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  1. #1
    Epic Contributor Soundguy's Avatar
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    Default industrial garage door drive chain help needed

    i'm repairing the middle bay roll up door at our shop.

    has a pull chain that loops tot he bottom for the operator to pull on. has a large and small sprocket at the top.. the drive chain ( bike chain style etc)that runs the large and small sprocket is a hair bigger than 40, but smaller than 50.

    any ideas.. i've never messed with garage doors like this.

    any clue?

  2. #2
    Elite Member Zebrafive's Avatar
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    John Deere 2030, John Deere 6415

    Default Re: industrial garage door drive chain help needed

    Are you trying to ID the chain size?
    Measure the distance between the side plates.
    Roller diameter
    Pitch (center to center of the roller pins)
    Pin diameter (may not not need this, should be able to determine from above three dimensions)

    WILD GUESS #428
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  3. #3
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: industrial garage door drive chain help needed

    That's my problem.. the chain is gone.

    our ex mechanic took the chain off the garage bay. it was our only roll up bay on that building.. the other bays are an open drive in and an open pull thru.

    he pulled the chain and we can't find it now, and the mechanic is long gone.

  4. #4
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: industrial garage door drive chain help needed

    i just went up and go the small sprocket down.

    I'm going to use my micrometer and caliper and do a good guestimate at reverse engineering those chain specs.

    I have a list / chart for the pitch/diameter and plat spacings.. so will see what I can come up with.

    thanks

  5. #5
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    Default Re: industrial garage door drive chain help needed

    My guess would be # 41 chain, that is a typical garage door chain, if not 48.
    Frank

  6. #6
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: industrial garage door drive chain help needed

    as soon as I can get some more measurements, I'll get it figured out

  7. #7
    Gold Member unbidden's Avatar
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    Default Re: industrial garage door drive chain help needed

    Soundguy, is there any reference number on the sproket?


    Foster Center, RI

  8. #8
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: industrial garage door drive chain help needed

    just went and cleaned the grime off the sprocket.. no numbers unfortunately.

    I'll bring my calipers to work tomorrow and using the skrocket profiles as a guess will see what chain onthe chart may fit.

  9. #9
    Elite Member Zebrafive's Avatar
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    Default Re: industrial garage door drive chain help needed

    Do you have other similar doors you can check that have the chain still intact?
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  10. #10
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: industrial garage door drive chain help needed

    i'm going to see if the door on the backside is this older style or not.

    we had one door back there that was repaired and converted to a different drive.. it used 41 chain.. and that was too small .. we tried a scrap piece on this sprocket. pitch too short anyway..

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