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MF 165 Clutch

J

Josh8906

Member
Hi, I have a MF 165 that keeps shearing the cotter pins that goes in the little dowels on the fingers on the pressure plate. This is the second clutch I had to put in because the first one done the same thing and a piece of the clutch finger broke when this happened. I have tried different cotter pins with a strong strength including steel ones and they still shear off after tractor is used some. Has anybody had this problem and knows of a way to fix it? Could these dowel pins be spot welded to hold them in place? Thanks for any help. A photo is included showing the dowel pins I am referring too.
<image src="http://forums.yesterdaystractors.com/photos/mvphoto9285.jpg"/>
 
I had that happen on my 65. I'm not sure what caused it. I put a whole new clutch assembly in it and it hasn't bothered again. I'm pretty sure I bought it from this site. Sorry I wasn't more help.
 
Only time I've seen those cotter pins shearing is when the pressure plate had cracks in it. When I unbolted the pressure plate from the flywheel it came apart in 3 pieces. I would look for cracks on the pressure plate, what else could be causing that to happen I don't know.
 
It's because the pins are in the wrong way. Cotter pins should be on the trailing end of the pin as the flywheel end of crankshaft turns counter clockwise. Picture shows the cotter pin is in the leading end of pin, which will wear the cotter pin quickly. All three pins should be the same way.
 
(quoted from post at 18:28:55 01/18/18) It's because the pins are in the wrong way. Cotter pins should be on the trailing end of the pin as the flywheel end of crankshaft turns counter clockwise. Picture shows the cotter pin is in the leading end of pin, which will wear the cotter pin quickly. All three pins should be the same way.
Click to expand...



That makes since.
 
Ok I see what you are saying about them being in wrong. All three are in that direction. On the previous clutch the pins were in the wrong direction as well. I can't believe the manufacture installed these the wrong way on both clutches. I don't think there would be a way to swap them through the access plate underneath because it is such a tight fit to get them out. I hate to pay again to have tractor split. Do you think it would be alright to spot weld them?
 
A good spot weld would be easiest way to hold the pins in place, and drive the next mechanic nuts on the next tear down. Release pin installation direction is important on ANY pressure plate assembly. Any rotational wear should be against the pin head, not the clip or cotter pin that retains it..
 
Hi, have never come across this as a 'problem'. Have had the occasional
one over 44 years. Have never seen any instruction to fit the pins to
remain in place with direction of rotation but it makes sense to fit
them that way and do that as a matter of course. Josh made mention of
'even fitted steel pins'. Does that suppose that aluminium one have
been fitted? The pin holes are small anyway and it is essential that
the largest steel pins possible are fitted.
Just done a quick calculation for a tractor running at a constant 1600
engine revs per minute the straight line speed for the pin and splitpin
combination is 61.8 miles per hour. Whilst it may not be a great speed
this is the force that the splitpin or pin head has pushing it against
the release arm link.
I could go further.
DavidP, South Wales
 
A better "picture" of how the pins should be installed is shown in the 175-180 I&T manual for the single stage split torque clutch pressure plate. No matter what pressure plate or tractor brand that's how the pins should be installed.
 
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