Question about Hitachi DS14DVF3 14.4 Volt Ni Cad 3/8 Inch Cordless Drill/Driver Kit

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Intermittently will not run when trigger pulled, juggling and turning shaft let it run. Is it brushes, commutator, or speed swithch. This is Hitachi DS14dvf, about 5 yrs old

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Probably switch--try spraying electronic contact cleaner into it with the small tube.

Posted on Mar 02, 2010


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Posted on Jan 02, 2017


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Hitachi 24v sds hammer drill issues with speed when pulling back trigger switch sometimes works other times nothing, already changed dc speed control trigger any ideas to what the problem is? Thanks

faltering on a slide contact on electric field or switch, but in most cases dirth (dust) in carbonbrushes can be hanging somewhat in one or both brushholders.
Or a problem in the trigger switch itself dust and dirth have almost the highest priority in case of faltering by clamping carbon brushes.

Oct 04, 2016 | Hitachi Drills

1 Answer

How do I get this tool apart to clean it.

Think you need to replace the motor brushes. As they wear they get shorter and the spring that pushes them up against the commutator is now at the end of its travel. Replace brushes or stretch the spring a tad.

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I have a Milwaukee Hammer drill #5370-1, serial #672D 5044 60047. The drill stopped working and I suspected worn brushes. Now that I have taken it apart and found the brushes were not worn (and I found...

The brushes are usually replaceable from outside the drill. Make sure each spring is properly tensioned. Make sure the electrical outlet is live by trying a working lamp or other item. Pull the trigger full on and wiggle the cord where it goes into the plug--if the tool turns on intermittently, suspect a bad cord connection at the plug. Just replace the plug after cutting the cord back an inch or so. You can test the speed control by a temporary jumper across the module which should allow the tool to run full speed. Make sure the reversing switch is ok. Hope this helps!

Jan 06, 2011 | Garden

1 Answer

Electric winow on passenger side works intermittently going up. there is12v at the motor when switch is pressed 'down'.

12 volt dc motors use brushes and commutators. One or both of your brushes may be making intermittent contact with the commutator bars, or your commutator bars may be bridged with carbon buildup from the brushes wearing down. To check brushes remove the slotted round caps and check them. Look inside the hole after you pull the brushes out. You will see parallel bars of copper. the spaces between all of them should be clear of carbon and debris. the coppers should be shiny.

Nov 23, 2010 | 1989 Peugeot 405

1 Answer

The saw do not stop when i off the trigger

the commutator might be dirty, try and turning the brushes 180 degrees and you might have to clean the commutator with a stone for that purpose to seat the brushes.

Jan 13, 2010 | Dewalt DW715 Heavy Duty 12" Single -...

1 Answer

I have a Hitachi C8FB2 compound miter saw that the electrical break has stopped working on. The bushings are still good but I see and hear a electrical arc were the bushings touch the shaft. What can I do...

there is always going to be some sparking between the BRUSHES and the commutator. if it is excessive and loud or is really heating up the housing, there could be a crack in one of the brushes, the brush might be chipped or unevenly worn, or the brush holder itself may be burned cracked, or otherwise need to be replaced. they may LOOK okay but need to be pulled out to really know for sure sometimes. there is a small set screw in the housing that holds the brushholder in place.

while this could be the problem with the electric brake, it is more likely that there is a wiring connection loose, broken or burned inside the motor housing. it could be the switch but i dont believe the brake circuit runs through the switch on this model.

Dec 13, 2009 | Hitachi C8FSHE 8-1/2-Inch Sliding Compound...

2 Answers

Hilti TE6A battery dril 36volts,trigger problems

what about the brushes. even if they arent worn completely down they sometimes will not have enough pressure on the commutator tabs to keep the tool running. if it works better upside down or sideways that is often an indication of faulty brushes. the springs that hold the brushes against the commutator may also be weakened to the point that they don't properly force contact. you may also have burned or blank spots on the commutator/armature.

try new brushes and make sure the associated wires arent broken, pinched or otherwise damaged. also clean the commutator with a polishing cloth or very very very fine sandpaper, being careful not to scratch, groove, or otherwise damage the tabs. also, the bearings that fit in the housing to stabilize the armature may be worn or seizing, which will cause the armature to move erratically and/or bind.

if all of these things have been done, and the problem STILL exists, then probably the motor itself (armature/field) is breaking down. the brushes and bearings at least are probably in stock at a local tool repair shop, and of course all parts can be purchased through hilti.

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1 Answer

Kirby G3 won't run

sounds like brushes not being pressed down to the commutator shaft. pull out brushes and clean the brass brush guides and then apply a light coat of grease to brushes. however, what exactly do you mean by "the fan is OK"?

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