Question about Dewalt DC920KA Heavy Duty Xrp 18V Cordless Drill/Driver

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New grease gun, never used. change mode switch from L to H will not engage all the way. Motor will not start.

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May not be a solution, just an idea
but the switch shits actual gears, the splines may not be aligned enough to allow the transfer.
put it back in low, run the motor a few revolutions to change the alignment of the gears, then try the shift again, like a crash box on a model T

Posted on Aug 17, 2008

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How to wiring the power cord to the F/R switch?


Will need more information: make, model, etc. A corded drill motor can be AC or DC. It can be variable speed on not. An AC motor can be reversed by changing the magnetic polarity of the start winding (switching the two start winding wires). This type of wiring in not usually variable speed. A DC motor is reversed by changing the electrical polarity of the primary motor leads. Usually these type of devices have a rectifier circuit to produce DC voltage and use a PWM signal to develop variable speed.

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Because the Idiots at Black and Decker (Own Dewalt, which tells you volumes!) installed it in China! Really, the Polarity wires are reversed from the Magnetic Motor to your selector switch. Easy fix. Take apart (carefully!!!) your drill (most use Torx or Allen head). Look at the SELECTOR SWITCH. It will have two wires (Black/White). Just firmly-gently pull them out & and reinsert to the OTHER pole-connection. Secure Up...Your done. It will work and you saved yourself 2-4 weeks/mos. of Root Canal...Waiting for your gun to come back. AND You..Fixed It!

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1 Answer

My dewalt slips bad in the drill mode whiile i am drilling in hard material the drill slips real bad and it also does it in the hammer mode. Is that normal


Check the speed selector switch. if it is not fully engaged (usually because of dirt) the gears will slip. cycle the switch a few times.

May 21, 2010 | Dewalt DC920KA Heavy Duty Xrp 18V Cordless...

1 Answer

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They are shot, Some brands will replace them under a year, but most you have to buy new ones. Sometimes it is cheaper to buy a new gun with batteries than it is to buy 2 new batteries. I have about 27 guns under the bench, Nobody wants to buy the batteries, so we just buy new guns. We use them every day and they only last about a year. Sometimes longer.

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1 Answer

Motor turns a fraction of a turn and stops. I've


With an ohmmeter between the prongs of the power plug and the switch turned on, rotate the motor and watch for a drastic change in the resistance. Theresistance should be fairky low.

IF during the rotation the resistance goes way up, there is a failure of an armature winding.
I notice it says variable speed, so the above may not work. The next plan is to bypass the speed control to see if the problem might be with the control... I suspect that is where the problem is. Bypass the control putting full voltage on the motor an see if it runs. If it does, then speed control has a problem.

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3 Answers

Hi from dublin,my third dewalt dw054 impact 14.4v cordless drill,they all lose power,as if the switch does not work,but i think the motor is gone.. They all went the same way after two years..great drill...


Hi there, the first thing you need to do is check the carbon brushes, there will be two of these one at each side of the motor, if these are ok then test if power is getting to the motor, to do this you will need to split the casing on the tool in half. You may need a torx driver to undo the screws on the casing. Once you have removed the screws, very carefully split the casing making sure you leave the gearbox assy, motor and switch in the other half. Insert battery onto the unit and get someone to hold the motor in place just incase the machine starts. get a voltmeter, follow the wires from the switch to the motor and where the wires attach to the motor put the probes of the voltmeter and pull the switch to engage it. You should be gettting a good voltage now, If you are then the switch is ok. hope this is of some help

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1 Answer

Gear grease for hilti drill/driver


The genuine hilti grease isnt that easy to get. but I have used a stadard lithium grease in the past without any problems.

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1 Answer

The motor turns but the clutch will not engage


Take the drill out of the hammer drill setting when in reverse.  Using the drill setting with the speed on 1 will give the power to free the bit.  If the clutch will not engage, GENTLY but firmly switch between forward and reverse.  This should work just fine.   I hope this solution brings you success!  Best Regards,  Michael Mittelsdorf

Dec 26, 2008 | Drills & Drill/Drivers

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