ENGLISH – 13
3.10 BOOM BALANCING
The boom balancing operation is used to nd the best balance
between the overall weight of the boom, inclusive of the installed
accessories, and the force opposed by the tension of the balanc-
ing spring.
To verify the spring tension, proceed as explained below.
For models WIDE S ("Figure 27")
1. unlock the gearmotor with the relevant key provided (refer
to the “Manually unlocking and locking the gearmotor”
paragraph)
2. manually move the boom to about half-way (45°) and leave
it stationary
3. if the boom tends to rise, reduce the tension of the spring
by moving the lower part towards the opening direction. On
the other hand, if the boom tends to fall, increase the tension
by moving the base of the spring away from the opening
direction.
45°
45°
27
4. repeat the operation by positioning the boom also at roughly
20° and 70°. If the boom remains stationary in its position,
it means that it is correctly balanced; a slight imbalance is
allowed, but the boom must never move substantially
5. lock the gearmotor.
For models WIDE M, WIDE L ("Figure 28")
1. unlock the gearmotor with the relevant key provided (refer
to the “Manually unlocking and locking the gearmotor”
paragraph)
2. manually move the boom to about half-way (45°) and leave
it stationary
3. if the boom does not stay in position, loosen nut (A) on the
spring
4. if the boom tends to rise, reduce the tension of the spring by
turning the stretcher (B) anti-clockwise. On the other hand, if
the boom tends to fall, increase the spring tension by turning
the stretcher (B) clockwise.
45°
45°
A
B
A
B
28
5. repeat the operation by positioning the boom also at roughly
20° and 70°. If the boom remains stationary in its position,
it means that it is correctly balanced; a slight imbalance is
allowed, but the boom must never move substantially
6. tighten nut (A) for the spring
7. lock the gearmotor.
3.11 MANUALLY UNLOCKING AND LOCKING THE
GEARMOTOR
The gearmotor is equipped with a mechanical unlocking system
that allows for opening and closing the boom manually.
These manual operations should only be performed in case of a
power outage, malfunctions or during the installation phases.
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