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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Quick Q Regarding Lift Control Spring

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Aaron Ford

12-14-2006 22:36:58




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Hello All,

I was going to replace the lift cover dust boot on my MF65, and my local dealer said that most folk do not replace them because it is impossible to get the big nut off. I did not follow him, but agreed anyway. How hard is this boot to replace or can it be done by splitting the boot and gluing it back together CV joint style? I have already replaced the lift cover, but can pull it if necessary. Thanks in Advance.

Let's go Mountaineers,

Aaron

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DavidP, South Wales

12-15-2006 02:55:29




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 Re: Quick Q Regarding Lift Control Spring in reply to Aaron Ford, 12-14-2006 22:36:58  
Hi Aaron,
Replacing the rubber boot is straightforward, now you know there's a big 'but' coming.
You don't mention the model of your tractor. Disconnect whatever rocker linkage is fitted. On the rhs at the end of the cover you will see a hole with a grub screw in it. At the end of this is a piece of lead which deforms and locks the control spring nut. Slacken the screw. It is advisable to have the correct peg spanner to undo the nut or make one. If you come back to me I will give you the sizes. First possible problem; the nut is seized in the cover. If you can't tap it with a suitable punch, you will have to warm the cover around the nut. They generally release after that.

Right you have the spring assy out. Is the spring loose? If so then all your work so far has been worthwhile. It should be stiff to turn by hand. Excess slack here can cause the 3-point to fail.

Next problem; Cut the old boot away. In the groove where it sits you will see two holes. One will have a pin in it. Carefully drive the pin out. If you have a 35 to 175 you will see a rubber plug inside the yoke. Remove this. Using a big flat screw driver try to undo the rod. If it goes, fine. If it is seized you will need to heat it. At the other end you will see a disc inside the cup. In the centre of the disc is a boss with two flats. Try and hold this with a good fitting spanner and attempt to remove the yoke. If it is still seized, apply a little weld to attach the disc to the cup. Hold the yoke in a vice and heat the threaded part of it. You can now fit a stilson to the cup and turn it. The thread between the rod and yoke is EXTREMELY FINE.
I would advise leaving it to cool once you have initial movement. Use plenty of penetrating oil to run down the thread. If it starts to 'pick up' you will have a lot of trouble to seperate them and an almost impossible job to reconnect and adjust.
I cannot over-emphasize the importance of patience in working these two slowly to free them. It it does seize in place you will have to replace the two in all probability.
I will leave it there for now. If you decide to go ahead, please e-mail me with the tractor model and age and I'll take you to the next step.
Good luck
DavidP

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