TM10-3930-660-2O 18-5. PISTON  PUMP  - TEST/REPLACE (Cont’d) WARNING When working under the boom always use blocks or other supports. Combined weight of boom and MLRS attachment is approximately 6300 pounds. Failure to adequately support the boom could result in severe injury or death. CAUTION Wipe the area clean around all hydraulic connections to be opened during removal and disassembly. Cap oil lines and plug holes after removing lines. Contamination of the 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. 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. REMOVAL 1. DISCONNECT HYDRAULIC HOSES. a. Tag and disconnect hose (1) and hose (2), from tee (3). Leave tee (3) and reducer (4) assembled to pump  (5). b. Tag and disconnect hoses (6) and (7) from two reducers (8). Leave tee (9) and reducers (8) assembled to pump (5). 18-12