Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
FRONT LOADER
• Roll-back
P.t:S.;--------, r;::========-,
(4)
3TAAAAGLP021A
(5)
:a
_:b
(1) Boom Control Section (6) P.B. Passage 2
P : P Port (From Pump)
B2: B2 Port
(2) Bucket Control Section (7) Load Check Valve
T : T Port (To Tank)
(To Bucket Cylinder)
(3)
P.B. Passage 1 (8) Passage 2
P.B. :P.B. Port (To 3 Hitch)
a :
Low Pressure
(4) Spool (9) Bucket Cylinder
A2: A2 Port
b : High Pressure
(5) Neutral Passage 2 (From Bucket Cylinder)
1. When the hydraulic control lever is set to the "ROLL-BACK" position, the spool (4) of the bucket control section
(2) moves to the left, which forms oil passages between passage 2 (8) and B2 port, and between A2 port and T
port.
2. The pressure-fed oil from the P port flows to the neutral passage 2 (5) through the boom control section (1) and
P.B. passage 1 (3). As the oil passage from the neutral passage 2 (5) to the P.B. passage 2 (6) is closed by the
spool (4), this oil opens the load check valve (7), and flows through the notched section of the spool (4) and B2
port to retract the bucket cylinder (9).
3. Return oil from the bucket cylinder (9) flows to the transmission case through the A2 port and T port.
8-M7