Erratic jd 300b 3 point movement

   / Erratic jd 300b 3 point movement #1  

65sixbanger

New member
Joined
Aug 10, 2014
Messages
7
Location
Bryan,tx
Tractor
Jd 300b
Hello, this is my first of many posts to this forum.

I have a john deere 300b with a loader and 3 point arms on the back. I have an internal hydraulic leak I'm trying to figure out before tearing it apart.

First off, the lever position is only useful for about an inch of the total travel, lots of free travel before they pick up, and when they do it's very sensitive. Different draft positions affect this a little, but not much.

Secondly, with a 6 ft shredder on back, raised all the way up, any movement of the loader will allow the shredder to fall until the loader handle is back in it detent, then the shredder jumps back up. Similarly, when the tractor is shut off, the shredder falls very fast.

So first off I assumed this was a rock shaft cylinder leak, but looking through the oil fill cap, the cylinder wall looked dry. However I can see oil dripping fast from the valve.

What do y'all think? Bad o rings in the valve?
 
   / Erratic jd 300b 3 point movement #2  
Look inside hyd filler hole for spraying oil with 3 pt raised & engine running indicating blown 3 pt control valve seals.
 
   / Erratic jd 300b 3 point movement
  • Thread Starter
#3  
Look inside hyd filler hole for spraying oil with 3 pt raised & engine running indicating blown 3 pt control valve seals.

Yes you can see oil dripping steadily from the valve
 
   / Erratic jd 300b 3 point movement #4  
Then rockshaft housing needs to be removed from tractor and control valve seals & RS piston seals replaced.
 

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