Kubota B1830 Workshop Manual page 206

B1830,B2230,B2530,B3030, WSM
(Continued)
When the speed control pedal (HST pedal) is stepped on and set to "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 A at high pressure. As
pressure oil from the pump cylinder block enters to motor port C, the pistons, which align with port C, 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 speed.
As the motor cylinder block continues to rotate, oil is forced out of motor port D at low pressure and retunes to the
pump port B.
3-M20
TRANSMISSION
9Y1210003TRM0020US0
KiSC issued 05, 2012 A