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|Josh Yost||Have above mentioned tractor. The steering and three point hydraulic lift has failed. Not leaking fluid. Need help with pump location and removal.
|Dick||Your pump should be directly in front of the engine and driven off the engine crankshaft, if it is like our 1965 4020 Diesel. The pump is a radial piston design with an unloading feature the lifts the pistons off the actuation cam when there is no need for hydraulic flow. Once a valve is opened or steering input is made, the pistons drop back down on the cam and begin pumping. The pump will require some work to take off, but you should be able to handle it yourself if you are mechanically inclined. If you are uncomfortable about rebuilding the pump, your JD dealer can handle that for you. It is really not that complicated if you decide to repair it yourself. Make sure you clean the outside of the pump thoroughly before starting any disassembly and work in clean environment to prevent and contaminants from getting into the pump, as the tolerance are very tight and even the slightest amount of dirt could render a repair job usless. Just make sure you watch how it comes apart and reassemble it in the same manner once you determine what parts need to be replaced. If you do find the pump has failed, you will need to flush the entire hydraulic/transmission system and replace the filters. I would suggest running the tractor for about a week after you rebuild the pump and change the oil and filters in the hydraulic system. After a week of running, change the filters again to insure that all contaminants are filtered out of the hydraulic fluid.
I'M NOT A SERVICE TECH.HOWEVER I MANAGED A LARGE DEERE DEALERSHIP FOR 5 YEARS, ALSO I HAVE A 1972 4020 WITH A LEAKY HYDRO. PUMP. MY SERVICE MANAGERS OPINON "DON'T FIX TILL IT QUITS" AS YOUR'S HAS FOR THE REMOVAL REQUIRES REMOVING THE FRONT AXEL TO REMOVE THE PUMP.
JOSH PLEASE CONSULT A QUALIFIED DEALER FOR SAFE INSTRUCTIONS AND INFO.
HOPE THIS HELPS.
|James||Does your tractor move. The same pump does the steering, brakes, transmisson, PTO etc. YOu may just have a stuck valve.
|Julie||Any comments about problems with the hydraulic pump for the arms on the back of the 4020?
|BRAD DAVIS||if you have no steering or hydraulics at all, and they quit all at once, check your high pressure pump coupling (the one under the radiator)if intact its probley your transmission charge pump that has a problem
|George Marchon||Dear Sir
I would be gratreful to you if you could kindly explain to me the working of the John deere radial piston hydraulic pump with an unloading feature having a load signal with a drawing if possible.
Marine Chief Engineer
|George Marchon||Dear Si
Request coupling Drawing of how Deutz engine is connected to john deere radial piston pumps
|Andy||Can't be a 1974 4020. Deere quit building them in 1972. You're welcome.
Good luck with your hydraulic woes!
|terry||does the frame plate need to be removed before the front pump can come off ? 1970 j.d. 3020
|jt||where is the transmission charge pump located at
|jt||can u messany any thing up when u splite apart a 4020 tracter