Boom Assembly

SWING MACHINERY

Swing Machinery Components

Two planetary swing gearboxes, each driven by a vertically mounted motor, are mounted on either side of the revolving frame. Dual output shafts from each gearbox are splined to pinions which engage the swing rack. Bolt-on mounting permits easy field exchange or replacement of either the planetary gearboxes or the splined pinions. The four pinions result in lower shared tooth loads for longer pinion and rack life. A spring-set, air-released, disc brake is mounted on each of the two swing motors.