tool repair

[i=p/u]

hey, hi, yo...

i have a hitachi H45MR hammer drill, and when i pull trigger the fuse pops so obviously shorting out... any fault finding techniques guys, ?

the person that gave to me said needs new carbon brushes, but hes a plumber..

is there any good repair shops i could consider sending this too which you have expierience with..

it looks good heavy drill for chasing and yes it was for free but dont know if free has any clout yet..


cheers

 

[telectrix]

reckon the armature/field coils is burnt out/short circuit. look at the commutator ( where the carbon brushes contact ). if the copper segments look burnt, it's a new armature.

 

[i=p/u]

kk cheers... probably too much for me, hope it doesnt cost much to repair and hope there is somone in northern ireland tht can repair or england if needs be...

 

[D80]

My first port of call would always be to check the lead. It takes a lot of abuse at both ends, would be well worth either reterminating both ends and shortening the flex by a good 6" or just renewing it altogether.

 

[MarkieSparkie]

For the list of Hitachi approved service agents in NI see the link below mate:

Hitachi Power Tools (UK) Ltd - Service Agent Locator

 

[ipf]

kk cheers... probably too much for me, hope it doesnt cost much to repair and hope there is somone in northern ireland tht can repair or england if needs be...

Take it apart and have a look. You don't learn without looking.

 

[D80]

Generally helps if you know what you are looking for though. Otherwise is a load of grease and parts just staring at you.

i=p/u you could ask any of the sparks you are working with if they know anything about it, and progress from there.

 

[Knobhead]

i=p/u, sorry but you’re a tradesman?
Haven’t you looked at it first before asking here?

Once you’ve cleared the muck out so you can see what’s what.

Check the cable as has been said.
The switch.
Comm’s often look burnt, but bright flash marks may indicate shorted armature windings. Check the brushes are OK for length and are free in the holders, a visual check of the armature and field windings usually give the game away as far as overheating is concerned. CR and IR tests will confirm.

Come on it’s basic stuff.

 

[ipf]

It's only a drill, for free. Pretty basic. Use your electrical head and check for signs of damage and signs of burning, bad connections, com, brushes, etc. Get some newspaper on a bench and lay things out as you take it apart.

 

[ipf]

Beat me to it Tony.

 

[D80]

As far as I am aware i=p/u is an apprentice. The best ears to bend then would be the sparks he is working with, would be ideal if one of them would lend a hand in looking at the drill.

 

[Knobhead]

Good point

 

[Guitarist]

Also Tony, what some of us might consider "basic" is quite complicated to those electricians who have only been involved in limited aspects of domestic installation. I know that many electricians have a technical, enquiring mind and are very knowledgable. Some however, can rewire a house and have it tested in double-quick time but have no technical knowledge beyond that.
Not a criticism of anyone, just how the profession is.

 

[i=p/u]

ok, fair points , when i pull the trigger the short is happening where the the windings are situated but i think everything else is in this compartment aswell, the copper doesnt look the shiniest , there is also a cage that turns which i think is the the rotor or stator or comutator hahah when i go home i will get the tester out and do IR test which is just going to tell me theres a short, its expieriece that will get me throught this, and make this free item a catch but i will try and ask questions from fellow workers and maybe find a diagram and try work it out.. i back at tech on thursday which my tutor is very knowledgable.. i know its a pie in the sky question asking on internet without somone looking... cheers

 

[i=p/u]

whats CR test tony and yes a big flash where windings are when push trigger. so id suggest armeture winding dont know why but just think this....

i=p/u, sorry but you’re a tradesman?
Haven’t you looked at it first before asking here?

Once you’ve cleared the muck out so you can see what’s what.

Check the cable as has been said.
The switch.
Comm’s often look burnt, but bright flash marks may indicate shorted armature windings. Check the brushes are OK for length and are free in the holders, a visual check of the armature and field windings usually give the game away as far as overheating is concerned. CR and IR tests will confirm.

Come on it’s basic stuff.