Lesson 1Hydraulic system fundamentals: fluid properties, viscosity, temperature effectsReview hydraulic system basics needed fi diagnosis, includin' Pascal’s law, flow versus pressure roles, fluid properties, viscosity index, an' how temperature changes affect efficiency, leakage, an' component life in farm machinery.
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 an' actuator diagnosis: spool sticking, internal leakage, cylinder rod seal failureFocus pon diagnosin' valve an' actuator faults such as sticking spools, internal leakage, an' cylinder seal failures, usin' pressure, flow, an' isolation tests to separate mechanical from hydraulic problems in agricultural equipment.
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 issues: thermal breakdown, viscosity change, overheating sources (radiator, fan, hydraulic oil cooler)Examine how heat affect hydraulic performance, includin' thermal breakdown, viscosity loss, an' common overheating sources such as coolers, fans, an' radiators, plus methods to diagnose an' correct excessive operating temperatures.
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 an' reservoir inspection: element condition, bypass valves, breathers an' tank designDetail inspection of hydraulic filters, reservoirs, an' breathers, includin' recognizin' plugged or collapsed elements, bypass valve operation, tank bafflin', an' air management to prevent aeration, cavitation, an' premature component wear.
Inspecting filter elements and housingsChecking filter bypass valve functionEvaluating breather type and conditionAssessing tank baffling and return flowFinding suction leaks at reservoir outletsLesson 5Fluid an' contamination checks: oil samplin', particle analysis, water/foam detectionCover correct techniques fi drawin' hydraulic oil samples, evaluatin' cleanliness classes, detectin' water, air, an' sludge, an' interpretin' lab particle counts to decide when to flush, filter, or change fluid in farm machinery.
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 an' flow measurement: variable vs fixed pumps, flow test procedures an' expected rangesExplain how to test fixed an' variable displacement pumps usin' flow meters an' pressure controls, interpret flow versus pressure curves, an' compare measured output to specifications to confirm pump health or detect wear.
Identifying pump type and drive methodInstalling and zeroing a flow meterConducting flow under pressure testsReading flow versus pressure performanceRecognizing cavitation and aeration signsLesson 7Symptoms mapping: causes of slow, jerky actuation under hot conditionsExplain how to interpret slow or jerky hydraulic movements dat worsen as oil temperature rises, linkin' observable symptoms to likely root causes in pumps, valves, actuators, an' fluid condition fi faster, accurate troubleshootin'.
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 an' relief valve checks: settin' verification, pilot systems, sequence valvesTeach safe use of pressure gauges to verify system an' relief settings, check pilot circuits, an' evaluate sequence an' counterbalance valves, ensurin' pressures match specifications an' protectin' components from overload or damage.
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 fi hydraulics: flow meter, pressure gauge set, temperature probe, contamination test kitsIntroduce essential hydraulic diagnostic tools, includin' pressure gauge sets, flow meters, temperature probes, an' contamination kits, wid guidance pon selection, safe use, calibration, an' care to ensure reliable test results.
Pressure gauge sets and quick‑couplersPortable flow meters and load valvesInfrared and contact temperature probesContamination test kits and patch testsTool calibration, storage, and safetyLesson 10Decision framework fi repairs: repair vs replace pump/valves/cylinders, rebuildin' proceduresProvide a structured approach to decide when to repair or replace pumps, valves, an' cylinders, includin' cost comparison, downtime impact, rebuild procedures, an' documentation to ensure reliable, economical hydraulic repairs.
Evaluating repair versus replacement costsAssessing downtime and machine availabilityJudging core condition for rebuildingPlanning pump, valve, and cylinder overhaulsDocumenting test results and repair history
