Abstract: A self-erecting mast and boom for a lift crane including self-storing mast cylinders for erecting the mast and rotating a pivoted boom carrier into position to receive the boom which may then be raised by the boom hoist mechanism of the crane. A back hitch assembly including hydraulic cylinders is employed to initially raise the mast and the gantry members which may be lowered into horizontal position to reduce the crane profile for self-propelled transport between job sites.

Abstract: A wheel speed sensor is adapted to be mounted entirely within the bored end of an axle. The sensor comprises a rotor, stator, permanent magnet and coil, all compactly mounted in a hermetically sealed housing. A retainer is provided within the axle bore for securing the sensor against rotational and axial movement relative to the bore. The rotor shaft which is mounted within the housing is provided with an extension which passes in sealed relationship through the housing and beyond the end of the axle. A connector arm is attached to the rotor shaft extension for engagement with the wheel hub cap.