EXCAVATOR OPERATION46
4. Move the AUX port knob mounted to the operating
lever to the right to release pressure in the AUX port.
1-way or 2-way CIRCUIT SELECTION
VALVE OPERATION
A selection valve which selects 1-way or 2-way circuit of
service port has been installed on the hydraulic tank.
1. When equipment which needs a 1-way circuit will be
used, position the arrow, by using the selector lever,
on the axis of the selection valve to the 1-way circuit
position, to reduce the back pressure.
2. When equipment which needs a 2-way circuit will be
used, position the arrow on the axis of the selection
valve to the 2-way circuit position.
(1) AUX port knob
(2) Attachment control lever (right)
A 1-way circuit.....
A 2-way circuit.....
HAMMER etc.
THUMB, TILT BUCKET,
AUGER, GRAPPLE etc.
(1) Selection valve
(2) Selector lever