Type 1 Pump 12volt. Reversing hydraulic pump for use with steering systems equipped with 4.914 cubic inch (80cc 230cc) hydraulic steering rams.. The Type 1 hydraulic drive is compatible with both S1/S1G and S2/S2G corepacks. Use the table below to determine the Type 1 hydraulic drive's capacity when used with each corepack. Corepack Used S1 or S1G. Ram Capacity 4.9in - 10.5in. (80CC-172CC). Maximum Stall. Pressure at 12V 750psi (50bar). (no load) 67in/min (1000cc/min). Corepack Used S2 or S2G. Ram Capacity 4.9in - 14in. (80cc - 230cc). Maximum Stall. Pressure at 12V 750psi (50bar). Peak Flow Rate. (no load) 67in/min (1000CC/min)