CNH is now recommending that the wheel bolts be torqued to 1000 ft/lbs. We have been sanding the rims clean and torqueing the bolts to 600 for years but still having localized problems with broken bolts and rims. Have noticed some of the rims show signs of movement even though the bolts were tight so we are now torqueing to 1000 and will see what happens in the future. Thinking that with the bolts at 600, during high stress times it causes the rims to move slightly which then can break the bolts and possibly the rim. Time will tell!!!