Bertolini LIGHT DUTY Serie Manual Del Usuario página 43

Tractor
Constant speed
universal joint
e) If the pump transmits the motion received from the cardan shaft to other devices (e.g. a fan
driven by an overdrive) by a through shaft, the inertial masses involved in the motion can be
considerable. Therefore the transmission only accepts very small speed oscillations so as to
prevent parts from breaking. In this sort of situation the previous instructions indicated at the
above points C and D must be strictly respected.
f) In case of working with unusual angles or big load it is recommended to fit, between the pump
and the cardan shaft, an additional transmission properly sized to relieve the axial thrusts.
g) The entire cardan shaft, i.e. both the joints and the telescopic shafts, must be kept constantly
lubricated, as recommended by the manufacturer.
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.
Choice of the safety guard to assemble on Bertolini pumps depends on two fundamental factors:
A)
The safety standards UNI EN ISO 4254-1 require the overlap between the pump safety guard
and that of the cardan to be "S = A - B"  50 mm;
B)
It is essential to be familiar with the specifications of the type of cardan shaft used.
In the market there are different kinds of cardan shafts with normal and wide an-
gled yokes, torque limiting devices and freely rotating wheels.
Since they are not standardised, the projections of their respective guards are ex-
tremely variable, so that is difficult to realize which is the correct safety guard to fit
on the pump to comply with the required overlap for safety purposes.
The following chart indicates the projection "A" of the safety guard compared to the junction of the car-
dan on the pump shaft
Simple cardanic joint
16°
42
Orchard sprayer