3-M26
L3130 · L3430 · L3830 · L4630 · L5030, WSM
TRANSMISSION
[2] POWER TRAIN
The transmission of this model consists of a series of gears and shafts as shown in previous page. The traveling
system is chiefly composed of hydrostatic transmission section, range gear shift section and front wheel drive section.
(1) Hydrostatic Transmission (HST)
(A) Structure
W1022595
The HST of L30 series tractor is a built-in type to the clutch housing, and HST with the servomechanism is adapted.
The servomechanism controls the pedal operation of HST hydraulically. As a result, the HST pedal feels extremely
light and smoother pedal operation can be done.
HST assembly is chiefly composed of HST case (clutch housing), variable displacement piston pump, fixed
displacement piston motor, charge pump, servo-regulator and various valves. Refer to the next page for detailed parts
in the HST.
(1) Output Shaft (Motor Shaft)
(2) Case Relief Valve
(3) Bypass Pipe (Servo Pipe)
(4) HST Case (Clutch Housing)
(5) Port Block Cover
(6) Servo Piston
(7) Servo Regulator
(8) Control Lever (Connect to
HST Pedal)
(9) Input Shaft (Pump Shaft)
(10) Charge Pump
(11) Outlet Port (To Oil Cooler)
(12) Check and High Pressure
Relief Valve (Reverse)
(13) Check and High Pressure
Relief Valve (Forward)
(14) Charge Relief Valve
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