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Need help with old B&D hammer drill.

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taumac

Well-known member
Joined
Aug 30, 2011
Messages
8,104
Location
Brooksville, Fl
I got this from a good friend. Its a old B & D hammer drill/ chisel what I would call a old demo hammer.
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Ok it drills just fine. Now issue I have is how do I engage the hammer function. The box was filled with bits hex and smooth bits. The box also had the wedge shape metal in there. I think it goes in this slot.
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I tried but might not be doing right. I know modern demo hammers have switch or my old Milwaukee you turn collar to turn on/ off hammer. This has no switch. Can someone help me? Thanks in advance.


5 Stitches Garage
http://www.garagejournal.com/forum/showthread.php?t=211899
Florida GJ Group
http://www.garagejournal.com/forum/group.php?groupid=117
 
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dewalt378g

Well-known member
Joined
Mar 17, 2012
Messages
180
I'm not so sure that drift goes in that slot. The brush retaining cap is just below and that would mean that is the comm end of the motor. Definitely do not put the drift in there! Get a flashlight and look inside and tell us what's in there or just take off that access panel. The drift should go in the slot of that tapered chuck you have (the one with the drill bit). The hammer function might work by adding pressure? Show us the other side of the tool.
 
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dewalt378g

Well-known member
Joined
Mar 17, 2012
Messages
180
Ok, so this is what I'm thinking. The front end of the tool where you insert the bit contains the transmission for rotation only. The back end of the tool right in front of your knuckles when held contains the drive line for the hammer piston which is situated on the top of the motor housing. This is what gives this tool it's distinct look. If you pry off that black cap on top of the handle I bet you would see the end of a shaft in a bearing secured by a nut. With no external engagement for the hammer function I am also willing to bet this tool runs in hammer mode all the time. The only difference in operation is in the bit used with the *smaller end* being hex shank (rotation and hammer) and the smooth shank being hammer only.
So, after all of that, I'm sorry to say that there might be something wrong with the hammer drive or hammer piston inside the tool.
 
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