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Dewalt DCD939 Hammer Drill


giavra

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Hi to all member.I'll ask for your help about my drill.Recently I open and dismantle my DCD939 for inner cleaning purpose but after that and after closing the tool again and screwing all the screws the torch scale in the front from 1-21 torque scale is not work well,and I mean when I put the ring to the 1(first) scale the clutch is not work the chuck don't stop so the clutch make his work but keep running and this happen to all stage from 1 to 21 of torque scale.I reopen and close the tool several time i think I put everything in place because the the scale of normal drilling is working well as the hammer too,but now I can't use it as screwdriver and i don't know what is wrong.Unfortunately here in my town don't exist any Dewalt service station and so I don't know what to do?

All suggest is welcome.

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i'm am not an expert so take this with a grain of salt. all my drills that i have taken apart out curiosity or to fix, all of them seem to work on the same principle regarding the torque ring. the way i can only explain it is that the ring is like a screw that pushes a spring. ...

part #28 from this link...

http://www.ereplacementparts.com/dewalt-dcd939-type-144v-hmrdrdrilldrivedriver-parts-c-1009_9661_25052.html

at 1st setting, the ring is pushing on the spring very little...at the highest setting the spring is fully compressed.

now what causes the slip of the chuck is either some bearings or just washer bushings...think putting ur hands together and rubbing them...the harder you press ur hand together, the harder it is to rub them together (friction)...

having said that...that is where i would put my money...maybe u dropped a bearing or just put it back wrong where the outer ring sleeve (the one with the numbers) is not compressing the spring.

this drill is taken out of commission so i have it for parts...in this drill it usses a series of spring that push on bearings..(bearings ride on a metal ring that has groves)

at pic 1 it is set at one and at pic 2 it is set at highest...where is locks the chuck to the transmission.

vG6zQgg.png?1

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i'm am not an expert so take this with a grain of salt. all my drills that i have taken apart out curiosity or to fix, all of them seem to work on the same principle regarding the torque ring. the way i can only explain it is that the ring is like a screw that pushes a spring. ...

part #28 from this link...

http://www.ereplacementparts.com/dewalt-dcd939-type-144v-hmrdrdrilldrivedriver-parts-c-1009_9661_25052.html

at 1st setting, the ring is pushing on the spring very little...at the highest setting the spring is fully compressed.

now what causes the slip of the chuck is either some bearings or just washer bushings...think putting ur hands together and rubbing them...the harder you press ur hand together, the harder it is to rub them together (friction)...

having said that...that is where i would put my money...maybe u dropped a bearing or just put it back wrong where the outer ring sleeve (the one with the numbers) is not compressing the spring.

this drill is taken out of commission so i have it for parts...in this drill it usses a series of spring that push on bearings..(bearings ride on a metal ring that has groves)

at pic 1 it is set at one and at pic 2 it is set at highest...where is locks the chuck to the transmission.

vG6zQgg.png?1

Thank You Joe for your reply yes the basic principle of the torque ring is as you subscribe it,but this ring in my tool push correct the spring the issue may in the spindle that came out from the transmission gear. Look close the photo here

http://www.google.gr/imgres?um=1&hl=el&client=firefox-a&hs=xvo&sa=N&tbo=d&rls=org.mozilla:el:official&biw=1280&bih=624&tbm=isch&tbnid=_YECDyh5OETusM:&imgrefurl=http://www.ebay.ie/itm/Dewalt-Transmission-397892-05SV-gear-box-dc988-dw988-dw987-dc983-dc989-dw989-/180932982088&docid=L_A_2ochrc07xM&itg=1&imgurl=http://i.ebayimg.com/00/s/OTAwWDE2MDA%253D/%2524%28KGrHqR,!jgE%252BSePTeP%28BQCIc3WJ1w~~60_3.JPG&w=800&h=450&ei=YaEHUay1IaKk4gSXu4CoDw&zoom=1&ved=1t:3588,r:44,s:0,i:220&iact=rc&dur=441&sig=107120819382660460149&page=2&tbnh=168&tbnw=300&start=24&ndsp=29&tx=119&ty=85

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