2-18
CAUTIONS WHEN WORKING WITH CRANE
• Be sure to verify that the emergency stop cancel switch is at OFF (auto) position before operating the
crane.
Do not attempt the crane operation when the emergency stop cancel switch is at ON (cancel) position.
The emergency stop cancel switch is permitted to be at ON (cancel) position only during the inspection
or maintenance works.
• Crane works are not possible when the outriggers are placed in extension condition. Also, the crane
work becomes halted when an outrigger support leaves the ground during the crane work. Securely
place the crane in the extension condition, and avoid operations and works that may cause the
machine to vibrate when working with the crane.
• Attempt to work beyond the capacity of the Machine may cause serious accidents and failures caused
by for instance tripping or fluctuation. Observe the rated total load chart when working with the crane.
• Do not travel with a load being hoisted under any circumstance.
Such attempt may cause the crane to trip and may result in serious bodily accidents.
• Be slow when operating the crane.
Sudden lever or accelerator operations may cause risks such as waggling or fall of the load and
collision with the surrounding. Be especially careful to be slow during the swing operations.
• Do not let people approach the work radius or below the load, since risks such as fall of the load and
contact with the load exist. Such attempt may result in serious bodily accidents. Also, during the work,
consider the fact that the working radius increases when the load is hoisted and the boom is deflected
thus.
• Attempt to work with the crane even when the view is bad due to location or weather is dangerous.
Ensure brightness by posting a work lamp or other illumination facility in dark places.
When the view is bad because of bad weather (rain, fog, snow), abort working and wait until the
weather recovers.
• Do not use for purpose, for instance raising a person using a crane, other than the true purpose.
• If the overwinding detector alarm buzzer is heard, immediately leave your hand from the winch lever.
The hook block winding stops. Then, operate the winch lever to Down (push forward) to wind down the
hook block. In addition, the hook block is wound up when the boom is extended, so be sure to ensure
extra clearance between the boom and the hook block during work.
• When the boom extends, the hook block is wound up.
Operate the winch lever to Down (push forward) to wind down the hook block while you extend the
boom.
• Whenever an overload occurs during work, lower the load by winding down the winch by setting the
winch lever to Down (push forward).
Do not raise or lower the boom acutely. Such attempt may cause serious accidents by tripping.
• The volume of the hydraulic oil in each of the cylinders changes depending on the temperature.
By leaving idle with a load being hoisted, as the time passes by the oil temperature drops and the
hydraulic oil volume decreases, and changes such as the boom derrick angle decrease and boom
length decrease may occur.
In that case, execute boom derricking operations and boom extension operations appropriately to
correct.
• Do not leave the driving operation position when a load is hoisted.
Lower the load before leaving the Machine.
• Keep the hook block wound up when not in use.
Otherwise, person near the load may collide the hook block without load.
• The operator must always ensure that no one is ever underneath a hoisted load.
To ensure safety, any lifting carried out over the driver's seat must be operated by remote control.
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