3-M29
L3130 · L3430 · L3830 · L4630 · L5030, WSM
TRANSMISSION
(C) Function of Components
■ Servomechanism
As for the servomechanism, the regulator (2) and servo piston (6) are chiefly composed. The regulator is
connected to the HST pedal through linkages, and controls the flow of oil to the servo piston by the pedal operation.
The servo piston moved by hydraulic force, is connected to the pump cylinder swashplate. Therefore, a tilt angle
of swashplate is varied by servo piston movement.
As for the regulator and the servo piston, it is connected with feedback lever (4), and the movement of the piston
is restricted according to the amount of depressing of the HST pedal.
Refer to Workshop Manual of “TRACTOR MECHANISM” (Code No. 97897-18200) for the operation of the
servomechanism, that is, the operation of regulator and servo piston.
■ Valves
As for the mechanism and function of check and high pressure relief valve, charge relief valve and case relief valve,
refer to Workshop Manual of “TRACTOR MECHANISM” (Code No. 97897-18200).
(1) Control Lever (Connected to
HST Pedal)
(2) Regulator Valve Assembly
(3) Spool
(4) Feedback Lever
(5) Control Arm
(6) Servo Piston
(7) Spring
(8) Piston Adjusting Screw
(9) Orifice
(10) Pin A (Fixed with Control Arm)
(11) Pin B (Fixed with Spool)
A : Slit for Connection of
Swashplate
P : IN Port (From Bypass Pipe)
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