AUTOMATIC LOCKING HUBS SERVICE TIPS

REFER TO THE 1981 LIGHT DUTY TRUCK SERVICE MANUAL (ST330-81), PAGE 3C-28, FIGURE 3C-3K, ITEMS NO. 30 AND NO. 31. THE ADJUSTING NUT, ITEM NO. 31, IS SHOWN IN GREATER DETAIL IN FIGURE 3. WHENEVER SERVICING THESE ITEMS, IT IS MANDATORY THAT THE PIN ON THE WHEEL BEARING ADJUSTING NUT PASS THROUGH ONE OF THE HOLES IN THE RETAINING WASHER, PRIOR TO INSTALLING THE LOCK NUT, ITEM NO. 29. FAILURE TO ASSEMBLE THESE COMPONENTS PROPERLY COULD RESULT IN IMPROPER OPERATION AND OR PREMATURE WEAR. ILLUSTRATION

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.