49EXCAVATOR OPERATION
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 supplied 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.
To avoid personal injury:
A Stop the engine before removing/changing the
equipment.
A Release pressure in the hydraulic system
before removing/changing the equipment. (See
"HOW TO RELEASE PRESSURE TRAPPED IN
THE HYDRAULIC SYSTEM".)
A Position the selection valve to the correct
position (either 1-way or 2-way circuit
selection) before mounting the equipment.
A Always select the correct valve position before
mounting the equipment (1-way or 2-way
circuit selection) to avoid sudden movement of
the equipment.
A Leaving the selection valve to 1-way circuit selection
and attaching 2-way circuit equipment may cause the
equipment to move (drop) suddenly due to its own
weight, as the tank line remains open, even with the
engine off.
A 1-way circuit.....
A 2-way circuit.....
HAMMER etc.
THUMB, TILT BUCKET,
AUGER, GRAPPLE etc.
(1) Selection valve
(A) Hydraulic flow
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