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NinerBikes's avatar
NinerBikes
Explorer
Oct 31, 2014

That Dometic left arm replacement on my canopy/awning

I have a travel trailer where I barely clipped the rear, left arm assembly on my Dometic automatic awning.

I've ordered the replacement assembly for the 15 footer, and in pulling the old unit off, there was a prewound up spring that lost all of it's tension from when the awning was pretty much all the way closed up, perhaps only a foot from fully closed.

I assume I am either going to have to wind it back up and install it into the arm, which direction, clockwise, or counter clockwise, and how many turns, or, I have to install the bracket completely first, all screws, then with the left side not mounted, unfurl the whole doggone thing fully extended, and then slip the spring back in place.

Any one have any experience in the best way to R&R these items. It has a gas cartridge inside, and the Dometic part number is 3312487.022B ... Price: $289.98. It's the side without the electric motor.

3 Replies

  • Chris Bryant wrote:
    Here you go, that should give an idea. It is best to tension rolled up, with the arm zip tied against a block- just a little extended. It's 8 turns rolled up. You can tension, then put a cotter pin in to hold it.


    Thank you so much for that link!

    I don't know why Dometic doesn't include the instructions in the box with a new arm?


    Yikes, thats some serious preload, I need to get more on there, only got three. Is there some sort of spanner wrench to pretension?

    Edit: found the answer, need to get some special crank handle, and apply clockwise, 8 full turns, then pin it in place with a cotter pin. Where to rent or borrow that crank handle?

    Really wish that Dometic included instructions to pin the unit with a cotter pin before removal to R&R a bent unit, to prevent the loss of preload. Another WTF moment. Oh well, live and learn. Hard to RTFM when one was not included printed out in the box.
  • Here you go, that should give an idea. It is best to tension rolled up, with the arm zip tied against a block- just a little extended. It's 8 turns rolled up. You can tension, then put a cotter pin in to hold it.
  • Does anyone know how many rotations of preload should be used on this, before inserting the spring loaded roller into the arm?