Several things. Heat and cold cycles and age eventually harden the rubber compound being used. It also slowly fatigues the spring behind the lip. Older leather lip seals dried up if they were allowed to sit for long periods, plus they simply wore out. If you ever look at a National Seal size catalog, there are many pages describing lip styles and various rubber compounds to use depending on the application, rotation speed, and the type of fluid to be sealed. Back when they first started using rubber seals in automotive applications, the material, Buna-N, I believe, worked well, but it hardened up after a few years. The newer rubber compounds they use today include polyacrylate and others that have a WAY longer life, and new ideas about lip designs have extended the efficiency of seals greatly. Contaminants in the fluid are also a factor in determining how long a seal will last.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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