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Hi folks,
Well after a fair bit of detective work by myself and by Jim (IADOM) I think we’ve cracked this and the motors burning out after the carbons are replaced. Generally the carbons seem to be wearing out where the machines are in a high use situation so it’s not a problem with the brushes or motor, it’s just use.
Anyway, on with the show…
The first image shows an ariel view of the Hoover carbons that a lot of us have been using and also the originals…
As you can see there is a HUGE difference in the angle of the brush where it contacts the commutator. What we think is happening (or has been) is that when you fit the Hoover brushes shown at the top, that this is giving less contact with the comm and causing it to overheat and burn out the comm.
So, replace the carbs and a few weeks later it needs a motor. 🙁
The next image is a side on view.
Again you can see the difference.
What you can sort of see is the massive difference in quality between them as well, the patterns Hoover carbons are very poor in comparison which I don’t suppose will help matters any.
Also, as Jim et all noted elsewhere, you can see that the holders ARE different. We think that the lip to the front on the original is making the brush more steady and allowing better contact. Where the pattern carbon is fitted using the Hoover holder it moves which just further exacerbates the overheating on the comm problem.
In short, please ONLY use the original carbons. Yes, they’re more expensive but it may well save replacing the motor a few weeks later due to the problems outlined above.
Now the bad news, the Hoover carbs are about £3 or £4 a set, the genuine ones are £4.65 excl each! However, that’s cheaper than a new motor and saves a recall later so, IMO, worth the extra few quid to do the job right in the first place.
Any carbons we send will now be the genuine ones, we will not be sending the pattern ones, even if we run out of stock of genuine.
Please do not fit the pattern ones.
K.
Re: Carbon Brushes
Had two motors in need of replacement this week. 😥
I will normally always try new brushes but in both of these cases the plastic sheathing from the armature had melted and was all over the floor under the machines.
In these cases I always replace the motor, just wondered if anyone had risked changing motor brushes on ones like these. ❓
Jim.
Why dont you lot fit carbon brushes designed for Selni motors instead of Hoover?.
Dont want to be an advert for masterpart but: BT12100 £6.99Re: Carbon Brushes
Selni motor is on the ISE2 and they’re not old enough yet.
Gen Hoover brushes 97916670 £3.45 from Masterpart.
Original post is instructing us to fit these rather than any pattern equivalent.
Chris.
Re: Carbon Brushes
Now issued with gen, gen brushes, not even Hoover gen although they seem to have been OK up to now especially if transferred to the original holders. 😉
The Masterpart brushes were the ones that caused all the problems for me on the CI555W motors.
My question was specific to motors that have cooked the armature a little, I have seen lots of these motors were the plastic sheathing has burnt off the armature. I have not risked brushes on any of these. I just asked if anyone else had. :rolls:
Jim.
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