Clutch Adjustment: Did I do a Bad Thing?

fixt

Member
I was reviewing the clutch adjustment procedure after completion and came across this note which basically said:

Very Important to adjust clutch release levers with a new primary disc installed.
Adjust the release lever height with a new primary disc installed. If reusing a partially worn disc, the clutch should be installed with a new disc in place then make the adjustments. Remove the clutch assembly and install the partially worn disc without altering the adjustments.

I adjusted my fingers to .060 with the old disc in place.
Did i do something bad?

I'm about to go adjust the linkage since my pedal pivot came in and please don't tell me I need to go readjust the fingers.
I don't think I could take it. It was that bad.
 
Hello, first of all what tractor are we
talking about? If it is a 35-188 with a
dual clutch that's fine. You've said that
you have adjusted the fingers to 060". Do
you mean the three bolts with locknuts
which control second stage operation that
are located in the periphery of the clutch
main pressure plate? If not, how have you
set the release fingers to 060? If you are
referring to the PTO plate adjusters 060 is
too small a clearance. It needs to be 080-
090. The common sense thing to do is to fit
a new main plate because older (in use)
plates have a habit of the lining on one
side breaking up. So you alleviate this
possibility. Normal adjustment procedure
will still apply. If you need to adjust the
PTO screws it can be done through the
inspection cover under the gearbox.
Regarding the release finger screw
adjustment: Height is not so important,
what is, is that they are all the same.
Let us know what you find.
DavidP, South Wales
 

It is a Massey 65 Diesel Utility model

It is the clutch fingers that are VERY hard to get to next to the throwout bearing that the bolt heads are set to .060. The gap was very large before, maybe 5/16.

I did not bother the second stage as they looked to be about the same as what I was adjusting, maybe a 1/16 or a little better.

When done adjusting everything, the PTO stops about an inch off the floorboard using a 1" block. The clutch pedal is a little higher than I would like, but as long as everything is working correctly I can live with it. I just went and measured.
The pedal is 9 1/4" off the floorboard. Its not so bad, now I think about it. My first dual clutch, so that may be normal.
 
If the pto stops with around 1" of pedal
travel remaing that shoud be ok, but not
less. Excessive first stage travel could
well be a symptom of a worn main plate
especially if the fingers are close to
perpendicular to the centre line. You might
be able to juggle the rod and clutch arm
adjustments to lower the pedal height. You
should have 5/16 - 3/8" free clearance
where the arm strikes the casing.
DavidP
 

Well, I will finish it Monday.
The clutch release arm clamping bolt stripped out and I can't get another before then. It must have been on its last legs already.
I'll replace it with a grade 8 and lock washer, nut.
 
(quoted from post at 11:00:08 04/14/18)
It is the clutch fingers that are VERY hard to get to next to the throwout bearing that the bolt heads are set to .060. The gap was very large before, maybe 5/16.


You weren't supposed to adjust those, they need to be set back to where they were.
 

I didn't oil the shaft or clamping arm. That would be like oiling a machine taper. I used a grade 8 7/16 fine thread for the clamping bolt. Gooduntite.

I pulled the inspection cover and checked the spacing on all 3 secondary clutch bolts. All were the same at .086, using a stack of feeler gauges and further checking the stack with a micrometer. I did not molest them further, and buttoned it all back up.

With the linkage adjusted at about 5/16 prior to the clutch arm hitting the casing, my pedal is 8 1/4" from the floor plate. The PTO stops at 1" off the floor plate. I used a 1" aluminum block I had from somewhere for a spacer.
There is little to no grinding when placing the PTO into engine PTO gear and all works as it should.

The clutch pivot bushings helped a great deal. The old ones were worn almost through to the point of tin foil and the pivot itself was fine.
 

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