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Is Hammer adjust collar attached to chuck?

On an old B&D HAMMERGUN 5078. I am trying to remove the chuck, but it is stuck on really good. Does the hammer adjust collar come off when removing the chuck? Thanks in advance. Bill

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I looked at a old schematic for the 5078 and it appears that it might come off after chuck removed. The chuck is threaded and if you have the 2 speed model, shift it to low and put a bent handle allen wrench into the jaws and chuck on workbench or block of wood with long portion at approx 30 degree angle and strike the handle, you will be hitting it counter clockwise to remove.

Posted on Jul 25, 2009

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1 Answer

Why does my chuck keep loosening


First check whether you have the correct transmission setting for the bit you are using. This may affect the range over which the chuck operates and how it locks onto the bit. A conventional small-diameter drill bit may not work with a hammer drill setting. If the setting is correct, then either your hands aren't as strong as they used to be and you're not getting the chuck tight, or the chuck is worn and no longer has enough friction to hold.

Try this diagnostic: when you put a bit in, use a fine-tip felt marker to draw a line from the chuck collar (the part you turn to tighten or loosen) to the chuck baseplate. If the bit comes loose, check to see if the collar is still lined up at the same place relative to the baseplate. If it is, the chuck pieces are slipping inside; perhaps the transmission setting is incorrect for the bit chosen. If the collar has worked loose (the marks didn't stay lined up), the threading on the collar or the parts it engages could be worn.

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Drillbit stuck


Can not see what model you have. Is it a keyless chuck or an SDS chuck? With a keyless chuck hold the machine in a vice by the drill bit. now tap the chuck with a hammer or pin punch & hammer. DONOT hit the chuck on the jaws gut on the rim around them. I have had success using this method. If it is an SDS type chuck pull the chuck cap up as far as possible along the bit them if there are any ring springs you will have to try remove them then slide the sleeve up the bit, now you should be able to remove any steel balls. If the bit does not come out now hold bit in vice as before and tap on tool holder.

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How do I use the adjustment ring on my ? back out the screws?


You're in trouble. You took the screw out and now the pin is past it's stop. You now have to remove the chuck and then pull the collar of and rotate it so the arrow on it points toward one of the numbers on the tool. Then put the two screws back in put the chuck back on and you'll have full range of adjustment in the collar. The problem is now that you overrotated the collar the clutch is at it's weakest setting and the chuck will likely be really hard to remove! Good luck!

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The chuck has been pulled off. Whats the easiest way to reinstall it on my Bosch 11236vs Hammer Drill?


The chucks on the 11236 are designed to be removed, if you were not aware of this it may look like the tool has failed, it has not. To replace the chuck set the chuck back on the shaft of the tool, grip the outer collar of the chuck and rotate it counterclockwise while pushing down .The chuck will drop into a set of grooves on the shaft and lock there, give it a wiggle after to make sure its seated. Sometimes it takes a couple of tries to get it. To remove it just grip the collar turn counterclockwise and pull up, the chuck will come off.

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1 Answer

How do i remove old chuck from drill


Remove the REVERSE-THREAD screw at the bottom of the chuck. Set the clutch collar to the highest setting, and set the gear to the slowest setting if this drill has a 2 speed transmission. Remove the power source! Get the biggest allen wrench you can fit in the end of the chuck(the shortest leg) and tighten the chuck down around it, allowing the jaws to rest and tighten on the flats of the wrench. Lay the drill on its side(chuck toward you, handle to the left, and allen wrench to the left, horizontal to the deck. Then with a hammer(soft hammer if you care about the allen wrench) quickly and deliberately hit the allen wrench in an attempt to cause the allen wrench to spin counter clockwise. Let me know if this works for you!

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I have a really old Milwaukee 3/4" rotary hammer, I don't know how to get the bit out, any help would be greatly appreciated


if it does'nt have a keye'd chuck, it may have arubber collar,spary some lube down into chuck and firmly push down,w handle agains't ground or other firm surface

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How do I remove drill bit from chuck attachment?


pull up (away from tool) on collar where bit enters tool, the bit should slide out easily; if not try tapping firmly (NOT HARD) on the bit with another bit or similiar object before or during pulling collar

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1 Answer

Chuck is locked open


you have three jaws in your chuck, one of them will probably have a small burr on it causing it to stick.

try this...

tap the chuck with a small hammer then try to use the chuck key gently in the opposite key hole to the hammer blows. turn chuck though 120degrees and repeat.

if this does not work chucks are fairly universal and easily replaced (i would recommend a keyless jacobs). you can get the old one off by removing the ph2 (phillips) machine screw inside the centre of the chuck... be careful!! this screw is usually soft and counter threaded... when screw removed bash off the chuck with a hammer and cold chisel...

good luck

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