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The front tires on my x730 with ~900 hours were done, so I took the wheels off yesterday & had new tires mounted. I noticed that there are no zerks on these wheels. It seems like the “axle” the wheels mount to ought to be lubricated occasionally, though. Should I just apply a light coating of grease or is there some reason that’s a bad idea? JD manual under “service lubrication” does not indicate this area for lubrication.
 

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There are no zerks because the wheels have sealed wheel bearings. The inner part of the wheel bearing slips over the spindle shaft. No lubrication is needed because nothing is rubbing. There certainly wouldn't be any harm in applying a very light coating of grease to prevent corrosion and allow the wheels to slide off easier.
 

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I go with light grease myself. A zero would be easier to use a lot of grease often, it really only needs a wipe every few years and it only takes a couple minutes with a floor jack and an organized tool box.
 
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