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2. Function Check
NOTICE
• The machine cannot be operated when
the upper or lower emergency stop button
is pushed in. Pull out both of the upper
and lower emergency stop buttons before
pre-operation checking.
• The platform leveling system may not
work properly when ambient temperature
is low. Perform warming-up operation
of the machine to raise the hydraulic oil
temperature.
2‒1 Preparation for Function Check
Make sure the rotation lock pin is unlocked.
NOTICE
Operating with rotation locked will result
in machine damage.
Rotation is locked
Rotation lock pin
Rotation lock pin
Unlocked
M179B12-1
Fig. 6‒1
Put the machine on a firm, level surface.
Set up the machine in the following state:
- Platform rotation: center
- Platform load: 0 kg
- Boom elevation: fully lowered
- Boom rotation: rear center
2‒2 Lower Controls Check
Do the checks first with the lower controls,
then with the upper controls. In steps up to
this section, operate the boom using the lower
controls.
Turn the key switch to “
” (LOWER
CONTROLS) and make sure that the
alarm buzzer sounds for about 3
seconds, just after turning on.
WARNING
If the buzzer does not sound properly, the
machine is faulty. Do not use the faulty
machine.
Hold the pre-operation check switch up.
Make sure the alarm buzzer sounds for about 3
seconds after the pre-operation check switch
has been held up.
NOTICE
If the buzzer does not stop sounding , the
boom functions are disabled.
Start the engine and, idle the engine for
warming up.
Make sure there are no strange sounds come
from any part.
Check that all safety systems are functioning
properly.
- Emergency stop: push the emergency stop
button while operating the boom, and make
sure that both the boom operation and the
engine stop.
- Emergency pump: Make sure that the boom
can be operated while the emergency pump
is being operated.
Check that no oil is leaking from the hydraulic
components, hoses and pipes.
