When fluid is delivered from the pump to cylinder 1, the casing of pump 3 is moved to the right. At this, the end of the right-hand cylinder is connected through axial channel a to the tank. When crank 4 is turned, the end of the right-hand cylinder is connected to the pump through axial channel b, a helical groove on the spool and a radial hole in piston 2. At this, the casing of pump 3, owing to the difference in the effective areas of the pistons, is moved to the left.
$3753$SHP,Dr$