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Farmall & IHC Tractors Discussion Forum
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450 PRESSURE PLATE

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Hoss357

01-03-2008 10:24:05




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WHAT IS THE CORRECT WAY TO ADJUST THE THREE FINGERS? I THINK THIS IS THE ROOT TO MY LONG PROBLEM THE BOOK SAYS 2 5/16? WHY I THINK IT IS BAD IS THE CENTER HUB WHERE THE SPLINE GOES THRU IS LOOSE? AND IS THIS RIGHT,,WHEN I DRAW IT TO THE FLYWHEEL THE FINGERS MOVE WELL OVER AN INCH? SHOULD THEY MOVE THAT MUCH WHEN BOLTING TO THE FLYWHEEL? GO A NEW ONE ON THE WAY BUT JUST CURIOUS TO WHAT YOU GUYS THINK....WHEN SETTING THAT 2 5/16 DO YOU MEASURE BEFORE OR AFTER BOLTING TO THE FLYWHEEL? ..... IF AFTER HOW DO YOU MEASURE IT????? THANKS IN ADVANCE GUYS YOU GUYS HAVE HELPED ME A BUNCH!!!!!

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Owen Aaland

01-03-2008 14:37:23




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 Re: 450 PRESSURE PLATE in reply to Hoss357, 01-03-2008 10:24:05  
The IH adjusting tool for pressure plates consisted of a round steel table with a threaded rod in the middle. The pressure plate is put over the rod so the friction surface is on the table. Spacers for the pressure plate you are working on are placed on the rod along with a step plate that contacts the fingers. The plate and spacers are drawn down tight to the table and then you use the correct spacer block to measure between the table and the clutch cover at each mounting bolt hole. Adjust the levers until you get the correct fit under each location.

Rebuilders often use just the opposite approach by clamping the clutch cover around the outer edge at a specified height and then adjusting/grinding the levers to get a very precise adjustment, often within a few thousands of an inch.

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Janicholson

01-03-2008 10:47:04




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 Re: 450 PRESSURE PLATE in reply to Hoss357, 01-03-2008 10:24:05  
THe clutch fingers are adjusted for the primary purpose of making the throwout bearing touch each finger equally, and uniformly. This is to avoid viabration and chattering from unequal release action and wiggling of the TO bearing. The distance is (I believe) with a new Driven Disk, and is after installation and tightening. An inch is (from experience) reasonable for this movement. The clutch adjustment at the pedal rod linkage is primary.
The finger adjustment (if taken to extremes) will not correct issues with a worn driven disk.
I usually leave the fingers alone unless there is obvious uneven contact with the throwout bearing.
When measured there should be less than .020" difference in the tip to cover distance. If the driven disk is worn unevenly it will cause the fingers to be different every time they close on the disk in a different place. A new disk should be equal thickness at all points and as such the fingers should be even at every release position of the driven disk, and the pressure plate. I hope this helps, let us know your findings. JimN

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