Abstract
Despite its practical significance, the occurrence of seizure in tribological systems has not been fully understood. In this work, extensive actual tests on hydraulic motors under extreme operating conditions of low viscosity, high pressure and speed have been conducted with a view to investigate and understand the seizure mechanism. Some of the motors failed and they were stopped at different stages of progressive seizure. Based on these investigations, a three stage seizure process has been suggested. Stage 1 involves the breakdown of hydrodynamic oil film between roller and piston which leads to increased friction, thermal expansion and increased leakage. In stage 2, scuffing is initiated either between roller and piston or between piston and cylinder. During stage 3 scuffing propagate to several pistons.
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