto, but it looks like pto brake can't be adjusted. The friction disk for the pto may need to replaced since it can't stop the pto shaft from turning when you turn the pto off. The brake has a little left to hold the pto shaft from turning if you stop the shaft manually. The piston that works the pto brake may have a place where it sticks that keeping it from applying enough pressure to stop the pto shaft from turning when you cut the pto off by the lever.
 
Mine has been like that since I've got it. PTO brake is weak. I just shut the tractor off to hook up implements. It doesn't turn with something hooked to it. I'm not going to tear it apart just for that. When something like the hydraulic pump quits I will fix it then. It can be a little inconvenient but I usually leave it hitched to the baler or haybine all summer anyhow.
 
The tractors I've repaired that act like that USUALLY have burned/warped clutch pack discs and separator plates that cause enough drag the small hydraulic brake can't stop the rotating drum. The brake will work correctly ONLY on tractors with good straight internal parts.
 
Thanks all. PT farmer, kinda my thoughts too on the fault. As long as it will stop when hooked to an implement (which it does) I will also probably not take top off at this time to repair. Doesn't look like it would be that involved a job to do it tho. Thanks again.
 
My 675 was always like that, ran it for 15 years and it never got any worse. Stop the engine to hitch up a powered implement (which you are supposed to do anyway!!), be aware that something light like a haybob may well 'twitch' a bit when you start the engine, and use a cover on the shaft when not using the PTO. Incidentally, once the tractor was fully warmed up the problem went away anyway. I doubt if it's worth splitting the tractor to cure it, IMHO of course!!
All the best, Jim
 
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