TM 10-3930-669-20 6.  SIDE SHIFT CYLINDER DOES NOT OPERATE (CONT). KNOWN INFO TEST OPTIONS Side shift cylinder hoses OK. Priority valve OK. Stack valve OK. Visual inspection. POSSIBLE PROBLEMS REASON FOR QUESTION Side shift assembly faulty. Side shift cylinder faulty. If   side   shift   assembly   is   faulty, side shift cylinder will not operate.  If side shift assembly is OK, side shift cylinder is faulty. KNOWN INFO TEST OPTIONS Side shift cylinder hoses OK. Priority valve OK. Stack valve OK. Side shift assembly OK. Side shift cylinder OK. Verify repair. POSSIBLE PROBLEMS REASON FOR QUESTION If  mast  shifts  left  and  right,  fault has been corrected. ¬ ¬ 2-460