Komatsu PC490-11, Installation And Instruction Manual

Page: 267 / 492

• Swing control
Move the L.H. work equipment control lever to the right
and left.
The upper structure swings.
• Boom control
Move the R.H. work equipment control lever back and
forth.
You can operate the boom.
• Bucket control
Move the R.H. work equipment control lever to the right
and left.
You can operate the bucket.
If the work equipment control levers are returned to NEUTRAL position when the machine is stopped, even if
the fuel control dial is set to High idle (MAX) position, the auto-deceleration mechanism works to reduce the en-
gine speed to the low speed.
REMARK
This machine is equipped with an accumulator in the control circuit. Even if the engine is stopped, if the starting
switch key is turned to ON position within 15 seconds after stopping the engine, and the lock lever is set to
FREE position, it is possible to use the lever operation to lower the work equipment to the ground.
This procedure can also be used for releasing the remaining pressure in the hydraulic cylinder circuits or for
lowering the boom after loading the machine onto a trailer.
HANDLE WORKING MODE
METHOD FOR SELECTING WORKING MODE
Use working mode selector switch (1) to select the working
mode that matches the operating conditions or purpose. This
will make it possible to perform operations efficiently.
Use the following procedure to select the most efficient working
mode.
When the starting switch is turned ON, the working mode is set
to the mode that was in operation when the starting switch was
last turned OFF.
Use the working mode selector switch to set the mode to the
most efficient mode to match the type of work.
OPERATION MACHINE OPERATIONS AND CONTROLS
3-195