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6. Operate the right control lever (1) slowly right and left
and move the derrick cylinder up and down until it
reaches the stroke end while checking if there is any
abnormality with the operation.
Repair if any abnormality is found.
7. Operate the left control lever (2) slowly back and forth,
and repeat extension and retraction of the boom until it
reaches the stroke end while checking if there is any
abnormality with the operation.
Repair if any abnormality is found.
8. Operate the right control lever (1) slowly back and forth
to check the following: the hook block is smoothly
wound/unwound, the hook block immediately stops
when the right control lever is shifted back to the
“NEUTRAL” position, and irregular winding does not
occur in the winch drum.
Repair if any abnormality is found.
9. Operate the left control lever (2) slowly back and forth
to check the following: the crane smoothly slews 360
degrees or more clockwise and counterclockwise, and
the crane stops immediately when the left control lever
is shifted back to the “NEUTRAL” position.
Repair if any abnormality is found.
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