Question about Chicago Pneumatic CP772H - 6 3/4" Heavy Duty Air Impact Wrench

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Spins fine free.when coupled to bolt there's no hammer action.just stalls. Thanks

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Sometimes on most impact wrenches, the air motor drive gear cracks off inside where it couples to the impact mechonisum, causes it (air motor) to spin off center and drag. if this is the case you need an air motor. clean it thoroughly before the final re build. use alot of air tool oil, and grease the impact driver anvels

Posted on Oct 28, 2012

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If debris has been entering tool over time, the vaines will not make good contact to cyl. wall. Flush out gun with kerosine or diesel fuel to clean interior of the gun. If dirty, the first flush will be very dark and every flush after that will become more clear. After good cleaning/flush, add tool oil and retest tool. If tool begins to hit but not full power, you may have to open tool and remove scratches from the vaines. Make sure that you use the largest quick connect fitting possible. Sometimes the tool will loose power if you are using 1/4 inch connections and the vanes are not in good shape. Good luck

Posted on Mar 30, 2011


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