Hyundai HL955 Manual page 494

(4) Boom float position
A2 B2
T
P
a2
b2
a2
a1
B2
P A1 A2
B1
LS
Boom
Bucket
Pst
T
b1 b2
Hydraulic circuit
75796WE54
When the boom spool is located in float position, the oil from the pump will be blocked.
The cylinder ports (A2, B2) are connected to the tank passage, so the boom will be lowered due
to it's own weight.
6-30