20 Most Recent Dewalt DC925B Heavy Duty Xrp 18V Cordless Hammerdrill/Drill/Driver Bare Tool - Page 8 Questions & Answers

The battery is defective.

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You need a "chuck Key"

A worn gear could be or switch problem

Beware meanwhile there are much parts for this machine not more available.

Dewalt has a number of products with 315 in them. Most Dewalt tool manuals are available here: http://servicenet.dewalt.com/Home . There is the DWE315K ocillating multi-tool; see http://servicenet.dewalt.com/Products/Detail?isId=true&productNumber=DWE315K&selectedType=25371 . Dewalt has a type 1 and a type 2 with the DWE315K model number. The direct link to the manual for Type 1 is http://documents.dewalt.com/documents/English/Instruction%20Manual/N252379,DWE315.pdf . Please look at the product again and check the full model number and the type information. Add a comment if you have a different oscillating tool model. I hope this helps. Cindy Wells

Most likely it's the battery. If you can find someone else with the same system then maybe they could check it for you. Unfortunately, you have the 20 volt system which isn't nearly as common as the 18V. Or you could bring it to someplace like Batteries + Bulbs (If you have them around you) and they will tell you what's not working.

Is this a cordless?

turn the selector lever from hammer / drill to hammer it is a second lever close to the gear box of the drill

Try this web page. http://powertoolshelp.com/dewalt-dc750ka-cordless-drilldriver-users-manual

You should be able to get the info from Dewalt.com

Learn to speak and spell english

Have you tried going to dewalts web site and downloading the instruction manual.

Go to ereplacement.com and put in your model number and they should have a breakdown and should have the part.