Operation Manual
BX25,
RCK54(P)-23BX,
RCK60B-23BX,
LA240,
BT601,
WSM
BACKHOE
•
Dipperstick
(Extend)
P T
(5) Spool
P:
Pump Port
A2:
A2
Port
(6) Inlet Section
T:
Tank Port
(To
Dipperstlck Cylinder)
(7) Outlet Section
P.B.
:Power Beyond Port
B2:
B2 Port
(From Dipperstick Cylinder)
a:
Low
Pressure
b:
High Pressure
1.
When the dipperstick and bucket lever is pushed
to
the forward to set to the
"EXTEND"
position, the spool (5) of
the dipperstick control valve (2) moves to the right, which forms oil passage between bridge passage (3) and
A2
port, and between
82
port and T port.
2.
The pressure-fed oil from the P port opens the load check valve (4) and flows to
A2
port to retract the dipperstick
cylinder.
3.
Return oil from the dipperstick cylinder returns to the transmission case through the
82
port, low pressure passage
and T port.
(1
)
P.B.
(6)
(2) (3) (4)
3TAAAAGNP012A
(1) Dipperstick Cylinder
(2) Dipperstick Control
Valve
(3) Bridge Passage
(4) Load Check Valve
9-M7