John deere 3320 cavitation fluid related?

[Justjake450]

Hey all I am looking for some opinions here. I have a 2012 3320 which is getting close to 500 hours and I love this tractor. The only issue is I have the so called cavitation and jumpy 300cx loader and 3-point. Which sounds somewhat common in this line and my dealer, lots of research, hours of troubleshooting say there isn't really a resolution to this (which I find hard to believe) anyway I have ran the machine for a few years telling myself there is nothing to be done and the issue hasn't got any better or worse. All in all this issue drives be crazy and I hate to sell a great tractor for just this 1 issue. So I'm to the point I'm willing to try anything and am considering trying a few different fluids in it. Hydraulic system has been serviced to JD spec fluids with no issues found in the past and the issue has always been the same. I am thinking about trying some universal fluid or synthetic to look for any improvement. Sound like a good or bad idea? Thanks for any input or even better a different way to solve this issue!

I'm sure a few will ask what all has been checked out for this issue and all troubleshooting has been done and I have narrowed the issue down to a blip down in charge pressure with the cavitation sound. relief is okay and responds well to shimming adjustment but problem continues. Suction manifold has been replaced incase of pin hole and everything resealed on suction side. pressures and flow okay, no debris found in system ever.

 

[beenthere]

Interesting !
But don't follow the problem or the attempt at solution.
Maybe others know more about it, and we can be enlightened what is going on.

 

[Deere Dude]

So what fluid is being used right now?

 

[Cperk]

My 4120 calls for low viscosity hydraulic fluid. What does your tractor call for? Reason I’m asking is the dealer gave me regular hydraulic fluid one time and it cavitated like crazy. My wife of all people asked why did my old bucket say low vis and this one didn’t. Lol That’s how I figured it out. Drained it all back out and filled back up with low vis. Problem gone, albeit $175 later.

 

[Justjake450]

Its running low viscosity hy-gard currently

 

[kennyd]

My 3720 does this occasionally, and I’ve read of many others that have it happen constantly. My machine has under 200 hours and I use the JD Hygaurd fluid. This seems to be the luck of the draw-some have it and some don’t. I’ve never heard of a solution...

 

[Oldtink]

My 2010 model 3520 will make that sound when lifting an 800lb. 7Ft RFM after mowing for 2-3 hours but not when I first start the tractor. I questioned my dealer's shop manager about switching to regular HyGard and he suggested I not do that. I respect and value his opinion and stuck with the LoVis.
Close to 800 hours on the tractor now and nothing has changed, still works just fine just annoying to hear that sound. My JD has a better health care provider than I do.

 

[Kubota 2350]

My JD has a better health care provider than I do.

:laughing::laughing:

 

[Cperk]

Its running low viscosity hy-gard currently

Can you mostly hear it in the steering? Worse in cold weather? Wonder if there’s an inline strainer on yours? Heard some have got stopped up and some screens have even calapsed causing cavitation noise.

 

[Justjake450]

No the steering is fine, only really noticeable in loader and 3-point lift. The only thing that really makes it worse is when your traveling a lot/faster and using the loader. It does have inline screen and its clean.