B22W-202010
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CHAPTER 4 HST SYSTEM1022H TRACTOR
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3. BACKWARD (LEVER : a side)----------------------
-----------------------------------------------Figure-g
The operation principle is the same as the above
FORWARD operation.
In case of tilting the LEVER to the direction of 'a' and
tilting the LEVER above the tapper angle of moving
Swash Plate, pump starts to discharge oil and supply
motor with oil, and output shaft rotates. Output rotation
is directed to the CCW when seeing it from VIEW, the
position of output shaft. <Figure-h>
2. FORWARD (LEVER: b side )------------------------
--------------------------------------------- Figure-e
In case of rotating the input shaft of HST to the CCW
direction and tilting LEVER from its neutral position to
the direction of 'b': When the LEVER is at a minimum
inclination angle, pump does not work not to make
a volumetric difference of inner cylinder. If tiling the
LEVER above the taper angle of moving Swash Plate,
Pump starts to run and supply motor with oil, and
output rotation is directed to CW when seeing it from
the VIEW that position of output shaft.<Figure-f>.
And Relief Valve is usually closed. If the output shaft
of motor is overloaded and pressure inside the HST
circuit is over 210bar, Relief Valve works to prevent
the damage of each equipment.
In this case, energy is all transformed to heat and
oil temperature inside the HST Circuit rises sharply.
So operation of Relief Valve has to last just for as a
short time as possible (Within 30 seconds). Oil that
has already passed through Relief Valve is owed into
low-pressure circuit.
K19W089A
Figure-e
K19W090A
Figure-f
K19W091A
Figure-g
K19W092A
Figure-h
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