09130-06491 GOVERNOR ASSY, MEC Denso Cross

S O S Analysis
S O S is composed of three basic tests:* Wear Analysis* Chemical and Physical Tests* Oil Condition Analysis Wear Analysis is performed with an atomic absorption spectrophotometer to monitor component wear rates by identifying and measuring concentrations, in parts per million, of wear elements present in the used oil.Based on known normal concentration data, maximum limits of wear elements are established. Impending failures can be identified when test results deviate from concentration levels established as acceptable, based on normal wear.Through monitoring the used oil, normal component wear trends are determined. Many failures can be identified when wear trends and/or contaminants significantly exceed past trends.Detectable failures are those caused by component wear and gradual contamination from dirt, fuel, water or antifreeze. Wear analysis is not able to predict failures due to component fatigue, sudden loss of lubrication, or sudden ingestion of a large amount of dirt or contaminants since failures of this nature occur too rapidly. Chemical and Physical Tests detect the presence of water, fuel and/or glycol (antifreeze) in the oil and determine whether or not their concentrations exceed established maximum limits. Oil Condition Analysis is evaluated with Infrared Analysis and determines the degree of deterioration of the used oil by measuring the amount of contaminants such as sulfur products, oxidation, nitration products and soot present in the used oil.It also monitors additive depletion and detects ethylene glycol and butyl cellosolve contamination and can assist in customizing (reducing, maintaining or extending) oil change intervals for particular conditions and applications.Oil Condition Analysis can help regulate (reduce, maintain or extend), oil change intervals for a specific engine in a given application and MUST always be used with Wear Element Analysis and Chemical and Physical Tests to assure accurate diagnosis. Infrared Analysis must be used to determine oil change intervals. S O S must include Infrared (IR) in the analysis.To be effective as an indicator, S O S must be performed on a continuing basis. Intermittent sampling will not allow wear rate trend lines to be established. Consult your Caterpillar dealer for complete information and assistance in establishing an S O S program for your engine(s).