TRANSMISSION
L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
3-M26
(4) Operation
[A] Stage 1
When the HST pedal is in the neutral position
[Tractor Condition]
HST pedal: Neutral Position
Hi-Lo select lever: Lo
When the HST pedal is in the neutral position, the HST pedal sensor continues to send signals to the ECU that
the HST pedal is in the neutral position. The ECU does not send a signal to the proportional control valve when it
receives a signal from the HST pedal sensor. As a result, the servo piston is kept in the neutral position.
In this state, oil from the charge pump fills the HST housing and then is drained to the transmission case via the
case relief valve.
Oil from the hydraulic pump is depressurized by the regulator valve and sent to the PTO valve, power-steering
controller, and proportional control valve, respectively.
9Y1211167TRM0038US0
(1) Pump Swashplate
(2) Pump Piston
(3) Pump Cylinder Block
(4) HST Filter
(5) Charge Pump
(6) Check and High Pressure
Relief Valve
(7) Charge Relief Valve
(8) Motor Cylinder Block
(9) Motor Piston
(10) Motor Swashplate
(11) Out Put Shaft (Motor Shaft)
(12) Piston H
(13) Piston L
(14) Hi-Lo Spool
(15) Spool (Pressure Selector)
(16) Hi-Lo Solenoid Valve
(17) Oil Cooler
(18) Power Steering Controller
(19) Proportional Valve (Reverse)
(20) Proportional Valve (Forward)
(21) Regulator Valve
(22) Hydraulic Pump
(23) Engine
(24) PTO Valve
(25) Filter
(26) Transmission Case
(27) Servo Piston
(28) Servo Position
(29) ECU
(30) Hi-Lo Selector Lever
(31) HST Pedal Sensor
(32) HST Pedal
(33) Input Shaft (Pump Shaft)
(34) Case Relief Valve
A: A Port
B: B Port
C: C Port
D: D Port
a: Charge Pressure
c: Return Oil
e: Signal
f: Oil Flow
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