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Combines & Harvesters Discussion Forum

Re: 1660 broke drive axle

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j hikemper

10-30-2012 18:29:18

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BROTHER autopsied this mess ,, it appears that the nut came loose inside the outboard gearbox ,, the axle did inded breAK ,,BUT WE BELIEVE FROM THE grinding and walking in and out ..does this seem like a common problem ?. in my above post i told of a case 1660 serveral miles to west ,,, we went to farm bureau mtg tonite and spoke with the driver /owner ,,,THIS COMBINE WAS going full bore down the road headerless , when HIT BY A GAL GOING 60 plus mph,, who disregarded the escort truck THAT WAS PULLING THE HEADER ,topped the hill and hit the combine wheel ,,the combine traveled 150 ft into a harvested field ..the gal was very shook up .,

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Jon Hagen

10-30-2012 18:53:03

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 Re: 1660 broke drive axle in reply to j hikemper, 10-30-2012 18:29:18  
Having the nut unscrew is not a common problem, but does happen. Usually related to outer wheel bearing failure. If the outboard bearing fails and allows the shaft to move in far enough so the nut contacts the dust cap, this will shear the cotter pin and allow the nut to unscrew.

If you decide to rebuild the final drive instead of replacing it, pay close attention to the case where the axles seal fits. Running for a while with a failed outer bearing will allow the axle shaft to destroy this area of the case. Also inspect the spur gears for chipped teeth if run with a fully failed bearing.

If you go with a used final drive, try to find one with the much stronger "smooth back" axle, as shown in the link I provided in my other post.

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