Furukawa Unic URW376C4U -T Series, Operation & Maintenance Manual

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11-7
HOW TO OPERATE CRANE
How to operate boom for derricking
(raising and lowering)
To raise
★
An abrupt crane operation while a cargo is being lifted up gives
an excessive shock to the crane which may cause the crane to be
damage or the crawler to be overturned.
Be sure to control levers slowly.
★
The longer the boom is extended, the faster a cargo is lifted
up and down by boom derricking operation.
Operate the boom so that a cargo can be lifted up slowly.
★
When lowering boom with a cargo hoisted, the working radius increas-
es which in turn decreases the capacity specified in the rated load chart.
Check the readings of load indicator to confirm the safety before the
boom is lowered.
Boom dericking lever
Boom
To raise
Boom
To lower
WARNING
Shift the lever to “ RAISE ” to raise the
boom.
Shift the lever to “ LOWER ” to lower the
boom.
To lower
To stop
Return the lever to neutral position to stop the
boom derricking.
◆
Power automatic accelerator
When the control lever is shifted further to
“
RAISE ” or “ LOWER ”, the engine speed
increases according to the movement of
the lever which in turn increases derricking
speed of the boom as the lever is interlocked
with the accelerator.
◆
Boom control together with accelerator
pedal
Engine changes from the idling to the highest
speed.
Operate the boom by controlling boom der-
ricking lever together with by adjusting the
accelerator pedal.