Kubota RTV 900 Workshop Manual page 15

RTV900, WSM
Pedal pressed halfway and under light load
Let's suppose that the pedal is pressed halfway. The control lever is activated by the pedal to switch the regulator
valve's hydraulic circuit. The servo piston (4) is then actuated to tilt the pump's variable swashplate (17) (see the
above illustration).
The pump cylinder block (5) is driven by the input shaft (19) to put the oil under high pressure and to feed it out of
the pump port A. The pressure-fed oil flows into the motor's port D along the circuit. The motor's piston is actuated
by this pressurized oil to push down the stationary swashplate. Then together with the motor's cylinder block (10), the
output shaft (14) starts turning.
The output shaft rpm is determined by the delivery rate of the HST pump, varying the rpm.
Then the motor's oil drops to a low pressure and returns through the motor port C to the pump port B.
9-M6
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
W1013792
KiSC issued 04, 2006 A