Maeda MC815C, Руководство по эксплуатации, Страница: 360 / 426

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1. CAUTIONS IN USING FLY JIB
• A fly jib is attached to the main boom with 4 position pins. The angle of the fly jib is adjusted
by the derrick cylinder and the wire rope. If the wire rope is faulty due to the external damage
or incorrect maintenance, the fly jib may fall, causing a serious accident.
• When mounting a fly jib, be sure to disconnect the electric wires from the over-hoist detector
on the main boom side and reconnect them to the fly jib side. If the wires are not connected
correctly, the moment limiter or over-hoist detector will not function properly, causing a
serious accident.
• When using a fly jib, check that the actual number of fly jib boom sections and the displayed
number of fly jib boom sections on the moment limiter are the same, before start working.
Serious accidents such as damage of fly jib or overturn of machine might occur.
• When using a fly jib, remember to set the engine in an idling mode and work with a crane in a
slow speed. If you operate a lever in an sudden motion, the fly jib might break due to the
excess force, causing a serious accident.
• If you make an error in a fly jib operation, the fly jib might fall due to the bracket deformation
or a crack on the welded section. Remember to check each part of a fly jib and make sure
there are no deformation or cracks on the welded section.
• Fly jibs are attached and stowed to the main boom with three position pins. Please check that
all three position pins are correctly inserted and tightened securely by a linchpin before start
moving. If the position pin comes off, the fly jib may fall, causing a serious accident.
• When stowing a fly jib, be sure to disconnect the electric wires on the fly jib side and
reconnect them to the over-hoist detector on the main boom side beforehand. If the wires are
not connected correctly, the moment limiter or over-hoist detector will not function properly,
causing a serious accident.
• This manual assumes that a fly jib is attached to the main body.
To remove a fly jib from the body, changing the setting of the moment limiter is necessary, so
please contact our sales service agent. If you remove a fly jib from the body and use the
machine without changing the moment limiter setting, damage or overturn of the machine
might occur causing a serious accident.
• See “Safety” section for the safety precautions that are not provided in this section.
CAUTION
• Mass of the machine varies depending on the
specification.
The figure on the right shows the weight table for
weight of standard vehicles and the additional weight
of each accessory unit.
• The fly jib angle can be changed between 0 and 60 degrees.
When using a fly jib, perform crane operations with the main boom angle in the range of “50
degrees or more”.
In the following conditions, the moment limiter issues an overload alarm and the crane
operation is disabled.
• The main boom angle is in the range of “50 degrees or less”, and the main boom length is
“6.1 m or more”.
• The main boom angle is in the range of “50 degrees or less”, and the main boom length is
“6.0 m or less” but a load is on the hoist.
• The main boom angle is in the range of “50 degrees or more”, and it is overloaded
exceeding the rated total load.
However, when the boom length is “less than 6.0 m” with no load hoisted, the moment limiter
does not issue an overload alarm.