Technical data

52
Additional shift stage
Shifting procedure
Triggered by the button on the gear shift knob
E287 in conjunction with the signal from the
clutch pedal switch F195, the additional shift
stage control unit J554 checks the switch
request for plausibility and activates the relay
J555 for the hydraulic pump.
The hydraulic pump V190 then increases the
oil pressure which is fed to the hydraulic
regulator.
Shifting to low range
At the same time as the hydraulic pump is
activated, solenoid valve N331 moves to
position 2.
The system pressure acts essentially on the
piston rod side of the working cylinder. The
piston side is now vented to the return line
via N331. The selector rod retracts and low
range is activated (see also power flow).
“LOW RANGE” appears in the FIS display.
When the selector sleeve reaches the end
position (switch time approx. 0.5 seconds)
this is recognised by the control unit with the
aid of the travel sensor G302. The hydraulic
pump is switched off and the solenoid valve
N331 moves to position 1.
241_109
Shift position 1
Shift position 2
Shift position 1
Hydraulic pump V190
Control unit J554
Relay J555
Clutch pedal switch F194
Button E287
Shift positions