Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
BACKHOE
• Bucket (Dump)
3TAAAAGNP010A
(1) Bucket Cylinder
(5) Spool
A1 : A1 Port
P: Pump Port
(2) Bucket Control Valve
(6) Inlet Section
(To Bucket Cylinder)
T: Tank Port
(3) Bridge Passage
(7) Outlet Section
B1 : B1 Port
P.B. :Power Beyond Port
(4) Load Check Valve
(From Bucket Cylinder)
a: Low Pressure
b: High Pressure
1. When the dipperstick and bucket lever is moved to the right to set to the "DUMP" position, the spool (S) of the
bucket control valve (2) moves to the left, which forms oil passage between bridge passage (3) and
Ai port, and
between
B1 port and T port.
2. The pressure-fed oil from the P port opens the load check valve (4) and flows to Ai port to retract the bucket
cylinder.
3. Return oil from the bucket cylinder returns to the transmission case through the B1 port, low pressure passage and
T port.
9-MS