Global Machinery Company Sierra 1999 - Manual (Page 283)

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Turn the wheel wrench clockwise to raise the jack lift
head a little.
If your vehicle has wheel
nut caps, loosen them by
turning the wheel wrench
counterclockwise. If you
have a center cap with
wheel nut caps, the wheel
nut caps are designed to
remain with the center cap.
Remove the hub cap.
If the wheel has a smooth center piece, place the chisel
end of the wheel wrench in the slot on the wheel and
gently pry out.