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MF-35 --- PTO struggling

P

Pete in Holland MI

Member
My friend recently purchased a MF-35 tractor and has started restoration of the tractor. We recently were at a tractor show
with a Prony brake that would accept a PTO shaft. During the test, the tractor got up to about 2/3's of its rated horse power,
when the Prony started receiving less power from the tractor. The more throttle was given, the less input to the Prony was
given. Drop the throttle back, and it seemed to regain normal power transfer. It sounded like a slipping clutch. He has
an Operators and Service manual on order. In the mean time:

1) Is there a secondary clutch for the PTO?
2) Is it adjustable?
3) How would we know if it has a 1 or 2 clutch system?

Tractor drives nicely, but hasn't been put under a full pulling load yet.

Thanx for your assistance !

Pete
 
Most MF 35s were Deluxe models with the two stage clutch, first pedal stage for the transmission, second stage to start/stop/PTO shifting. Deluxe models also had full dash instrumentation, oil, water, and tach gauges. If it's a Special those used the single stage clutch like the Ferguson TO 20 and 30 had, and no tach gauge. Sounds like the PTO clutch is slipping, may be getting oil on the disc facing. Only adjustment is release settings, clutch is spring loaded so no way to tighten it up if it's slipping. Have a 135 diesel that the PTO slips on too, planning on splitting it this winter to repair the oil leak that's getting on the disc, and dripping out the cotter pin hole under the transmission front.
 
I think you can remove dust cover underneath and adjust the clutch with an adjustment bolt with a locknut (three or four of them), and adjust them all the same. Use a big pry bar or take coil oose and bump starter to turn motor to get to all of them. You might get a little more running out of it by adjusting them. I did on a 135.
 



2364.jpg


Try adjusting the clutch it can't hurt and is relatively easy to do .
Use two thicknesses of hacksaw as a feeler gauge to set the right gap . Be careful of the adjuster bolt heads they are soft and burr over easily , use a good ring spanner if you can and mark each one with chalk once done .
 
(quoted from post at 05:36:00 08/22/17) The PTO adjustment screws will help if the PTO is not RELEASING. Will NOT help if the disc is slipping under load..
Click to expand...



I'll bet that when the bottom cover comes off there will be a very nasty smell, and a bit of stuff fall out the bottom.
 
I respectfully disagree, because it did help on mine by making adjustments on those bolts. I will concede that this issue does sound a little different from what I was experiencing, and maybe I'm misunderstanding the situation, but adjusting those bolts stopped the slippage, and allowed me to keep from breaking the tractor in half to fix it. I think I'd at least try it before breaking it down.
 
I don't see how adjusting the bolts would TIGHTEN the clutch pressure. That's fixed in place by the PTO pressure plate BELLVILLE spring. The three bolt heads push the PTO pressure plate AWAY from the disc to release it. Over time as the main disc wears is when resetting the bolts to .080 will restore the release action. I have two 135s, one US and one UK models. Both need the split this winter to repair the trans oil leak that's causing both to have slipping PTO clutches.
 
(quoted from post at 10:14:15 08/23/17) I respectfully disagree, because it did help on mine by making adjustments on those bolts. I will concede that this issue does sound a little different from what I was experiencing, and maybe I'm misunderstanding the situation, but adjusting those bolts stopped the slippage, and allowed me to keep from breaking the tractor in half to fix it. I think I'd at least try it before breaking it down.
Click to expand...



Did you have to adjust it to give it clearance? If it has too much clearance pto clutch won't disengage.
 
If the travel of the pedal has fouled up by the tractor setting, it may be keeping pressure on it, sounded to me like it's sit a long time. Maybe things aren't moving like they should. I'd sacrifice 30 mins for a chance rather than go in guns a blazing. But you dealership guys always cost us poor farmers a lot of money by going chips all in right off the rip. Again it worked on mine, 30 mins, what's the loss? You being right? You probably are, but that thing sitting for a long time changes my thought process. Lastly, I'll say this... run some equipment before you throw in the towel as well. Those dyno machines really can put it under unusual stress conditions.
 
One more point I forgot to make is that I've seen so many of these 35s 135s where people have messed with that foot petal trying to get more clutch that they mess up the travel of the clutch.
 
Yup, seen that mistake made a lot too. One thing that helps to keep the clutch pedal a bit lower is to set the three PTO release screws to .060 inch so the main pressure plate will pick up/release the PTO disc earlier than the .080 inch setting does..
 
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