TM10-3930-660-20 18-9. RELIEF VALVE, FRAME TILT/BRAKES - TEST/REPLACE (Cont’d) WARNING ‘^- At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injuries. Allow hydraulic oil to cool before disconnecting any hydraulic lines. The relief valve is located under the vehicle, near the forward end of the cab. 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. TAG AND DISCONNECT FIVE HYDRAULIC HOSES  . a. Tag and disconnect five hydraulic hoses (1) from relief valve (2). b. Cap REMOVE open hydraulic hose fittings. FASTENING HARDWARE AND VALVE. Secure valve so it does not fall when mounting hardware is removed. a. b. Remove two nuts (3), two lockwashers (4), and two capscrews (5) that secure relief valve (2) to mounting bracket. Discard lockwashers  (4). Remove   relief valve (2) from vehicle. 18-38