• The stability of the crane is determined horizontally. Although the stability also increases diagonally,
work exceeding the rated load causes the breakage of the boom or machine. The moment limiter
(overload detector) must not be activated even in diagonal direction.
• Be sure to verify that the moment limiter emergency stop cancel switch is at OFF (auto) position before
operating the crane. Do not attempt the crane operation when the moment limiter emergency stop
cancel switch is at ON (cancel) position. The moment limiter emergency stop cancel switch is
permitted to be at ON (cancel) position only during the inspection or maintenance works.
• Pay attention to indication and warning on the moment limiter while working.
• 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.
• Be slow when operating the crane.
Sudden lever or accelerator operations may cause risks such as swinging or falling of the load and
collision with the surroundings. Be especially careful to be slow during the swing operations.
• Determine a work supervisor for crane operation and always follow the instructions of the supervisor.
Follow the instructions of the supervisor for work methods and procedures.
Determine how to give signs and follow these signs.
• A long load is instable when hoisted and thus, dangerous. Attach a rope to the both ends of the load to
make the load stable.
• Do not let people approach the work radius or stand 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.
• Work that goes beyond the machine performance will cause accidents and failures. Particularly, the
crane operation must be performed based on the rated total load chart.
• Be careful to prevent the wire rope and/or hoisted load from contacting an obstacle such as a tree or
steel when hoisting a load.
If caught by an obstacle, do not forcibly wind up the hoist load, but untangle the caught part before
winding up.
• Do not pull laterally, pull toward you or hoist diagonally. Such attempt may cause the crane to tip or
suffer damage.
• Attempt to work with the crane 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, and 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 over-winding 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 allow
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 tipping.
• 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 and place lock lever to LOCK position 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.
• Operator must not leave operation seat during operation.
• The work that hoists an attachment that generates some vibration such as VIBROs is forbidden. The
vibration of the attachment may break the winch, etc.
To Next Page
Loading...
