Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
FRONT LOADER
• Down
P.B ....... ---- ...... .., r--------~~-__,
3TAAAAGLP019A
P T
B1
:a
_:b
(1) Boom Control Section
(5) Neutral Passage 1 P : P Port (From Pump)
B1 : B1 Port
(2) Bucket Control Section
(6) Load Check Valve T : T Port
(To Tank) (From Boom Cylinder)
(3) Spool (7) Passage 1
A1 : A1 Port (To Boom Cylinder) P.B. :P.B. Port (To 3 Hitch)
(4) P.B. Passage 1
(8)
Boom Cylinder a : Low Pressure
b : High Pressure
1. When the hydraulic control lever is set to the "DOWN" position, the spool (3) moves to the right, which forms oil
passages between passage 1 (7) and
A1 port, and between B1 port and P.B. passage 1 (4).
2. As the oil passage from the neutral passage 1 (5) to the P.B. passage 1 (4) is closed by the spool (3), the pressure-
fed oil from the P port opens the load check valve (6) and flows through the notched section
of the spool (3) and
A1 port to retract the boom cylinder (8).
3. Return oil from the boom cylinder (8) flows from the B1 port through the passage in the spool (3) and P.B. passage
1 (4) to the bucket control section (2).
8-M5