Gearbox is toast I suspect, I changed out the same one this past summer. If you are going to do it yourself ensure you mark the chains exactly where they go on the gear box. Also ensure you put a support outside to hold up the slide when you have it extended to get at the gearbox. Not a difficult job but without those two tips its a real pain in the rear.
They need to source the gearbox's from somewhere other than China..... They fixed the issue of the spring shaft breaking and now they chew up the gears... they are made of white metal....
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