Maeda MC405C-3 - Boom Derricking Operation; Boom Telescoping; Hook Raising and Lowering Operation

Section 4 – REMOTE CONTROL OPERATION Mini-Crawler Crane M A E D A
4-122 1/2019 MC405C-3
Boom Telescoping
Fig. 4-360
Boom "Extending"
Push the Boom telescoping/No.2 outrigger
operation lever to "Extend (upper)", then pull the
Accelerator lever slowly.
The boom extends.
Boom "Retracting"
Push the Boom telescoping/No.2 outrigger
operation lever to "Retract (lower)", then pull the
Accelerator lever slowly.
The boom retracts.
Stop Telescoping
Release the Accelerator lever slowly, then next
release the Boom telescoping/No.2 outrigger
operation lever to return it to the neutral position.
The boom stops telescoping.
Hook Raising and Lowering Operation
WARNING!
• In the event of "Over-winding alarming" or
"Automatic cut out" during the hook raising
operation, immediately suspend winding.
Otherwise, it may cause a damage to the
Crane, or the wire-rope is broken which
result dropping off the hook or load; a
serious accident may happen.
• Continuing the hook lowering in the
condition that the load already reached the
ground, the random wind of the wire-rope
will happen. This may damage the wire
rope or shorten its life badly. Further, there
is some risk that the wire-rope may bite
itself which prevents any more winching.
During the hook lowering, always take good
care not to cause such random wind.
• The hook is raised or lowered by the boom
telescoping or derricking, as well.
The same attention must be paid as the
hook raising and lowering by the winch
operation.
Fig. 4-361
Hook Raising
Push the Hook raising and lowering/No.2
outrigger operation lever to "Raise (upper)", then
pull the Accelerator lever slowly.
The hook starts to be raised.
Hook Lowering
Push the Hook raising and lowering/No.2
outrigger operation lever to "Lower (lower)", then
pull the Accelerator lever slowly.
The hook starts to be lowered.
Stop Raising or Lowering
Release the Accelerator lever slowly, then
release Hook raising and lowering/No.2 outrigger
operation lever to return it to the neutral position.
The hook stops raising or lowering.
Boom Derricking Operation
Fig. 4-362
Boom Raising
Push the Boom derricking/No.4 outrigger
operation lever to "Raise (upper)", then pull the
Accelerator lever slowly.
The boom is raised.