TM10-3930-660-20 18-32. BOOMM  HOIST  CYLINDERS  -  REPLACE  (Cont’d) 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. If inner or intermediate sections of boom have been removed, cap three hydraulic lines (a) at underside of outer boom with metal caps. If MLRS attachment has been removed, cap three hydraulic hoses (b) at front of boom with metal caps. Failure to do so may result in personal injury caused by hydraulic oil spraying out of open hoses or lines when engine is started. CAUTION Wipe area clean around all hydraulic connections to be opened during removal. Cap lines and plug openings after removing lines. Contamination of hydraulic system could result in premature failure. 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. Weight of boom assembly and MLRS attachment is approximately 6300 lbs. Weight of boom assembly alone is approximately 4100 lbs. Weight of each boom hoist cylinder is approximately 182 lbs. 18-127