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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF-135 Hydraulic master control spring seized

Bart Ca · 2007-03-16

Hi The hydraulic master control spring on my MF-135 has a little loose. I wd like to unscrew the clevis to change the rubber boot and then reinstall and adjust it. But...I cannot unscrew the clevis from the plunger (I removed the roll pin). Do you guys have a trick to break it loose. Thanks in advance Bart Hi Bart, I'm having probs with Internet connection so will send this in two parts, typed a reply this morning and lost it. No tricks just good ol'engineering. Apply a small amount of weld to either side ofthe plunger rod head and cup. You will now be able to turn the rod with a stilson. If it is not 'free' now you will need to heat the yoke. The thread is extremely fine so make sure that it does not seize as it is being undone. If you can get movement after heating, let it go stone cold. Work plenty of penetrating oil into it. Part 2 follows Hi Bart, I'm having probs with Internet connection so will send this in two parts, typed a reply this morning and lost it. No tricks just good ol'engineering. Apply a small amount of weld to either side ofthe plunger rod head and cup. You will now be able to turn the rod with a stilson. If it is not 'free' now you will need to heat the yoke. The thread is extremely fine so make sure that it does not seize as it is being undone. If you can get movement after heating, let it go stone cold. Work plenty of penetrating oil into it. Part 2 follows With the unit stripped clean the threads and make sure that it is free. You will need to have the weld turned off in a lathe. Fit new boot and assemble. Adjust until the spring is STIFF to turn by hand. Fit the groove pin and rubber plug. Move the DRAFT control lever to fully down. Fit the linkage and screw in the large nut antil endfloat disappears. Overtightening will cause it to reappear. Ensure that you hold the assembly central as you adjust it. Tighten the grub screw at the 3 o'clock position to lock the nut. Fitting of the boot is a pain. A piece of wire with a hook on the end will help. REfit the rest of the linkage. DavidP With the unit stripped clean the threads and make sure that it is free. You will need to have the weld turned off in a lathe. Fit new boot and assemble. Adjust until the spring is STIFF to turn by hand. Fit the groove pin and rubber plug. Move the DRAFT control lever to fully down. Fit the linkage and screw in the large nut antil endfloat disappears. Overtightening will cause it to reappear. Ensure that you hold the assembly central as you adjust it. Tighten the grub screw at the 3 o'clock position to lock the nut. Fitting of the boot is a pain. A piece of wire with a hook on the end will help. REfit the rest of the linkage. DavidP Many thanks David ! Greatly appreciated Bart Many thanks David ! Greatly appreciated Bart

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Bart CA

03-16-2007 16:41:43

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The hydraulic master control spring on my MF-135 has a little loose. I wd like to unscrew the clevis to change the rubber boot and then reinstall and adjust it. But...I cannot unscrew the clevis from the plunger (I removed the roll pin). Do you guys have a trick to break it loose.

Thanks in advance

Bart

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DavidP, South Wales

03-17-2007 08:17:22

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Re: MF-135 Hydraulic master control spring seized in reply to Bart CA, 03-16-2007 16:41:43

Hi Bart, I'm having probs with Internet connection so will send this in two parts, typed a reply this morning and lost it.
No tricks just good ol'engineering. Apply a small amount of weld to either side ofthe plunger rod head and cup. You will now be able to turn the rod with a stilson. If it is not 'free' now you will need to heat the yoke. The thread is extremely fine so make sure that it does not seize as it is being undone. If you can get movement after heating, let it go stone cold. Work plenty of penetrating oil into it. Part 2 follows

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DavidP, South Wales

03-17-2007 08:51:30

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Re: MF-135 Hydraulic master control spring seized in reply to DavidP, South Wales, 03-17-2007 08:17:22

With the unit stripped clean the threads and make sure that it is free. You will need to have the weld turned off in a lathe. Fit new boot and assemble. Adjust until the spring is STIFF to turn by hand. Fit the groove pin and rubber plug.
Move the DRAFT control lever to fully down. Fit the linkage and screw in the large nut antil endfloat disappears. Overtightening will cause it to reappear. Ensure that you hold the assembly central as you adjust it. Tighten the grub screw at the 3 o'clock position to lock the nut.
Fitting of the boot is a pain. A piece of wire with a hook on the end will help. REfit the rest of the linkage.
DavidP

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Bart CA

03-17-2007 10:00:58

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Re: MF-135 Hydraulic master control spring seized in reply to DavidP, South Wales, 03-17-2007 08:51:30

Many thanks David !

Greatly appreciated

Bart

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