Hyundai HL955 Manual page 469

1) WHEN THE RCV LEVER IS IN THE RAISE POSITION
Bucket Boom
Aux
4
5
Control unit
(Electro-Hydraulic & Joysick steering)
EH18 EH17 EH20 EH19 EH22 EH21
6
4 6(4) 3(2)
1 5(3)
To MCV
a3 b3 a1 b1 a2 b2
Steering valve
(EHPS) EF port
Steering valve
(EHPS) LS port
Return line
1
29
PS
Steering system
B1
S1
·
When the RCV lever (4, boom) is pulled back, the boom spool is moved to raise position by pilot oil
pressure from EH control block (6).
·
The oil from main pump (1) flows into main control valve (3) and then goes to the large chamber of
boom cylinder (13) by pushing the load check valve of the boom spool.
·
The oil from the small chamber of boom cylinder (13) returns to hydraulic oil tank (22) through the
boom spool at the same time.
·
When this happens, the boom goes up.
P
3
LS
Joystick
4' Pst
T
T
P
2(1) ( ) : 2 Spool
28 28 11
12
S1
X1 X2
P1 T
X3
X1 X2
B2
L2 L1 S2 L4 L3
14
40
a1
B1
A1
Bucket
b1
A1
Return line
23
25
24
26
22
Fan & brake pump
6-5
13
LH RH
29
29
a2 a3
B3
A2 B2 A3
Boom Aux
b2 b3
757F6WE03