Kubota B1620 Workshop Manual

HYDRAULIC SYSTEM
B1220, B1620, B1820, WSM
8-M7
(EU)
[3] HYDRAULIC CONTROL VALVE
Neutral
Oil forced into the control valve (1) through P port
and returns to the transmission case through T1 port.
Also, C port is closed by spool (2), oil in the hydraulic
cylinder does not flow to the transmission case.
Thus, the implement remains at its fixed position.
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Lift
When the control lever is set to the "LIFT" position,
The spool (2) is moved to the left.
The oil forced into the control valve (1) through P port
flows to C port.
The oil pushes and flow into the hydraulic cylinder
through the C port to lift the implement.
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Down
When the control lever is moved to "DOWN"
position, the spool (2) is moved to the right.
Oil in the hydraulic cylinder is forced out to the
transmission case through the T3 port by the weight of
the implement, causing the implement to lower.
Oil forced into the control valve (1) through the P port
and returns to the transmission case through the T1 port.
NOTE
• The T0 port is connected to T2 through the relief valve. When the relief valve opens, pressurized oil is
released to the transmission case through T2 ports.
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(1) Control valve
(2) Spool
P : Pump Port
C : Cylinder Port
T0 : Tank Port
(Connected to T2)
T1, T2 : Tank Port
(1) Control valve
(2) Spool
P : Pump Port
C : Cylinder Port
T0 : Tank Port
(Connected to T2)
T1, T2 : Tank Port
(1) Control valve
(2) Spool
P : Pump Port
C : Cylinder Port
T0 : Tank Port
(Connected to T2)
T1, T2, T3 : Tank Port
KiSC issued 07, 2011 A

Kubota B1620 Specifications

General

Engine Type	Diesel
Cylinders	3
Fuel Type	Diesel
Hydraulic System Type	Open center
Drive	4WD
3-Point Hitch Category	Category I