Control Linkage - Kubota B2650HSDC Workshop Manual

B2650HSDC, B3350HSDC, WSM
(Continued)
When the speed control pedal is stepped on and set to "REVERSE", 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 from the pump cylinder block enters to 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 reward 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 C at low pressure and retunes to the
pump port A.

[4] CONTROL LINKAGE

The HST pedal (5) and trunnion shaft (4) of variable
swashplate are linked with the HST plate (7) and the
neutral holder (3). As the front footrest of the pedal is
depressed, the swashplate rotates and forward traveling
speed increases. Depressing the rear footrest increases
reverse traveling speed.
The roller (2) on the neutral holder arm (1) is held
with spring seats and the detent of the neutral holder (3)
so that the neutral holder (3) returns to neutral. When the
pedal is releases, the swashplate is returned to neutral
with the neutral holder (3). The damper (8) connected to
the HST pedal (5) restricts the movement of the linkage
to prevent abrupt operation or reversing.
(1) Neutral Arm
(2) Roller
(3) Neutral Holder
(4) Trunnion Shaft
2-M13
TRANSMISSION
9Y1210822TRM0009US0
(5) HST Pedal
(6) Spring
(7) HST Plate
(8) Damper
9Y1210822TRM0010US0
KiSC issued 05, 2014 A