Guess they made another design change - key or tab washer keeps the nut from rotating.
This is from our manual:
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For adjusting bearings or replacement of removed hub, follow
procedures below:
1. Place hub, bearing, washers and castle nut back on axle
spindle in the reverse order from which they were removed. Castle nut should be
torqued to 50 ft.-lb. Hub will rotate during this process.
2. Loosen castle nut to back off the torque.
3. Tighten castle nut finger tight until snug.
4. Insert cotter pin (or locking tang if equipped with Super
Lube). If cotter pin or tang does not line up with hole, back castle nut up
slightly until pin or tang can be inserted.
5. Bend cotter pin over to lock nut in place (or locking
tang in the case of Super Lube). Nut should be free to move with only the
cotter pin keeping it in place.
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