![]() We take all feedback seriously, and our teams are actively investigating this claim. Milwaukee is investigating the issue, and provided the following statement: I am sure that the issue would have been noticed and investigated as users and service centers reported tool failures to Milwaukee.īut from what I can tell, TTC’s quick, diligent, and thorough attention to the matter alerted Milwaukee Tool and end users about it earlier. They went above-and-beyond to serve and protect the interests of their audience and end users. TTC put a lot of work into investigating, replicating, and sharing about the Rev B models in a responsible and respectable manner. It’s unfortunate, but these things happen. But, even with such efforts, things won’t always go according to plan. I would give Milwaukee engineers the benefit of the doubt they could have taken every precaution to ensure the B model performed as well as the A model under any and all conditions. But, it’s showing up as users put the revised 2767 impacts to work, and that’s a problem. Whatever the cause, this seems like the type of problem that no amount of modeling, simulation, or in-house testing could have predicted or revealed. If I had to guess, I would suspect an unaccounted-for vibrational force (possibly from the bushing placement) that is increasing the load on the planet pins well beyond design specs. I would urge everyone to avoid jumping to any assumptions. I have been looking at everything from planetary gear load distribution modeling to failure analysis, and there are so many things that can go wrong. It is unclear what prompted Milwaukee to redesign it. It’s not the only way a planetary gear box can be configured, but it’s tried-and-true. The 2767’s “A” design’s powertrain is relatively standard for impact wrenches and in general. The planetary gears are positioned beyond the rear radial support. Model B: The hammer assembly is radially supported at the rear with a bushing (rear washer). The planetary gears are positioned between front and rear radial supports. Model A: The hammer assembly is radially supported at the rear with a large bearing. The hammer assemblies are held concentric at the front housing via a bushing. Model B: Planet gears are slipped onto planet pins, which are fixed to the cam shaft on one end.įor both versions of the tool, the rotor is held concentric at the front via a bearing (part 29 in both diagrams above) that is seated at the rear of the gear case (not shown here), and at the rear via the end cap. Model A: Planet gears are arranged within a cage structure, with the planet pins slipped through and supported on both ends. Milwaukee M18 2767 Impact Wrench Powertrain – Rev A (top), B (bottom) A Closer Look at the Powertrainįrom what TTC has seen with high repeatability, the planet pins are bending and breaking after high torque applications. ![]() A ring (68), described as the rear washer in the parts diagram, serves as a spacer in the rear gear case (20) and also a bushing. The planet gears (14) slip onto the pins and are held in place via a large washer (69). ![]() Looking at the B model’s drivetrain, the cam shaft (12) has the planet pins pre-installed via press-fit. A washer (16) between the gear cage and bearing retains the planet pins. The rear end of the cam shaft is centered in the rear gear case (20) via a large bearing (17). Looking closely at the A model’s drivetrain assembly, the cam shaft (12) houses the planet gears (14) in a one-piece cage, with the planet pins (15) slip-fit and supported on both ends. The newer revision has serial numbers with the prefix H96B, or “B”. We’ll call this the “A” model or revision. The previous 2767 design has serial numbers with the prefix H96A. TTC discovered that Milwaukee updated the 2767 impact around August 2022. I was shown evidence of partial failure, which had resulted in diminished performance, and also complete failure where tools were rendered completely non-functional. More significantly, there have been reports of mechanical failure. Broken Gear Pins in a Newer M18 Fuel 2767. From the footage I examined, the tools seem to stutter for up to a few seconds at low speeds before operating at full speed. Some tools appear to suffer from intermittent power delivery when the trigger switch is first pressed, only in certain modes, and temporarily.
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