The M81120 is a Reversing hydraulic pump for use with steering systems equipped with 4.9–14 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

Type 1 Hydraulic Pump and Corepack Application Table

Corepack Used
S1 or S1G
S2 or S2G

Ram Capacity
4.9in3– 10.5in3
4.9in3– 14in3


(80cc – 172cc)
(80cc – 230cc)

Maximum Stall Pressure at 12V
750psi (50bar)
750psi (50bar)

Peak Flow Rate (no load)
67in3/min (1000cc/min)
67in3/min (1000cc/min)