TM10-3930-660-20 18-12. HYDRAULIC JOYSTICK CONTROL VALVE - REPLACE (Cont’d) 1. 2. 3. 4. DISCONNECT PILOT LINES FROM MAIN CONTROL VALVE. a. Remove transmission cover, para. 16-6. b. Tag all four pilot lines (1) to ensure correct installation. c. Disconnect four pilot lines (1). Allow hydraulic oil to drain from lines into a suitable container as lines are disconnected. d. Cap lines and plug openings to prevent  contamination. DISCONNECT LINE (2) FROM SHUTTLE VALVE (3). ALLOW HYDRAULIC OIL TO DRAIN FROM LINE INTO A SUITABLE CONTAINER AS LINE IS DISCONNECTED. DISCONNECT LINE (4) FROM EMERGENCY STEERING PUMP TEE FITTING (5). ALLOW HYDRAULIC OIL TO DRAIN FROM LINE INTO A SUITABLE CONTAINER AS LINE IS DISCONNECTED. REMOVE HYDRAULIC JOYSTICK CONTROL VALVE . a. Place marks (6) on joystick mounting plate (7) and on shelf so joystick can be installed in same orientation. 18-49