Kubota RTV 900 Workshop Manual page 19

RTV900, WSM
Dynamic Brake
Release the pedal, and the regulator valve forces the servo piston (4) to the neutral position. The pump's variable
swashplate (17) also goes back to the neutral position.
Still the machine tends to keep running by inertia force, but no oil is pressure-fed because the pump's variable
swashplate is in the neutral position. (There is no oil flow from the HST pump (5).)
The output shaft (14), however, is rotated in the same direction as before releasing the pedal.
Now the stationary motor (10) works like a pump to suck the oil from port D and pressure-feed it from port C.
The oil coming from port C pushing open the high pressure relief valve and flows through the check valve back to
port D.
The dynamic brake force is determined by the force that is exerted to push open the backward travel high-pressure
relief valve.
When the dynamic brake is applied, the pressure at port D drops below the charge pressure level. If the oil from
port C is not enough to make up for the shortage, the charge oil too is supplied together.
9-M10
NEW TRANSMISSION
(1) Pedal
(2) Regulator Valve Assembly
(3) Regulator Spool
(4) Servo Piston
(5) Cylinder Block
(6) HST Housing
(7) Control Piston
(8) Variable Swashplate
(Assist Motor)
(9) Cylinder Block (Assist Motor)
(10) Cylinder Block
(Stationary Motor)
(11) Check and High Pressure
Relief Valve
(12) Bypass Valve
(13) Transmission Case
(14) Output Shaft
(15) Charge Relief Valve
(16) Oil Filter Cartridge (Suction)
(17) Variable Swashplate
(HST Pump)
(18) Charge Pump
(19) Input Shaft
(20) Oil Cooler
(21) Oil Filter Cartridge
a : To HST Housing
b : Connects with Cable for
VHT Pressure Release
Knob
c : Connects with Brake Cam
Lever
W1014882
KiSC issued 04, 2006 A