Generic Caterpillar Cruise Control O-ring

Discussion in 'GS Boxers' started by Poolside, Jun 27, 2005.

  1. Poolside

    Poolside Syndicated

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    <BR>The yellow-colored o-ring used by Caterpillar is a standard item. AS568 Standard No. -320.

    It's available from McMaster-Carr . . www.mcmaster.com

    -320 O-ring Part Numbers:
    Buna-N - durometer 70 - p/n 9452K207 - $5.92 pk/50
    Viton - durometer 75 - p/n 9464K155 - $8.40 pk/10
    Silicone - durometer 70 - p/n 9396K292 - $7.72 pk/10 - Red-Orange color
    EPDM (Ethylene Propylene) - durometer 70 - p/n 9557K297 - $11.13 pk/50
    Neoprene - durometer 70 - p/n 94115K320 - $13.94 pk/50
    Polyurethane - durometer 70 - p/n 9558K142 - $27.98 pk/5


    Maybe available at your local hardware store in Buna-N, but prolly listed fractionally instead of by the dash number:
    ID - 1 1/8"
    OD - 1 1/2"
    Width - 3/16"


    The Buna-N material is fine for the cruise control application. I use it.
    EPDM and Silicone are more weather resistant, but less tear resistant.


    ****************

    AS568 Standard No. -320
    Inside Diameter 1.100 / 27.94mm
    Cross Section .210 / 5.33mm


    Here is the data from the Caterpillar Seal Catalog:

    Size:
    DASH . . . 320
    Cross Section 5.330mm
    Inside Diameter 27.940mm

    Material:
    NBR NITRILE (Buna-N) . . . durometer 75 . . . 5H- 7370
    FLUORO CARBON (Viton) . . . durometer 75 . . . 3P- 0648
    SILICONE . . . durometer 70 . . . 8M-4991 (The yellow one used for the cruise control)


    Edit for clarity
    <BR>
    #1
  2. TonyA

    TonyA beta tester

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    Fixed it.

    You live in the land of lots of ozone. Buna is the cheapest which is good because it'll also age the quickest. Viton and silicone will go a little farther for you.

    Also pay attention to the material hardness - ask about the "durometer" number. 70 is standard for Viton and Buna. 90 is also on the shelves but it would be way too hard. 50 may be typical for silicone (which would be nice and squishy) and that might make it the best for this job. Worth trying.
    #2
  3. CMWoody

    CMWoody Banned

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    While not nearly as good as a dedicated cruise control lock, works ok

    [​IMG]
    #3
  4. rous44

    rous44 Long timer

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    I've never seen anyone use one of these. What do you do with the o-ring?
    I see you have two on your grip; is this because they are time consuming to install and you put two on in case one breaks?
    Please explain
    Thanks
    #4
  5. CMWoody

    CMWoody Banned

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    Those are the silicone ones, and yep, always good to have a backup there if I need it.

    What you do is jamb it between the grip and the end weight for cruise control action. Have to say though, if I wasn't selling this bike soon, I would have rather parted with the $100 and had a good metal threaded one like the ones Afetke sells.
    #5
  6. Techsender

    Techsender Adventurer

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    May 23, 2007
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    Minnesota
    Just picked up two generic speed control devices from my friendly Cat dealer. PN 8M4991 is now 3.90 each. And they knew exactly what application I was using it for.
    #6
  7. martoonisotu

    martoonisotu Please Stand By...

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    The guys at my CAT dealership in Denver (Aurora) got a kick out of me when I bought mine...nice guys.

    If you're on the interstate, you can simply roll it from brush guard part of the bar end weights to where they meet the throttle grip, and then roll it back off when you plan to exit, (think Nebraska). If you're turning the throttle a lot, plan on it getting wedged between the grip (throttle) and bar end weight, which is kinda a pain.

    They're worth the money, but not without their short-comings.
    #7