FUNCTION
SLEW MOTOR
3
3
SLEW MOTOR 3N0AX00
Brake valve
This valve is equipped with a shockless function.
When the high-pressure oil enters the port Av, it flows
through the orifice (1) and into the damper chamber (2)
where it attempts to move the plunger (3) to the right. At
this time, the spring (4) remains in its set position.
When the pressure in the pressure oil increases to where
it overpowers the spring force of the spring (4), the
plunger (3) is moved to the right. This causes the pres-
sure in the pressure oil to be released into the Bv port
through a relief operation.
At the same time, the pressure oil flows through the ori-
fice (6) and enters the piston chamber (B), where it works
in the direction of spring compression to compress the
spring (4). At this time, the spring force increases in pro-
portion to the distance traveled by the piston (5), which
causes the relief pressure to increase.
The spring (4) is compressed the most when the piston
(5) is moved left to the stroke end. At this time, the pres-
sure becomes the set relief pressure.
Parking brake
The friction discs (1) are each connected to the pinion
gear (2) via the spline, and the center discs (3) are also
each connected to the bearing housing (4) via the spline.
The friction discs (1) and the center discs (3) are each
pressed against the bearing housing (4) by the springs
(5) via the brake piston (6). The friction force between
these discs generates a braking torque that prevents the
pinion gear (3) from rotating.
When the oil is directed from the parking brake release
port to the piston chamber (A), the oil pressure overpow-
ers the spring force and acts to move the brake piston
(6). This creates a clearance between the friction discs
(1) and the center discs (3), which works to release the
parking brake function.
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