You asked: ''What would be the purpose of a TOP plug if it is never used?''
The top plug is used in two situations:
1. When doing an oil change. Open the top plug and put oil in until it weeps out of the top plug, then it's full.
2. When checking the oil level and nothing comes out of the bottom plug you close the bottom plug and open the top plug. Then add oil, a quart or more, until oil weeps out of the top plug.
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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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