FUNCTION
TRAVEL MOTOR
3
3
TRAVEL MOTOR 3M0AX00
Swash plate
As shown in the figure, the swash plate (5) has three
planes, A, B and C, and is mounted to the flange holder
(6) such that its angle of inclination with respect to the
flange holder (6) can be changed using the two steel
balls (7).
The swash plate control piston chamber (3) is connected
to the tank port when the 2-speed control valve is
switched to the 1st-speed side. In addition, the swash
plate (5) is stabilized at surface “A” by the forces of the
piston assembly (8) and the springs (9) and (10), result-
ing in the swash plate being oriented at an angle, á,
which enables the motor to run in 1st-speed (low speed).
The swash plate control piston chamber (3) is connected
to the motor drive pressure port when the 2-speed con-
trol valve is switched to the 2nd-speed side. In addition,
the swash plate (5) is stabilized at surface “B” due to the
equilibrium between the force of the springs (9), (10) and
the force of the 2-speed control piston (11), resulting in
the swash plate being oriented at an angle, , which en-
ables the motor to run in 2nd speed (high speed).
When the engine is stopped, the pilot pressure of the 2-
speed control valve is cut off, which causes the swash
plate (5) to be stabilized at surface A at an angle of incli-
nation, á, resulting in the control valve being moved to
the 1st-speed side by the force of the springs (9) and
(10). Because of this, the motor is always set to the 1st-
speed setting when the engine is started.
Automatic 2-speed switching
When the size of the load applied to the travel motor dur-
ing travel operation in 2nd (high) speed increases, the
hydraulic pressure passing through the passage (1) from
the counterbalance and working on the valve (2) increas-
es. This causes the valve (2) to move to the left. Once the
valve (2) is moved to the left, the pressure oil that has
been flowing through the shuttle valve (12) and the valve
(2) to work on the piston (11) then flows into the tank pas-
sage. The piston (11) returns to its prior position, and the
motor is switched to 1st (low) speed.
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