Hyundai HL955 Manual page 347

1) 1) SERVICE BRAKE RELEASED SERVICE BRAKE RELEASED
Return line
22
Return line
21
Main pump
When the pedal of brake valve (19) is released, the operating force is eliminated by the force of the
spring, and the spool is returned.
When the spool removes up, the drain port is opened and the hydraulic oil in the piston of axles
return to the tank (21).
Therefore, the service brake is kept released.
16
S1 B1
15
P
PS
18
PP
23
24
25
P1
T1
P2
T2
16
17
B2
S2 S3
18
G1
Parking
B3
18
G2
T1 T2
26
2
B
S L
4-4
19
Front
A1
20
40
A2
Rear
T/M
41
30
D
A
P A
T B
B
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