wsm L3301 Workshop Manual page 296

L3301, L3901, L4701, WSM
When the HST pedal is pressed toward the forward side
(1) Oil Cooler
(2) Oil Filter (HST)
(3) Swash plate
(4) Cylinder Block (Motor)
(5) Piston
(6) Cylinder Block (Pump)
(7) Charge Relief Valve
When the speed control pedal is stepped on and in forward, the variable swash-plate 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 enters motor port C, the pistons, which align with port C, are pushed against the swash-plate 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
swash-plate determines the output shaft speed.
As the motor cylinder block continues to rotate, oil is forced out of motor port D at low pressure and returns to the
pump port B.
(8) Check and High Pressure
Relief Valve (Forward)
(9) Check and High Pressure
Relief Valve (Reverse)
(10) Case Relief Valve
(11) Transmission Case
(12) Oil Filter
3-M22
(13) Hydraulic Control Valve
(14) Hydraulic Pump
(Main Circuit)
(15) Hydraulic Pump
(Power Steering)
(16) Power Steering Controller
TRANSMISSION
A: Pump Port A
B: Pump Port B
C: Motor Port C
D: Motor Port D
9Y1211012TRM0023US0
KiSC issued 09, 2016 A