Session Listing

Here is a complete list of all the subjects we cover.

20 Electrical Sessions

Basic Electrical Concepts

Updated March, 20184 Materials

When studying electrical circuits, you need to start with the fundamentals: Voltage, Current, and Resistance.

Learn about: Amps, Ohm's Law, Current, Voltage, Power, Watts, Ohms, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Transceiver, Node, NRZI, Message Frame, Controller, Non-Return to Zero Inverted, Check Field, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Pin/Plug, Solder, Coaxial, Power, Weather Pack, Female, Plug, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: N-type, NPN, Light Emitting Diodes, Bias, Circuit, Flyback, LED, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: Zero Energy, Static Dissipative Footwear, Burn, Electrically Insulated Footwear, Electrical PPE, Flame Resistant, , and a whole lot more.

Electrical Measurements

Updated January, 20174 Materials

Digital Multimeters (DMM) are one of the most powerful tools available to electricians.

Learn about: Electrician, Voltmeter, Short Circuit, Test For Blown Fuse, Digital Multimeter, Fluke Meter, Measurement, and a whole lot more.

Flow Sensors

Updated July, 20183 Materials

Both the electromagnetic flow meter and the mass flow meter measure flow without adding a turbine or a restriction to the mix.

Learn about: Electromagnetic Flow Meter, Density, , Flow, Faraday's Law of Electromagnetic Induction, Conductive, Magnetic Field, and a whole lot more.

Fuses & Circuit Breakers

Updated January, 20172 Materials

This mini-session gives you a quick overview of these critical circuit protection devices.

Learn about: Fuse, Fast acting fuse, Blown Fuse, Digital Multimeter, Slow blow fuse, Testing Fuses, Inspecting Fuses, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Connection, Bus, Standard, Tag, Off-Page, Signal Ground, Electrician, and a whole lot more.

Open & Short Circuit Faults

Updated April, 20197 Materials

In this session, you'll apply electrical principles to troubleshooting.

Learn about: Short Circuit Fault, Short Circuit, Electrician, Skill, Troubleshooting, Ten Step Troubleshooting Process, Open Circuit, and a whole lot more.

Position Sensors

Updated July, 20189 Materials

Inductive, Capacitive, Photoelectric and Ultrasonic proximity sensors are covered in this session.

Learn about: Sensor, Capacitive, Diffuse, Retroreflective, Inductive, Proximity, Through-Beam, and a whole lot more.

Pressure Sensors

Updated July, 201810 Materials

Pressure sensing can be done with one of several kinds of technologies.

Learn about: psig, Differential, Absolute Pressure, Indicator Fluids, Manometer, Pascal, Strain Gauges, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Schematic Symbol, Single Pole Double Throw, Throw, Relay, Diagnostic, Troubleshooting, Electrical Circuit, and a whole lot more.


Updated January, 20173 Materials

Transistors are the focus of this session, plus you'll learn how to prevent damage to these sensitive components.

Learn about: Metal Oxide Varistor, FET, Semiconductor, Troubleshooting, Maintenance, Component, Schematic, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Normalizing, Sinking, Sensor, Lower Range Value, Calibration, PNP, Span, and a whole lot more.

Series & Parallel Circuit Basics

Updated August, 20199 Materials

Series and parallel circuits are at the heart of every electrical system.

Learn about: Branch, System Design, KVL, Series, Troubleshooting, Electrical Circuit, Kirchoff's Voltage Law, and a whole lot more.

Starting & Charging Systems

Updated January, 20173 Materials

Dig into mobile electrical circuits with this session on starting and charging systems.

Learn about: Electrical, 24V, Starter, Troubleshooting, Equalizer, 12V, Alternator, and a whole lot more.


Updated July, 201913 Materials

Switches are one of most common control elements used in electrical circuit design.

Learn about: Switch, On-Off-On, Three Way Switching, Throw, Normally Closed, Rating, Normally Open, and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: 2 lead, Variable Resistor, Potentiometer, wiper, Resistance, Rheostat, AC temperature control, and a whole lot more.

Waveforms & Signal Generation

Updated October, 20188 Materials

Direct current is common in low voltage systems, but as soon as you start working with high voltage, you'll need to know about alternating current.

Learn about: Hertz, Amplitude, ECM, Digital Control, Hz, AC, Electrical Current, and a whole lot more.

23 Hydraulics Sessions

Cartridge Valves

Updated December, 20184 Materials

In this session you'll find an in-depth introduction to slip-in cartridge valves.

Learn about: relief valves, two-port slip-in cartridge valves, hydraulics, valve cover plate, passive control, logic valve circuits, throttle valves, and a whole lot more.

Counterbalance Valves

Updated September, 20197 Materials

Counterbalance valves allow raised loads to be lowered safely, with a minimum of wasted energy.

Learn about: Motion Control, Runaway Load, Raised Load, Counterbalance Valve, Load Holding, Adjusting a Counterbalance Valve, Safety, and a whole lot more.

Cross-Port Relief Valves

Updated January, 20175 Materials

Cross-port relief valves expand on the standard relief valve to control otherwise destructive pressures created by external forces acting against an actuator.

Learn about: Braking Valves, Regenerative, Cross-Port Relief Valves, Flywheel Mass, Overpressure, and a whole lot more.

Electro-Hydraulic Valves

Updated April, 20196 Materials

Enter the world of electro-hydraulic valves in this session.

Learn about: servo valves, electro-hydraulic valves, proportional valves, moog, and a whole lot more.

Fixed & Variable Displacement Pumps

Updated September, 201930 Materials

If you have questions about hydraulic pumps, this is the session for you.

Learn about: Unbalanced Vane Pump, Driven Gear, Internal Gear Pump, Inlet, Balanced Vane Pump, Cam Ring, Heat, and a whole lot more.

Flow & Directional Control Valves

Updated September, 201930 Materials

This session is absolutely packed with fun lessons and interactive animations.

Learn about: Tandem, Response, Operator, Main Valve Section, Troubleshooting, Pilot, Two Section Valves, and a whole lot more.

Fluid Power Basics

Updated September, 20188 Materials

If you're looking for the starting point in your study of hydraulics, this is it.

Learn about: FPA Triangle, Force, Dynamic Pressure, Gallons Per Minute, Energy, Newtons, Flow Viscosity, and a whole lot more.

Hydraulic Accessories

Updated September, 201911 Materials

This session covers a handful of hydraulic accessories.

Learn about: Filters, Diameter, Sleeve, Bladder, Piston, NPT, Precharge, and a whole lot more.

Hydraulic Actuators

Updated September, 201913 Materials

Linear and rotary actuators are the muscles of a hydraulic system.

Learn about: Blind End, TSTP, Cylinder, Rotary Actuator, Rod End, Motor, Troubleshooting, and a whole lot more.

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

Learn about: System Adjustment Hazards, Pinch Points, Unexpected Motion, Hose and Fitting Failure, Zero Energy State, Heat, Flammability, and a whole lot more.

Hydraulic Schematic Symbols

Updated August, 201910 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: mechanical linkage, hydraulic pilot, rotation, reservoir, cylinder, tank, cartridge valve, and a whole lot more.

Hydraulic Steering

Updated September, 20197 Materials

This session will go into detail on hydraulic power steering and how it works.

Learn about: HMU, hydraulic steering, steering valve, orbitrol, power steering, Hand Metering Unit, and a whole lot more.

Hydrostatic (Closed Loop) Systems

Updated October, 201917 Materials

Get right into the design of closed loop systems with colourful graphics and detailed drawings.

Learn about: Cavitation, Charge Pump, Direct Linkage, Hydrostatic Loop, Closed Loop, Heat, Hot Oil Shuttle Valve, and a whole lot more.

Load Sensing Pumps

Updated September, 201918 Materials

This animated and interactive session takes the mystery out of load sense.

Learn about: Flow Control, Orifice, Pressure Differential, Load Sensing Compensator, Equilibrium, Piston Pump, Margin Pressure, and a whole lot more.

Open & Closed Center Systems

Updated September, 201910 Materials

This session tackles the differences and similarities between open and closed center systems.

Learn about: Open Loop, Sectional Valve Bank, Closed Loop, Open Center, Closed Center, Mobile, and a whole lot more.

Parallel & Series Systems

Updated September, 201920 Materials

Parallel and Series circuits behave very differently.

Learn about: Branch, Series Circuits, System Pressure, Path of Least Resistance, Pressure Drops, Load, Restriction, and a whole lot more.

Positive & Non-Positive Pumping

Updated May, 201816 Materials

Positive and Non-Positive Pumping tackles the differences between the two types of systems, and the design and maintenance needs of each.

Learn about: Flooded Inlet, Void Bubbles, Positive Pressure, Positive Displacement, Air, Breather, Partial Vacuum Pressure, and a whole lot more.

Pressure & Flow

Updated October, 201923 Materials

This session gets you started with a solid foundation on pressure and flow basics.

Learn about: Slippage, FPA Triangle, Hydraulic Pressure, Fluid Velocity, Hydraulic Flow, Velocity, Flow Rate, and a whole lot more.

Pressure Reducing Valves

Updated September, 20197 Materials

Pressure reducing valves function very differently than relief valves, even though their schematic symbols look very similar.

Learn about: Pressure, Normally Closed, Direct Acting, Pressure Reducing Valve, Pilot Operated, Downstream Pressure, and a whole lot more.

Pressure Relief Valves

Updated September, 201927 Materials

Jump into relief valves with this colorful session.

Learn about: normally closed, direct acting relief, balanced relief valve, spring, setting pressure, spool, counterbalance valves, and a whole lot more.

Sequence Valves

Updated August, 20195 Materials

Sequence valves are used on many machines to choreograph hydraulic functions.

Learn about: Set Pressure, Sub-Circuit, Pressure, Hydraulic, Sequence, Valve, Training, and a whole lot more.

Troubleshooting Processes

Updated January, 20177 Materials

Troubleshooting a hydraulic system can be a demanding and tricky task.

Learn about: Downtime, Failure, Guess and Check, Hit or Miss, easy-to-check order, Ten Step Troubleshooting Process, TSTP, and a whole lot more.

Unloading Valves

Updated September, 20197 Materials

Unloading valves are often confused with relief valves, but they play a unique role in hydraulic systems.

Learn about: Balanced Relief Valve, Energy Saving, Unloading Valve, Efficient, External Pilot Section, Pressure Pump , Fast Approach Slow Feed Circuit, and a whole lot more.

16 Machinery Sessions

Blast Hole Drills

Updated March, 20183 Materials

This session gets you right into the hydraulic circuit sections in a common blast hole drill.

Learn about: Holdback, Animation, Atlas Copco, Brakes, Propel, Drill, Simulation, and a whole lot more.

Cat Excavators

Updated September, 20183 Materials

Familiarize yourself with the inner workings of excavator hydraulic systems that are specific to Caterpillar.

Learn about: Track Drive, 385C, Bucket Circuit, Swing Circuit, CAT, Excavator, Boom Circuit, and a whole lot more.

Cat Haul Trucks

Updated May, 20192 Materials

Explore Caterpillar haul trucks with a couple animated circuits in this session.

Learn about: Hoist Circuit, Haul Truck, Simulations, Steering Circuit, and a whole lot more.

Coal Stacker-Reclaimer

Updated June, 20182 Materials

Coal stacker-reclaimers are used to either receive coal or to stockpile it.

Learn about: Hoist Circuit, Coal, Mining Equipment, Stacker, Reclaimer, and a whole lot more.

Coiled Tubing Units

Updated September, 20194 Materials

This session is specific to coiled tubing units and problems related to injector chain tension and traction.

Learn about: Coil tubing injector, coiled tubing, hydraulic faults , injector traction, chain tension, and a whole lot more.

Deere-Hitachi Excavators & Shovels

Updated July, 201825 Materials

In the world of excavators & shovels, there are a lot of specialized hydraulic components used to solve problems specific to such large mobile machinery.

Learn about: solenoid valves, pump controller, heavy machinery, Electro-hydraulic control valve, EHC Valve, pump regulator, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: generation, dam, hydraulic, regulate, governor, engine, electricity, and a whole lot more.

Komatsu Haul Trucks

Updated September, 20187 Materials

Check this session out for a bundle of 830E and 930E Live Schematics.

Learn about: Split Spool Section, Inlet Section, Hoist, Live Schematic, Hydraulic, 930E, Brakes, and a whole lot more.


Updated October, 20198 Materials

Get to know your way around the hydraulics on a loader with the advanced simulations in this sessions.

Learn about: Bucket, Wheel Loader, Boom, Auxiliary, Steering, Lift, Mobile Equipment Hydraulic, and a whole lot more.

Lube Systems

Updated September, 20192 Materials

Keeping bearings and gears lubricated in a production environment often involves a pumped lubricant.

Learn about: Simulation, Hydraulic Lube Systems, Lubricant, Bearings, and a whole lot more.

Oilfield Cementing

Updated May, 20181 Material

Oilfield cementing has driven industrial process technology to produce many specialized components, which you'll learn about in this session.

Learn about: Mixing Head, Cement Metering Valve, Dry Blending, Dust, Air Entrainment, Cementing, Clumping, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Maintenance, Suction Valve, Re-packing, Power End, Reciprocating Plunger Pump, Positive Displacement Pumping, Triplex, and a whole lot more.

Pulp Bale Presses

Updated April, 20184 Materials

Compacting sheet pulp or loose pulp to a bale size that is optimal for shipping requires a massive hydraulic press.

Learn about: pulp and paper, Pulp bale press, and a whole lot more.

Rail Car Dumper

Updated June, 20181 Material

Learn through play about a pulp-chip rail car dumper.

Learn about: logic, Car, slip-in cartridge, Dumper, low pressure standby, Pulp and Paper, Rail, and a whole lot more.


Updated September, 20192 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

Learn about: Sawmill, Conveyor, Quadrant Feeder, Log, Belt, Hydraulic, and a whole lot more.

Truck Dumper

Updated November, 20181 Material

Step through the operational stages as a truck dumper runs in schematic form.

Learn about: Valve Solenoid Sequence Chart, Truck Dumper, and a whole lot more.

We Are Here To Help You

Find Answers at the Help Center


Toll Free (North America) 1-866-628-3224

Monday to Friday, 8am to 4pm MST
98.8% of people gave us a positive rating this month — Thanks!

Bad News

JavaScript is not enabled in your browser.

We use JavaScript to power our training media, so you'll need to turn JavaScript on before you can use LunchBox Sessions. If you need help, email us at