A pump system has a base unit and a pump unit. The base unit includes an
input part operatively connected to a driving source and a plurality of
output parts to which power is transmitted from the input part. The base
unit is capable of being mounted to a support member. The pump unit
includes a plurality of pump shafts respectively driven by the plurality
of output parts, a plurality of hydraulic pump bodies respectively driven
by the plurality of pump shafts, and a plurality of pump cases for
respectively surrounding the plurality of hydraulic pump bodies, the pump
unit detachably connected to the base unit. The pump shafts are connected
to the corresponding output parts by connecting the pump cases to the
base unit.