TM 10-3930-669-20 4.  NO LIFT AND SHIFT FUNCTIONS (CONT). KNOWN INFO TEST OPTIONS Transmission operates. Hydraulic fluid level OK. Hydraulic pump OK. Pressure test. STE/ICE-R #51. POSSIBLE PROBLEMS REASON FOR QUESTION Priority valve faulty. If  priority  valve  is  faulty,  lift  and shift cylinders will not operate. ¬ 2-446

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