31
TURN OFF THE ENGINE BEFORE PERFORMING THE FOLLOWING OPERATIONS!!!
7.3 SENSING DEVICE SENSITIVITY ADJUSTMENT
The sensing device has to come into contact with the trunks in order to be able to carry out its own func-
tion: to locate the trunks and therefore retract the disc. The sensing device support has been arranged so
that the "return spring" can be replaced in order to avoid that the contact between the sensing device and
the trunk (particularly the trunk of young plants with a very delicate bark) can damage the plant itself.
The function of the return spring is to keep the sensing device rod in position when the tractor is opera-
tive; therefore the stronger the spring is, the stiffer the sensing device becomes with the possibility to
damage the bark of plants.
The inter-row is equipped with three springs:
A)
Spring
(wire
φ
2 mm) for young plants or plants with a delicate bark.
B)
Spring
(wire
φ
3 mm) to be used in most cases
C)
Spring
(wire
φ
3.5 mm) in case of very solid trunks.
To replace the return spring (
Fig. 18, pos. 7
), remove the safety lockpin (
pos. 8
), take off the
fl
at
washer, take off the spring and replace it with a spring more adequate to the kind of work you are
going to perform.
⇒
It is forbidden to remove the spring shown in the Fig. 18, pos. 9.
Fig. 18
