420 Main Clutch

General help and support for your Lindeman through 2010 John Deere crawler
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TIMMER6659
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420 Main Clutch

Post by TIMMER6659 » Mon Sep 30, 2013 6:59 pm

I've recently encountered a situation where I push the clutch pedal and the dozer stops but if I take it out of gear and leave it for a few seconds I'm unable to put it back into gear without serious grinding. If I shift reasonably quickly between reverse and second, directly opposite shift positions, I'm fine but by the time I make my way over to 1st or 3rd etc the grinding resumes. The logical conclusion is that the throw out isn't throwing out far enough. Interestingly the problem doesn't occur when the machine is cold but I attribute that to thick transmission oil. I have tried adjusting the bolt on the side to reduce the free stroke of the clutch pedal to 1" but can't get below about 1.5". So assuming my aforementioned logic is sound, where is the insufficient throw coming from? Is there an adjustment to the fingers on the pressure plate? Is there anything else I can do short of pulling the engine and getting at the clutch?

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DukeofDeere
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Post by DukeofDeere » Mon Sep 30, 2013 7:39 pm

Sounds like time to pull the engine and rework the clutch.

Duke

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jtrichard
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Post by jtrichard » Mon Sep 30, 2013 8:02 pm

you might have main seal leaking and getting oil on the clutch
2010 with 622 dozer with mod. 35 ripper and a 2010 with 622 dozer bought in 1969 and a 2010 loader with drott and mod. 36 ripper

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Lavoy
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Post by Lavoy » Mon Sep 30, 2013 9:26 pm

As much as I hate to say it, I think you should pull the engine and check the clutch. Sometimes the clutch discs will bind on the prop shaft and drag against the flywheel or pressure plate and cause this.
While you have it split, check all the linkages for wear, damage, etc.
Lavoy
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TIMMER6659
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Post by TIMMER6659 » Tue Oct 01, 2013 8:35 am

Dang! No magic bullet.
Thanks all.
Guess I'll start wrapping my head around pulling it apart. Secretly I'm reveling in the thought of it however facing the realities of time limitations and priorities. But, a man's gotta do what a man's gotta do. :wink:

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DukeofDeere
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Post by DukeofDeere » Tue Oct 01, 2013 8:43 am

If it is a oil soaked clutch and you are able to access it, depending on which model, you could give it a brake cleaner bath to wash away some of the oil as a temporary fix.

Duke

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scampr
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Post by scampr » Tue Oct 01, 2013 6:30 pm

Make sure you check the pilot bushing too. I have seen those cause that sort of problem too.It will make the input shaft hang up to the flywheel and cause the spinning of it instead of stopping as it should when you push the clutch in. Just another thing to look for but still have to pull it apart... sorry
scampr 440icd, 350B, 47 Farmall H, 55 Farmall cub and ashamed to have a Kabota too

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DukeofDeere
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Post by DukeofDeere » Tue Oct 01, 2013 6:39 pm

I just repaired a throwout bearing carrier that was broke off.
When the clutch was pressed it kept going!
Splitting it is the best option.

Duke

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57jd420
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Post by 57jd420 » Sun Oct 13, 2013 2:21 am

oh yea you for sure have to pull the motor. and its not quite as bad as you think, i can pull the motor off mine in about 30 min, only split mine about 12 times getting my clutch correct.

Buy the gauge to set the pressure plate!!!!!!!!!! eliminates alot of trouble.
send me a pm and i can give you a couple tips that i learned the hard way and will make this job no problem.
Home of the free because of the BRAVE!!!

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Gil
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Post by Gil » Wed Oct 16, 2013 1:14 pm

57jd420, why not post your suggestions here on jdcrawlers? We could all stand to be a little bit more knowledgeable.

I do think it is funny how we all tell folks to pull their final drives whenever they have a steering problem, but hate to mention when they have to pull the engine. Engine is a lot easier, but we all realize that working on the finals is inevitable. Gil
JD440-ICD loader; JD440-IC bulldozer; JD440-ICD backhoe; JD440-I backhoe; JD440-I tractor; + five recumbent JD440-ICs

TIMMER6659
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Post by TIMMER6659 » Sat Jan 04, 2014 1:15 pm

Ok. Confession time. I eventually figured out that my big fat size 13 boot was bottoming out on the footrest. If I push my foot over the top so I get a little more travel it seems to work fine. Having said that however, it seems logical that I have a linkage wear problem somewhere that is messing things up. I tried adjusting the bolt on the side of the housing but it appears to be fully extended. I will have to pull it apart in the spring when it warms up and see if I can figure it out.

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DukeofDeere
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Post by DukeofDeere » Sat Jan 04, 2014 2:07 pm

My 420 does the same with gear grinding after being in neutral. I depress the clutch and pause shift into 1st and them to the gear I want. No grinding this way.

Duke

hydrogeo
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Post by hydrogeo » Sat Jan 04, 2014 7:49 pm

My 40c is the same. Clutch adjuster is maxed and it still wants to grind unless I do as DukeofDeere says.

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Stan Disbrow
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Post by Stan Disbrow » Sun Jan 05, 2014 6:23 am

Hi,

They drag a little on the pilot shaft.....

Stan
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