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wingless' Bosch RH540M SDS-Max Combination Rotary / Hammer

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The latest remodel project for me and my daughter requires a SDS-Max hammer tool. I selected the Bosch RH540M and decided on the rebuilt tool available from CPO Outlets on Amazon for the huge cost savings.


That selection was a great decision. The tool arrived quickly. The tool has a new enclosure, cord, case, manual and grease tube. The operation feels like a new tool. The tool includes a one year repair warranty.


Here is the manual.


The tool has a collar sleeve that is pulled back to the handle to insert or remove the SDS-Max bit. The bit splines are keyed to only insert at one orientation. There is a large paddle switch for on/off, easy to operate even wearing gloves. The auxiliary handle is easy to position at any 360° orientation, twist to loosen / tighten. There is a variable speed numeric speed dial control. The large selector lever permits changing the mode, from hammer drilling to hammer, also permitting the rotation of the bit to be selected prior to hammer, 12 positions available.


The tool has a clutch for hammer operation, requiring the bit to be pushed into the surface to start the hammer.


The first operation was bathroom floor tile removal. That went fine, with the biggest butt pain being waste removal. 


Tool operation should include protection for hearing, eyes and skin.







Bosch 1.jpg


Bosch 2.jpg


Bosch 3.jpg

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  • wingless changed the title to wingless' Bosch RH540M SDS-Max Combination Rotary / Hammer

My SDS-Max tile and thinset removal tool has been VERY handy. I have used it to remove two houses of wall to wall tile. It works great to remove tiles and thinset, usually intact.


The tool is uncoated steel that will rust, so maintain an oil coating whenever the tool is stored for surface protection.


The only deficiency on this tool are the fasteners retaining the blade to the shaft. The fasteners get unbelievably hot during usage, greatly exceeding the Nylock nut 220°F maximum operating temperature, permitting the nuts to loosen and the bolts to break.


Any decent size project will quickly consume both sets of fasteners.


My solution was instead to switch to hardened metric M10-1.5 fasteners and use distorted thread lock nuts. Those nuts don't have a specified maximum operating temperature. That hardware change was effective, using this Class 12.9 M10-1.5x40 bolt, this Class 12 M10-1.5 nut and this Class 10 M10-1.5 distorted thread nut.




SDS Tile Tool 2.jpg


SDS Tile Tool 1.jpg


SDS Tile Tool 3.jpg


SDS Tile Tool 4.jpg

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Great idea.  I had something similar I used years back to remove a floor.  Mine ended up holding up but years later, I took it out of the drawer and it was all rusty.  Great idea with oiling up, never thought about that when I was done.


Also great to know about the hardware because i have heard the same issue with other.

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The rusting on mine was also discovered after the fact. My resolution for eliminating the rust was to first use a utility knife blade to hand scrape the surface, then sanded to attain the condition shown in the images. It has maintained in that condition for over a year w/ the light oiling.

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