Archived from the Tools In Action forum (Milwaukee). This thread is read-only.
I recently purchased the 2755-20 Impact for it’s ‘Best In Class’ torque. What I failed to realize, was that the torque was ‘fastening’ or forward torque. I needed a cordless impact to sit in between my MAC BWP050 and Milwaukee 12v Impact in terms of torque and this fit the bill. When I went to use it, it couldn’t even break a lug nut (torqued to 90 ft-lbs) loose. That’s when I realized it was forward torque and not reverse/break-away torque. I can not return it, so that is why I’m wondering if I can make lemonade out this. Is it possible to reverse the polarity of the motor, or flip the forward/reverse switch so that the max torque is in the reverse setting instead of fastening. I’ve looked at the parts diagrams for the tool, but nothing clarifies the wiring. Before I split this thing open, I’d just like to know it’s even worth attempting.
Hard to say with these brushless motors with all the electronics,
Jimbo
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You might have gotten a bad unit. I have used it on lugs without an issue. When you are using it are you on mode3 ?
Any of the modes.. it won’t brake them loose. Tried it on an X3 strut tower bar bolt (can be stubborn, but not highly torqued), couldn’t brake that loose either.
Dont make sense to buy a tool that can only tighten and no power to loosen sounds like a faulty unit.
Well that’s what I thought, it should have the same power to tighten as it does to break away. But in this case, not so much. Although I can’t say I’ve tested the fastening torque. My guess is faulty unit, it was the very last one they had. So I may have just gotten a bad one.
Did you contact Milwaukee
The difference in tightening vs loosening torque on full power is more an issue of polarity of the impact mechanism. The spring compressed in the mechanism doesn’t work the same both directions. Switching the polarity will either have no effect or stop the tool from working. Either the input power is rectified so polarity doesn’t matter, or the control board will not work on the inverted power.
If you recently purchased it, did you get it new, and have you looked at getting this corrected under warranty? They make good on their warranty, use their online eservice to get started, that’s the simplest way
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