Kubota RTV 900 Workshop Manual page 16

RTV900, WSM
Pedal pressed fully and under light load
Let's suppose that the pedal is fully pressed. 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 to maximum.
The pump cylinder block (5) is driven by the input shaft (19) to put the oil under high pressure and to feed it at the
highest rate out of the pump port A. The pressure-fed oil flows into the motor's port D along the circuit. The pressure
of the oil from the HST pump is not high enough to get the assist motor started. In this way, the output shaft (14)
achieves the maximum rpm with the assist motor off, as shown in the figure above.
Then the motor's oil drops to a low pressure and returns through the motor port C to the pump port A.
9-M7
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
W1014064
KiSC issued 04, 2006 A