TM 10-3930-669-20 17-11.  PRIORITY VALVE REPLACEMENT. This task covers: a.  Removal b.  Cleaning/Inspection   c.  Installation INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Wrench, Torque (O to 170 lb-ft [0-68 N•m]) (Item 2, Appendix B) Materials /Parts Rags, Wiping (Item 19, Appendix C) Tags, Identification (Item 21, Appendix C) Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10)