Hyundai HL955 Manual page 471

3) WHEN THE RCV LEVER IS IN THE FLOAT POSITION
Bucket Boom
Aux
4
5
Control unit
EHCU
(Electro-Hydraulic & Joysick steering)
EH20 EH19 EH22
EH18 EH17 EH21
6
4
1 6(4) 3(2) 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 pushed further forward from the lower position, the pilot pressure
reaches to 13~15bar, then the boom spool is moved to floating position.
·
The work ports (A2), (B2) and the small chamber and the large chamber are connected to the
return passage, so the boom will be lowered due to it's own weight.
·
In this condition, when the bucket is in contact with the ground, it can be move up and down in
accordance with the shape of the ground.
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 S2 L4 L3
L1
14
40
a1
B1
A1
Bucket
b1
A1
Return line
23
25
24
26
22
Fan & brake pump
6-7
13
LH RH
29
29
a2 a3
B3
A2 B2 A3
Boom Aux
b2 b3
757F6WE05