Hyundai HX140L, Manual

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2-54
BRAKE SYSTEM
Control valve swing brake system
This is the brake system to stop the swing motion of the excavator during operation.
In this system, the hydraulic circuit is throttled by the swing control valve, and the resistance
created by this throttling works as a brake force to slow down the swing motion.
Mechanical swing parking brake system
This is function as a parking brake only when the swing control lever and arm in control lever are
not operated.
Brake assembly
Circumferential rotation of separate plate
(14) is constrained by the groove located
at casing (1). When housing is pressed
down by brake spring (16) through
friction plate (13), separate plate (14)
and parking piston (15), friction force
occurs between friction plate and
separate plate.
Friction force constrains motion of
cylinder block (8). When hydraulic force
exceeds spring force, brake is released.
Work
Deceleration Stop
MCV A, B opened MCV A, B throttled MCV A, B closed
MCV MCV MCV
A B
A B
A B
Groove
8
13
1
14
15
16
1 Casing
8 Cylinder block
13 Friction plate
14 Separate plate
15 Parking piston
16 Brake spring
4)
(1)
(2)
刮
2-48(1)
140WF2SM35