FUNCTION
TRAVEL MOTOR
2
3
TRAVEL MOTOR 3M0AX00
When the high-pressure oil that is directed to the port P1
is shut off, the pressure in the port P1 becomes equal to
that in the port P2 and the spool (8) attempts to return to
the neutral position using the force of the spring. This
pushes the oil in the chamber B out to the port P1 side.
At this time, the oil flow is narrowed down at the orifice
(9), resulting in the spool (8) being slowly returned to the
neutral position. In this way, the motor can thus be shut
down without being affected by shocks as they are ab-
sorbed.
2-speed mechanism
2-speed control valve
The pressure in the chamber C is low when the high-
pressure oil is directed to the motor port M1 and the trav-
el 2-speed solenoid valve (1) is at the 1st speed side po-
sition because the chamber C is connected to the tank
passage via the 2-speed solenoid valve (1). This causes
the spool (2) to be pushed to the left by the spring (4) and
the piston chamber (3) that controls the swash plate to
become connected to the tank port (T). There is no force
pushing the swash plate (5) upward at this time.
When the 2-speed travel solenoid valve (1) is switched to
the 2nd-speed position, the pressure oil from the 2-
speed travel solenoid valve (1) flows into the chamber C,
which causes the spool (2) to move to the right. Once the
spool (2) is moved to the right, the motor port M1 is con-
nected to the port A and the motor port M2 to the port B.
This causes the pressure oil from the motor port M1 to
move the shuttle spool (12) to the right and to flow into the
piston chamber (3) of the piston that controls the swash
plate. The control piston (11) then operates to push the
swash plate (5) upward.
Since there is no pressure oil supplied while the engine
is stopped, the spool (2) is then returned to the 1st-speed
position by the spring (4).
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