TIC Key to diagram:
LEXION 510-600
Basic Machine Hydraulic System
226 305 306 353 502 602 603 706-3* 706-4* 732 734 740 776
Front attachment reverser drive motor ....................OMP 200 AUTOCONTOUR cross levelling right hydraulic cylinder AUTOCONTOUR cross levelling left hydraulic cylinder Reverse front attachment hydraulic cylinder Cross levelling accumulator .....................................0.7 l / 80 bar AUTOCONTOUR / Cross levelling shut-off valve Pressure relief bolt Cross levelling pressure relief valve (Montana) .......200 bar Cross levelling pressure relief valve (Montana) .......200 bar Non-return valve Non-return valve (Lock-up valve unit) Flow control valve Reversing connecting valve (with restrictor)
Y67
Front attachment cross levelling left solenoid valve Front attachment cross levelling right solenoid valve Reverse front attachment solenoid valve
Y68 Y86 a
Option
D T P1 M R
Restrictor bore Tank port Pump via master valve port Front attachment reverse hydraulic cylinder port Motor return line port
III
AUTOCONTOUR / Reverse valve block Note:
Prior to dismounting items 732, 502, 740, Y67 or Y68, the accumulator must be relieved at the pressure relief bolt (603).
Description of function: Neutral function
The spring force displaces the oil from the reverser cylinder (353) via the connection from M to T inside the solenoid valve (Y86) to the tank. During this process, port (P1) is closed.
Reversing function
The solenoid valve (Y86) and the master valve (Y77) are actuated at the same time. During this, the return line to the tank is closed by solenoid valve (Y86) and the restrictor bore (D) provides the connection from (P) to the consumer port (M). When actuating the front attachment reverse solenoid valve (Y86), the restrictor bore (D) creates a differential pressure at the reversing connecting valve (776) which in turn opens valve (776). A notch in the main ram of reversing connecting valve (776) ensures a smooth start of the reversing process. The reversing cylinder (353) extends and swings the hydraulic motor (226) to the drive gearwheel. Just before reaching the end position, the volume flow to the hydraulic motor (226) is released, ensuring reliable gearwheel engaging. The non-return valve (732) keeps the hydraulic motor (226) from starting due to pressure peaks occurring in the return line.
11/05
Lex-h-Kap3
3-135
