20 Most Recent Dremel 300-N/55 300 Series Tool Kit Questions & Answers


When a plug wire is replaced say on a stereo there is no hot or neutral it makes no difference which wire goes where there are instances where hot and neutral are a concern but not with a 2 wire plug that is not separated by color if you have 2 white or 2 black then there is no order just wire and go.When color is in question the wires will be colored I hope this helps.

Dremel 300-N/55 ... | Answered on May 05, 2014


The "nub" on the shaft lock assembly (internal) has worn down and the assembly needs to be replaced.

If you feel competent to open your Dremel yourself (and it's not on warranty) then order the shaft lock assembly from Dremel (early 2011 price: $1.25, not sure how much postage & handling might be). After opening the tool you will find a metal ring and a small piece (the lock) which it holds in place around the shaft where the lock button is located. Remove the old pieces and replace with the new ones and reassemble the tool.

Otherwise you can send the tool to Dremel to be fixed.

Dremel 300-N/55 ... | Answered on Mar 07, 2013


Well, you do not specify what the issue is, exactly. Dremel units had motor issues on some units. Something about the field coils failing...

Dremel 300-N/55 ... | Answered on Oct 28, 2011


You may have to change mandrel to a smaller one. There should be 2,if not 3, in your kit. I ended up buying the 4486 keyless chuck to save time on tool changes.

I hope this helps. M

Dremel 300-N/55 ... | Answered on Sep 22, 2011


unplug tool and while holding the spindle lock loosen the screw in the center of the rubber barrel to reduce the diameter and this make instal/removal easy. don't forget to retighten before using.

Dremel 300-N/55 ... | Answered on Jun 20, 2011


It is with regret that I must inform you that you will probably have to replace the whole unit, the field coils will have blown and almost certainly the armature - your did give it a 100% over voltage shock. The prices of the parts will be more than the cost of a new machine.

Dremel 300-N/55 ... | Answered on Mar 29, 2011


Try at eReplacementParts.com : Power Tool Parts and Tool Repair Diagrams

If you need more help post back!
Thumbs and testimonial are welcome!

Dremel 300-N/55 ... | Answered on Mar 07, 2011


Something similiar with a belt sander on / off switch that had dirt inbetween the contacts in the switch. After cleaning the switch contacts it worked.

Dremel 300-N/55 ... | Answered on Feb 25, 2011


Your best bet would be to go to dremel web site and do a replacement parts search for that model.It will bring up there home page .From this page you can go under manuals and parts list and a place to order the part from and a contact to make sure you get the right thing.Hope this helps you out.

Dremel 300-N/55 ... | Answered on Feb 13, 2011


Trying to fix a similar issue. The pin that gets pushed in by the button (and returned by the spring) seems to be fine. The hole in the rotating shaft that the pin fits into, however, is in the wrong place, so the pin never goes into the hole! All I need to do is somehow pull the whole front part of the shaft out about 1/16th of an inch, and it'd be fine. I just can't seem to budge it though. Any tricks, anyone?

Dremel 300-N/55 ... | Answered on Feb 12, 2011


Hi, W/D here.

The collets are a friction fit, and tend to bind after being left in one position for a time.
Try this: Tap the bit, if there is one in the chuck, towards the motor. This sometimes creates the slack needed to remove the bit. Put a little light oil on the collet before you replace the bit.
If no bit is in the collet, try a light oil, and tap directly on the collet with the chuck collar off. Also, tapping from different angles after adding the oil will help to dislodge the collet.
One other method is to set and hold the shaft lock after oiling, and try to rotate the collet slightly while exerting an outward (pulling) force with pliers or channel locks. Be careful with this method, as too much force can result in damage to the collet.
Best regards, --W/D--

Dremel 300-N/55 ... | Answered on Feb 05, 2011


Make sure the brushes move freely up and down the holders.
Clean the commutator. An eraser off of a #2 pencil works well to clean the com

Dremel 300-N/55 ... | Answered on Jan 06, 2011


The on/off button (speed button) can be bad.

Dremel 300-N/55 ... | Answered on Nov 08, 2010


I must apologize I have searched all parts manuals that I have access to includeing google and all i can find is the 300-N55 is no longer available and switches are obsolete.I also couldn't find any parts to sub for it. Sorry.Hope I can help you in the future. Thanks.

Dremel 300-N/55 ... | Answered on Nov 08, 2010


If you do open it, you can get those little screwdrivers at most hardware stores, buy the bits, or the whole thing, sears has them too. No. T5 through T10 are the smallest, the T5 is about 1/16 of an inch. Or smaller. Take out the screws, twist off the tip and then open the whole thing up, If you get it back together and it is spinning the wrong way, flip the motor over.You got it in backwards, or mark it before you take it out. Hope this helps.

Dremel 300-N/55 ... | Answered on Oct 19, 2010


loosen the screw on the top of the mandrel. pull drum off rubber insert. the mandrel works by expanding and creating pressure on the sanding drum when screw is tightened. it does take a little pressure

Dremel 300-N/55 ... | Answered on Oct 16, 2010

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