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Mf12 Vari-Drive Unscrews


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#1 MFDAC ONLINE  

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Posted April 16, 2012 - 07:24 PM

Hello again. I am having some issues with the Vari-Drive pully. I mowed 6 or 7 times last summer with it and I was on my second cutting this spring when the outer flange unscrewed. I took the Vari-Drive off reinstalled the outer pully half, lubed it per owners manual instructions and tried to finish mowing. It lasted less than 5 minutes and it happened again. My owners manual only covers how to remove it for lubrication and the manual implies any futher service to the Vari-Drive pully requires dealer service.In other words there is nothing in my owners manual that covers assembly and dissassembly of the pully itself.

Can anyone help? I did run a search first but came up with no results.

Thanks in advance---DAC

Attached Thumbnails

  • MF12 vari drive.jpg

Edited by MFDAC, April 16, 2012 - 07:25 PM.


#2 MH81 ONLINE  

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Posted April 16, 2012 - 08:30 PM

Dac, Give us a refresher, did you try any locktite on it?

#3 DH1 OFFLINE  

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Posted April 16, 2012 - 08:37 PM

That screw is suppose to be LEFT HAND THREAD.

#4 MH81 ONLINE  

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Posted April 16, 2012 - 08:43 PM

That screw is suppose to be LEFT HAND THREAD.


So, It should tighten, if anything? I wonder if someone retapped it?

#5 DH1 OFFLINE  

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Posted April 16, 2012 - 09:08 PM

This is what the AGCO parts book shows.
001.JPG
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#6 IamSherwood OFFLINE  

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Posted April 16, 2012 - 09:25 PM

Dac?? That pic you posted? That's how you found it when you removed the shroud?

#7 MFDAC ONLINE  

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Posted April 16, 2012 - 09:50 PM

Hello again. I am having some issues with the Vari-Drive pully. I mowed 6 or 7 times last summer with it and I was on my second cutting this spring when the outer flange unscrewed. I took the Vari-Drive off reinstalled the outer pully half, lubed it per owners manual instructions and tried to finish mowing. It lasted less than 5 minutes and it happened again. My owners manual only covers how to remove it for lubrication and the manual implies any futher service to the Vari-Drive pully requires dealer service.In other words there is nothing in my owners manual that covers assembly and dissassembly of the pully itself.

Can anyone help? I did run a search first but came up with no results.

Thanks in advance---DAC

Dac, Give us a refresher, did you try any locktite on it?


No, and no evidence of any there before.

That screw is suppose to be LEFT HAND THREAD.


The slot head screw is left hand thread that holds on the assembly, but the outer pully flange is right hand thread.

So, It should tighten, if anything? I wonder if someone retapped it?


Nothing appears altered and the threaded shaft that the outer part of the pully screws on to measures 1.35".

This is what the AGCO parts book shows.
001.JPG


#45 unscrews off of #42.

Dac?? That pic you posted? That's how you found it when you removed the shroud?


Pretty much except that outer pully section fell on to the cutting deck when I removed the cover.

Later---DAC

#8 DH1 OFFLINE  

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Posted April 16, 2012 - 09:57 PM

I never had one of those assemblies apart, AGRO shows both outer flange pulleys, #45 having the same part #, so they would both be the same.
I don't know how they tightened it up at the factory, #45 on #42, but somehow there has to be a way to tighten them, as was said before try some Lock-tite
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#9 IamSherwood OFFLINE  

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Posted April 16, 2012 - 09:58 PM

Shouldn't that retainer washer (item 50, from agco) hold the outer sheave to the shaft, and
the left hand thread screw, holds the retainer washer to the shaft.

#10 DH1 OFFLINE  

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Posted April 16, 2012 - 10:01 PM

Shouldn't that retainer washer (item 50, from agco) hold the outer sheave to the shaft, and
the left hand thread screw, holds the retainer washer to the shaft.


I think it was to hold #42 on, looks like #45 is bigger ID, than #50 OD.

Edited by DH1, April 16, 2012 - 10:03 PM.


#11 IamSherwood OFFLINE  

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Posted April 16, 2012 - 10:10 PM

Description of #50 is,"retainer outer sheave to shaft".

That's the description given if you look at the MF12G on agco.

I'm thinking that #50 is too small OD, and not doing it's job.
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#12 DH1 OFFLINE  

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Posted April 16, 2012 - 10:19 PM

I have a spare one of those assembly's and the only way I can see to tighten it up real tight is to put 1 outer flange pulley in a vise and a big pipe wrench on the other.
The washer looks to me like it holds on the assembly, the needle bearing, seal and the hub, #42???
The outer flanges just need to be real tight on the hub.
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#13 DanP OFFLINE  

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Posted April 17, 2012 - 06:05 AM

I had the same problem when I took mine apart. I got a new countersunk star washer at the hardware store then I put the pulley in a vise and put just a couple drops of BLUE, not red or green Loctite on the pulley threads and used a big pipe wrench on it to tighten it up. Make sure you get the pulleys on right one of them has a different size shoulder on it. I did not put Loctite on the left hand screw as it can be hard enough to get out. The star washer holds it just fine. I have not had any problem since I did this.
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#14 IamSherwood OFFLINE  

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Posted April 17, 2012 - 06:13 AM

Description of #50 is,"retainer outer sheave to shaft".

That's the description given if you look at the MF12G on agco.

I'm thinking that #50 is too small OD, and not doing it's job.


On second thought, this makes absolutely no sense at all. Disregard this.
If it where done this way, it would be metal wearing on metal. All wrong.
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#15 MFDAC ONLINE  

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Posted April 17, 2012 - 06:31 PM

Description of #50 is,"retainer outer sheave to shaft".

That's the description given if you look at the MF12G on agco.

I'm thinking that #50 is too small OD, and not doing it's job.


Yeah like you said later that wouldn't work since we have a stationary shaft. I guess I need to look up this Agco catalog tho, it sounds very informative.

I have a spare one of those assembly's and the only way I can see to tighten it up real tight is to put 1 outer flange pulley in a vise and a big pipe wrench on the other.
The washer looks to me like it holds on the assembly, the needle bearing, seal and the hub, #42???
The outer flanges just need to be real tight on the hub.


Yes-all you have to do is unscrew the left hand thread countersunk screw and the whole assembly slides off nicely. I better take it to work with me where there are bigger vises and pipe wrenches. The first time it spun off I stuck it in my vice here and secured it tight as I could by hand thinking rotation should hold it on, but no luck.

I had the same problem when I took mine apart. I got a new countersunk star washer at the hardware store then I put the pulley in a vise and put just a couple drops of BLUE, not red or green Loctite on the pulley threads and used a big pipe wrench on it to tighten it up. Make sure you get the pulleys on right one of them has a different size shoulder on it. I did not put Loctite on the left hand screw as it can be hard enough to get out. The star washer holds it just fine. I have not had any problem since I did this.


There are no "bite marks" from pipe wrenches and vises on this assembly yet indicating that this may be the first time this has happened. I sure hope the "shoulder" issue is right, not knowing which way it should be! Thanks for the heads up on which Loctite to use.

On second thought, this makes absolutely no sense at all. Disregard this.
If it where done this way, it would be metal wearing on metal. All wrong.


That's OK man! I appreciate everyone taking a stab at helping on this matter!
I will try to get it assembled again tomorrow at work during lunchbreak!

Later---DAC




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