Palfinger PK 23002, Operator'S Manual

Page: 43 / 94

During crane operation 4.1-3
When the main boom is below the horizontal line (area A) the
maximum lifting power is not reached. Therefore this arm position
should be avoided. If you anyway work in this position, please
note that the maximum lifting power of the crane cannot be
applied.
In some craned the hinged arm can be extended over the main
boom angle. In the upper movement range (area B about 60°) it is
not allowed to use this hinged arm position as working position.
A
B
When working with loads the boom must not be moved to the end stop
as in this position the overload safety device is not operational.
If the loading activity is interrrupted the load arm is to be retracted, the hydraulic pump switched off and
the crane secured against unauthorised operation.
In order to continue working safely after an interruption of loading activity, check whether the crane has
been tampered with before resuming operation.
4.1-3 Maintain load limits
Never exceed the load moment permissible for the crane. This
can lead to uncontrolled sinking of the load and to failure
(fracture) of components or to tipping over.
The permissible lifting capacities and the maximum load can
be found on the lifting capacity plate.
By working with the smallest possible radius you will increase
the safety and service life of your crane.
When lowering the load from a steep position the outreach must not
be increased as this can cause the maximum permissible load
moment to be exceeded. If this happens on cranes without an
overload safety device or with an overload indicator uncontrolled
lowering of the load occurs. On cranes with an overload safety
device the stopping of the descending movement can cause the
load to slip, and the crane is subjected to unnecessary loading. For
a description of safety devices see Chapter 4.2.