Lesson 1Standards and terminology: ISO cleanliness codes, ASTM, NLGI, DIN/ISO references relevant to maintenanceThis part explains key oil rules and words used in work, like ISO clean codes, ASTM and DIN/ISO tests, and NLGI types, helping clear talk and right specs in upkeep plans.
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, hydrodynamicThis part describes types of lubrication like boundary, mixed, elastohydrodynamic, and hydrodynamic, linking oil film to surface roughness, weight, and speed, showing how knowing type guides oil pick and work ways.
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 criteriaThis part looks at main oil base types like mineral, PAO, ester, PAG, comparing body and chem qualities, rot stop, seal fit, and price to help pick right for factory 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 formationThis part explains NLGI grease thick grades, how cone sink links to hard, and how thick affects pump move, channel, and film make in bearings and central systems at different heat and speeds.
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 limitsThis part checks how dirt bits, water, wrong oils harm oils and parts, telling fail ways, clean goals, water caps, and real ways to watch, stop, fix dirt 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 effectsThis part builds good know of thick flow, thick index, ISO VG SAE marks, heat-thick links, showing pick and check right thick for bearings, gears, hydraulic setups.
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, detergentsThis part details common oil add families like anti-wear, EP, anti-rot, rust stop, foam stop, cleaners, telling jobs, caps, how they shape oil pick and life.
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)This part covers oil mix rules, focus on base oil groups and grease thick systems, read charts, mix risks, safe switch steps to dodge sludge, soft, seal harm.
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 mechanismsThis part starts basics of rub and wear, telling stick, scrape, tired wear, explaining how lubes make guard films to part faces and stretch part life.
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 usesThis part sorts oils, greases, solid lubes, telling how builds differ, where each used, how put way, speed, weight, place pick lube form in factory gear.
Liquid oils and circulation systemsGreases for bearings and couplingsSolid lubricants: MoS2 and graphiteDry-film and boundary lube coatingsSelecting form based on duty cycle
