Kubota BX1860 Workshop Manual page 139

BX1860, BX2360, BX2660, RCK48(P)-18BX, RCK54(P)-23BX, RCK60B-23BX, LA203, LA243, WSM
Forward
(1) Cylinder Block (Pump)
(2) Swashplate
(3) Piston
(4) Cylinder Block (Motor)
(5) Check and High Pressure
Relief Valve (Forward)
(6) Check and High Pressure
Relief Valve (Reverse)
When the speed control pedal is stepped on and in forward, the variable swashplate is tilted as shown in figure
above.
As the pump cylinder block rotates with the input shaft, oil is forced out of pump port B at high pressure. As
pressure oil enters motor port D, the pistons, which align with port D, are pushed against the swashplate and slide
down the inclined surface.
Then the output shaft rotates with the motor cylinder block. This drives the machine forward and the angle of pump
swashplate determines the output shaft speed.
As the motor cylinder block continues to rotate, oil is forced out of motor port C at low pressure and returns to the
pump.
(7) High Pressure Relief Port
Plug (Forward)
(8) Charge Relief Valve
(9) High Pressure Relief Port
Plug (Reverse)
(10) PTO Clutch Valve
(11) PTO Relief Valve
(12) Oil Filter Cartridge
(13) Power Steering Controller
(14) Hydraulic Pump
(15) Flow Priority Valve (Hydraulic
Control Valve)
(16) Position Control Valve
(17) Oil Strainer
(18) Transmission Case
2-M5
TRANSAXLE
A : A Port
B : B Port
C : C Port
D : D Port
X : High Pressure
Y : Low Pressure
Z : Free Oil
KiSC issued 06, 2009 A