Kubota BX24 Workshop Manual page 352

BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
 Up
(1) Boom Control Section
(2) Bucket Control Section
(3) Spool
(4) P.B. Passage 1
1. When the hydraulic control lever is set to the "UP" position, the spool (3) of the boom control section (1) moves to
the left, which forms oil passages between passage 1 (7) and B1 port, and between A1 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
B1 port to extend the boom cylinder (8).
3. Return oil from the boom cylinder (8) flows from the A1 port through the passage in the spool (3) and P.B. passage
1 (4) to the bucket control section (3).
(5) Neutral Passage 1
(6) Load Check Valve
(7) Passage 1
(8) Boom Cylinder
P : P Port (From Pump)
T : T Port (To Tank)
A1 : A1 Port
(From Boom Cylinder)
8-M4
FRONT LOADER
B1 : B1 Port (To Boom Cylinder)
P.B. :P.B. Port (To 3 Hitch)
a : Low Pressure
b : High Pressure
KiSC issued 08, 2019 A