Investigation of the Cause of Hydraulic System Malfunction of M60A1 (AOS) Tanks using MIL-H-46170Synthetic-Base Hydraulic Fluid.

摘要

This report covers the investigation by the Chemical Subgroup of the Fire-Resistant Hydraulic Fluid Task Force. The Task Force was organized in 1975-76 to address the problems arising from the introduction of the new 'less-flammable' MIL-H-46170, 'Hydraulic Fluid, Rust-Inhibited, Synthetic Hydrocarbon Base, Fire-Resistant.' The problems were associated with stuck/inoperative servo-values in the gun control systems of the M60A1 (AOS) tanks. The problems were subsequently identified with one company's product which contained a trace amount of a water-coupling inhibitor, polypropylene glycol. The inhibitor in the presence of absorbed moisture caused coprecipitation of the rust inhibitor which deposited on the critical surfaces of spool valve systems. (Author)