John Deere 4020 power shift issue

John Deere 4020 power shift issue Problems

As I understand it there is a check valve between the drive pump and the front reservoir, but it is located near and above the reservoir (cooler) so when the check valve wears out it does not drain the reservoir I don’t have that manualshop or parts catalog to check.They are clearly different between the two main versions of the John Deere 4020.

John Deere 4020 power shift problems

On tractors before the side console, the check valve was on the charge pump at the bottom of the transmission, so when it has a leak it drains the reservoir.The remedy was to turn an elbow into a check valve using Deere parts from some other machine and it works great.

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