Lesson 1Hydraulic system basics: fluid qualities, thickness, temperature effectsWe review basic hydraulic system knowledge for finding problems, including Pascal’s law, flow against pressure roles, fluid qualities, thickness level, and how heat changes affect work, leaks, and part life in farm machines in hot climates.
Pressure, flow, and mechanical work basicsPascal’s law in mobile hydraulic circuitsViscosity, VI, and fluid film formationTemperature effects on leakage and wearChoosing correct hydraulic oil gradesLesson 2Valve and mover diagnosis: spool sticking, inside leaks, cylinder rod seal breaksFocuses on finding valve and mover faults like sticking spools, inside leaks, and cylinder seal breaks, using pressure, flow, and separate tests to split mechanical from hydraulic troubles in farm tools.
Checking for spool sticking and contaminationTesting for internal valve leakage pathsCylinder drift and piston seal evaluationRod seal inspection and leak confirmationIsolating valve versus actuator problemsLesson 3Heat-related troubles: heat breakdown, thickness change, overheating causes (radiator, fan, hydraulic oil cooler)Looks at how heat hits hydraulic work, including heat breakdown, thickness loss, and common overheating causes like coolers, fans, and radiators, plus ways to find and fix too high working temperatures in machinery.
Normal versus excessive oil temperature rangesViscosity change and loss of system stiffnessChecking coolers, fans, and airflow pathsInspecting thermostats and bypass circuitsReducing heat from throttling and leakageLesson 4Filter and tank check: element state, bypass valves, breathers and tank buildDetails checking hydraulic filters, tanks, and breathers, including spotting blocked or squashed elements, bypass valve work, tank walls, and air handling to stop air mixing, sucking in, and early part wear in systems.
Inspecting filter elements and housingsChecking filter bypass valve functionEvaluating breather type and conditionAssessing tank baffling and return flowFinding suction leaks at reservoir outletsLesson 5Fluid and dirt checks: oil sampling, particle study, water/foam findingCovers right ways to take hydraulic oil samples, check clean levels, find water, air, and mud, and read lab particle numbers to decide when to clean out, filter, or change fluid in farm machines for better life.
Proper hydraulic oil sampling locationsBottle handling and labeling for the labReading ISO particle count reportsDetecting water, foam, and air entrainmentIdentifying sludge, varnish, and oxidationDeciding when to flush or just filter oilLesson 6Pump testing and flow measure: changing vs fixed pumps, flow test steps and expected rangesExplains testing fixed and changing pumps with flow meters and pressure controls, read flow against pressure lines, and match measured output to specs to confirm pump health or spot wear in agricultural setups.
Identifying pump type and drive methodInstalling and zeroing a flow meterConducting flow under pressure testsReading flow versus pressure performanceRecognizing cavitation and aeration signsLesson 7Signs mapping: causes of slow, shaky moving under hot conditionsExplains reading slow or shaky hydraulic moves that get worse as oil heats up, linking seen signs to main causes in pumps, valves, movers, and fluid state for quicker, right trouble fixing in fields.
Recognizing heat‑dependent performance changesComparing cold start and hot operating behaviorLinking jerky motion to internal leakage pathsRelating slow actuation to pump wear or cavitationUsing symptom charts for structured diagnosisLesson 8Pressure testing and relief valve checks: setting check, pilot systems, sequence valvesTeaches safe use of pressure gauges to check system and relief settings, test pilot lines, and check sequence and balance valves, making sure pressures match specs and guarding parts from too much load or harm.
Selecting and installing pressure gaugesLocating test ports and safety practicesChecking main system relief valve settingTesting pilot‑operated relief and sequence valvesInterpreting pressure spikes and instabilityLesson 9Tools for hydraulics: flow meter, pressure gauge set, temperature probe, dirt test kitsIntroduces key hydraulic check tools, like pressure gauge sets, flow meters, temperature probes, and dirt kits, with advice on picking, safe use, setting right, and care to get sure test results in workshops.
Pressure gauge sets and quick‑couplersPortable flow meters and load valvesInfrared and contact temperature probesContamination test kits and patch testsTool calibration, storage, and safetyLesson 10Choice frame for repairs: fix vs replace pump/valves/cylinders, rebuild stepsGives a planned way to decide when to fix or replace pumps, valves, and cylinders, including cost compare, time off impact, rebuild steps, and records to make sure strong, cheap hydraulic fixes for farms.
Evaluating repair versus replacement costsAssessing downtime and machine availabilityJudging core condition for rebuildingPlanning pump, valve, and cylinder overhaulsDocumenting test results and repair history
