Method and apparatus for jackscrew with integral drive nut grease fitting

A trailer jack comprising a

• jackscrew assembly comprising
• an outer tube assembly comprising an outer tube with an outer tube access port;
• an inner tube assembly, slidable with respect to the outer tube assembly, the inner tube assembly comprising
• an inner tube comprising an inner tube access port,
• a threaded jack drive nut fixed relative to the inner tube, the jack drive nut comprising a recessed lubrication cavity, the lubrication cavity comprising a grease fitting, such that the inner tube access port is aligned with the lubrication cavity grease fitting, and
• a jackscrew threaded through the jack drive nut, such that the outer tube access port is configured to be alignable with the inner tube access port in order for a lubricant to be applied to the lubrication cavity grease fitting;
• and
• a manual or electric jackscrew drive.

A method of lubricating a jackscrew assembly comprising an outer tube, an inner tube assembly with an inner tube, a jack drive nut with a wall and interior threads, the jack drive nut fixed relative to the inner tube, and a jackscrew with threads which are threaded through the jack drive nut, the method comprising

• providing a recessed lubrication cavity on the jack drive nut, the lubrication cavity comprising a grease fitting:
• providing an inner tube access port on the inner tube, such that the inner tube access port is aligned with the lubrication cavity grease fitting:
• providing an outer tube access port on the outer tube;
• aligning the inner tube access port with the outer tube access port;
• and
• applying a lubricant through the wall of the jack drive nut to the recessed grease fitting, thereby applying the lubricant to the threads of the jackscrew and interior threads of the jack drive nut.