wsm L3301 Workshop Manual page 301

L3301, L3901, L4701, WSM
Reverse
(1) Transmission Case
(2) Filter
(3) Input Shaft
(4) Hydraulic Pump
(5) Power Steering Circuit
(6) Variable Swashplate
(7) Servo Piston
(8) Feedback Lever
(9) Regulator Valve Assembly
When the HST pedal (10) is stepped on and in reverse, the variable swashplate (6) is tilted by the servo piston
(7) and the regulator valve (9) as shown in figure above.
As the pump cylinder block (14) rotates with the input shaft (3), the oil is forced out of pump port B at high
pressure. As the pressured oil enters motor port C, the pistons, which align with port C, are pushed against the thrust
plate and slide down inclined surface.
Then the output shaft (22) rotates with the motor cylinder block (21). This drives the machine rearward and the
angle of pump swashplate determines the output shaft speed.
As the motor cylinder block (21) continues to rotate, oil is forced out of motor port D at low pressure and returns
to the pump port A.
(10) HST Pedal
(11) Spool
(12) Bypass Pipe
(13) HST Assembly
(14) Pump Cylinder Block
(15) Oil Cooler
(16) Case Relief Valve
(17) Charge Pump
(18) Charge Relief Valve
3-M27
(19) Oil Filter
(20) PTO Clutch Valve Circuit
(21) Motor Cylinder Block
(22) Output Shaft
(23) Check and High Pressure
Relief Valve
(24) PTO Clutch Pressure Priority
Valve
TRANSMISSION
A: Pump Port
AB: Pump Port
BC: Motor Port
CD: Motor Port
DW: High Pressure Oil
X: Low Pressure Oil
Y: Free Oil
Z: Suction Oil
9Y1211012TRM0028US0
KiSC issued 09, 2016 A