If you are adding the extra capacity and using it to the point where the top reservoir is empty and you are lowering the level in the LiftAll housing you are going to have problems just as Allan said if you return the oil to the top reservoir.
The reason is that once you empty the top and start to drawn down the oil level in the bottom the oil will be replaced with air. When you return the oil to the top reservoir you will continue to circulate oil through the system. The oil that is returning to the top it has to pass down the pipe between the two reservoirs as it circulates. With the oil going down the pipe the air can't get back out of the lower reservoir. It has the same effect as adding that much additional oil which will now be more than the system can hold so it will be forced out the breather.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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