Hyundai HX145LCR Manual page 116

②
Stopping and stalling (brake applied) Stopping and stalling
When the pressurized oil supplied from
port (A) is stopped during traveling, no
hydraulic pressure is applied and spool
(23) which has slid to the left will return on
the right (neutral) via stopper (25, 26) by
the force of spring (31). At the same time,
the hydraulic motor will rotate by the iner-
tia even if the pressurized oil stopped, so
the port (D) of the motor will become high
pressure. This pressurized oil goes from
chamber (f) to chamber (g) through the
left-hand valve (401). When the oil enters
chamber (g), the piston (409) slides to
the right so as not to rise the pressure, as
shown in the figure. Meanwhile, the left-
hand valve (401) is pushed open by the
pressurized oil in port (D). Therefore, the
pressurized oil in port (D) fl ows to port (C)
at a relatively low pressure, controlling the
pressure in port (D) and preventing cavi-
tation in port (C). When the piston (409)
reaches the stroke end, the pressure in
chamber (g) and (f) increase and the left-
hand valve (401) closes again, allowing the
oil pressure in port (D) to increase further.
Then, the right-hand valve opens port (C)
with pressure higher than that machine re-
lief set pressure. In this way, by controlling
the pressure in port (D) in two steps, the
hydraulic motor is smoothly braked and to
a stop.
D
g
f
409
401
2-64
C
23
25,26
31
30
32
A
B
25092TM07