19
5 OPERATIVE INSTRUCTIONS
5.1 Description of manoeuvres
ATTENTION
: all lifting operations must
be performed by qualified and
authorised personnel only.
The number shown in brackets refer to the
“Set maps”.
5.2 Important recommendations for correct device installation
5.2.1 Preliminary information
In order for the device to function correctly, connections to the truck’s hydraulic system must be performed
perfectly. In order to facilitate this task, a list of information that will help correct installation is given below.
It should be pointed out that
back pressure
in closure, which is shown on the tube opposite that under
pressure,
must not exceed 20 bar
. Back pressure exceeding this limit will jeopardise device performance. In
the event of malfunctions, the first check to make is that of the back pressure.
Cascade Italia recommends that the following hydraulic capacities and working pressures be
observed in order to optimise device functioning and to avoid problems during operation or start-up.
The values shown below are to be considered a rough guide and can vary from one device to another.
Class of hook
ISO 2328
Nominal truck capacity
(Kg)
Load’s centre
of gravity
Recommended
hydraulic capacity (l/min)
Recommended
working pressure
(BAR)
Min
Med
Max
Max
1
Up to 999
400
10
15
25
150 *
2
from 1000 to 2500
500
15
30
50
150 *
3
from 2501 to 4999
500
20
40
60
150 *
4
from 5000 to 8000
600
45
60
80
150 *
5
from 8000 to 10999
600
60
80
100
150 *
*) Pressure values valid unless shown otherwise on the device’s plate (and EC certificate).
5.2.2 Scaling the hydraulic system
In addition to the pressure and hydraulic capacity
values sent by the truck, correct device functioning
depends on the type of supply system used
between the truck distributor and the device. The
fundamental parameters that influence device
behaviour are the diameter and length of the
tubing, for example, tubes with a diameter that is
too small compared to the relative length and to a
given capacity can cause excessive load losses
that jeopardise the correct functioning of the truck-
device system.
The connection hoses are scaled according to the
capacity actually supplied by the truck to activate
the device and the length of the relative tubing.
The difficulty of creating a perfect hydraulic system
in other words, one that complies with the laws of
hydraulics, is obvious, as it would provide tubing of
an excessive diameter and a very bulky system
that would be very difficult to obtain. The next
paragraph contains a table with the absorption
values for the various tube dimensions, lengths
and hydraulic capacities. This table may help the
operator who prepares the system that links the
truck to the device to install a system that has the
correct dimensions and is optimal for system
functioning, in other words, one that is capable of
obtaining back pressures of approximately 20
bar
.
