Compact rotary union assembly for a wheel hub

A method of assembling a retrofittable compact rotary union assembly for insertion into a hub housing of a wheel assembly for a work vehicle comprising:

• providing a compact rotary union inner sleeve having a flange portion and a cylinder portion, both of which define a bore and a channel extending from a first port located at the flange portion to a second port located at the cylinder portion;
• inserting the cylinder portion into a v-ring seal until the v-ring seal contacts the flange portion;
• providing a compact rotary union outer sleeve having an outer sleeve bore defining a first circular seal track and a second circular seal track spaced apart by a circular air track connected to a second port;
• inserting a first air seal in the first circular seal track;
• inserting a second air seal in the second circular seal track;
• inserting the cylinder portion into the outer sleeve bore;
• aligning the circular air track with the second port of the cylinder portion;
• and
• inserting an oil seal into an oil seal track of the outer sleeve.

A hub assembly comprising:

• a hub housing defining a cavity;
• a spindle extending through and supported within the hub housing with a first roller bearing and a second roller bearing, wherein the spindle includes a spindle channel;
• an inner sleeve includes a flange portion, a cylinder portion coupled to the flange portion and coupled to the spindle, a bore extending through the flange portion and the cylinder portion, and an inner sleeve channel coupled to the spindle channel and coupled to a first port, the inner sleeve channel extending through the inner sleeve;
• an outer sleeve including an outer sleeve bore and a second port, wherein the inner sleeve is located within the outer sleeve bore and the second port is coupled to the to the spindle channel;
• and
• a v-ring seal located between the inner sleeve and the outer sleeve, wherein the v-ring seal seals an interface between the inner sleeve and the outer sleeve to substantially prevent dust or debris from entering the compact rotary union.