Having trouble with a 96 553 Bobcat. It has a kubota diesel with direct drive to the pumps. for the last 6 months I have been fighting a hyd oil foaming problem. it has gotten so bad that if I use it very long, it foams out the vent. two mechanics have said I have a oil compatibility issue ( started right after I used a backhoe attatchment that I had loaned out). I am only able to change the oil in the resivour. they said 3 times should fix it. I have done it 5 times and it is getting worse. 2 other mechanics said I have a pinhole size leak in the suction side of the hyd system. I have removed the two suction hoses, inspected them. then air preasure tested them in a water tank. no leaks. checked all fittings and clamps for tight on the suction side of the system. It is not leaking oil. HELP!!! NEED IDEAS. and no, I don"t think it has rabies.
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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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