220 hydraulics

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This piece split on us last year.  My dad was mowing with it and it split.  Know today I was going down the road and raised the 3pt hitch and it split.  When the hydraulics dead head my relief valve must not be releasing.  So my question is where do we start to look for our problem. Is it in the pump or the valve stack?  Looking at agco parts book that piece is still a valiable!

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ToddnwIl Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 07 May 2013 Location: Illinois Points: 282	Post Options Post Reply Quote ToddnwIl Report Post Thanks(0) Quote Reply Topic: 220 hydraulics Posted: 16 Mar 2024 at 4:53pm
	This piece split on us last year. My dad was mowing with it and it split. Know today I was going down the road and raised the 3pt hitch and it split. When the hydraulics dead head my relief valve must not be releasing. So my question is where do we start to look for our problem. Is it in the pump or the valve stack? Looking at agco parts book that piece is still a valiable!

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 20579	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 16 Mar 2024 at 11:04pm
	System pressure is to be 2,200 psi MAX. The main relief valve must be the problem, but why would it start acting up on its own? They cannot adjust themselves. You'll need a 3000 psi gauge to plug into a remote outlet and test/adjust the main relief which is at the left front corner of the console with an acorn nut. DO NOT exceed 2,200 psi while you gently feather the remote lever !! Remove acorn nut and adjust pressure downwards probably 1/2 turn to begin with. This has failed twice in less than a year ??

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8251	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(0) Quote Reply Posted: 16 Mar 2024 at 11:09pm
	The system relief is set too high or stuck. You must put a pressure gauge in outlet to check and adjust accordingly. Often a weak pump gets the relief cranked up to try making it perform better then when the pump is replaced with a good one the relief is TOO HIGH and bang! Ask how I know.....

ToddnwIl Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 07 May 2013 Location: Illinois Points: 282	Post Options Post Reply Quote ToddnwIl Report Post Thanks(0) Quote Reply Posted: 17 Mar 2024 at 8:28am
	This 220 has bin more of a parade tractor since I've owned. Just in the last couple years have we started using it. Since we started using it we have had nothing but hydraulic pump problems. I'm guessing the previous owner prolly messed with the preasure relief valve and that's bin most of my problems.

rw Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 Oct 2009 Location: United States Points: 384	Post Options Post Reply Quote rw Report Post Thanks(0) Quote Reply Posted: 17 Mar 2024 at 8:47am
	Too bad you you lost a second pump. Checking the pressure periodically would be good maintenance and really pretty easy and quick as long as it falls in range. A lot of hydraulic power line construction equipment prescribe checking relief pressures in the preventative maintenance schedule. Some have gauges to monitor pressure while operating. Our 190XT had some problems for a while breaking pumps, weak to lift etc. We ended up replacing the relief valve because for some reason the old one would not hold adjustment consistently. We also found the threads on the through bolts for the pump were pulled over a bit after one pump cracked. I suspect if they stretch in length slightly it wont keep the pump sections squeezed together creating a weak link that lets the pressure crack the pump housing.