Impact wrenches are often misused by those who don’t know about their special needs. First of all, it is very important to be careful when tightening a nut or bolt with an impact wrench! Cross threading can occur very easily; a novice may also over-torque a bolt or a nut if they don’t know when to stop. To prevent such problems, always be sure to hand-tighten every nut or bolt before using the impact wrench; if you try to start the nut or bolt with the impact wrench, you won’t be able to feel if the threads are crossed. If the impact wrench is not torque controlled – meaning it will stop when the nut or bolt is tightened to a certain torque – you will need to go slowly, and periodically check the torque value of the nut or bolt to make sure you haven’t tightened it too far.
SOURCE: Oiling a Sears 900.275132 impact wrench
use air tool oil and put a couple of drops where the air plugs in.
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