If the connections are pipe threads then the best stuff to use is the teflon in a tube, without the chunks used for normal pipe systems. IF that does not work then you can try teflon tape, but it's use on hydraulic systems is usually frowned upon. It's frowned upon because if not done properly pieces of the tape will end up inside the system and cause problems. IF you use it, make sure you wrap the threads in teh right direction and insure that the tape stays at least a few threads back from the end of the fitting so there is no chance of it getting pushed into the system as the fitting is tightened.
That said if the fittings are straight thread and have o-ring seals, like many valve manifolds are, then all you need to do is get new o-rings for the proper size SAE O-ring fitting size and reseal them.
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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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