Oleo-Dynamic Blower Drive; Dependent System - Gaspardo PRIMAVERA 400 Manuel D'emploi Et Entretien

ENGLISH

3.6.2 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 inconve-
niences 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 repai-
red 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
fi rst 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.
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 oleo-dynamic 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 suffi cient number of distributors on the tractor: the supply
to the blower drive has maximum priority.
- Tractor oil fl ow rate: the oil required for engaging the blower is
approx. 32 litres/minute with a max. pressure of 180 bar.
- For correct blower operation and suffi cient oil cooling we recom-
mend supplying the circuit with an amount of oil equal to 55÷60
litres.
- 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 modifi cations carried out by the tractor
dealer.
- Oil supply: follow the data of the table in Fig 34. The hydraulic
pipes must be connected correctly to the tractor distributors
following the instructions on each pipe.
56
USE AND MAINTENANCE
Working description
The oil fl ow 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 fl ow pressure shown on the
manometer (Table 4).
The system is equipped with a safety valve that allows the blower
to continue turning by inertia even after the system has been di-
sengaged or when there has been a sudden failure of the system.
The return circuit, which can have a radiator incorporated (on re-
quest), 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 fi lter;
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 fl ow rate pump (closed hydraulic circuit),
equipped with oil fl ow rate regulator, open the three-way regulator
completely (B, Fig. 34) and, starting with a low oil fl ow rate, gradual-
ly open the internal regulator of the tractor circuit until the required
pressure is reached as shown by the pressure gauge (C, Fig. 34).
A- quick-coupling pressure
side;
B- three-way regulator;
C- manometer;
D- engine;
E- safety valve;
F- quick-coupling scavenge
side;
G- cooler (optional).
fi g. 34
A - tank;
B - multiplier;
C - pump;
D - three way regulator;
E - monometer;
F - engine;
G - safety valve;
H - cooler;
I - fi lter.
fi g. 35

C
B
A
Tractor side
E
D
B
D
E
G
F
F
G
H
C I
A
cod. G19503101