Hydraulic system
The hydraulic system for three-point rear
attachment control is equipped with power
governor
, which ensures system operation
in the following modes:
• power control;
• position control;
• height control.
Power and position control
The power/position control makes the sys -
tem sensitive to variation of operating con-
ditions. Effective application of these
modes depends on the unitized machines
and land conditions.
Position control
It provides the accurate and sensitive moni -
toring of the position of the attached
equipment like spraying machine, leveller
and others above the ground. The position
c o ntrol can be used with the tillage ma -
chines, semi-hookup ploughs with external
cylinders, etc. However, it is not recom -
mended to use this control on uneven fields
when using the tillage machines and im -
p l ements.
Hydraulic lift (if installed)
The HMS with hydraulic lift provides for op -
eration in the following modes:
• lifting the RMA and lowering it under its
own weight;
• position control;
• power control;
• combined control (adjusting the cultiva-
tion depth according to the soil condi -
tion with limiting the maximum depth by
the position control).
Th e MTZ tractors with index “.2” are
equipped with RMA hydraulic lift and do
not have power governor
Power control
It is the most suitable mode for operation
with mounted implements, the working
parts of which are deepened into the soil.
The system is sensitive to traction effort var -
iation (caused by the changes in the soil re -
sistance or soil tillage depth) via central rod
of the hitch mechanism. The hydraulic sys -
tem responds to these changes by lifting or
lowering the implement to maintain the giv -
en tractive force at constant level. The sys -
tem reacts to the compressing and stretch -
ing forces in the central rod, i.e. is a dual-
action system.
Height control
When tilling the soil with greatly varying
density and resistance, and uneven sur -
face, if the power o r position control does
not ensure satisfactory tillage quality ac -
cording to land treatment requirements, it is
recommended to use the height control
(using the implements with supporting
wheels).
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