TM10-3930-660-20 18-32. BOOM HOIST CYLINDERS - REPLACE This task covers: a. Removal b.  Installation Initial Setup Tools Tool Kit, Automotive Mechanics Shop  Equipment,  Automotive Maintenance and Repair, Common #1 Less Power Shop  Equipment,  Automotive Maintenance, Common #2 Less Power Lifting Device, 5 ton capacity Materials/Parts Anti-seize Compound (App. C, Item 9) Container, 1 Gal. Locknut (3, 8) Tags (App. C, Item 51) Wood Block, 1x4 Wood Board, 2x4 Personnel  Required Two Personnel Lifting Device, 200 Lb. Capacity Reference TM10-3930-660-10 Cap and Plug Set Equipment  Condition Vehicle parked on level ground. Parking brake set and wheels chocked. 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. 18-126