Rotary chaff screen pump

Key to diagram:

226 Front attachment reverser drive motor ....................OMP 200 305 AUTOCONTOUR cross levelling right hydraulic cylinder 306 AUTOCONTOUR cross levelling left hydraulic cylinder 353 Reverse front attachment hydraulic cylinder 502 Cross levelling accumulator.....................................0.7 l / 80 bar 602 AUTOCONTOUR / Cross levelling shut-off valve 603 Pressure relief bolt 706-3* Cross levelling pressure relief valve (Montana).......200 bar 706-4* Cross levelling pressure relief valve (Montana).......200 bar 732 Non-return valve 734 Non-return valve (Lock-up valve unit) 740 Flow control valve 776 Reversing connecting valve (with restrictor)

Y67 Front attachment cross levelling left solenoid valve Y68 Front attachment cross levelling right solenoid valve Y86 Reverse front attachment solenoid valve

a Option

D Restrictor bore T Tank port P1 Pump via master valve port M Front attachment reverse hydraulic cylinder port R 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.