UPPERSTRUCTURE / Control Valve REMOVE AND INSTALL CONTROL VALVE IMPORTANT: 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 (3) (4 used). Remove covers (1, 2). : 17 mm 2. Remove the 4-spool solenoid valve unit and signal control valve. Refer to the Remove and install 4-Spool Solenoid Valve Unit section (W2-9-1) and the Remove and Install Signal Control Valve section (W2-10-1) respectively. 3. Remove all the connectors, hoses and pipes from control valve (4). Attach an identification tag onto the removed hoses for assembling. Cap the open ends. W1V7-02-08-001 : 17 mm, 19 mm, 22 mm, 36 mm :
8 mm 4-Spool Solenoid Valve Unit CAUTION: Control valve (4) weight: 216 kg (475 lb) 4. Install eyebolts (M10, Pitch 1.75 mm) (2 used) to control valve (4) and hold control valve (4). 5. Remove bolts (7) (4 used) from the bottom of main frame. Hoist and remove control valve (4) from brackets (5, 6). W1V1-02-05-021 Signal Control Valve 4 Eyebolt Mounting Hole (M10, Pitch 1.75 mm) : 24 mm W1V1-02-05-063 W2-5-1 2 1 3 4 Ey (M 4 6 5 7 W1V1-02 4 6