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4.4 WORK DEPTH
The depth at which the machine operates is determined by the
position of the two side skids (14 Fig. 1), depending on the differ-
ent configurations.
1) To adjust the work depth, remove the adjuster pin, raise or
lower the front skid to the required position and then fit the
adjuster pin back in place. This operation should be carried
out on both skids, depending on the type of soil.
4.5 IN WORK
Begin work with the PTO at full rate. Gradually dig the implement
into the ground. Do not depress the accelerator pedal too much
with the PTO engaged. To break up the soil to the required de-
gree, you must consider several factors, i.e.:
- the nature of the soil (medium consistency, sandy, clayey, etc.)
- the work depth
- the ground speed of the tractor
- optimum machine adjustment.
To level the soil or crumble it to a greater extent, the steerage hoe
is equipped with a rear casing whose opening can be adjusted by
means of a chain or, on request, by means of a rod with opposing
spring.
WARNING
The casing should be adjusted by keeping it raised to the great-
est possible extent so as to achieve correct levelling and pre-
vent clods and stones from being dangerously thrown beyond the
casing itself.
Adjustment to an excessive depth will result in high stress and
early wear, particularly with the spring rod type of regulation.
The soil is broken up by driving the tractor at a low speed, with the
levelling plate lowered and the tine rotor spinning at about 200
rpm. besides containing the clods that have already been broken
up by the tines, the levelling plate also achieves a well levelled
and homogeneous ground surface after the soil has been worked.
If the levelling plate is raised, the clods will not longer be broken
up and the soil will not be levelled.
4.5.1 HOW TO WORK
The levelling plate must be adjusted to suit the way the soil is to
be broken up. Now adjust the two side skids of the machine (14
Fig. 1), engage the PTO and begin to move forward with the trac-
tor, progressively lowering the steerage hoe.
Cover a short distance, then check to make sure that the work
depth, soil crumbling and ground levelling operations have been
carried out in the required way.
The speed of the tractor when the machine is operation must
not exceed 2-3 kph or components could be broken or dam-
aged.
The turning tines could throw up stones or other sharp ma-
terials as they work.
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CAUTION
CAUTION
DANGER
Constantly check to make sure that there are no bystanders,
children or domestic animals within the range of action of
the machine.
4.5.2 USEFUL TIPS
Depth too shallow
- Adjust the depth skids again.
- Advance more slowly. The tractor power could be insufficient.
- Further runs are needed if the soil is too hard.
- The tines roll over the soil instead of penetrating it: advance
more slowly.
Soil broken up too much
- Raise the levelling blade.
- Increase the ground speed.
Soil not broken up enough
- Lower the levelling plate.
- Reduce the ground speed.
- Do not work in soil that is too wet.
Rotor clogged
- Soil too wet to work.
- Raise the levelling plate.
- Reduce the ground speed.
- Do not work where the grass is too tall. If necessary, remove
any material that has built up at the sides of the rotor to prevent
overheating.
The machine jolts over the ground or vibrates
- Foreign bodies blocked between the tines.
- Tines incorrectly mounted without the helical positioning or that
penetrate into the soil with the blunt edge first.
- Worn or broken tines.
- Rotor misshapen owing to blows received during work from for-
eign bodies in the central part.
4.6 TINES
The tines with which the machine is equipped are suitable for
cultivation work in soil of normal consistency. Check the tines each
day to make sure they are not worn or broken. If the tines should
accidentally bend (or break) during work, they must be immedi-
ately replaced by mounting new ones in the identical position.
If several tines must be replaced, it is advisable to demount and
mount one tine at a time to avoid positioning errors.
The tines are available in different shapes:
- helical shaped for normal and tenacious soils;
- square shaped for loose and normal soils.
The cutting edge of the tines must always point in the same direction
as the rotor turns, according to the phase depicted in Fig. 1 ref. 7.
Tine replacement is a dangerous operation.
Proceed in the following way to replace the tines:
- Park the tractor on a flat surface with the machine hitched, then
raise the machine with the power lift;
- Insert two strong bearing stands at the sides of the machine;
- Lower the machine on to the stands, turn off the tractor engine
and apply the parking brake.
The heads of the bolts that fix the tines must by on the side
of the tines themselves while the nut and relative washer must
be on the flange side.
Comply with the driving torque values given in the table be-
low.
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DANGER
WARNING
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