2-79
CONTROLS
Selector valve
Open ....... When using a hydraulic breaker
(1-way flow)
Closed ..... When using a reversible
attachment (2-way flow)
Change the direction of the hydraulic oil flow
by opening or closing the selector valve (1)
inside the right side cover.
For the machine with the auxiliary 1st auto
tank switch, use the switch to select the
flow.
Refer to “Auxiliary 1st auto tank switch (If
equipped)” on page 2-56.
ACCESSORIES
Third auxiliary hydraulic switch and
button (If equipped)
The auxiliary 3rd is mainly used for the
attachment that can quickly connect/
disconnect the bucket. After the engine is
started, hydraulic oil constantly flows into the
pipe (e). This allows the pressure in the (e)
side to increase, preventing the pin inserted
on the bucket from coming out. If the
pressure in the (e) side drops, the warning
lamp starts flashing to warn that the bucket
may come out. For a safety reason, the
bucket can be disconnected only when the
button (1) and the switch (2) are pressed at
the same time. When they are pressed, the
hydraulic oil flows into the line (f) to increase
the pressure there. As the result, the pin on
the bucket comes out and the bucket is
removed from the machine.
• Bleeder unit for simultaneous use with
the auxiliary 1st and 2nd (if equipped)
Pressing both the auxiliary 3rd button (1)
and the switch (2) makes it possible to
release internal pressure from the auxiliary
3rd (e side), auxiliary 1st and auxiliary 2nd
at the same time. (The pressure is kept
drawn for six seconds after the button and
the switch are released.) This enables
faster attachment change.
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