TM 10-3930-659-20 12-28.    PRIORITY VALVE AND MOUNTING PLATE REPLACEMENT. This task covers: a. Removal b. Installation Initial Setup: Equipment Conditions: Equipment Conditions (Con't): • Parking brake set (see TM 10-3930-659-10). • Priority valve-to-main hydraulic pump line and fittings • Frame locking bar installed (see TM  10-3930- removed (see paragraph 12-8). 659-10). • Priority valve-to-secondary steering manifold hose • Hydraulic reservoir drained (see LO 10-3930- and fittings removed (see paragraph 12-9). 659-12). • Priority valve-to-steering valve hose and fittings • Right transmission side guard removed removed (see paragraph 12-10). (see paragraph 14-7). Tools/Test Equipment: NOTE • General mechanic's tool kit (Item 44, Appendix F) All hoses should be tagged before removal. Refer to paragraph 2-18 for tagging instruc- References: tlons. • LO 10-3930-659-12 • Priority valve-to-hydraulic reservoir return • TM 10-3930-659-10 hose and fittings removed (see paragraph 12-6). • Hydraulic oil return tube and fittings removed (see paragraph 12-7). a. REMOVAL 1. Remove two nuts (12).  washers (11).  screws (9).  washers (8).  priority  valve  (7),  and  two  spacers  (10)  from mounting plate (4). TA707608 12-71