Kubota WSM B2050 Workshop Manual page 361

B2050, B2350, B2650, B3150, WSM
Dump 1
(1) Boom Control Section
(2) Bucket Control Section
(3) PB Passage 1
(4) Spool
(5) Neutral Passage 2
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 extend by the difference of received
pressure area (cylinder rod part).
(6) PB Passage 2
(7) Load Check Valve
(8) Passage 2
(9) Bucket Cylinder
P: P Port
T: T Port
PB: PB Port
8-M18
HYDRAULIC SYSTEM
A2: A2 Port
(To Bucket Cylinder)
B2: B2 Port
(From Bucket Cylinder)
b: High Pressure
9Y1210982HYM0021US0
KiSC issued 03, 2014 A