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The hub assembly is not removed. There are 2 types. One just slides off and the other you have to remove the wheek pearings. Here are the instructions for both..
K1 and 2-Series
Raise and support the front end on jackstands.
Remove the wheel.
Remove the caliper. Do not disconnect the brake hose from the caliper. Use a piece of wire to support the caliper, do not let it hang on the hose.
Remove the rotor.
Installation is the reverse of removal.
Remove the hub nut and washer. Insert a long drift or dowel through the vanes in the brake rotor to hold the rotor while loosening the nut.
Using a puller, force the outer end of the axle shaft out of the hub. Remove the hub/rotor.
Position the shaft in the hub and install the washer and hub nut. Leave the drift in the rotor vanes and tighten the hub nut to 173 ft. lbs. (235 Nm).
Remove the drift.
Install the wheel and lower the vehicle.
Above is the description from tehs ervice manual of how to remove the front rotor on an 8600 GVW K2500 pickup; note it is pressed in place and a wheel puller is required for removal...