MTZ 1220.1/1220.3
Section D. Construction and Operation
D34
Front PTO control mechanism
The front PTO is controlled by means of the
electro-hydraulic system.
The electric part of the front PTO con-
trol system is incorporated in the integrated
system for controlling the real axle DL (differ-
ential lock), FDA (front driving axle) drive and
front PTO. It consists of the switch (3),
pushbutton (4), pilot lamp (5) and relay, which
are arranged in the control panel (2) (fig. E-23)
located in the cab to the right from the operator
and interconnected by means of the cab bun-
dle (1) (that of the integrated system for con-
trolling the DL, FDA and front PTO) according
to the attached electric diagram. This bundle
is connected with the transmission bundle (6)
(that of the integrated system for controlling
the DL, FDA and front PTO), which is con-
nected, in turn, to the electro-hydraulic dis-
tributor (7) for switching on the front PTO
drive.
The system if supplied with power
from the on-board power system according to
the attached electric circuit diagram. The sup-
ply voltage is applied to the system after start-
ing the engine.
The electro-hydraulic distributor (7)
controls the oil flow delivered to the hydraulic
cylinder of the control mechanism of the
band brakes of the front PTO epicyclical re-
duction gear. The switch (3) has two fixed
positions:
-
Engagement of the front PTO drive (press
the smooth portion of the switch);
-
Disengagement of the front PTO (press the
corrugated portion of the switch).
To engage the drive of the front PTO,
it is necessary to set the switch (3) to the po-
sition “Engagement of the front PTO drive”
with the engine running and then press the
pushbutton (4) for starting the front PTO and
release the same. When doing this, the con-
tacts of the relay in the control panel (2) get
closed and the electromagnet of the electro-
hydraulic distributor (7) is energized, the slide
of the electro-hydraulic distributor (7) moves
and oil is delivered to the rod-free cavity of
the hydraulic cylinder for controlling the front
PTO, and the rod cavity is connected with the
drain.
The engagement of the front PTO
drive is signaled by means of the pilot lamp
(5) (fig. E-23).
To disengage the front PTO, it is nec-
essary to set the switch (3) to the position
“Disengagement of the front PTO (press the
corrugated portion of the switch). When doing
this, the contacts of the relay in the control
panel (2) get open, the electromagnet of the
electro-hydraulic
distributor
(7)
is
de-
energized, the slide returns to the initial posi-
tion, the rod-free cavity of the hydraulic cylin-
der is connected with the drain, oil is deliv-
ered to the rod cavity, the front PTO drive is
disengaged and the pilot lamp (5) goes out.
When stopping the engine, the front
PTO is disengaged automatically. Therefore,
to engage the front PTO drive after the next
starting of the engine, it is necessary to press
the pushbutton (4) (repeat the operations for
engaging the PTO).
Fig. D-23. Front PTO control mechanism.
1 – bundle; 2 – control panel; 3 – switch; 4 – pushbutton; 5 – pilot lamp; 6 – bundle; 7 – electro-hydraulic dis-
tributor
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