TM10-3930-660-20 18-6. MAIN CONTROL VALVE ASSEMBLY - ADJUST/REPLACE (Cont’d) WARNING When working underneath the boom, always support the boom using blocks, jackstands, or other rigid and stable 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. 1. DISCONNECT HYDRAULIC HOSES AND TUBE. a. Tag thirteen hydraulic hoses (1) and one tube (2) for use during installation. b. Unscrew thirteen hydraulic hoses (1) and one tube (2) at fittings (3)  . 2. CAP HYDRAULIC HOSES AND TUBE. Cap hydraulic hose and tube fittings  (3). 18-18