Use With Agricultural Machines - Bertolini GIARDINAGGIO Serie Manual De Uso Y Mantenimiento

3.5

Use with agricultural machines

WARNING!
All rotating parts must be protected. The tractor and pump guards form an
integrated system with the cardan shaft guard. Carefully read the manual supplied
with the cardan shaft.
There are two possibilities of choosing the right type of cardan shaft and the way in which it
is used:
1. If the cardan shaft is merely used to operate the pump, greater differences between the
two joint angles (α1 and α2) can be accepted, thus a somewhat irregular motion, as
illustrated in the specialized catalogues.
2. If the pump transmits the motion received from the cardan shaft to other devices (e.g. a
fan driven by an overdrive) by means of a through shaft, the inertial masses involved in
the motion can be considerable. In this case, the transmission only accepts very small
speed oscillations so as to prevent parts from breaking. The following rules must be
strictly respected in this sort of situation:

A shaft with two single joints can only be used when the difference between
angles α1 and α2 is no more than 12°.

If the difference between the two angles α1 e α2 is >12°, use a cardan shaft
with a constant speed universal joint and a single joint.
Cons speed
universal joint
In this sort of situation, it is necessary to remember that the difference between
angles α1 e α2 of the single joint must never exceed 12°. If this occurs, another
constant speed universal joint must be added.
During the curve in operating conditions, cardan shafts lead to the creation of axial thrusts
on the shafts to which they are connected. These forces may actually break parts of the
pump. To keep them within acceptable limits, the entire cardan shaft, i.e. both the joints
and the telescopic shafts, must be kept constantly lubricated, as described by the
manufacturer.
In the maximum curve condition, also make sure that the cardan shaft never becomes
completely closed, since this would certainly break parts of the mechanism.
Tractor
Mist blower
Tractor
Mist blower
63