Bosch/Siemens brushes nightmare

[Micky 32]

Spent a lot of time today trying to get a set of brushes to work properly in a 5 year old Siemens washing machine, same motor as the Bosch maxx etc. I’ve never had this problem before.

The pump was gone so when i replaced it i decided to check the brushes. They weren’t gone but had worn down a bit so i decided to put a new set in. Why do some brushes never sit probably against the armature? It started off with the usual whizzing sound you might get with new brushes but this machine would not spin. It would start to spin and then cut out and end and display would go back to 0 due to a little arcing on the armature. I even tried to file a bit more of a curve but all it did was make it spin a little longer and then cut out. Put the old brushes back and all is fine.

Anyone else have this crap? They weren’t OEM brushes not sure who makes them as they were in a clear bag with the supplier i get parts from labled on it, sometimes they send me qualtext ones.

Is it best to use OEM ones?

[Penguin45]

Re: Bosch/Siemens brushes nightmare

I am currently finding that about 1 in 5 Bosch motors will not accept new brushes. They either arc up straight away on spin, or pick up speed and the pcb drops from 9 minutes to 1. Of those that survive the initial change, about 1 in 4 fail within 6 months – usually lifted segments. Not good.

Chris.

[eastlmark]

Re: Bosch/Siemens brushes nightmare

Strange, I do plenty of these a week and never had a problem…..always use genuine though……obviously worth it.

[admin]

Re: Bosch/Siemens brushes nightmare

ive done loads as well never had this happen …..again i will only use the genuine ….if thay are a bit sharp i will bed them in with a com stick…..

canufixit

[Martin]

Re: Bosch/Siemens brushes nightmare

Many are tempted to fit pattern brushes in preference to the genuine thing. It makes good financial sense and often as not they work just fine most of the time. 🙁

There are exceptions and in my experience I would avoid fitting pattern brushes to Bosch/Siemens and Candy/Hoover motors. Much has been aired about Bosch motors in the past and I guarantee when trouble comes with motors arcing and spin countdowns going from 8 mins to off it’s because you’ve fitted a pattern brush.

Bad arcing equals excess heat, excess heat causes commutator segments to fall off. Sadly Einstein is no longer with us but I’m sure if he was his formulae equation for the problem would look something like this : –

BSH (minus 00.154740 x .5 HP ÷ 1200rpm³) + 10°arc = BER 🙁

Or to put it another way using a much used UKW phrase…”Go figure!”. 😀

[Micky 32]

Yeah do a lot of these and to be fair this is only the second time this has happened and both on the same model machine with a countdown timer. I guess Bosch is the best place for the genuine ones?

[Madmac]

Re: Bosch/Siemens brushes nightmare

Do you always bed the new brushes in with a decent ceramic com stick Micky? Good idea on any motor but these fellas do seem to be particularly sensitive.

TBH i have had no probs with non gen brushes in the short term, but i have had a couple of motors throwing a hissy ( & armature segments!) after a few months have past, not the strongest motors though IMO. :rolls:

[PINKY]

Re: Bosch/Siemens brushes nightmare

It’s worth pointing out some models will time out on the spin if there’s no load in the drum 😉

[Author]

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