TM10-3930-660-20 18-13. BOOM CYLINDER FLOW CONTROL  VALVE  - REPLACE (Cont’d) 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. The flow control valve is mounted on the main boom control valve. 1.   TAG AND DISCONNECT TWO HYDRAULIC HOSES (1 AND 2). a. Tag hydraulic hoses (1) and (2). b. Unscrew hydraulic hoses (1) and (2)  from  flow  control  valve  (4). 2. 3. REMOVE HYDRAULIC HOSES ACCESS TO FLOW CONTROL Remove hydraulic hose fitting  (7). (3) TO GAIN VALVE  (4). (3)  from REMOVE VALVE (4) FROM MAIN CONTROL VALVE  (6). Retain reducer (5) and remove flow control valve (4) from main control valve (6). 18-52