DeWalt Drill Trigger Fwd/Rev Switch failing

[Mike S]

My Dewalt Drill trigger is failing, sometimes I have to hold it on for
30 seconds or more while I disconnect and reconnect the battery, move
the fwd/rev swtich around, spin the drill chuck, hit the drill with my
palm shake it... it comes on when it feels like it. I haven't correlated
it to moon phases, yet. I found a part on ebay for $63 so I think I'll
try fixing it first, otherwise it's a new drill purchase instead
extending the life of this old beast.

This is the assembly
https://i.imgur.com/LKoThQf.jpg

It looks similar to this
https://www.amazon.com/Black-Decker-152274-19SV-Switch-V-S-R/dp/B00BFDL6DQ/ref=sr_1_6

Has anyone taken one of these apart? Does anyone have any idea how these
are constructed? it looks like a sizeable heat sink so I'm guessing it's
a wire-wound pot.

TIA,
Mike

[Phil Allison]

Mike S wrote:

-------------

** Not at all likely, almost certain to be a Mosfet drive using PWM.

Does it not make a whistling sound when you pull the trigger in slightly?


.... Phil

[Jeff Liebermann]

On Mon, 2 Nov 2020 19:46:33 -0800, Mike S <ms...@yahoo.com> wrote:

>My Dewalt Drill trigger is failing...

Does the drill have a model number?
Is there a number on the switch assembly?
<https://www.ereplacementparts.com/dewalt-cordless-drill-parts-c-1009_1162.html>


--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

[T i m]

On Mon, 2 Nov 2020 19:46:33 -0800, Mike S <ms...@yahoo.com> wrote:

>My Dewalt Drill trigger is failing, sometimes I have to hold it on for
>30 seconds or more while I disconnect and reconnect the battery, move
>the fwd/rev swtich around, spin the drill chuck, hit the drill with my
>palm shake it... it comes on when it feels like it. I haven't correlated
>it to moon phases, yet.

;-)

Could it be the brushes if there is no direct correlation to doing /
moving anything?

Cheers, T i m

[amdx]

I've had a few battery powered Dewalt drills. I won't get a Dewalt drill
again. I 'm disappointed in the battery lifetime*, I've had chuck
problems, also the clips that hold the battery in fail and the battery
must be pushed back in. I'm not sure what I will get, but I know what I
won't get.

 *life of battery not discharge time.


--
This email has been checked for viruses by Avast antivirus software.
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[RD]

In article <rnqjqr$fm9$1...@dont-email.me>, ms...@yahoo.com says...

>
> My Dewalt Drill trigger is failing, sometimes I have to hold it on for
> 30 seconds or more while I disconnect and reconnect the battery, move

We had a couple Dewalts at work with the same issue; after
a bit of searching online, the fix was dirt buildup had
dislodged a retaining clip on the fwd/rev selector.

Can't remember the site (sorry), but it should be
searchable. Disassemble the f/r assembly, clean and
reassemble.

HTH

[Fox's Mercantile]

On 11/3/20 6:35 AM, amdx wrote:
> I'm not sure what I will get, but I know what I won't get.

Makita.

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

[Edward H.]

On Tuesday, November 3, 2020 at 9:28:46 AM UTC-6, Riverman Jeff croaked:
> Makita.

You're awake! I was worried you had passed away. :(

[Fox's Mercantile]

No such luck Charger Boy.

[Edward H.]

On Tuesday, November 3, 2020 at 12:03:39 PM UTC-6, Lethargic Jeff sadly remarked:

> No such luck Charger Boy.

Where is your army of supporters? The ones all writing the same verbiage over and over? Usenet script run dry?

[Jeff Liebermann]

On Tue, 3 Nov 2020 06:35:25 -0600, amdx <am...@knology.net> wrote:

>I've had a few battery powered Dewalt drills.

All my power drills and drivers are DeWalt:
DCD777 20v drill
DCF787 20v impact driver
DCD710 12V drill
DCD710 12V drill in bad shape
DCF886 20v driver (blown speed control)
There are also several drills and drivers that I bought for parts. In
general, I'm happy with DeWalt drills and drivers. However, there are
some models that have specific problems and should be avoided. I
don't have a list handy.

>I won't get a Dewalt drill
>again. I 'm disappointed in the battery lifetime*,

>  *life of battery not discharge time.

The small DCB120 12v 1.3A-hr and DCB207 20v 1.3A-hr packs are not very
good compared to the larger battery packs. The basic problem is that
the BMS (battery management system) and charge balancer is in the
charter. That means that the BMS battery connections go to each cell.
If there is any resistance, or connection problem, between the charger
and the battery pack, the BMS won't equalize the charge between cells.
One or more cells will die from overcharge, while the remaining cells
will survive. The few that I've rebuilt, invariably have one or two
cells out of 3 (12v) or 4 (20v) cells blown. I've tested the cells in
the bad pack and confirmed that the remaining cells are almost as good
as new. Cleaning the contacts seems to reduce the problem. I had to
build a minimally abrasive tool to clean the battery contacts.

I haven't done any further investigation due to lack of time (and lack
of a clean workbench). The following is speculation. My guess(tm) is
that the charger is setup to charge the battery pack to 100% as fast
as safely possible. Workers in the trades don't want to be juggling
tiny battery packs to make it through the day. If they have to
charge, they want instant results. Slow charging doesn't sell well.
The advertised charge time is 90 minutes for both 12v and 20v packs
which is a charge rate of approximately:
90min / 60min/hr = 1.5C
That's higher than the maximum recommended 1C (1.3amp in 1 hr) charge
rate. That's what is probably killing the cells. Since I have more
chargers than I need, I was going to butcher one to operate at a
greatly reduced charge rate. I was also going to modify my Sky B6
imax balanced charger, which I use for charging drone battery packs,
to charge the DeWalt battery packs. The plan is to reduce the charge
rate and to stop charging at 4.1V (about 91%) instead of the usual
4.2V (100%).

How to replace the cells in a 12V Max lithium ion battery pack
<https://www.youtube.com/watch?v=CZVr2B4GMvM>

>I've had chuck problems,

Not me, unless you include gluing the chuck in place with a mixture of
sap, drywall, sawdust, dirt, and sand. A solvent bath, followed by a
chuck teardown, fixed the chuck.

>also the clips that hold the battery in fail and the battery
>must be pushed back in.

I broke the tongue off one large 20v battery pack by dropping it. I
glued it back together and lived happily ever after.

Talk to your friendly local 3D printing shop:
<https://www.thingiverse.com/tag:dewalt_battery>

>I'm not sure what I will get, but I know what I
>won't get.

Lots of reviews on YouTube:
<https://www.youtube.com/results?search_query=cordless+drill>

Makita might be slightly better but I like the banana slug yellow
DeWalt color.

[Mike S]

No sound at all Phil.

[Mike S]

On 11/2/2020 9:31 PM, Phil Allison wrote:

Good call...
https://i.imgur.com/5EBy4OQ.jpg

[Mike S]

On 11/2/2020 10:14 PM, Jeff Liebermann wrote:
> On Mon, 2 Nov 2020 19:46:33 -0800, Mike S <ms...@yahoo.com> wrote:
>
>> My Dewalt Drill trigger is failing...
>
> Does the drill have a model number?
> Is there a number on the switch assembly?
> <https://www.ereplacementparts.com/dewalt-cordless-drill-parts-c-1009_1162.html>
>
>

Great parts resource, I'll look for that. Thanks.

[Mike S]

I had great battery voltage and the battery ran the motor directly with
great power, no matter what I did with the trigger and fwd/rev switch no
V came out of the trigger assembly. Sorry I didn't mention that earlier.

[Mike S]

I did have to bend the clips that hold the battery terminal on one
terminal, which probably weakens them, so yeah that's an issue in general.

[Mike S]

Thanks, I'll give that a go.

[Mike S]

On 11/3/2020 7:28 AM, Fox's Mercantile wrote:
> On 11/3/20 6:35 AM, amdx wrote:
>> I'm not sure what I will get, but I know what I won't get.
>
> Makita.
>

LOL that's what my neighbor said.

[Jeff Liebermann]

They're just one of many DeWalt parts dealers online.
<https://www.google.com/search?q=dewalt+drill+parts>
However, the parts are rather expensive so I prefer to buy broken
power tools on eBay and cannibalized them for the parts I need. That's
one reason why I have so many DeWalt drills and impact drivers. I buy
one for parts, which can be used to fix several others.
<https://www.ebay.com/sch/i.html?_nkw=DeWalt+drill+for+parts>