UPPERSTRUCTURE / Pilot Valve REMOVE AND INSTALL PILOT 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.) Remove Left Pilot Valve 1 CAUTION: Seat (1) weight: 40 kg (88 lb) 1. Remove bolts (2) (2 used). : 16 mm 2. Remove socket bolts (3) (4 used). Remove seat (1) from bracket (4). 3 2 W1JB-02-01-008 : 6 mm 4 W1JB-02-07-007 W2-7-1 1 3 3