Komatsu H70051 Series Operation & Maintenance Manual page 270

MACHINE OPERATIONS AND CONTROLS
5.
If the attachment selector switch is equipped, turn the
switch to the bucket position (A).
6.
Loosen the nut (1). Adjust the position of the proximity
switch (3) so that the rear end (A) of the bar (2) and the
center point of sensory surface (B) of proximity switch (3)
are within the range "a".
a: 37 to 43 mm
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OPERATION