Lesson 1Standards and terminology: ISO cleanliness codes, ASTM, NLGI, DIN/ISO references relevant to maintenanceDis part explain di key standards and words used for lubrication in industry, like ISO cleanliness codes, ASTM and DIN/ISO test methods, and NLGI grades, so you fit talk di same language and specify tin-tin correct for maintenance work.
ISO particle cleanliness code structureASTM test methods for lubricantsDIN and ISO viscosity classificationNLGI grease consistency numberingReading lube labels and data sheetsLesson 2Lubrication regimes: boundary, mixed, elastohydrodynamic, hydrodynamicDis part describe di different lubrication ways like boundary, mixed, elastohydrodynamic, and hydrodynamic, connecting film thickness to surface roughness, load, and speed, and show how to know which one to use for choosing lubricant and operating.
Stribeck curve and key parametersBoundary lubrication characteristicsMixed lubrication in real contactsEHL in rolling element bearingsFull hydrodynamic film conditionsLesson 3Lubricant base stocks: mineral, PAO, ester, PAG — properties and selection criteriaDis part look at main lubricant base types like mineral, PAO, ester, and PAG oils, comparing dem properties, how dem no spoil quick, how dem work with seals, and cost, to help you pick di right one for different jobs.
API mineral base oil groupsPAO synthetics: strengths and limitsEster fluids: benefits and cautionsPAG fluids and water-mixable typesMatching base stocks to applicationsLesson 4NLGI consistency for greases and how consistency affects pumpability and film formationDis part explain NLGI grease grades, how cone penetration show hardness, and how thickness affect pumping, channeling, and film making in bearings and central systems when temperature and speed change.
Cone penetration and NLGI gradesConsistency vs pumpability in linesChanneling and grease distributionEffect on film thickness in bearingsTemperature impact on consistencyLesson 5Contamination effects: particulate, water, and incompatible lubricants — consequences and limitsDis part show how dirt particles, water, and wrong mixed oils spoil lubricants and parts, explaining failure ways, cleanliness goals, water limits, and practical ways to check, stop, and fix contamination while in use.
Particle-induced wear mechanismsWater contamination sources and limitsEffects of mixing foreign lubricantsCleanliness targets and ISO codesFiltration and dehydration practicesLesson 6Viscosity fundamentals: viscosity, viscosity index, ISO VG, SAE grades, temperature effectsDis part build strong understanding of viscosity behavior, viscosity index, ISO VG and SAE grades, and how temperature affect viscosity, showing how to pick and check di right thickness for bearings, gears, and hydraulic systems.
Dynamic vs kinematic viscosityViscosity index and its significanceISO VG grades and selection rulesSAE engine and gear oil gradesTemperature–viscosity charts and toolsLesson 7Additives: anti-wear (ZDDP), EP, antioxidants, rust/corrosion inhibitors, anti-foam, detergentsDis part detail common lubricant additives like anti-wear, EP, antioxidants, rust and corrosion stoppers, anti-foam, and cleaners, explaining wetin dem do, dem limits, and how dem affect choosing and lifespan of lubricant.
Anti-wear and EP chemistry basicsOxidation control and antioxidantsRust and corrosion inhibitor rolesAnti-foam and air release additivesDetergent and dispersant actionsLesson 8Basic lubricant compatibility and mixing rules (base oil and thickener compatibility)Dis part cover rules for mixing lubricants, focusing on base oil types and grease thickeners, how to read compatibility charts, risks of mixing, and safe ways to change to avoid sludge, softening, or seal damage.
Base oil family compatibility basicsGrease thickener compatibility matrixRisks of mixing incompatible lubricantsFlushing and changeover best practicesUsing OEM and supplier guidanceLesson 9Principles of friction, wear, and lubrication mechanismsDis part introduce basics of friction and wear like sticking, scratching, and tiredness wear, and explain how lubrication ways make protective films to separate surfaces and make parts last longer.
Types of friction in machine elementsAdhesive, abrasive, and fatigue wearSurface roughness and contact areaRole of lubricant films in protectionRelating wear modes to field symptomsLesson 10Types of lubricants: oils, greases, solid lubricants, and their general usesDis part classify oils, greases, and solid lubricants, explaining how dem structures different, wey places dem use well, and how application, speed, load, and place affect choice of lubricant type in machines.
Liquid oils and circulation systemsGreases for bearings and couplingsSolid lubricants: MoS2 and graphiteDry-film and boundary lube coatingsSelecting form based on duty cycle
