Posted by JD Seller on August 28, 2019 at 20:36:57 from (208.126.198.213):
In Reply to: Built to fail posted by John in La on August 28, 2019 at 15:23:49:
John and a lot of the other fellows on here need to think a little bit on this one. LOL (I asked this same question 20 years ago when JD first did this.) The bearing number was JD 9296, the same clear back to the decks on the original JD 110 lawn tractors.
Think about how a lip seal works. They are sealed to keep grease IN the bearing. So you have two bearings with an open cavity between them. The grease zerk/passage puts pressurized grease in this cavity. So when the grease hits the seal the grease lifts the lip of the seal that is towards the cavity and goes right into the bearing. The seal on the OUTSIDE has its lip facing in towards the grease and holds it inside the bearing.
To test this take a thin piece of flat plastic. I like using an old microfiche card. You can easily slip it under the seal of most common bearings. Some bearings have a double lip seal that faces each way but they are not very common.
These grease fittings are supposed to be greased after every 100 hours of use. They are only to get one or two pumps at that time. I have replaced very few of these bearings after JD put the grease fittings in the decks. They also spaced the bearings further apart then the ones in the older decks. These two things made these bearings failing a rare event.
The ones I have had to replace failed because of one or two things:
# 1 cause of failure!!!! Old farmer types acting like it was an old corn picker that needed the bushings greased every day and then pump until you see grease squirting out. Well great on the old stuff not so great on a sealed bearing. That can easily blow the seals out and make the bearing fail. Also fills the top of the deck with grease that can then get on the drive belt and pulleys.
#2 common cause of failure. Something wrapping around the lower part of the spindle and then working itself under the wrap shield and ruining the lower bearing seal. Most common around farm yards was mesh wrap. Most common around cabins was fishing line.
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