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Diagram 99 gmc w4500 injector pump - Cars & Trucks

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Posted on Jan 02, 2017

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SOURCE: how to remove the rear drum off a GMC W4500

This is a full floating axle. The drum and the hub come off together. The axle must be pulled by removing the bolts or nuts on the hub center.Then the large nuts behind it must be removed. Now the hub and drum assembly can be removed. If you've already done that and the drum still won't come off back off the brake adjuster as far as possible. A ridge of rust sometimes forms inside the lip of the drum that will keep it from sliding off until the shoes are backed off. Very worn shoes can also literally wear grooves into the drum and make it impossible to remove until the adjusters are backed all the way off. If everything is rusted solid and you can't get anything to move check with the owner and, if it's O.K. with him, take the sawsall or the torch and cut the lower part of the backing plate out of your way. Then cut the adjuster in half. Now the drum will come off.

Posted on Mar 20, 2010

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