TM10-3930-660-20 18-26. HYDRAULIC HOSES , LINES AND FITTINGS - REPLACE/RRPAIR This  task  covers: a. Removal b. Inspection c.  Repair d. Installation Tools Materials/Parts Tool Kit, Automotive Mechanics Container, 1 Gal. Hydraulic (App. C, Item 36) Tool Kit, Machinists: Post, Camp Lockwashers  (277) and Station Oil, Lubricating, (App. C, Item 35) Tags (App. C, Item 51) Tool Outfit, Hydraulic System Test Tie Wraps (185, 194, 243) and  Repair  (HSTRU) Cap and Plug Set Equipment  Condition Vehicle parked on level ground. Wheels chocked. REMOVAL 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 reservoir by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can caaue injuries. Allow oil to cool before disconnecting any hydraulic lines. 18-100