TM10-3930-660-20 18-14. FRAME TILT CYLINDER -   REPLACE  (Cont’d) a. b. Start engine and retract frame tilt cylinder by moving frame control to the right. Stop the engine. Hydraulic oil in the system can be under pressures over 3000 psi with the engine OFF . ALWAYS relieve pressure in hydraulic lines before attempting to remove any component in the hydraulic system. With engine OFF, starter switch in RUN position, and MLRS attachment on the ground, move control levers through all operating positions several times to relieve line pressure. Relieve pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. At operating temperatures, is hot and under pressure. hydraulic oil Hot oil can cause injuries. Allow hydraulic oil to cool before disconnecting any hydraulic lines. 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. 5. TAG AND DISCONNECT TWO HYDRAULIC LINES  (5). Hydraulic lines are located between the frame tilt cylinder (4) and cylinder support bracket (6). 18-55