The present invention provides a device or apparatus for assisting in the operation of a wheelbarrow having a tray, handles and at least one front wheel. The present device may generally include a motor, a power/fuel source, a drive wheel and a drive mechanism for rotationally coupling the drive motor to the drive wheel, the drive wheel able to contact the front wheel of the wheelbarrow in a direct wheel-on-wheel engagement when the present device is attached to the underside of the wheelbarrow tray. The present device may be slidingly attached to the wheelbarrow, such as by one or more slides, to permit its movement forward and backward for the drive wheel to engage or disengage the front wheel. The present invention further includes the present device attached to a wheelbarrow or tray, and methods for assembling and operating the device and attaching it to a wheelbarrow or tray.