Hydraulic drive and actuation circuit for dumper truck

摘要

The hydraulic drive and activator for a dumper truck comprises a variable flow hydraulic pump (24) with inlet (32) and return (36) orifices. An oil reservoir (28) communicates with the pump through a pipe (34) to pass the oil through the pump inlet orifice. A control gate (26) has inlet (42) and outlet (44) orifices. The inlet orifice communicates through a pipe (38) with the pump return orifice. The control gate has first (46,48) and second (50,52,54) control valve groups. The first group distributes oil through a first circuit to the drive to propel the vehicle. The second distributes oil through a second circuit to enable manoeuvring of the vehicle loader. A return pipe (92) connects the gate outlet orifice through a cooler (94) and filter (96) to the reservoir.