I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

On Thursday, 19 January 2017 14:17:28 UTC, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

If the vee belt is sufficiently worn, it can bottom out on the pulley(s) so no amount of tightening will fix it,
(It drives on the sides of the belt not the bottom.)

Check the pulleys to see if the bottom of the groove is shiny.
If so, new belt needed.

If it's a multi-vee, you should just change it, it will be knackered by now anyway.

On Thursday, 19 January 2017 14:17:28 UTC, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

Re cost of belt.
Take it to a general engineering supplier they may have a replacement at a fraction of the cost.

Just Google "vee belt suppliers".

On Thursday, 19 January 2017 14:17:28 UTC, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

IIRC it can result from belt overtension or belt/pulleys that need a clean. Or various other things. I can't see it being the PCB.


NT

On Thursday, 19 January 2017 14:17:28 UTC, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

As harry pretty much said a car belt should do the job at a fraction the price.


NT

On 19/01/2017 14:17, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe


Everyone is saying belt, but you said "hiss", is this like a SMPSU
"hiss"? I don't know how the motor is driven in your model but if it is
driven electronically then fitting new brushes may have altered
something. Would tie in with "under load" as well.
No harm in checking over the motor drive connections on the PCB with
some decent light and a loupe (visually inspecting any caps present
wouldn't go amiss either) but if it is the new brushes it may well
settle down on it's own.

On 1/19/2017 2:17 PM, Joe90 wrote:
I've got a Miele washing machine - had it for years, probably done over 10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I completely pulled it to bits and replaced the drum bearings, motor brushes and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as it agitates. Does not depend on the direction of rotation - seems to depend on torque during acceleration or with washing flopping about in the drum. I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new drum bearings are silky-smooth. The motor spins very freely on the bench - no noise or slackness in its bearings at all. It doesn't sound like brushes - for one thing, they have inclined faces so I would expect a different noise in each direction. It is higher frequency than I would expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when producing torque? At about £50 for a Miele belt and £400 for a motor I cannot afford to "try it and see".


Thanks
Joe

I agree with what others said about belts, but I seem to recall a
machine I had in the distant past which generated a periodic squeak from
the drum suspension. IIRC it was suspended on springs, but there was a
steel plate attached to the drum which was clamped between a couple of
plastic pads attached to the casing to provide damping.

On 19/01/2017 17:55, newshound wrote:

I agree with what others said about belts, but I seem to recall a
machine I had in the distant past which generated a periodic squeak from
the drum suspension. IIRC it was suspended on springs, but there was a
steel plate attached to the drum which was clamped between a couple of
plastic pads attached to the casing to provide damping.

The LG we had did that, but it was an even more annoying lower pitched
kind of vibrating squeal. Replaced the machine (for other faults)
before figuring out how to fix it

Does it get affected by the load of the washing inside?
If not then I'd say its not related to side forces. if its cyclical watt
the rotation then maybe the gator that stops it leaking is moving jerkily
against some moving part. Other than that if its random it could be almost
anything as you say, pumps, hoses rubbing against things etc.
Not having that model I cannot say, but maybe you can use some form of
directional microphone device to try to pinpoint the culprit.
Brian

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"Joe90" wrote in message
...
I've got a Miele washing machine - had it for years, probably done over
10,000 hours washing.

It was starting to get noisy and had the odd squeak so last weekend I
completely pulled it to bits and replaced the drum bearings, motor brushes
and door seal (with genuine Miele parts).

Now when it runs there is an intermittent really high-pitched hiss/squeak as
it agitates. Does not depend on the direction of rotation - seems to depend
on torque during acceleration or with washing flopping about in the drum.
I've tried tightening the belt but that hasn't helped.

The sound is so high that I cannot tell where it is coming from. The new
drum bearings are silky-smooth. The motor spins very freely on the bench -
no noise or slackness in its bearings at all. It doesn't sound like
brushes - for one thing, they have inclined faces so I would expect a
different noise in each direction. It is higher frequency than I would
expect from a belt - not really a squeal.
Could it be the PCB? Or the motor bearings under higher side load when
producing torque? At about £50 for a Miele belt and £400 for a motor I
cannot afford to "try it and see".


Thanks
Joe

Thanks everyone. The idea of the belt hitting the bottom of its grooves seems most probable - I'll try a new one.

Joe