Bi-Speed Restraint Check (Bi-Speed Turn System) - Kubota WSM STV32 Workshop Manual

STV32 · STV36 · STV40, WSM

(6) Bi-speed Restraint Check (Bi-speed Turn System)

The bi-speed restraint function is designed to deactivate the bi-speed control when the machine is at a halt or
running at low speed (below 0.2 km/h) or high speed (above 9.0 km/h).
The following procedures are to check the travelling speed sensor output and the controller's bi-speed restraint
function.
Procedure 1: Changing to the bi-speed restraint check mode
1. Hold down the bi-speed switch and turn on the main switch (The engine does not start). Now make sure the bi-
speed indicator lamp lights up and goes out 0.75 second later.
2. Release the bi-speed switch. This calls for the "Fine adjustment and self-diagnosis mode".
3. With the machine in the above mode, start the engine. The controller monitors the potential at the alternator
terminal L and calls for the "bi-speed restraint check mode" when the engine is detected to get started. (In this
mode, the bi-speed control does not work. The bi-speed restraint, depending on the input from the travelling
speed sensor but regardless of the front wheel turning angle sensor output, is shown with the bi-speed lamp.)
Procedure 2: Checking the travelling speed sensor input
1. Drive the tractor straight in each of the following 3 conditions and look at the bi-speed indicating lamp to see if
the bi-speed restraint works accordingly. The travelling speed sensor is mounted on the 22T gear of differential
gear case.
(Reference)
Approximate travelling speed with
A 0 to 0.2 km/h (0 to 0.13 mph)
B 0.2 to 9.0 km/h (0.13 to 5.62 mph)
C over 9.0 km/h (over 5.62 mph)
A Checking condition A: Tractor at stop
A Checking condition B: Drive the tractor with range gear shift 1, cruise control lever at 2 notches at engine speed
around 1000 rpm
A Checking condition C: Drive the tractor with range gear shift 2, depress the HST foot pedal fully for forward at
engine speed around 2000 rpm
Procedure 3: Checking the bi-speed control output
1. Switch off the main switch
2. Switch on the main switch again to start the engine. Enter the ordinary control mode.
3. Turn on the bi-speed mode and turn the tractor right and left to make sure the bi-speed control functions.
4. Turn off the bi-speed mode and turn the tractor right and left to make sure the bi-speed control does not function.
Procedure 4: Exiting from the bi-speed restraint check mode
1. Turn off the main switch.
2. The bi-speed restraint mode can be accepted through the above two procedures "Checking the travelling speed
sensor input" and "Checking the bi-speed control output".
standard tire
Bi-speed indicator lamp
Turned off
Lights up
Turned off
9-S12
ELECTRICAL SYSTEM
0000007913E
KiSC issued 04, 2006 A