Gaspardo PINTA-Serie Gebrauch Und Wartung Seite 42

ENGLISH
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; 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 23. The hydraulic
pipes must be connected correctly to the tractor distributors
(see chapter 3.1) 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 5).
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
completely (B Fig. 23) 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. 23).
42
USE AND MAINTENANCE
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. 23
g
C
B
A
Tractor side
D
E
G
F
cod. 19502490