An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert who has answered 200 questions.
An expert whose answer got voted for 20 times.
Re: dewalt dc 988 cordless drill
Posible motor problem, the built in magnetic ring in the motor may broken inside or just to much dust in it. advice when replacing motor also replace th switch for the cost $132.00 plus tax canadian. thanx
We.ve the same problem with those Chinese batteries and find that this problem is quite wide spread with many brands using these batteries. I'm speaking from experience with our battery factories. No quality control!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
It's not unusual for Dewalt triggers to go bad and it appears you have correctly tested the trigger. You can test the motor by wiring it directly to the battery but hold on to it and only give it a short burst of power so it doesn't spin out of the case. Dewalt triggers are fairly easy to find online but shop around, they're not cheap.
Check electrical contacts in drill body where battery connects.
Check wiring inside the drill, trigger and check also brushes.
You do not have to invest 329, you can buy "body only" machine for few bucks and reuse your charger and battery packs.
Easiest and safest:
take the tool and batteries to nearest shop where they sell Dewalt. Ask the guy to let you use their batteries in your tool and vice versa, your batteries in their tool.
DYI procedure:To check batteries:
- if you have some multimeter, try to measure voltage and if possible also amps (but only for a fraction of the second, if battery is good, amperes shoudl jump up very quickly)
- if you have no multimeter, try to find 12V bulb (check spare bulbs for your car), use wire to connect and it should light up.
To check tool:
open it up, take some 12V DC source, put wires on contacts inside the handle where battery connects. Pull the trigger and it should work. you can try to put wires directly to contacts on the motor. Follow cables from the switch to motor.
If your warranty has expired, you're best off buying a new drill. Replacing batteries will quickly add up to the cost of a new drill.
I know they cost a lot more, but, if you want something that will last a lot longer, look at a Milwaukee, DeWalt, Makita, Bosch, Hitachi for your replacement. Milwaukee actually guarantees their LiIon batteries will last 1,000 charges or longer.
I fix cordless DeWalt drills every week!Look for two black carbon-like blocks found on either side of the commutator ( the central spindle ) they will each have one wire on the outside end attached to a spade connector so the brush can be easily removed by prying it out from beneath the spring holding the brush against the commutator. Then the wire can be removed and the new brush installed.
Go online to http://www.toolpartsdirect.com and search for your model dewalt drill. they have an exploded diagram and parts listing for each model drill. That will identify the brush for you if you have never seen one before.
If the drill was operating intermittently with lots of noise and usually blue sparks coming out, loss of power, increasing intermittant operation it would almost certainly benefit from replacing the brushes.
If it is simply dead, and was ever dropped. check the battery terminals and the trigger mechanism. Of course inspect the battery and check inside the drill for loose or broken wires and connections. I hope this is helpful. Good luck!