ITI Mechanic Tractor (AITT Theory) study plan

Sketch and label the four-stroke and two-stroke cycles, marking valve/port events, piston position and pressure trend, then explain each stroke aloud in under two minutes without notes.

Calculate compression ratio, swept volume and thermal efficiency for three worked engine examples and check each answer against the formula sheet you build.

Trace fuel flow from tank through filter, lift pump, injection pump and injector on a diesel tractor layout, naming the function of each component.

List the main cooling-system components and state the consequence of a stuck-open thermostat versus a blocked radiator core.

Classify lubrication systems (splash, pressure, full-flow filtration) and match each to a tractor engine type with one advantage and one failure mode.

Draw a power-flow diagram from engine flywheel through clutch, gearbox, differential and final drive to the wheel, and mark where torque multiplication and speed reduction occur.

Compare dry single-plate, dual-plate and wet clutch designs on engagement, heat dissipation and adjustment needs, in a three-row table.

Explain the purpose of each gearbox shaft and gear pair in a sliding-mesh and a synchromesh arrangement, and describe what happens if a synchroniser ring wears.

Describe differential action during a turn, state why a locking or limited-slip differential helps in field work, and identify the parts that fail first under overload.

Solve five numerical problems on gear ratio, output speed and tractive torque using wheel radius and final-drive ratio.

Sketch manual, hydrostatic and power-assisted steering layouts, and state the inspection points and typical faults for each.

Compare drum and disc brakes on a tractor, and explain bleeding procedure order, pedal-fade causes and parking-brake adjustment.

Read a tyre size code and load/speed marking, then explain ply rating, tread patterns, inflation effects and the rules for dual or radial-versus-bias selection.

Trace hydraulic oil flow in an open-centre system from pump through relief valve, control valve, cylinder and return, and state the function of each.

Explain draft, position and mixed control in a three-point linkage, and describe how to set up and check lift-arm and top-link adjustment for a mounted implement.

Identify the hazards of tractor workshop and field work (rotating PTO, jacking, fuel handling, battery acid, hydraulic injection) and match each to a specific control measure.

Demonstrate correct use of a fire extinguisher class selection and describe first-aid response for hydraulic-fluid injection and acid splash.

Perform and record ten measurements with vernier calliper, micrometer and feeler gauge, including zero-error checking and correct reading to the least count.

Explain the procedure for drilling, tapping and reaming a hole to a specified fit, and classify the fit produced.

Describe safe jacking and axle-stand placement on a tractor, and the checks before working under a raised machine.

Interpret orthographic views, section views and a simple assembly drawing, and produce a freehand sketch of a bracket with dimensions and tolerances.

Select a material for three given tractor components (gear, axle shaft, gasket) and justify each choice by property, heat treatment and cost.

Explain lead-acid battery construction, state of charge measurement by hydrometer and open-circuit voltage, and the correct boost-starting sequence.

Trace the starting circuit and the charging circuit separately, naming alternator, regulator, solenoid and safety start switch functions.

Diagnose three common electrical faults (no crank, no charge, battery drains overnight) by describing the test sequence and expected readings.

Describe the calibration and phasing checks on an inline injection pump, and explain the symptoms of incorrect injection timing.

List the steps of a full engine service (oil and filter, coolant, air cleaner, fuel filters, belt tension) in correct order with the reason for each step.

Build a troubleshooting table that maps five symptoms (hard starting, black smoke, overheating, low oil pressure, excessive fuel use) to at least three causes each and the confirming test.

Explain how to interpret oil analysis, coolant condition and blow-by results when deciding whether to open an engine.

State the inspection intervals and rejection criteria for liners, rings, valves and bearings from a workshop manual specification.

Carry out a simulated clutch and brake adjustment sequence, recording the free play and pedal travel values before and after.

Explain the procedure to test hydraulic system pressure with a gauge, and state the safe working limits and relief-valve setting checks.

Diagnose a weak three-point lift and a slow hydraulic response, listing causes and the order in which to eliminate them.

Describe wheel alignment checks, toe-in setting, bearing play and tyre wear patterns that indicate steering or alignment faults.

Explain PTO speed selection, drawbar and hitch categories, and the safety checks before attaching an implement.

Complete two full-length timed mock tests under exam conditions and score each by domain to find weak areas.

Re-study only the two lowest-scoring domains and rewrite their key facts into a one-page recall sheet each.

Recite from memory the safety rules, measurement least counts, gear-ratio formulas and electrical test values most likely to be asked.

Review every earlier deliverable and correct errors, then summarise each domain in five bullet points.