Operation Manual

BX25, RCK54(P)-23BX, RCK60B·23BX, LA240, BT601, WSM
BACKHOE
• Dipperstick (Crowd)
p
T
3TAAAAGNP011 A
(2) (3) (4)
(1) Oipperstick Cylinder
(5) Spool
P: Pump Port
A2: A2 Port
(2) Oipperstick Control Valve
(6) Inlet Section
T: Tank Port
(From Dlpperstick Cylinder)
(3) Bridge Passage
(7) Outlet Section
P.B. :Power Beyond Port
B2: B2 Port
(4) Load Check Valve
(To Dlpperstlck Cylinder)
a: Low Pressure
b: High Pressure
1. When the dipperstick and bucket lever is pulled to the backward to set to the "CROWD" position. the spool (5) of
the dipperstick control valve (2) moves to the left, which forms oil passage between bridge passage (3) and B2
port, and between
A2 port and T port.
2. The pressure-fed oil from the P port opens the load check valve (4) and flows to B2 port to extend the dipperstick
cylinder.
3. Return oil from the dipperstick cylinder returns to the transmission case through the A2 port, low pressure passage
and T port.
9-M6