If your rv slide out awning is equipped with an air bladder use the internal air pump and flip the switch to on to inflate and add tension to the fabric.
Slide out awning tension adjustment.
Reattach the rear awning leg and lower both leg sections completely.
Roll the awning back up to observe how tight it is.
Since you do not tell me who manufactured your slideout topper awnings it will be very hard for me to tell you how to adjust the tension on them.
If you are satisfied move on.
The following link will take you to a document that describes the proper and safe procedure for adjusting the slidetopper tension and replacing fabric.
The spring tension on the slide topper can be adjusted but you must do it carefully because there is considerable energy in the stored spring if it were to get away from you.
The cotter pins are the ones that lock the spring tension securely while taking down the rv awning.
Step up to the awning and clear out any leaves or twigs from the awning seam.
There is a fine line on slide awning tension for correct extension of room and correct tension on the cover.
How to adjust the tension on an rv slide out awning step 1.
When you release the tension in the spring the cotter pin that is inserted in the holes in the awning arms are removed.
You do not need to put the screws back in.
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Depending on the make and model there is a different method to adjust the tension.
Place the step stool near the lip.
Park the rv and set the brake.
Level the rig using its jacks and level system.
Sagging is normal on older slide covers and you should make a support to keep the water out of the sagging area.
You can leave the support arms hanging freely but it might help to simply slide the stops back into the leg channel.