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You usually test bearing preload BEFORE you tighten the big axle nut, just in case you need to take it apart to add/remove shims. Here is how it "should" work: Put one side on using one shim between the brake backing plate and trumpet housing, and one between the backing plate and bearing retainer. Tighten the bearing retainer down and put everything back together on that side (just put the big axle nut to hand tight at this point). Now, repeat on the other side, but add about three shims in between the brake backing plate and bearing retainer to start with. Tighten the bearing retainer pretty snug, grab the end of the axle sticking out, and push/pull and see if you have any movement. No movement - BAD, quite a bit of movement - NOT GREAT, slight movement (and I mean SLIGHT) - BEST. You will probably have to remove the bearing retainer to add shims a few times to get it perfect - be prepared and don't get in a hurry. Now that you have just SLIGHT in/out movement, turn the axle any direction and you should see the other side drum spin the opposite direction. Good job! NOW, put the brakes and drum on, the tires on, and tighten the big axle nut up to 450 lbs. You do have some mass to deal with when you are testing by spinning the axles, add tires to that and you have even more mass. However; you should be able to spin them by hand fairly easily. I know you don't want to hear this, but I would take it apart again and verify you have the preload set right, it doesn't sound like you do to me. Good luck,
Dan
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