4020 rockshaft leak

dieseldoc · Jul 26, 2014

4020 had a internal leak so I pulled the plug on the back and looked inside. you can see a steady stream of oil running down just to the right of the plug when the arms are all the way down. when the arms are up it sprays oil everywhere. so I pulled the rockshaft control housing and the back dowel pin had half a oring left and the backup ring was messed up. Could that be the cause of my leak. hate to go any further if that is what is causing my leak. Any thoughts on that. thank you

David G · Jul 26, 2014

Those fail, there are upgraded replacements, make sure shaft and bushings are good.

LarrySTN · Jul 26, 2014

Yes, the o-ring and backup could very well be the leak. I would put it back together with the new rings and see if everything is fine. David G thinks you are talking about the draft shaft seals.

dieseldoc · Jul 26, 2014

(quoted from post at 03:23:09 07/27/14) Yes, the o-ring and backup could very well be the leak. I would put it back together with the new rings and see if everything is fine. David G thinks you are talking about the draft shaft seals.

Would that oring and backup ring leak a stream when down and spray when arms are all the way up?

Tx Jim · Jul 27, 2014

I think the seals associated with parts keys 30,31 & 36 are causing your leak. It's also possible 30 & 31 have too little clearance.

dieseldoc · Jul 27, 2014

(quoted from post at 11:38:58 07/27/14)
I think the seals associated with parts keys 30,31 & 36 are causing your leak. It's also possible 30 & 31 have too little clearance.

that housing looks different than the one I am working on. Mine is a side console.

David G · Jul 27, 2014

Yes I did, thanks for catching that.

Tx Jim · Jul 27, 2014

(quoted from post at 09:58:45 07/27/14)
that housing looks different than the one I am working on. Mine is a side console.

Sorry for wrong photo. My crystal ball was covered in dust! :lol:

dieseldoc · Jul 27, 2014

(quoted from post at 17:44:30 07/27/14)

(quoted from post at 09:58:45 07/27/14)
that housing looks different than the one I am working on. Mine is a side console.

Click to expand...

Sorry for wrong photo. My crystal ball was covered in dust! :lol:

Is there an adjustment for the clearance you are speaking of? Or should I just replace the seals and put the housing back on?

Tx Jim · Jul 27, 2014

Screw(parts key 2) adjusts RS control valve clearances. Screw is accessible by removing plug(parts key 25) in 2nd photo

dieseldoc · Jul 27, 2014

(quoted from post at 20:52:30 07/27/14) Screw(parts key 2) adjusts RS control valve clearances. Screw is accessible by removing plug(parts key 25) in 2nd photo

what would be the correct setting for that screw?

Tx Jim · Jul 28, 2014

Sorry It's been way too long since I worked on one for me to remember. Maybe someone with a tech manual will testify.

4020 rockshaft leak

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