CLA Connect Open Forum

sc50 pulley keeps flying off machine

  • 1.  sc50 pulley keeps flying off machine

    Posted 13 days ago
    Not just the belt, the entire pulley (very heavy) comes off and drops to the floor.

    First time it happened I thought the screw that holds it on had just come loose.  Put it back on very tight.

    Two weeks later it flew off again.  Maybe screw is no good?  It was old and a little rusted.  So buy a new screw (F430100) and put it back on a second time.  Note:  When I screw it on I am able to get it very tight (the screw is grabbing and holding).

    A month goes by and it has now come off again.  I am stumped.

    The extension spring is fine.  Key is fine.  The motor is fine.  The belts are new.  The machine works great all the way up until pulley comes off.

    SC50EC2AU

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    R Anderson
    Store Owner/ Employee
    Camarillo CA
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  • 2.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    Loctite on bolt and shaft.

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    Curt Harrington

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  • 3.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    Did you check the alignment of the 2 pulleys?

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    K J
    Store Owner/ Employee
    Binghamton
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  • 4.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    If your washer is 3 phases , change the spin dicrection to counter clockwise " facing the washer" that's way it help tighten srew by itself.

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    Linh Nguyen
    Store Owner/ Employee
    Mobile AL
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  • 5.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    ​You might think its Tight? Check the speck & use Torque Wrench with Loctite.

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    Mike B
    Multi Store Owner
    Sunny Palm Harbor Florida
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  • 6.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    Edited by Paulie B 13 days ago
    I agree with Curt & Michael B....

    Loctite not just the screw threads, but the whole fitting. Especially since it already loosened up and came off.
    Each time the pulley comes off the shaft, the whole thing gets a little looser.

    If you didn't have to change the bearings some day, I would use PC-7 or JB Weld.


    I've never done this, but I do have a little theory how you can make an epoxy bond removable though.....

    Before you apply the epoxy, you spray all surfaces with WD-40, and then lightly wipe them to give the surfaces a thin coat of oil. Apply epoxy & let it cure for at least 48 hours. The epoxy should fill any loose micrometer gaps in the joint, yet not adhere to the surfaces, allowing future removal.

    In essense, you are rebuilding the shaft, keyway, key, and pulley hole. Has anyone tried this? The only guys I can think of who would have already tried this would be Michael B, and David Chamlee, lol.

    I WAS very successful with using PC-7 on some old worn out Hoyt dryer shafts. It was amazing how well the PC-7 held the pulleys onto the shafts over many months of operation. The only reason I did that though, was because the dryers were so old and I couldn't get parts. I just wanted to keep them running until I could replace them a year later. The pulleys stayed on until I got rid of the dryers.
    I never tried to see if they could be removed with a good puller....maybe yes, maybe no.






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    Paulie B
    Multiple Mat Owner since 1976
    New York City, NY
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  • 7.  RE: sc50 pulley keeps flying off machine

    Posted 13 days ago
    ​Paulie, if I had a shaft that was that bad I would take it to a machinist (I miss the days when I was a Machinist & could fix anything with ease since I had access to almost every machine known to man) & have it repaired, if not to bad I have welded it myself then file it down to proper size. I think your idea would work, you could break the seal of the epoxy with a torch & or a good puller/press.

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    Mike B
    Multi Store Owner
    Sunny Palm Harbor Florida
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  • 8.  RE: sc50 pulley keeps flying off machine

    Posted 10 days ago
    I agree with the Locktite idea.
    In addition to that I would add a Grade 8 Bolt of the proper size, and increase the length to "just before bottoming out."
    Then I would add a Split Lock Washer to the bolt just under the head.
    The Spring pressure of the lock washer helps keep tension on the bolt threads, thus helping to avoid backing out from vibration.
    The knife-edge of the Lock Washer "digs in" to the head of the bolt, also preventing it from backing out.


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    DAVID CHAMLEE
    Service Technician since 1986
    and sometimes Laundromat Owner
    CCR
    Santa Barbara, CA
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  • 9.  RE: sc50 pulley keeps flying off machine

    Posted 12 days ago
    When pulley is on, did it slide on easy? Is it a tight fit? When on can you wiggle it before righting set screw? Could be your shaft or pulley is worn which means new motor or new pulley.

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    Harry Pruyn
    Solano Cleaning Center
    1219 Solano Ave.
    Albany, Ca
    510 524-0254
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  • 10.  RE: sc50 pulley keeps flying off machine

    Posted 12 days ago
    You can also change out the bolt in the pulley for the same size (knurled cup point set screw).
    Once these bite into a shaft it takes a lot move vibration for them to come loose.

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    K J
    Store Owner/ Employee
    Binghamton
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  • 11.  RE: sc50 pulley keeps flying off machine

    Posted 10 days ago
    Epoxy can be melted or maybe vaporized with a propane torch.  Golf club heads (steel) are held on with epoxy, and are frequently removed for replacement or repair.  Somewhere I remember reading that the longer it takes the epoxy to set, the stronger the bond. Some of the "quick set" epoxy preparations may not be as strong as the slowly curing ones.

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    Y Winston
    Store Owner/ Employee
    Chesapeake VA
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  • 12.  RE: sc50 pulley keeps flying off machine

    Posted 9 days ago
    The pulleys are aligned and the pulley fits tight (no play).  It is 3 phase.  I wish I had used the split lock washer, but the job was already done.

    I called Alliance tech support.  He told me there is no torque spec, that you just tighten it.  He also advised to use a longer bolt (with nuts, etc.) to get it fully seated, then use the correct bolt with loctite.  That is what I did.

    I also swapped the pulley with the sc50 next to it, and put loctite on both.  Hopefully this will help narrow it down if this happens again.  Both machines survived a busy weekend without issue.

    I must say it requires somewhat of an athletic pose to get the pulley on, squatting down (no room to kneel) and lifting it the exact height.

    Thank you for all the great advice.

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    R Anderson
    Store Owner/ Employee
    Camarillo CA
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  • 13.  RE: sc50 pulley keeps flying off machine

    Posted 8 days ago
    Next time you want to remove, or replace that Pulley use a Motorcycle Tie-down
    (Harbor Freight is 3 miles from you)

    Wrap the tie-down strap around the upper panel,
    Hook the pulley spoke,
    and tighten up until it's the right height.

    Use the Ratchet type and it's better.
    Pull up until close, then ratchet to perfect alignment.
    No "squats" or "lift and Jerk" (and, no comments about the "Jerk")


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    DAVID CHAMLEE
    Service Technician since 1986
    and sometimes Laundromat Owner
    CCR
    Santa Barbara, CA
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