Generally hydraulic oils have more anti-foaming agents, possibly different or more anti-wear agents, which can be a benefit for most hydraulic systems. Also a few like Hytran can keep a relatively large amount of water in suspension, thereby insuring the pump/valve has at least some oil lubrication rather than occasionally ingesting only water. The motor oil detergents are not a benefit, nor are the additives which neutralize the combustion by-products. Personally I substitute Low-Vis Hy-Gard for SAE 10W hydraulic oil, and as you already do, use standard Hy-Gard for situations requiring a heavier hyd oil. But in a low pressure, lower flow system, most any oil will work satisfactory.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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