Question about Chicago Pneumatic 1/2" Air Impact Wrench
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Posted on Jan 02, 2017
there is a rebuild kit available anywhere they are sold, biggest reason for power loss is the vanes are either worn or sticking, if the hammer is greasable take it apart and check for wear, some a grease and some are oil bath, replace the screens in the trigger and insure all is clean, use a good air tool oil as it wont thicken
Posted on Dec 05, 2009
That impact is distributed by Harbor Freight, though I doubt it is 25 years old. They may have a rebuild kit there, but a new one just like it is around $35.
is priced at $24.99
Posted on Mar 25, 2010
I used to repair these impacts for a living. Simplest first thing to do is back off the three 1/8" set screws in the back a couple turns. Pour a little varsol into the air inlet and plug it in. run the gun until your hand is black, (wear a glove). Once the varsol stops disconnect the air, add a few drops of air tool oil and tighten the screws slowly and evenly. You will hear the impact rpm increase. If your gun doesn't speed up to it's original scream you will have to remove the four 5/32" set screws and see what's worn. To open it hold the impact by the nose 3" off the table and position a center punch in the hole of the anvil shank with the same hand and hit it with a hammer hard enough to overtake the spring. The guts should drop on to the table in tact. The guts are in twp parts, the hammering mechanism, and the air motor. The three 1/8" screws hold the motor together. You will soon see the problem. Take the back off the air motor and it will show your if the veins are worn. Cjeck the end plates for wear. You can turn the end plates down on a lathe if available. As a rule of thumb, if the anvil shank is dry buy a repair kit, if it's wet, buy a tune-up kit. If the ring on the anvil shank doesn't turn, buy a repair kit and change your sockets. When rebuilding these front seal often leaks. These impacts are supposed to use 30 weight oil, but a mix of Ingersol Rand grease and 30 weight oil, ( just till it's slightly runny) will stay much longer. Assembling the anvil assembly can be tricky until you figure out how to hold the shank and two pins with the same hand. Good luck.
Posted on Sep 16, 2011
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