Quoting Removed, click Modern View to seeThe reason that I suggested the check valve, is that it should not open & allow any flow to lift cylinder below 115PSI (equivalent to ~75 # lift force) and the back pressure valve sets steady state non-lift/hold pressure at ~40PSI (equiv to ~25# force), so a non-commanded lift condition should not see the minimal lift force that you have unless the check valve is leaking.
If the control valve is somehow commanding lift when you are not (with touch control lever), as with a mis-adjusted linkage, that should slam the unloader valve to full lift condition, thereby yielding ~1250 # lift force. Since unloader is not variable, but rather full open or full closed, I don't see the problem being in that area. Of course, there are still many other possibilities such as cracked housing, worn out leaky valves, etc.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.