Maeda MC-305C-2 - Boom Telescoping Operation

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2.20 BOOM TELESCOPING OPERATION
• Operate the boom telescoping lever as slowly as possible.
Sudden lever operation especially while hoisting a load will cause the load to swing, giving a
great impact to the machine, and thus may break the crane or overturn the machine.
• Do not pull the load horizontally or pull in the load by telescoping the boom.
• Extending the boom increases the working radius and the rated total load that can be hoisted
decreases. Be extremely careful so that the load weight will not be overloaded with the boom
most extended when working by telescoping the boom.
• When the boom is extended, the hook block is raised.
If the alarm buzzer of the over hoist detector and the audible message of “Hook Over Hoisted”
are heard during the boom extending operation, return the boom telecsoping lever
immediately to the “NEUTRAL” position and stop the boom extending operation.
CAUTION
• The hook block is raised or lowered while telescoping the boom. Perform the winch operation
at the same time to adjust the hook block height.
• When the boom is maintained extended for a long time, the boom slightly retracts due to the
temperature change in the hydraulic oil. In this case, extend the boom as needed.
Perform the boom telescoping lever (2) as follows.
• Extend: Push the lever forward to the “EXTEND” side.
• Neutral: Release your hand from the lever.
The lever returns to the “NEUTRAL” position and the
boom telescoping stops.
• Retract: Pull the lever toward you to the “RETRACT” side.
NOTES
Adjust the boom telescoping speed with the boom telescoping
lever and the stroke of the acceleration pedal.