Here are the mods that are required to prep the axle hub.
1) Machine off the large outer spoke ring section of the brake drum mounting plate. This is not a critical operation, you just need to leave enough of the brake mounting plate to secure the brake drum to it. Mine is approximately 4.5” in diameter. The outer spoke ring section that is removed may be discarded.
2) Machine off the weld holding the brake mounting plate to the hub. Remove only as much material as is needed to remove it. Retain the brake mounting plate as it will need to be re-welded back onto the axle hub in its original position.
3) Machine off the weld holding the small spoke flange and remove the small spoke flange. Remove only as much material as is needed to remove it. This small spoke flange can be discarded.
Following are a few pictures that Mike provided showing some of the above steps.
The next step is to fabricate a new mounting plate that will be welded onto the axle hub and will hold the lug nut studs used to secure the trailer wheel. Mike ordered a round steel plate from McMaster-Carr for this. Mine currently measures approximately 0.47” thick by 5.75” in diameter. This plate needs a center hole cut in it to fit snugly over the axle hub, and four holes for the lug nut studs. Four larger holes were also drilled into this plate in a somewhat feeble attempt to reduce the weight a little bit.
This new mounting plate needs to be positioned onto the axle hub so that the center of the trailer wheel is exactly centered where the center of the stock rim was located. This mounting plate is then welded onto the axle hub on both sides of the plate and trued up to ensure that the trailer wheel will have no wobble to it.
The lug bolt studs are then pressed into position. The next step is to weld the brake mounting flange back into its original position and true it up so the that brake drum does not wobble. There is not a lot of room between the new wheel mounting plate/heads of the lug nuts studs and the brake mounting flange, but there is enough space to allow the brake drum mounting nuts to be accessed and secured.
Here are a couple of different views to show how everything goes together.
More to come……….