Knocking on spin cycle, help please?

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  • #93641
    Mattypompy99
    Participant

    Hi guys,

    I have a Zanussi zwd1252w and it recently had a failed heating element that I’ve just replaced. Now that is working fine and not tripping the RCD but I have a new issue.

    On spin, over a certain rpm there is a regular rhythmic quite loud knock on every revolution. Ie the faster the spin the more frequent the knock.
    Any ideas? The sound seems to be emanating within the drum casing. What about the heating element bracket inside the drum? The sound wasn’t there before the element failed.

    Thanks awfully!
    M

    #455099
    electrofix
    Moderator

    Re: Knocking on spin cycle, help please?

    when you replaced the heater did you ensure the end went into the restraint.
    if it did not it can wobble and catch the drum

    Dave

    #455100
    Martin
    Participant

    Re: Knocking on spin cycle, help please?

    It could be the drum support spigot has broken? Easily spotted from the front as the drum rotates a little off centre as it rotates at low speed. Just remove the belt then spin drum by hand and see if it has a very slight elliptical orbit.

    #455101
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    electrofix wrote:when you replaced the heater did you ensure the end went into the restraint.
    if it did not it can wobble and catch the drum

    Dave

    Yes I saw that restraint. Maybe I didn’t locatte it correctly. Thanks. I’ll take the element out and have a look. I guess I just put it in and ensure it feels secure?
    Thank you

    #455102
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    Martin wrote:It could be the drum support spigot has broken? Easily spotted from the front as the drum rotates a little off centre as it rotates at low speed. Just remove the belt then spin drum by hand and see if it has a very slight elliptical orbit.

    Thanks Martin. I’ll check that out. I was reading about spider support arms too!

    Cheers bud

    #455103
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    Martin wrote:It could be the drum support spigot has broken? Easily spotted from the front as the drum rotates a little off centre as it rotates at low speed. Just remove the belt then spin drum by hand and see if it has a very slight elliptical orbit.

    Hi Martin,

    After flooding the kitchen floor again! (Did a drain cycle then removed element thinking it was empty!) I removed belt and spun drum.

    There is a slight bearing crunch noise but the drum spins freely with no resistance. There is a slight elliptical spin. I would estimate about 7mm in the vertical. Is that an issue?

    Also with the element removed I couldn’t replicate the knock spinning manually. I think it may be catching on the drum when on spin cycle. Also one of the springs is a bit squeaky but the dampers seem OK.

    I intend to do a dry spin cycle minus the element to check for the knock next.

    Any other suggestions? :snig:

    Thank you kindly for the input :tup:


    https://flic.kr/p/25Gq2yi

    Element bracket above.

    #455104
    Martin
    Participant

    Re: Knocking on spin cycle, help please?

    I couldn’t figure the photo of the bracket though the other photo collection was interesting 😉

    That elliptical movement you describe is what I was afraid of. It could well be that the drum spigot (one of the 3 arms) has fractured. 🙁

    #455105
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    It was awkward to he the right snap as I had to hold a lamp to shine in at the same time. Basically the weird shaped metal thing top rightish is the element support bracket in the element aperture.

    Looking at it on the pic it looks kind of bent actually? Might be catching on the drum. If its a spigot is it a right off do you think?

    What other photo collection?! 😮

    #455106
    electrofix
    Moderator

    Re: Knocking on spin cycle, help please?

    we seem to have more than one photo on that link including some that seem to be about parking violations around Portsmouth council

    as martin said you heater mounting photo of well out of focus and cant be seen properly

    also if your drum spider has failed this look like the correct one
    https://shop.ukwhitegoods.co.uk/5025301 … rum-spider

    but its a big strip down to fit it


    Dave

    #455107
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    Oic what you mean now! I didn’t think the other photos were viewable!

    Thought the parking fine ones were on a separate URL! Oh well could’ve been worse! 👿 😛 :rotfl: I got off one!

    I’ll try and get a better bracket pic. Its difficult though. I think I may have bent it inadvertently on element install. May just need a little tweaking hopefully.

    Thanks

    #455108
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    OK. I’ve had another look inside the tub through the element aperture and can’t see any obvious catching objects.

    The spin of the drum is smooth and silent. The terminal ends of the spider arms seem secure by feel.

    Here are a couple of flicks. Spielberg isn’t worried!

    I don’t mind doing stripping it to replace the spider, found one for £45, but am debating getting a borescope to look first instead of a strip. Thanks for link btw Dave.

    I’ll do a spin test minus element first.

    https://www.flickr.com/photos/71043822@ … res/t1623E
    Cheers

    😆

    #455109
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    Mattypompy99 wrote:OK. I’ve had another look inside the tub through the element aperture and can’t see any obvious catching objects.

    The spin of the drum is smooth and silent. The terminal ends of the spider arms seem secure by feel.

    Here are a couple of flicks. Spielberg isn’t worried!

    I don’t mind doing stripping it to replace the spider, found one for £45, but am debating getting a borescope to look first instead of a strip. Thanks for link btw Dave.

    I’ll do a spin test minus element first.

    https://www.flickr.com/photos/71043822@ … res/t1623E
    Cheers

    😆


    It won’t go into spin only cycle now. I do have the element removed and the water off though 😮

    #455110
    electrofix
    Moderator

    Re: Knocking on spin cycle, help please?

    video is a bit difficult to see. if your camera stayed in one place it would be easier to see

    look in the door of the machine and spin the drum there. look at the drum front lip and see how much run out there is. a small amount is ok but over about quarter inch and it could be a spider crack. if there is a crack in one let the drum will bend the remaining legs and start to hit things

    did you look at the heater for signs of metal to metal contact. more important did you check the old one

    Dave

    #455111
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    electrofix wrote:video is a bit difficult to see. if your camera stayed in one place it would be easier to see

    look in the door of the machine and spin the drum there. look at the drum front lip and see how much run out there is. a small amount is ok but over about quarter inch and it could be a spider crack. if there is a crack in one let the drum will bend the remaining legs and start to hit things

    did you look at the heater for signs of metal to metal contact. more important did you check the old one

    Dave

    Yes it was difficult to keep steady lying upside down on the floor with a light!!!


    I did look for metal to metal contact on the new heater, the knocking wasn’t present before, and couldn’t see any.

    There’s a few mills run out but not too extreme.

    Will try a wet cycle tomorrow.

    Thanks again Dave :tup:

    #455112
    Mattypompy99
    Participant

    Re: Knocking on spin cycle, help please?

    SOLVED!
    Working now! It was one of two things. Either, as Dave said, a poorly seated element on the restraint. Took it out and replaced carefully.

    Or I noticed a drying pipe loose from a drying fan. It could have knocked on the tub on spin. Think it was the first issue, so cheers Dave!

    Two weeks of washing to catch up on! :tup: :rotfl:

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