There is a an ACME threaded rod, and a ACME threaded nut inside each of the landing gears.... if you don't understand an ACME thread please do some research...
As the threads and the nut wears.... the lead screw and nut will function in the center of the threaded rod where it is most used... as it goes to either its upper limit or its lower limit it will start to bind and overload the electric motor.... It will seem like the bevel gears are bad, or that the electric motor is bad...
The easiest way to diagnosis this problem is to put the unit on a set of bottle jacks and remove the cross rod on the two landing legs... attach a cordless drill to the connection and drive the leg up and down, making sure that the extension leg is either off the landing leg or in the full up position..
As you run this with your drill, you can feel your drill run smoothly in the middle of the travel.... as it approaches the top or the bottom of the stroke you can hear the drill motor load up....
Thee are no parts available for most of these legs so just be prepared to buy new ones... DO NOT REPLACE ONLY ONE unless you absolutely know the brand.... the competitive brands don't often have the same turns per inch.... Usually 5 turns to 8 turns per inch.... the more turns per in the more load the leg will lift...
This is not a difficult job for someone who has basic skills... the one caution is to only lift the coach with suitable jacks capable of the weight evolved... use bottle jacks and never a automotive style floor jack..
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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