Operation Manual

B><25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
FRONT LOADER
• Dump 1
(4)
3TAAAAGLP022A
( 1
P T
T
_:b
(1) Boom Control Section (6) P.B. Passage 2
P : P
Port (From Pump) A2 :A2 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) B2: B2 Port
(4) Spool (9) Bucket Cylinder
(From
Bucket Cylinder)
(5) Neutral Passage 2
b :
High Pressure
1. When the hydraulic control lever is set to the "DUMP 1" position, the spool (4), which forms oil passages among
passage 2 (8),
A2 port and B2 port.
2. The pressure-fed oil from the P port flows through the boom control valve, opens the load check valve, and flows
to the bucket cylinder to extend the cylinder through the notched section
of the spool and A2 port.
3. Return oil from the bucket cylinder (9) flows from the B2 port to the passage 2 (8), and flows to the A2 port together
with the pressure-fed oil from the P port.
As a result, the dump speed is increased.
(Reference)
• The
oil pressure
of the A2 port and B2 port is identical, but the bucket cylinder extends by the difference of received
pressure area (cylinder rod part).
8-M8