I have a John Deere 4020 that lost all hydraulics. I ...
It is called a destroker. on the left side in front of the radiator is a plug that goes into the top of the pump, takes a 11/16 wrench. remove that plug and install this destroker. start the machine and turn down the destroker screw until it starts to turn hard and then go 1 turn more. let it stay down for 20 seconds and then back out the screw. most of time you will hear the pump kick in and start pumping. if it doesn't try …
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