UPPERSTRUCTURE / Signal Control Valve REMOVE AND INSTALL SIGNAL CONTROL VALVE CAUTION: Release any pressure in the hydraulic oil tank before doing any work. (Refer to BLEED AIR FROM HYDRAULIC OIL TANK on W1-4-1.) Removal 1. Remove bolts (2) (4 used). Remove covers (1) (2 used) from the main frame. : 19 mm 2. Remove all hoses and the connectors (2 used) from signal control valve (3). Attach an identification tag onto the removed hoses for assembling. Cap signal control valve (3) and the hose. W1J1-02-05-061 4-Spool Solenoid Valve 3 : 17 mm, 19 mm 3. Remove socket bolts (6) (4 used). Remove signal control valve (3) from bracket (5). W1JB-02-05-004 3 8 mm 5 W1JB-02-10-001 6 W2-10-1 2 1 2