TM 10-3930-659-34 4-59.  PRIORITY VALVE REPAIR. This Task Covers: a.  Disassembly c.  Assembly b.  Cleaning and Inspection Initial Setup: Equipment Conditions: Materials/Parts: •  Priority valve removed (see TM 10-3930-659-20). •    Dry cleaning solvent (Item 47, Appendix B) Tools/Test Equipment: •    Three preformed packings •  General mechanic's tool kit (Item 71, Appendix E) References: •  Vise jaw caps (Item 12, Appendix E) •    TM 10-3930-659-20 •  Socket head screw key set (Item 41, Appendix E) •  Machinist's vise (item 76, Appendix E) General Safety Instructions: •  Combination wrench set (Item 77, Appendix E) •    Dry cleaning solvent is flammable and must not be •   Socket wrench set (Item 78, Appendix E) used near open flame.  Use only in a well-ventilated area. a.  DISASSEMBLY 1.    Secure  priority  valve  housing  (1)  in  machinist's vise with vise jaw caps. 2.    Remove relief valve cartridge (11) and preformed packing (10) from relief valve housing (9).  Discard preformed packing. 3.    Remove   relief   valve   housing   (9),   preformed packing  (8),  and  spring  (7)  from  priority  valve housing (1).  Discard preformed packing. 4.    Remove  washer  (6)  and  priority  valve  spool  (5) from priority valve housing (1). 5.    Remove setscrew (4) from priority valve housing (1). 6.    Remove   plug   (2)   and   preformed   packing   (3) from    priority    valve    housing    (1).        Discard preformed packing. 7.    Remove priority valve housing (1) from machinist's vise. 4-222