Katsu trimmer router will not start until I give it a spin

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Mel769

Established Member
Joined
13 Aug 2015
Messages
59
Reaction score
13
Location
London
Good evening hope someone can help; I bought a Katsu trimmer router back in April, so almost 6 months ago. Ive put it to good use in that time but yesterday it just stopped half way through a piece. Ive checked the brushes and there's plenty left on both & they dont look damaged atall. Ive stripped it down and checked for any obstructions ect and all looks good. With the power off it spins freely and is not impeded. With the power on I checked the voltage with a volt stick (in the body with the top off) and theres constant power there while wiggling the lead, so this rules out a dodgy lead.

Anyhow what ive discovered tonight after another look is that if I switch the power on and give it a slight spin manually (with the bit removed obviously) then that will get it going and all okay. However I do notice if i look through the vents that there's now quite (how can I put it) fierce sparking going on; more sparking than there was new when it was new im sure !

Would anyone have any ideas what could be wrong with it ? Im thinking it could be a dodgy speed control switch ?
 

southendwoodworker

Established Member
Joined
6 Nov 2020
Messages
140
Reaction score
117
Location
southend
I'd say is a warranty issue.

My limited electrical knowledge is that some motors need a capacitor to give it a kick like you've described to start it rotating. The starter capacitor could have blown. I don't know much about this though.
 

Mel769

Established Member
Joined
13 Aug 2015
Messages
59
Reaction score
13
Location
London
I'd say is a warranty issue.

My limited electrical knowledge is that some motors need a capacitor to give it a kick like you've described to start it rotating. The starter capacitor could have blown. I don't know much about this though.
Okay thanks I will look into that, I cannot see a capacitor (or any electronics for that matter) other than the speed controller. The warranty is expired after 6 months I expect. I would like to repair it anyway !!
 

Essex Barn Workshop

Established Member
UKW Supporter
Joined
11 Jul 2020
Messages
284
Reaction score
323
Location
Loughton, Essex
Good news is I can do a guaranteed fix for under £30!

 

D_W

Established Member
Joined
24 Aug 2015
Messages
9,767
Reaction score
2,041
Location
PA, US
Those are right on the bubble of "deal" compared to makita in the US. The makita trimmers show up new for about 60 pounds equivalent from time to time, but they do actually have the power they say they do (about 800 watts -even though it's not that easy to use all of it in a trim router).

I'd buy another one and use the time spent to make things instead of sorting out tools that may or may not be worth the time.
 

Mel769

Established Member
Joined
13 Aug 2015
Messages
59
Reaction score
13
Location
London
Thanks for the response its interesting. Thing is I would like to give it a shot at repairing it tbh before buying a replacement. The rotor does turn as I said; it just needs a tap to get it going; with that in mind I'm trying to reduce what's wrong with it ! Do these little trimmers even have capacitors? I will clean the commutator with cleaner, a toothbrush, and 400 grit w&d and see if that makes any difference. If not then try and get hold of a new speed controller and refit that. See I'm interested in what's wrong with it and trying to fix it before chucking in da bin. Thanks anyhow !!
 

MARK.B.

Established Member
Joined
4 Jul 2012
Messages
1,931
Reaction score
817
Location
East Yorkshire
6 months old, should still be in warranty, give the people you bought it from a call or email , worth a shot and you have nothing to lose.
 

Chrispy

Established Member
Joined
10 Aug 2011
Messages
1,888
Reaction score
94
Location
Oxfordshire
I'm sure you will find that one of the rotor windings has burnt out, if you have a meter you can check readings across the armature contacts. But they are not easy to dismantle.
BTW one of mine does the same.
 

Mel769

Established Member
Joined
13 Aug 2015
Messages
59
Reaction score
13
Location
London
I'm sure you will find that one of the rotor windings has burnt out, if you have a meter you can check readings across the armature contacts. But they are not easy to dismantle.
BTW one of mine does the same.

Thanks for the info, I will buy another.
 
Top