TM10-3930-660-20 18-8. PRIORITY VALVE - REPLACE  (Cont'd) If more than one hydraulic line is to be removed, identify lines to assure proper installation. Use suitable container to catch any hydraulic oil that may drain from  system. 1. 2. DISCONNECT ELECTRICAL LEADS AT HYDRAULIC BYPASS SWITCH (1). a. Remove electrical lead 91 from terminal NC of switch (1). b. Remove electrical lead 10 from terminal C of switch (1). TAG AND DISCONNECT SIX HYDRAULIC HOSES  (2). a. b. Tag six hydraulic hoses (2). Remove six hydraulic hoses (2) at fittings (3) of valve (4). Cap or plug all open hydraulic fittings. 3. REMOVE MOUNTING HARDWARE. Note orientation of valve (4) before removing  it. When performing the following procedure, grasp the valve (4) so it does not drop when fasteners are removed. a. b. c. Unscrew two nuts (5). Remove and discard two lockwashers (6). Remove two bolts (7) from bracket holes  (8). 18-35