980H with ride control. Lift cylinders drift. Resealed both lift cylinders. Replaced load lift check valve. Replaced ride control shuttle valve. Replaced O-rings on ride control balance valve. Removed both ride control solenoid valves and energized on bench, OK. Inspected control valve spool centering springs on main control valve and ride control valve, OK. Tested pilot oil pressure, OK. Checked dead engine lift lowering ball valve @ RS of articulation joint. Anybody else have this problem? If so, what did you end up doing to fix it?
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