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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF 175 clutch

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Trainsernie

08-18-2006 21:35:08




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The clutch on my 175 disengages and engages at the very top of the pedal travel. At the same time, pushing the clutch pedal to the very bottom does not disengage the pto clutch enough to allow the pto to be engaged - I have to turn the motor off, engage the pto, and then start the tractor again with the pto active.
Is this a sign of a worn clutch, or does it simply need adjustment?




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Big Dean

08-20-2006 05:20:33




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 Re: MF 175 clutch in reply to Trainsernie, 08-18-2006 21:35:08  
The special gauge used to set the pto clutch stop bolts is 0.090 + or - 0.002 this works well when everything is new but after the pins and links get worn that will be to much clearance. I always use a feeler gauge and set them at 0.060 that usually works real well.



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DavidP, South Wales

08-19-2006 07:27:47




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 Re: MF 175 clutch in reply to Trainsernie, 08-18-2006 21:35:08  
Hello,
Adjustment is the first step. It's a bit of a fiddly job and can be a bit dirty. Remove the belly plate and wipe around the hole with a cloth. Use a torch and you will see 3 adjusters equally spaced around the clutch housing. I'm guessing the the clearance on top of the head of the adjusters will be something in the region of 1/8" or 3mm. You will need two 1/2" AF spanners. Make sure they are in good condition. Slacken the locknut slightly until you can just turn the bolt with the other spanner. Unscrew the bolt to obtain the required clearance of approximately 1/16". You will need a gauge of some sort which is approximately 1/16. An idea of the thickness you need would be two 12" hand hacksaw blades together but with the teeth ground off. The clearance is not an exact figure, what is more important is that the adjustments are the same.
When this is done you will find that the 'second stage comes in very much sooner. Check the amount of wear in the pivot bushes for the pedal, the connecting rod yokes and the lever on the clutch shaft. You may loose movement at any of these. If all is in order, carry out your final adjustment by slackening the bolt at the clutch shaft lever. Insert a screwdriver or similar into the hole in the shaft and adjust to give a clearance of 3/8" at the point where it contacts the gearbox casing. It is not uncommon to end up with an uncomfortably high clutch pedal. You can lengthen the rod to a point where the PTO dis-engagement begins to suffer. The PTO shaft should stop turning on its own with the pedal 1 1/2" minimum from the end of its travel.
Good luck.
DavidP

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Don-Wi

08-18-2006 23:06:03




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 Re: MF 175 clutch in reply to Trainsernie, 08-18-2006 21:35:08  
It could be a sign of either. Sounds like you'll have to open up the inspection plate under the clutch and try to adjust in there. I've never done it myself so I can't say what it all entails, but it's been discussed before. An owner's manual is always a good investment, I ogt one for our 165 off Ebay, as well as a few other manuals and such.

Donovan from Wisconsin



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richard in nz

08-19-2006 17:24:33




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 Re: MF 175 clutch in reply to Don-Wi, 08-18-2006 23:06:03  
Ther is a proper guage for setting that clearence, but we used to use the starter key,one with every tractor!



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