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The mid and rear leveler legs operate in Tandem on each side.. What affects mid leveler with also affect rear leveler for that side..
There is a separate solenoid valve for each side set of leveler legs (mid and rear).. I’d first verify the manual override screw for the affected side is fully closed.. easy to check with 1/8 inch Allen wrench.
If it’s good then most likely you’ve either got a solenoid valve that’s not fully closing or you have an internal bypassing cylinder on either the mid or rear leveler leg on affected side..
This is also quite easy to verify if one of the cylinders is bypassing by following Lipperts simple test.. sec second pic
Hydraulic pressure used to keep leveler jacks retracted is well over 2000 psi so follow safety precautions when working on pressurized system
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