wsm RTV-X1120D Workshop Manual page 227

RTV-X900, RTV-X1120D, WSM
Control Lever Deactivated
Release the control lever (release the pedal), and the spool comes back to the neutral position. The oil at both
ends of the servo piston (8) flows back to the tank. The oil from the charge pump also flows back to the HST housing.
With such circuit formed, the servo spring (11) pushes the servo piston back to the neutral position.
[C] Charge Relief Valve
The charge pump feeds oil to the HST main circuit
(closed circuit) and the regulator assembly. Oil may leak
out of the HST main circuit (in the HST housing)
depending on the pressure, oil temperature and other
factors. With this in mind, oil must be constantly. Charge
relief valve will open when oil pressure exceeds valve
operating pressure.
[RTV-X900]
Oil temperature
45 to 55 °C
(113 to 131 °F)
[RTV-X1120D]
Oil temperature
45 to 55 °C
(113 to 131 °F)
(1) Valve Poppet
(2) Spring
2-M12
TRANSMISSION
(1) Servo Adjusting Screw
(2) Regulator Valve Assembly
(3) Regulator Spool
(4) Pin B (Fixed with Spool)
(5) Pin A
(Fixed with Regulator Shaft)
(6) Control Lever
(7) Feedback Lever
(8) Servo Piston
(9) Piston Adjusting Screw
(10) HST Housing
(11) Servo Spring
a: Drain to HST Housing
b: From Charge Pump
(Charge Pressure)
9Y1210946TRM0013US0
Valve operating pressure
0.43 to 0.85 MPa
2
4.4 to 8.6 kgf/cm
63 to 120 psi
-1
at 1350 min (rpm)
Valve operating pressure
0.48 to 0.90 MPa
2
4.9 to 9.1 kgf/cm
70 to 130 psi
-1
at 1400 min (rpm)
(a) From Charge Pump
(b) To HST Housing
A: Close
B: Open
9Y1210946TRM0034US0
KiSC issued 01, 2014 A