Technical data

53
Shifting to “low range OFF”
At the same time as the hydraulic pump is
actuated, solenoid valve N331 moves to
position 4.
The system pressure acts essentially on the
piston rod side of the working cylinder. The
piston side is now also subjected to system
pressure via N331. Due to the greater piston
surface area on the piston side (greater force)
the piston rod travels outwards and low range
is deactivated (see also power flow).
“LOW RANGE” is extinguished 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 3 for approx.
30 seconds.
This rapidly depressurises the system and
ensures that the selector rod stays in its
current position.
After approx. 30 sec., the solenoid valve N331
returns to position 1.
After a shift operation has been completed,
the system is at atmospheric pressure.
The low range and low range OFF settings are
retained by means of the detents on the
selector sleeve.
During shifting, noise from the
hydraulic pump is audible.
Shift position 1
Shift position 4
Shift position 3
(approx. 30 seconds)
Shift position 1
Shift positions