Gaspardo PA1 GRINTA Emploi Et Entretien page 52

ENGLISH
3.5 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.
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.
3.5.1 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 flow rate: the oil required for engaging the blower is
approx. 32 litres/minute with a max. pressure of 150 bar.
- For correct blower operation and sufficient oil cooling we
recommend 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 modifications carried out by the tractor
dealer.
- Oil supply: follow the data of the table in Fig. 30.
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ATTENTION
USE AND MAINTENANCE
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 4). 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 variable-delivery pumps (closed hydraulic circuit),
fitted with an oil delivery regulator, first open the three-way
regulator «B» completely and, starting with little oil pressure,
open the internal regulator gradually until the pressure required
is reached. This is indicated on the pressure gauge «C» (see
paragraph 3.5.3).
A - q u i c k - c o u p l i n g
pressure side;
B - three-way regulator;
C - manometer;
D - engine;
E - safety valve;
F - q u i c k - c o u p l i n g
scavenge side;
G - cooler (optional).
Tractor side
fig. 30
g
D
C
E
B
A
cod. G19502171
G
F