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OPERATION
Machine Push-up Switch
When using the boom thrust force to push up the chassis when moving down from a bench, there is dan-
ger that the machine may suddenly go down and turn over, so set to the high-pressure setting.
This switch (6) is used to switch the safety valve set pressure
at the head end of the boom cylinder to two levels.
(a) Low pressure setting:
The boom thrust force is weak, so swaying of the chassis is
small during digging operations, and digging can be performed
smoothly.
This is used for general digging operations on normal ground,
soft rock, or blasted rock.
(b) High pressure setting:
The boom thrust force becomes more powerful, so it is easy to
twist and swing or escape from soft ground. It is effective in
performing digging operations using the bucket and weight of
the machine in confined areas.
Boom Shockless Control Switch
Switch (7) controls the shaking of work equipment when the
boom is stopped.
Effect
q The shaking and spillage of load from the bucket is
reduced.
q Operator fatigue is reduced when operating for long peri-
ods, so operations can be performed saftely.
REMARK
When the switch is at the ON position (a) and the boom is
stopped, the movement of the boom until it stops will increase
slightly.
Be careful when using this operation until you become accus-
tomed to it.
The boom drifts down and it is difficult to position it, so set this
switch to the OFF position (b) when carrying out operations
with a raised load.
WARNING
DETAILED CONTROLS AND GAUGES
3-37
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