1CHAPTER 8Temperature and Contamination ControlFluid Power Circuits and Controls, John S.Cundiff, 2001INTRODUCTION zFour functions of Hydraulic fluid arezTo transmit power zTo lubricate zTo seal clearanceszTo provide cooling
has intentionally blurred sections.
Sign up to view the full version.
2INTRODUCTIONzHydraulic oil is a lubricant, which transmits power through pressure and flow, but also provides vital cooling and lubrication to moving parts. zFor optimum hydraulic component life, the oil viscosity should be maintained in an acceptable range and the contamination level should be minimized. TEMPERATURE CONTROL zOperating temperatures consistently above 160oF promote chemical reactions that change the properties of the oil.zThe effects of high temperature are : zOxidation of the oil.zFormation of insoluble gums, varnishes and acids.zDeterioration of seals (they harden and leakage begins)zLoss of lubricity zChanges in viscosity