131 in a configuration similar to the plumbing diagram in fig4 each representative line is shown connected to the simplified representations of the appropriate ports the lines representing the hydraulic motor return hose 131 and the hydraulic pressure accumulator supply hose 129 are shown emphasized with double arrows representing high pressure flow and the direction thereof the lines representing the hydraulic motor supply hose 130 and the portion of the hydraulic pump and reservoir supply hose assembly 127 leading from the hydraulic reservoir port 121 to the hydraulic pump and reservoir supply port 122 are shown emphasized with single arrows representing low pressure flow and the direction thereof in this manner the functioning of control valve 115 during the operating condition referred to previously as u201c braking u201d is disclosed fig6 is a plumbing diagram of the hydraulic system shown in fig1 through fig3 similar to the plumbing diagram shown in fig4 the hydraulic pump 111 the hydraulic motor 112 the hydraulic pressure accumulator 113 the hydraulic reservoir 114 and the control valve 115 are again represented by simple block symbols the hydraulic pump inlet port 116 the hydraulic pump outlet port 117 the hydraulic motor inlet port 118 the hydraulic motor outlet port 119 the hydraulic pressure accumulator port 120 the hydraulic reservoir port 121 the hydraulic pump and reservoir supply port 122 the hydraulic pump return port 123 the hydraulic pressure accumulator supply port 124 the.