User Manual

Table Of Contents
Electric System LEXION Montana 570-520 TIC
42s-4 Lex-e-42s 03/05
Description of function:
2/2
Service brake When activating the left (Z84) and the right (Z85) service brake, the
control oil pressure in the ground drive will also collapse at the
solenoid coil (Y125) and the variable-displacement pump will swing
back to zero delivery, independent of the ground drive control lever
position.
Hydrostatic brake valve system When the diesel engine speed exceeds the allowed maximum of
2230 rpm (e.g. downhill travel), the ground drive hydraulic motor
(HBM) brake restrictor module A45 also receives this information from
the fieldwork computer module via the CAN bus. Now the ground drive
hydraulic motor (HBM) brake restrictor module A45 actuates the
working hydraulics master valve (Y77) in order to put a greater load on
the drive – Circuit diagram 4s.
When the diesel engine speed exceeds 2300 rpm, the brake restrictor
(Y124) is additionally actuated in order to restrict the high-pressure
circuit in the ground drive. When the speed now drops below
2210 rpm, the brake restrictor (Y124) is deactivated.
Swing angle of hydraulic motor
and differential lock.
The hydraulic drive ranges resulting from the changed swivel angle in
the hydraulic motor (S92, Y144) and the differential lock inside the axle
(S94, Y105) are set manually without any influence from the gearshift
control menu (A36).
Montana brake pressure
accumulator
The sensor/switch (B90) controls the brake system accumulator
pressure and, if necessary, actuates the working hydraulics master
valve (Y77) via the gearshift control module (A36/pin16), the diode
PCB D0 and the Ground drive hydraulic motor brake restrictor module
(A45/pin5#pin2) in order to recharge the brake circuit accumulator –
circuit diagram 04s.