Kubota RTV 900 Workshop Manual page 13

RTV900, WSM
3. BYPASS VALVE
The purpose of this bypass valve is to release any residual torque within the transmission system by bypass both
high pressure and low pressure sides in HST.
Spool B (2) is interlocked with a foot brake and is subject to frequent use, which may give impact on the oil seal.
Therefore, spool B has been installed on the low pressure side.
Spool A (1) is operated manually (by pulling the VHT pressure release knob).
When the foot brake is applied (or the parking brake activated), the low pressure circuit is directed to the bypass
circuit [C].
Pull the VHT pressure release knob for the bypass valve to operate spool A (1), the circuit on the high pressure
side is also connected to the bypass circuit.
As a result, the pressure on the high pressure side balances that of the low pressure side, this in turn releases any
drive from the transmission.
9-M4
NEW TRANSMISSION
(1) Spool A (Connects with VHT
Pressure Release Knob)
(2) Spool B (Connects with Brake
Cam Lever)
(3) Port Block Cover
[A] At Running
[B] At Dynamic Braking
[C] When Applying the Brake
and Stopping
[D] When Pull the VHT
Pressure Release Knob
After It Stops
W1013315
KiSC issued 04, 2006 A