Maeda MC-174CRM, Operation Manual

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5. Refer to "Operation 2.15 Operations before Crane Operations"
and slacken the wire rope which fixes the hook block (10) to
release it from the hook holder (9), according to the procedure
for it.
6. Turn the acceleration lever toward left to operate the engine at
medium speed (lever stroke about midway).
7. Operate the boom derricking lever (4) slowly forward/backward
and move the derricking cylinder up/down until it reaches the
stroke end. Check if there is any abnormality with the operation.
If there is any abnormality, repair.
8. Operate the boom telescoping lever (2) slowly forward/
backward to extend/retract the boom until it reaches the stroke
end. Check if there is any abnormality with the operation.
If there is any abnormality, repair.
9. Operate the winch lever (3) slowly forward/backward to check if
the hook block is smoothly raised/lowered. Also check if the
hook block immediately stops and the winch drum does not wind
into a mess when the winch lever returns to the NEUTRAL
position. If there is any abnormality, repair.
10. Operate the slewing lever (1) slowly forward/backward to
check if the crane smoothly slews clockwise and counter
clockwise for 360 degrees or more. Also check if the crane stops
immediately when the slewing lever returns to the NEUTRAL
position.
If there is any abnormality, repair.