Hyundai HX145LCR Manual page 115

(2) (2)
Brake valve Brake valve
①
Brake released Brake released
When the pressurized oil supplied from
port (A), the oil opens valve (27) and fl ows
into port (C) at the suction side of hydrau-
lic motor to rotate motor.
At the same time, the pressurized oil
passes through pipe line (a) from a small
hole in spool (23) and flow into chamber
(b). The oil acts on the end face of spool
(23) which is put in neutral position by the
force of spring (28), thus causing spool (23)
to slide to the left. When spool (23) slides,
port (D) on the passage return side of hy-
draulic motor, which is closed by the spool
groove during stoppage, communicates
with port (B) at the tank side and the return
oil from the hydraulic motor runs into the
tank. In consequence, the hydraulic motor
rotates.
Moreover, sliding of spool (23) causes the
pressurized oil to fl ow into ports (P) and (S).
The pressurized oil admitted into port (P)
activates piston (12) of the parking brake
to release the parking brake force. (For
details, refer to description of the parking
brake.) When the pressurized oil is sup-
plied from port (B), spool (23) and valve
(27) move reversely and the hydraulic mo-
tor also rotates reversely.
D
23
28
25
2-63
12
C
Ps
B A
14092TM06
b
a
27