6-22
a2
a1
a3
b3
b2
b1
T
LS
B
VIEW B
P
VIEW A
A
B1
A1
B2
A2
LS
a2
b2
b1
a1
Pst
B3
A3
b3
a3
T
Dump
Roll back
Up
Down
Floating
P
Bucket
Boom
Aux
Pst
Hydraulic circuit
A3
B3
A2
B2
A1
B1
6. MAIN CONTROL VALVE
STRUCTURE (1/3)
·
Type : Closed center, Load pressure - Independent - Flow - Distribution
1)
75796WE10
Port
Port name
Port size
P
From main pump
1 5/16-12UN
T
To hydraulic tank
1 5/16-12UN
A1, B1
To bucket cylinder port
1 5/16-12UN
A2, B2
To boom cylinder port
1 5/16-12UN
a1, b1
Bucket pilot port
11/16-16UN
a2, b2
Boom pilot port
11/16-16UN
a3, b3
Auxiliary pilot port
11/16-16UN
LS
Load sensing port
9/16-18UNF
Pst
To RCV P port
9/16-18UNF
Summary of Contents for HL955
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