Posi-Plus Line Runner 700-40, Руководство оператора

Страница: 28 / 34

Oct-18-700 Operation Page 28 of 34
Section 7 - Protection systems
Limitations of protection systems
The Line Runner 700 aerial device is equipped with protection systems that are intended
to protect the machine from being overloaded due to operator errors. However, even with
these protection systems, the unit can be damaged if the operator disregards the
recommended methods and procedures described in this manual.
Boom stow protection
The boom stow protection system prevents damage to the chassis when the boom is
lowered on the boom rest. An adjustable limiting valve is provided in the electro-hydraulic
section valve that controls the lower boom cylinder. So when the boom is positioned on
the boom rest, it is not possible to reach the maximum operating pressure of the unit.
ATTENTION: this system doesn’t protect against boom speed, operate slowly when
stowing the boom on its rest.
Side load protection
The side load protection system helps prevent damage to the aerial device structures
when a side load is developed on the booms. Side load may be caused for example
when using the pulling eye without having the booms directly over the load.
If an excessive side load is developed on the booms, the gearbox and rotation motor will
back drive and the rotation brake will slip. This allows the booms to side slip, or rotate
toward the load.
Operate the unit in a manner that avoids developing a side load on the booms. Do not
rely on the side load protection system to prevent side loads from developing on the
booms. The system is intended to protect the aerial device from excessive side loading
due to operator error. Each time the side load protection system operates, the aerial
device is subjected to an overload. Repeated overloads could cause fatigue failure of the
machine components.
Caution
Excessive side loading of the booms during aerial device operation should be
avoided. The booms should be rotated toward the load rather than depending upon
side load protection. Side loading can result in damage to the structures or the
rotation system and may adversely affect vehicle stability.
Attention
Never attempt to counteract the side load protection system by shifting the rotation
function of the single handle upper control in the opposite direction of the side slip.
Attempting to override the side load protection system will cause increased side
loading of the booms.