i'm working on a Raymond R50-040QM stand up electric forklift. right before showing this error code lift, tilt and side shift were operating very slowly. we then replaced hyd. filter (spin on type ) and hyd. oil was also replaced using "46R low temp oil" then error code "6G" LIFT SHUTDOWN appeared. lift does travel well in fwd and rev but hyd. functions are inoperable but sideshift still moves slowly. this lift operates in a freezer. thanks, jay