Top 20 Craftsman 1/2" Impact Wrench Questions & Answers

If you are trying to loosen or tighten a bolt or nut the the impact just stops more than likely there is a problem in the hammer (clutch) mechanism (items# 24 through 30), there could be broken part causing the mechanism to jam, the hammer (clutch) needs to hit and then slip to let the motor turn as they are directly coupled (no gears). On the flip side in the motor there are vanes (blades)
(item# 17) that need to have free movement and could also cause a condition were the motor could have low power or cause a locked condition.

Follow this link for the owner/parts manual:

Craftsman 1/2"... | 1,016 views | 0 helpful votes

buy a better gun the cheap ones dont have any power

Craftsman 1/2"... | 324 views | 0 helpful votes


Craftsman 1/2"... | 568 views | 0 helpful votes

I found these posts when looking for a repair kit or parts for my Sears 756 CP. Appears I need the fastest moving most common to fail NLA part. Had this gun since new. Used for years in the shop then put it in the bottom of the tool box when the valve went out years ago.

In a clean up round I pulled it out to make the decision fix or recycle. One of those not wanting to throw out a perfectly good impact I started looking for parts. I did order a valve from a 744 and will be trying it. Since the shaft is shorter I was going to use the shaft from the 756 and cut it to make up the difference. Do not know yet if this will work.

In the mean time I started looking through one of the spare hardware drawers and came across a oil metering valve seat from a rotary engine. It fits rather snugly on the actuator shaft from the 756 and with a washer works. It is basically a jet encased in rubber.

This 756 is back up and impacting well. So if any one is still looking for the throttle valve for your 756 I can provide you with something that will work. Do not know what the life expectancy will be though. Since this will not be the everyday gun should last for a while.

Mazda part numbers that should work N236-14-633A - N326-14-633

Craftsman 1/2"... | 374 views | 0 helpful votes

check the specs and make sure your not pushing it harder than it was built for.
replace the brushes

Craftsman 1/2"... | 91 views | 0 helpful votes

how much oil did you put in? you are only supposed to put a few drops in the air hose coupler.

Craftsman 1/2"... | 1,203 views | 0 helpful votes

you can download this from

Craftsman 1/2"... | 231 views | 0 helpful votes

  • There are no chucks with these newer impact wrenches. See that little ring on the tip of the socket shaft? That is a lock ring and that is what holds your sockets in place. You will want to keep a few 1/2 impact wrench lock rings around. There is a tool they make to aid in removing and replacing those rings but it is not necessary. You can use a small flathead screwdriver and walk the old one off and the same for replacing it. All you need to do is snap a socket on there real good and let'er rip.

Regards, Tony

Craftsman 1/2"... | 466 views | 1 helpful votes

Just put 3-5 drops of air tool oil down the air inlet coupler and then run the gun for 5 seconds. Do this everyday that you run the gun for best results.

Craftsman 1/2"... | 671 views | 0 helpful votes

if you dont use hand tools often you should never trust the torque from impact wrench you should always recheck with tension wrench for correct torque specs
or at least hand tools such as breaker bar, spanner, ratchet
depending on what your doing up and diameter of bolt or studd for what application

Craftsman 1/2"... | 562 views | 1 helpful votes

has it been oiled was it oiled when you took it apart things to check for also does it have a adjustable torque on it

Craftsman 1/2"... | 460 views | 0 helpful votes

fill down the air pipe wit penatrating oil hold trigger and keep movin forward and reverse wen in frees up fill wit airtool oil

Craftsman 1/2"... | 1,209 views | 0 helpful votes

I just bought one of these also. Manual says oil goes into "the air inlet" which I'm thinking is where you attach the hose. That way the oil is sprayed throughout the interior of the gun once you run air through it.
Question for you: I can't get an impact socket onto this gun, almost seems like the square hole is too small. (yes, both are 1/2" drive). How do you get a socket on this stupid thing?
(man that sounds like I'm an idiot, but I've spent a half hour leaning all my body wight, wiggling, etc. and can't get a damn socket on)

Craftsman 1/2"... | 16,140 views | 5 helpful votes

fill it wit oil hold in triger and flick between forard and reverse should free up the vains inside

Craftsman 1/2"... | 509 views | 0 helpful votes will show you what they have

Craftsman 1/2"... | 95 views | 0 helpful votes

Try turning your line air pressure up to at least 90 pounds
Most lug nuts are tightened to 85 pounds or higher

Craftsman 1/2"... | 388 views | 0 helpful votes

I have the same problem, brand new impact wrench, brand new impact sockets, but can't get a socket onto the gun. Leaned on it with all my weight, wiggled, nothing. and yes they are both 1/2" drive. WTH?

Craftsman 1/2"... | 4,438 views | 3 helpful votes

Make sure you have at least 90 pounds of air and if you do you need to oil the wrench air tool oil pour some in the where the air line hooks up ..air tools need to be oiled daily cause compressed air cause water vapors to build up when you use it and then when it sits it begins to rust a bit and the oil stops this ...

Craftsman 1/2"... | 1,453 views | 0 helpful votes

It needs to be taken apart and cleaned then lube it with air tool oil and reassemble it should make a big difference

Craftsman 1/2"... | 620 views | 1 helpful votes

The air motor is probably shot. Turn the socket a few revolutions by hand, and see if it frees up and starts working. A couple of firm raps on the workbench might help. Otherwise take it apart and see whats up. You'll probably find worn vanes or a vane stuck in the rotor. There will be several vanes, and they must slide in and out of the rotor easily. If you arte lucky you'll just have to clean out, lubricate, and reassemble.

Craftsman 1/2"... | 495 views | 0 helpful votes

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