Degradation Limits of Hydrocarbon-Based Hydraulic Fluids, Mil-H-5606, Mil-H-6083, Mil-H-83282 and Mil-H-46170 Used in Hydraulic Test Stands
|Publication Date:||12 May 1989|
Previous versions of AIR810 were devoted exclusively to MIL-H-5606, since it was the most widely used hydraulic fluid in military aircraft at that time. Since the latest revision of AIR810A, however, which appeared in 1968, MIL-H-5606 has been replaced in many applications by the less flammable synthetic hydrocarbon-based fluid MIL-H-83282. MIL-H-6083, a rust-inhibited version of MIL-H-5606 has found use in the hydraulic systems of tanks and armored vehicles, along with MIL-H-46170, a rust-inhibited version of MIL-H-83282. Thus, the scope of this revision of AIR810 has been expanded to include all four of these fluids.
The purpose of this report is to offer guidelines for deciding when the respective fluid has degraded to an extent that warrants replacement in hydraulic test stands. The most sensitive hydraulic components in systems using the subject fluids will dictate the limits of contamination or degradation permitted for each case. The guidelines incorporated in the AIR are the general concerns of knowledgeable professionals. However, the experience and judgment of engineers and operators responsible for the equipment must be relied upon to determine when hydraulic fluid is to be replaced.