12. OPERATION 12.12.2 ADJUSTING BUCKET POSITIONER 1. Lower the bucket to the ground and adjust the bucket to the desired digging angle. Set the bucket control lever at HOLD, stop the engine and adjust as follows. 2. Loosen two bolts 1 and adjust mounting bracket 4 of the proximity switch so that the rear tip of angle 2 is in line with the center of the sensing surface of proximity switch 3 . Then tighten the bolts to hold the bracket in position. 3. Loosen two nuts 5 and adjust to make a clearance of 3 to 5 mm (0.12 to 0.20 in) between angle 2 and the sensing surface of proximity switch 3 . Then tighten the nuts to hold in position. Tightening torque:
17.2 ± 2.5 N·m (1.75 ± 0.25 kgf·m, 12.7 ± 1.8 lbft) 4. After adjusting, start the engine and raise the lift arm. Operate the bucket control lever to the DUMP position, then operate it to the TILT position and check that the bucket control lever is automatically returned to HOLD when the bucket reaches the desired angle. 12.12.3 BUCKET LEVEL INDICATOR A and B at the top rear of the bucket are the level indicators, so the bucket angle can be checked during operations. A : Parallel with cutting edge B : 90° to cutting edge 2-67