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2.4 PRECAUTIONS WHEN WORKING WITH CRANE
INSPECTION BEFORE STARTING WORK
Check that the safety devices and crane operate properly.
• Operate each of the operation levers, pedals and switches under no load, and check that operations
take place without abnormality.
Repair immediately if any abnormality exists.
• Check that the safety devices such as the moment limiter, over hoist detector device and three-winding
stop alarm device activate properly.
PRECAUTIONS WHEN DECIDING THE CRANE OPERATION SITE
Always place the machine on the level and solid ground.
Crane operation is dangerous when the machine is placed in a site as below:
• Temporary asphalt pavements
• Thin concrete pavements
• Stone pavements
• Where the surface looks solid but the soil under it is soft, or the soil below pavement is washed by
water to become hollow.
• Soft grounds which may collapse or are near a shoulder of a road or an excavated hole.
• Slopes
PRECAUTIONS FOR CRANE OPERATION ON A SLOPE
Where a crane operation on a slope is un-avoidable, fill some soil (B)
to prepare a level and solid groundwork, first, and then place the
machine on it, so that overturning is prevented.
Unless this is done the crane is not placed level and attempting to
hoist will mean that the moment limiter (over-load detector) will not
work accurately, as well as un-foreseeable force to the machine
which may overturn or damage it.
FOLLOW INSTRUCTIONS AND SIGNS WHEN WORKING
• When working with the crane, appoint a work supervisor and mutual
signs beforehand, and follow the work supervisor and signs during
work.
• When working at a location where many parts are out of sight from
the driver, be especially careful to follow the instructions and signs
of the work supervisor and pay attention when driving.
• When working with the crane, the clearance between the boom and
the upper structure and also the gaps between the movable parts of
the derrick cylinder may catch body parts such as an arm or finger.
The driver is requested to make sure no one is within the working
radius of the crane before operating crane.
CAUTIONS HIGH TEMPERATURE OIL WHEN WORKING WITH CRANE
When hydraulic oil temperature exceeds 80 degrees, high pressure hoses and seals can be damaged
by heat, and it may cause burn by spouted oil.
If temperature of hydraulic oil becomes over 80 degrees, stop operation and wait until the oil cools
down.
Continuous hook raising / lowering operation at high working lifting height and a long time accelerated
operation are easier to raise oil temperature. Especially be careful for these operations.
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