john deere 420c steering clutch linkage adjustment...

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E.Huffman
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john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Sat Jan 22, 2022 4:44 pm

Hi guys about to pull my hair out over my rebuilt steering clutch. It feels likeit is adjusted too far in but am at the end of adjustment. and it is fully rebuilt. is there linkage that could be adjusted to take some of the slack in the lever up? I have been through the standard clutch / brake band adjustments multiple times but it seems the handle is coming to far back befor the throw out starts to move.... thanks in advance!

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Re: john deere 420c steering clutch linkage adjustment...

Post by Buckhorn » Sat Jan 22, 2022 5:14 pm

Are you going by the adjustments in the service manual? The adjustments are also in the operators manual.
By doing the adjustment, it should put the throw out bearing up against the fingers. Any further pulling of
the lever should move the fingers.

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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Sat Jan 22, 2022 6:41 pm

Yes I have been going through correct procedures in the book. when I pull the lever back the throwout does not move untill the handle is halfway pulled back....

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Re: john deere 420c steering clutch linkage adjustment...

Post by dtoots1 » Sat Jan 22, 2022 7:03 pm

Just curious....where is the throwout bearing in relation to the groove...is it at the end to almost clean out of the groove? my 440 runs right at the edge...just manages to lock on lip...with the new clutches.

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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Sat Jan 22, 2022 8:20 pm

Yes mine is right at the edge as well Both clutches are rebuilt one works beautiful the other does not... What is the chances of have a weak pressure plate?

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Re: john deere 420c steering clutch linkage adjustment...

Post by Lavoy » Sat Jan 22, 2022 10:00 pm

Shorten the linkage to the steering lever shift.
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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Mon Jan 24, 2022 6:11 pm

So I shortened that linkage to where there is no play and handle feels super good. but alas still wont hardly respond until pulled all the way back... Is the pressure plate a potential problem? I dont know how they act when they go out....

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Re: john deere 420c steering clutch linkage adjustment...

Post by Jim B » Mon Jan 24, 2022 6:47 pm

You said both clutches were rebuilt. All new parts? Were the pressure plate fingers set with the JD7 gauge? What was the condition of the inserts in the quill and cam, as well as the balls between them?

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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Tue Jan 25, 2022 7:17 am

The balls and inserts seemed good, the pressure
Plate on this side is a little older than the other side. Being a year or 2 old

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Re: john deere 420c steering clutch linkage adjustment...

Post by Jim B » Tue Jan 25, 2022 8:44 am

Lever travel can be affected by wear anywhere in the linkage. How tight are any pins in holes and the ball joints on the linkage to the cam? The manual gives a free travel dimension for the steering lever. Does the free travel of the right lever match that dimension? That is from the lever on its rest until the throwout bearing touches the pressure plate fingers. If it has more free travel than specified, the clutch will be late releasing. Move the lever to the max dimension of free travel (or just a bit less) shown in the manual and block it at that point so you can let go of the lever and really check to see that the throw out bearing is touching the pressure plate fingers and that all the slack is out of all the linkages.

Just some other thoughts of things that might affect this.

What was the condition of the spline surfaces of the hub and drum? Deep grooves from wear can cause discs to hang.

Did you by chance measure the thickness of the discs you installed to see if they were to spec. And of course, the wild card is the reused pressure plate, but you aren't saying it slips, but the opposite, it won't release. That could still be caused by something in the pressure plate.

If the balls are undersize or there are wear ramps in the inserts it could require more travel to get the required outward movement of the cam.
Jim

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Re: john deere 420c steering clutch linkage adjustment...

Post by dtoots1 » Tue Jan 25, 2022 9:21 am

After you shortened the linkage, did you readjust everything again? I had to readjust my 440 3 times when i had a similar problem with all new throwout , carrier tube and clutches

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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Tue Jan 25, 2022 11:28 am

So no I did not readjust every thing... there is no play in the linkage and it feels correct. The other side that works wonderful has plenty (almost too much) free travel and has play in the linkage and I can feel distinctly when the clutch engauges and it steers beautiful.

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Re: john deere 420c steering clutch linkage adjustment...

Post by dtoots1 » Wed Jan 26, 2022 3:38 pm

let us know what you find out. think that brake adjustment is kinda critical, also did you relace brakes?

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E.Huffman
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Re: john deere 420c steering clutch linkage adjustment...

Post by E.Huffman » Thu Jan 27, 2022 10:32 am

Yes it ended up being the brake adjustment.. I feel so dummm...... It was too loose and man it steers nice!!!!

dtoots1
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Re: john deere 420c steering clutch linkage adjustment...

Post by dtoots1 » Thu Jan 27, 2022 11:25 am

Exactly...thats why mine acted stupid as well....old rule...K.I.S.S.....keep it simple
Saved me a trip down..though would like to when warmer

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