Heavy Machinery Mechanics Course

Lesson 1 • Mechanical Principles for Heavy Equipment

Applies force, torque, leverage, and friction concepts to heavy machinery contexts. Provides the physics foundation needed to understand component behavior under load.

Lesson 2 • Tools, Fasteners, and Torque Specifications

Introduces hand tools, power tools, and precision measuring instruments used in heavy equipment maintenance. Correct torque application prevents fastener failure in all repair tasks.

Lesson 3 • Heavy Equipment Categories and Applications

Covers excavators, dozers, loaders, graders, and cranes by function and capacity. Builds vocabulary essential for all subsequent diagnostic and repair work.

Lesson 4 • Reading Technical Manuals and Schematics

Teaches interpretation of OEM service manuals, parts catalogs, and wiring diagrams. Accurate schematic reading is prerequisite to every diagnostic procedure in later chapters.

Lesson 1 • Cooling System Inspection and Service

Addresses radiator, water pump, thermostat, and coolant chemistry in heavy equipment engines. Cooling system failures cause catastrophic overheating, making this service critical.

Lesson 2 • Engine Lubrication System Service

Covers oil pump operation, filter types, oil analysis, and change intervals for heavy-duty engines. Proper lubrication prevents the most common causes of premature engine failure.

Lesson 3 • Air Intake and Exhaust System Service

Covers air filter maintenance, turbocharger inspection, and exhaust restriction diagnosis. Clean air delivery directly affects fuel efficiency and engine longevity.

Lesson 4 • Diesel Engine Fundamentals

Explains the four-stroke diesel cycle, combustion chemistry, and compression ignition principles. This foundation supports all engine diagnosis and overhaul work in the chapter.

Lesson 1 • Control Valves and Actuators

Covers directional, pressure, and flow control valves and their roles in circuit control. Valve function knowledge is required for all hydraulic fault isolation in later chapters.

Lesson 2 • Hydraulic Pumps and Motors

Identifies gear, vane, and piston pump designs and explains their operating characteristics. Understanding pump output is essential for diagnosing low-pressure and flow faults.

Lesson 3 • Hydraulic Fluid Mechanics Fundamentals

Applies Pascal's law, flow rate, and pressure concepts to hydraulic circuit behavior. These principles underpin every hydraulic diagnosis and repair task in the course.

Lesson 4 • Hydraulic Hoses, Fittings, and Seals

Covers hose construction, pressure ratings, fitting types, and seal material compatibility. Correct hose and seal selection prevents leaks and catastrophic circuit failures.

Lesson 1 • Powershift and Automatic Transmissions

Covers planetary gear sets, clutch packs, and electronic shift control in powershift transmissions. Proper shift calibration prevents clutch slippage and premature wear.

Lesson 2 • Braking Systems in Heavy Equipment

Explains wet disc, dry disc, and dynamic braking systems used across heavy equipment platforms. Brake system integrity is a primary safety requirement on every machine.

Lesson 3 • Final Drives and Sprocket Systems

Covers planetary final drives, sprocket wear measurement, and track drive alignment on crawler equipment. Final drive failures are among the most costly repairs in heavy equipment.

Lesson 4 • Differentials and Axle Assemblies

Addresses bevel gear sets, limited-slip differentials, and axle shaft inspection in heavy equipment. Differential service prevents uneven tire wear and loss of traction control.

Lesson 1 • Boom, Stick, and Attachment Structures

Covers inspection of excavator booms, loader arms, and quick-coupler systems for wear and damage. Attachment structural integrity is critical for safe lifting and digging operations.

Lesson 2 • Track Tension Adjustment and Alignment

Covers grease-type and hydraulic track adjusters and correct tension measurement procedures. Improper tension accelerates wear on all undercarriage components simultaneously.

Lesson 3 • Track System Components and Wear

Identifies track links, pins, bushings, rollers, and idlers and explains their wear patterns. Accurate wear measurement determines replacement timing and prevents catastrophic track failure.

Lesson 4 • Main Frame and Structural Inspection

Teaches visual and dye-penetrant inspection of frames, pivot pins, and weld joints for cracks. Structural defects must be identified before they cause catastrophic machine failure.

Lesson 1 • Sensors, Actuators, and CAN Bus Networks

Explains pressure, temperature, and position sensors and their signal types in electronic control systems. CAN bus communication links all control modules on modern heavy equipment.

Lesson 2 • Electronic Control Module Diagnostics

Teaches scan tool connection, fault code retrieval, and parameter monitoring on heavy equipment ECMs. Systematic ECM diagnosis reduces misdiagnosis and unnecessary component replacement.

Lesson 3 • Wiring Harness Repair and Circuit Protection

Covers connector inspection, wire repair techniques, and fuse and relay diagnosis in heavy equipment. Proper harness repair restores circuit integrity and prevents recurring electrical faults.

Lesson 4 • Starting, Charging, and Battery Systems

Covers battery testing, starter motor diagnosis, and alternator output verification on heavy equipment. Reliable starting and charging are prerequisites for all electronic system operation.

Lesson 1 • Pump and Motor Overhaul

Teaches disassembly, inspection, and reassembly of gear and piston pumps and hydraulic motors. Correct clearance and torque specifications restore rated pump efficiency after overhaul.

Lesson 2 • Hydraulic Cylinder Rebuild

Teaches cylinder disassembly, rod inspection, honing, and seal replacement for heavy equipment cylinders. A properly rebuilt cylinder eliminates drift, leaks, and reduced lifting capacity.

Lesson 3 • Pressure and Flow Testing Procedures

Covers gauge installation, flow meter use, and relief valve setting verification on live circuits. Accurate pressure and flow data confirm whether faults are in the pump, valve, or actuator.

Lesson 4 • Control Valve Repair and Adjustment

Covers spool cleaning, O-ring replacement, and pressure setting adjustment for directional and relief valves. Valve repair restores precise machine movement control and prevents drift.

Lesson 1 • New Machine Commissioning Procedures

Covers pre-delivery inspection, fluid fill verification, break-in operation, and initial service for new equipment. Proper commissioning prevents early failures and validates warranty compliance.

Lesson 2 • Preventive Maintenance Program Design

Covers interval-based and condition-based maintenance strategies for heavy equipment fleets. A well-designed PM program maximizes uptime and reduces total cost of ownership.

Lesson 3 • Machine Inspection and Condition Reporting

Teaches systematic walk-around inspection, defect grading, and condition report writing for heavy equipment. Accurate condition reports drive repair prioritization and fleet management decisions.

Lesson 4 • Fluid and Filter Service Consolidation

Integrates engine, hydraulic, transmission, and final drive fluid services into a single efficient workflow. Consolidated service reduces machine downtime and technician labor hours.