Hyundai HX145LCR Manual page 131

②
When motor stop When motor stop
When operator moves a travel control lever to neutral position, pump oil flow is blocked. It reduce
oil pressure of supply line down to zero, and oil in the spool chamber moves back to oil tank
through counter orifice by the return force of spring in opposite side, and then counter balance
spool returns to neutral position.
As the counter balance spool moves to left, line ⓐ is blocked, parking brake line is connected to
drain passage designed in the center of counter balance spool, and oil in the parking brake
chamber return to tank, finally brake piston return to parking ON position.
Counter
orifice
Counter
balance
spool
Spool
Check valve
chamber
A Port
(IN Port)
a
2-79
Brake fluid pressure way
B Port
(OUT Port)
b
A fuel inlet of
cylinder block
(Hatching part)
Spring
145Z9A2TM12