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4.3 BLOWER DRIVE
4.3.1 POWER TAKE-OFF RPM
The blower pump is enabled by the tractor power take-off. It is
important that the rpm indicated are respected. If the minimum
rpm is not reached the machine could lose distribution precision
and where there are large quantities of seeds, the granulate
pipes could get clogged.
ATTENTION
Driving a vehicle with a 540 rpm propulsion, with a power take-
off of 1000 rpm and an engine rpm correspondingly low is not
permitted. Danger of blower pump breakage. During
distribution do not let the power take-off rpm drop too low.
4.3.2 OLEO-DYNAMIC BLOWER DRIVE
Safety
The equipment is suitable only for the use indicated. Any use
other than that described in these instructions can cause
damage to the machine and constitute a serious danger to the
user.
Regular operation depends on the correct use and adequate
maintenance of the equipment. It is advisable therefore to observe
scrupulously what is described in order to prevent any
inconveniences that could prejudicate proper operation and
duration. It is just as important to keep to what is described in
this booklet since the Manufacturer declines all responsibility
due to negligence and non-observance of these rules.
At any rate the Manufacturer is available to assure immediate
and accurate technical assistance and all that may be necessary
for the improved operation and better performance of the
equipment.
The oleo-dynamic blower drive may be used, maintained and
repaired only by personnel with complete knowledge of the
apparatus in question and of the relative dangers. Check the
correct connection of the quick-couplings; failure to do so could
result in damage to the system. Disconnect the oleo-dynamic
unions only after having first depressurized them.
ATTENTION
High-pressure oil leaks can cause serious skin injuries with the
risk of infection. In such cases seek immediate medical attention.
It follows that oleo-dynamic components should not under any
circumstances be installed in the tractor cabin.
A- quick-coupling pressure side;
B- three-way regulator;
C- manometer;
D- engine;
E- safety valve;
F- quick-coupling scavenge side;
G- cooler (optional).
fig. 61
Tractor side
cod. 19502240
D
E
C
B
A
F
USE AND MAINTENANCE
All the component parts of the pressurised system should be
carefully installed in order to avoid damage during the use of the
machinery.
There are two types of oleodynamic system for the blower drive:
a) dependent system: connected to the tractor's system.
b) independent system: a system with a self-contained oleo-
dynamic system.
DEPENDENT SYSTEM
Characteristics of the tractor necessary for installation:
- A sufficient number of distributors on the tractor: the supply
to the blower drive has maximum priority.
- Tractor oil delivery: the blower drive needs an oil delivery of
about 32 litres per minute, with pressure max. 150 bar; the
delivery of the tractor pump should be at least double that.
- Oil cooling: if the tractor is not equipped with a large enough
cooling system, it will be necessary:
a) to install one;
b) increase the oil reserve by means of a supplementary tank
(ratio: 1:2 between the pump delivery/minute and the oil reserve).
- The return circuit must be low pressure (max 10 bar).
- Do not connect the return circuit to the auxiliary distributor.
- Tractors: check the tractor according to the above observations.
If necessary have any modifications carried out by the tractor
dealer.
- Oil supply: follow the data of the table in Fig 61. The hydraulic
pipes must be connected correctly to the tractor distributors
following the instructions on each pipe.
Working description
The oil flow necessary to drive the blower, is taken from the tractor
distributor, through a pressure tube to a three-way regulator. The
rotational speed of the oleo-dynamic motor, and therefore that of
the blower, is proportional to the flow pressure shown on the
manometer (Table 6). The system is equipped with a safety valve
that allows the blower to continue turning by inertia even after the
system has been disengaged or when there has been a sudden
failure of the system.
The return circuit, which can have a radiator incorporated (on
request), must be low pressure (max 10 bar) otherwise the oil-
seal of the oleo-dynamic motor will be damaged. We recommend
that a 3/4 inch return pipe is connected to the tractor's oleo-
dynamic system scavenge union in the following way:
a) The return oil must pass through the filter;
b) The return oil must not pass through the distributors but
through a low-pressure return circuit (scavenge).
For further information contact the manufacturer of the tractor.
Starting up
With the engine off and the tractor immobilized, connect correctly
all the quick-couplings. Start the engine and operate the system
at idle for a few minutes bringing constant pressure to the entire
circuit in order to avoid instability of the blower. It is possible to
regulate the pressure only when the oil has reached the right
temperature and the blower does not present changes of speed.
If the equipment is used with more than one tractor and,
consequently, different distributors and oils, it will be necessary
to repeat the calibration procedure for each tractor.
In tractors with a variable flow rate pump (closed hydraulic circuit),
equipped with oil flow rate regulator, open the three-way regulator
G
completely (B Fig. 64) and, starting with a low oil flow rate,
gradually open the internal regulator of the tractor circuit until the
required pressure is reached as shown by the pressure gauge
(C Fig. 61).
g
ENGLISH
65
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