TM10-3930-660-20 14-10. STEERING  CONTROL  VALVE  - REPLACE This task covers: a. Removal b.  Installation Initial Setup Tools Materials/Parts Shop Equipment, Automotive Tags (App. C, Maintenance and Repair, Common #l Less Power Item  51) Cap and Plug Set Equipment  Condition Vehicle parked on level ground. Turn signal switch removed, para.  8-13. Steering wheel removed, para. 14-3. Steering column removed, para. 14-4. WARNING 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 tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. 14-20