TM10-3930-660-20 18-12. HYDRAULIC JOYSTICK CONTROL VALVE - REPLACE (Cont'd) b. Remove four screws (8) attaching mounting plate (7) to shelf. c. Lift mounting plate (7) off of shelf and disconnect six hydraulic lines from ports on bottom of joystick control valve (9). Tag each line as it is disconnected, to ensure correct installation. d. Match mark joystick control valve assembly (9) and mounting plate (7) to ensure proper orientation during installation. e. Remove four screws, nuts and lockwashers (10) and separate joystick assembly (9) from mounting plate (7). Discard lockwashers  (10). INSTALLATION NOTE Remove caps and plugs as hoses are installed. Wipe all sealing surfaces on valve and hoses clean and dry. 1. INSTALL JOYSTICK CONTROL VALVE ASSEMBLY  (9). a. Attach joystick control valve assembly (9) to mounting plate (7) using four screws, nuts and new lockwashers (10). Observe match marks made during removal STEP 4d. b. Connect six hydraulic lines to ports on bottom of joystick control valve assembly (9). Note tags placed prior to disconnecting lines. c. Position joystick assembly (9) and mounting plate (7) on shelf, using marks (6) for orientation. Apply Loctite 242 to threads of screws (8). d. Install and tighten four screws (8). 2. CONNECT LINE (4) TO EMERGENCY STEERING PUMP TEE FITTING (5). 3. CONNECT LINE (2) TO SHUTTLE VALVE (3). 4. CONNECT FOUR PILOT LINES (1) TO MAIN CONTROL VALVE PORTS, AS TAGGED DURING REMOVAL. 5. INSTALL TRANSMISSION COVER, PARA.  16-6. 18-50