Go BottomJohn Deere 4500 3 point bouncing up and down
 | klcdkdk
Join Date: Mar 2011 Posts: 5 Oklahoma 
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2011-03-30 177704
Got a JD 4500 and the 3 point with something on it is bouncing up and down. Went in and put new seals and o-rings on lift piston but no change. Checked relief valve looked ok . Got any ideas?
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2011-03-31 177726
No clue.... but very interested in the answer because my 4115 is doing the same thing.
I noticed it does not do it when the oil is cold. After it warms up it jumps every few seconds.
Do you remember (or know) what type of oil is in your tranny sump? ....
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| klcdkdk
Join Date: Mar 2011 Posts: 5 Oklahoma
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2011-03-31 177727
Hy-Gard John Deere fluid ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2011-03-31 177729
Which one? Regular or Low-Vis?
The reason I ask is that I changed over from mostly Low-Vis to Regular Hy Gard and that's about when I started to notice the 3 point bouncing. ....
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| klcdkdk
Join Date: Mar 2011 Posts: 5 Oklahoma
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2011-03-31 177730
Low ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2011-03-31 177731
Well...... we can eliminate viscosity as an issue. ....
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| klcdkdk
Join Date: Mar 2011 Posts: 5 Oklahoma
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2011-03-31 177732
Yep
It really has me stumped. Temp does make a difference with mine also though ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2011-04-01 177747
Albeit not with a John Deere, but every time I've seen this issue before it was with a leaking control valve, seals normally.
What happens is the 'shock loading' of something like a heavy load, quick travel speed and a bump are more than the seals can handle and the fluid bursts past them. Once that happens they never seal properly again.
Once the fluid gets past it to a certain point the load is low enough to cause the position valve to move it back up to the set point.
Best of luck. ....
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 | greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky 
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2011-04-01 177749
Naw, this is definitely a John Deere problem. My new 3720 did the same thing with only 3 hours on it. And I didn't even have anything heavy on the TPH; just a 7' landscape rake. I was raking gravel on my barn drive, and all of a sudden the damned hitch started pulsing. Jumped about an inch every 1-2 seconds. It quit if I pushed the lift lever all the way forward, but of course that's the open center position. Soon as I pulled the lever back even a fraction, the rake started jumping again. FEL worked fine, problem was only with the TPH.
Shouldn't have overheated fluid for such light work, but I shut the tractor down anyway. Came back again in 30 minutes, problem had gone away. I did eventually discover that the tractor was delivered to me 6 quarts low on HyGard (LoVis). I topped it up, problem hasn't happened again - so I'm wondering if there wasn't perhaps an air bubble in the rear lift circuit that caused the position control to go nuts.....
I couldn't re-create the issue - which as you all pretty well know - means they reflexively blame the owner/operator.
//greg// ....
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| jtdday
Join Date: Jun 2013 Posts: 25 USA
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2013-07-02 187572
MY 4500 HAS A SURG EVERY FEW SECONDS WITH ONLY A WHEELED BAR RAKE ON THE LOWER 3PT WITH FLUID ON THE MARK BUT I HAVE 3000ISH HRS ON IT. ....
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 | kthompson
Join Date: Oct 2005 Posts: 5275 South Carolina
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2013-07-03 187576
Much has improved with seals and such since but oh 40 years ago Ford farm tractors had such a problem with this farmers could not use them to cultivate. Now these were one row cultivators weighing less than 300 pounds normally. Couple of ideas were used and to this day one still carries on that that is wheels on large implements and take all weight off of the lift other than transportation. Ford had developed a tolerance like so many hiccups per minutes was considered acceptable and no idea now that number but for real life work was too many.
However that does not help you with your JD does it. Since the Ford issue have always heard it is a seal somewhere as Murf discussed. At same time it was mentioned this happened with fluid low so may be the system's pickup is high enough if fluid is very much low it is sucking some air and may even do so on grade if fluid is not even low or not much low.
That ole Ford is still in the family and while I no longer use it still that lift jumps.
....
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