Maeda MC405C-3 - Acceleration Operation; Slewing Operation

Mini-Crawler Crane M A E D A Section 4 – CRANE OPERATION
1/2019 MC405C-3 4-65
Slewing Operation
WARNING!
• Check the safety around and honk the horn
before slewing.
• Operate the slewing lever as slowly as
possible.
Start smoothly, slew at low speed, and stop
gently.
Sudden lever operation especially while
hoisting a load will cause the load to slew,
causing the loss of stability in the machine,
and thus may break the crane or overturn
the machine.
• Even if the outriggers are set normally,
some directions have lower stability when
slewed for 360 degrees. Be extremely
careful when slewing while hoisting a load.
• Depending on how outriggers are extended,
the hoisted load may hit an outrigger during
the slewing operation, breaking the crane or
overturning the machine. Be careful not to
let the hoisted load hit an outrigger.
Fig. 4-166
Operate the slewing lever (1) as follows.
Fig. 4-167
• Slew counterclockwise (left): Push the lever
forward to the "LEFT" side.
• Neutral: Release your hand from the lever.
The lever returns to the "Neutral"
position and the slewing stops.
• Slew clockwise (right): Pull the lever toward you
to the "RIGHT" side.
NOTICE: Adjust the crane slewing speed with the
slewing lever and the stroke of the acceleration
pedal.
Acceleration Operation
WARNING! Accelerating the operation speed
of the crane units more than is necessary is
dangerous.
CAUTION: Decrease the speed in the
beginning or near the end of an operation.
Change the speed to low speed or high speed
according to the load.
Operate the acceleration pedal (6) as follows.
Fig. 4-168
• Low idling: Release your foot from the pedal.
The engine speed decreases and
the operation speed of the crane
units slows down.
• Full speed: Fully step on the pedal.
The engine speed increases, and
the operation speed of the crane
units accelerates.
NOTICE: Step on the pedal to the position of the
engine speed necessary for the task.