The present invention is directed towards a hydraulic power unit including a
housing, an internal hydraulic power means, an external hydraulic power means,
and a mechanical power shaft associated with the hydraulic power means. In addition,
the hydraulic power unit comprises a transducer adapted for measuring torque mounted
in the housing in a non-contact relation to the mechanical power shaft adjacent
a portion of the shaft imposed with a magnetic field. The hydraulic power unit
further comprises a controller associated with the transducer to monitor the measured
torque and adjust the operation of the hydraulic power unit accordingly.
