User Manual

Table Of Contents
Electric System LEXION Montana 570-520 TIC
42t-4 Lex-e-42t 03/05
Description of function:
2/2
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 4t.
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.
Service brake Pressing both brake pedals (Z84/Z85) is a pre-condition for shifting the
gears in the manual gearbox.
To guarantee that the machine is standing still, a brake pressure of
25 bar min. must be built up by the force acting on the pedal.
At the same time, the control oil pressure necessary for the ground
drive is relieved – see circuit diagram 41t.
Montana brake oil pressure /
brake pressure accumulator
warning
At a pressure below 115 bar, the voltage signal from the left / right
brake circuit pressure switches (Z79/Z80) is connected to the terminal
(A30) and displayed as an alarm message.
Reloading the brake circuit is controlled via the brake circuit charge
pressure sensor (B90) – see circuit diagram 4t.
Parking brake The parking brake (S93) is being actuated when solenoid coil (Y106) is
not actuated.
Besides the warning signals for insufficient brake oil pressure, the
applied parking brake (S93/Z12) is also displayed in the terminal.
If the parking brake (S93/Z12) is applied, no control oil pressure for the
ground drive is built up since the MONTANA GEN II module (A42)
does not actuate the solenoid coil (Y125).