Session Listing

A complete list of all the subjects we cover.

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21 Electrical Sessions

Basic Electrical Concepts

Updated May, 20214 Materials

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

Learn about: Voltage, Amps, Watts, Energy Conversion, Resistance, Power, Ohm's Law, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Message Identifier, Node, Acknowledge Field, Transceiver, Network, CAN Bus Protocol, Standard CAN, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Female, Solenoid Valve Connector, Optical Fiber, Plug, Power, Maintenance, Jack, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: LED, Flyback, Light Emitting Diodes, NPN, Semiconductor, Troubleshooting, Electrical, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: Flame Resistant, Burn, Zero Energy, Electrically Insulated Footwear, Electrocution, Hazards, , 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: DMM, Electrician, Electrical, Voltmeter, Test For Blown Fuse, Digital Multimeter, Continuity Test, 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: Magnetic Field, Faraday's Law of Electromagnetic Induction, MFMS, Conductive, Mag Flow Meter, Electrodes, Flow, 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: Circuit breaker, Fuse, Electrical Circuit Protection, Fuse Test, Fast acting fuse, Digital Multimeter, Testing Fuses, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Electrical Schematic, Diagram, Tag, Troubleshooting, Electrician, NEMA, Connection, 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, Hydraulic Loader Fault, Electrician, Meter Reading, Digital Multimeter, Short Circuit Fault, Open Circuit Fault, and a whole lot more.

Position Sensors

Updated January, 202222 Materials

Magnetic, Hall Effect, Inductive, Capacitive, Photoelectric, Magnetostrictive and Ultrasonic proximity, speed and position sensors are covered in this session.

Learn about: Ultrasonic, Diffuse, Capacitive, Hall, Thru-Beam, Photoelectric, Proximity, 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: Pressure Sensor, Piezoelectric Sensors, Vacuum, Gauge, Variable Capacitance Sensor, Wheatstone Bridge, Indicator Fluids, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: System, Troubleshooting, Electrical Circuit, Throw, Switch, Diagnostic, Single Pole Double Throw, 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: ESD, Maintenance, FET, Schematic, Semiconductor, Electronics, Transistor, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Sinking, Transmitter, Sensor, PNP, Transducer, Zero, Range, 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, Kirchoff's Voltage Law, Electrician, Troubleshooting, Electrical Circuit, KVL, Series, 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: 24V, 12V, Equalizer, Starter, Battery, Troubleshooting, Electrical, and a whole lot more.


Updated March, 202114 Materials

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

Learn about: Normally Open, Single Pole, Double Pole, N.C., Push Button, Control, 3 Way Switching, and a whole lot more.

Temperature Sensors

Updated April, 20226 Materials

At the most basic level, temperature sensors tell you something really simple: hot, or not.

Learn about: temperature measuring device, temperature, resistance temperature detector, temperature sensor, temperature basics, thermistor, rtd, and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

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

Waveforms & Signal Generation

Updated February, 20219 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: Control Voltage, Resistance, Sin Wave, DC, Frequency, Amps, Amplitude, and a whole lot more.

24 Hydraulics Sessions

Cartridge Valves

Updated July, 20205 Materials

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

Learn about: throttle valves, logic valve circuits, check valves, pressure valves, damping valves, poppet, relief valves, and a whole lot more.

Counterbalance Valves

Updated August, 202111 Materials

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

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

Cross-Port Relief Valves

Updated May, 20225 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: Flywheel Mass, Cross-Port Relief Valves, Braking Valves, Regenerative, Overpressure, and a whole lot more.

Electro-Hydraulic Valves

Updated February, 202211 Materials

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

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

Fixed & Variable Displacement Pumps

Updated May, 202235 Materials

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

Learn about: Swash Plate, LPM, Internal Gear Pump, Pressure Compensated Pump, Outlet, Variable Displacement, Vane Pump, and a whole lot more.

Flow & Directional Control Valves

Updated May, 202240 Materials

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

Learn about: Undercuts, Three Section Valves, Solenoid, DCV, Main Valve Section, Two Section Valves, Port, and a whole lot more.

Fluid Power Basics

Updated May, 20218 Materials

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

Learn about: Force = Pressure x Area, Static Pressure, Force, Litres Per Minute, Dynamic Pressure, Newtons, FPA Triangle, and a whole lot more.

Hydraulic Accessories

Updated September, 202114 Materials

This session covers a handful of hydraulic accessories.

Learn about: Crest, Minimum Bend Radius, Brackets, Bladder, Filters, ISO 4406, Poppet, and a whole lot more.

Hydraulic Actuators

Updated May, 202216 Materials

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

Learn about: Blind End, Rod End, Cylinder, Semi-Rotary Actuators, Gland, Linear Actuator, Seal, and a whole lot more.

Hydraulic Hazards & Safety

Updated May, 20223 Materials

Safe working habits around hydraulic systems save lives.

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

Hydraulic Schematic Symbols

Updated October, 202010 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: logic valve, manifold line, spring, Schematic symbols, cylinder, variable, reservoir, and a whole lot more.

Hydraulic Steering

Updated September, 20196 Materials

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

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

Hydrostatic (Closed Loop) Systems

Updated May, 202221 Materials

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

Learn about: Pressure Compensated Pump, Hydrostatic Loop, Direct Linkage, Charge Pump, Reversing Flow, Hot Loop, Closed Loop, and a whole lot more.

Load Sensing Pumps

Updated March, 202118 Materials

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

Learn about: Pressure Differential, Hunting, Piston Pump, Load Sense, LS, Orifice, Margin Pressure, and a whole lot more.

Open & Closed Center Systems

Updated July, 202013 Materials

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

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

Parallel & Series Systems

Updated March, 202024 Materials

Parallel and Series circuits behave very differently.

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

Pilot Controllers

Updated April, 20203 Materials

Whether you're using a joystick to raise or swing a boom, or floor pedals for forward or reverse track motion, you're interacting with a pilot controller.

Learn about: Pilot Valve, Control Stick, Manual Pilot Control, Joysticks, Pilot Controllers, Hydraulic Control, and a whole lot more.

Positive & Non-Positive Pumping

Updated May, 202220 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: Positive Pressure, Positive Displacement, Non Positive Displacement, Breather, Starved Inlet, Charge Pump, Mechanical Erosion, and a whole lot more.

Pressure & Flow

Updated May, 202228 Materials

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

Learn about: Resistance, Velocity, Slippage, Positive Displacement Pump, Fluid Velocity, Hydraulic Pressure, FPA Triangle, and a whole lot more.

Pressure Reducing Valves

Updated June, 20207 Materials

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

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

Pressure Relief Valves

Updated March, 202131 Materials

Jump into relief valves with this colorful session.

Learn about: spool, limit maximum system pressure, pressure spikes, cartridge, relief valves, pilot, balanced relief valve, and a whole lot more.

Sequence Valves

Updated December, 20205 Materials

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

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

Troubleshooting Processes

Updated January, 20177 Materials

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

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

Unloading Valves

Updated May, 20227 Materials

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

Learn about: Pressure, Fast Approach Slow Feed Circuit, High-Low Circuit, Energy Saving, Unloading Valve, Efficient, Volume Pump, and a whole lot more.

22 Machinery Sessions

Aerial Work Platforms

Updated January, 20222 Materials

The world of the aerial work platform (AWP) or the mobile elevated work platform (MEWP) includes a group of machines that are very popular in construction and building maintenance.

Learn about: AWP, MEWP, Scissor Lift Hydraulics, Slab Scissor Lift, Mobile Elevated Work Platform, Aerial Work Platform, and a whole lot more.

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: Blast Hole Drill, Simulation, Animation, Brakes, Diverter, Drill, Holdback, and a whole lot more.

Cement Plants

Updated August, 20212 Materials

In this session you can learn about the inner workings for the hydraulics of a cement plant.

Learn about: Cement Plant, Cement Mixer, Guillotine Gate, Cement, and a whole lot more.

Civic Machines

Updated October, 20212 Materials

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Learn about: , and a whole lot more.

Coiled Tubing Units

Updated October, 202121 Materials

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

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

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

Learn about: cement, concrete, duplex plunger pump, truck, and a whole lot more.


Updated August, 20215 Materials

Explore a dozer in this session with one of our Live Schematic simulations, featuring a side-by-side view of the schematic and a cutaway graphic.

Learn about: Lift, Dozer, Caterpillar, Cat, D11R, Hydraulics, Tilt, and a whole lot more.

Excavators & Shovels

Updated June, 202126 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: Track Drive, Excavator, pump regulator, Electro-hydraulic control valve, Caterpillar, Swing Circuit, CAT, and a whole lot more.


Updated December, 202013 Materials

Enjoy this collection of videos and simulations about Graders, such as the Caterpillar H Series and the M Series.

Learn about: Cat Grader Schematics, Brakes, Steering, Implements, 24H Series, 24M Series, Caterpillar Hydraulics, and a whole lot more.

Hydraulic Governors

Updated January, 20223 Materials

The governor is a critical component in hydroelectric dams.

Learn about: generation, hydroelectric, electricity, regulate, hydraulic, power, governor, and a whole lot more.


Updated February, 20209 Materials

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

Learn about: Tilt, Steering, Bucket, Wheel Loader, Auxiliary, Boom, Front-End Loader, 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: Bearings, Hydraulic Lube Systems, Simulation, Lubricant, and a whole lot more.

Mining Haul Trucks

Updated March, 202215 Materials

Haul trucks from three major manufacturers are covered in this session.

Learn about: Komatsu, Liebherr, Live Schematic Simulation, Caterpillar, 3D Video, and a whole lot more.

Mobile Equipment Air Compressors

Updated December, 20194 Materials

This session is an introduction to some mobile pneumatic system basics.

Learn about: air governor, Mobile pneumatics, piston compressor, 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: Slurry, Dry Blending, Diffuser, Cement Metering Valve, Mixing Head, Dust, Cementing, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Reciprocating Plunger Pump, High Pressure Pumping, Discharge Valve, Maintenance, Quintuplex, Triplex, Positive Displacement Pumping, and a whole lot more.

Oriented Strand Board

Updated May, 20226 Materials

An oriented strand board (OSB) mill produces a structural panel from strands cut primarily from small diameter aspen or poplar logs.

Learn about: , and a whole lot more.

Paper Mill

Updated October, 202114 Materials

Paper machines depend on hydraulic systems for precise forces, fast motions, and careful load handling.

Learn about: Roll Eject, Winding, Calender, Paper Machine, Cradle, Reeling, Nip Guard, and a whole lot more.

Ports & Terminals

Updated February, 20224 Materials

In this session, you'll see the boom hoisting circuit of a coal stacker/reclaimer come to life in a Live Schematic.

Learn about: , and a whole lot more.

Pulp Mill

Updated March, 202214 Materials

A pulp mill has the equivalent horsepower of a dozen freight trains of machinery running inside.

Learn about: Dumper, slip-in cartridge, Valve Solenoid Sequence Chart, wire drive, low pressure standby, pulp and paper, Truck Dumper, and a whole lot more.


Updated August, 20204 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

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

Steel Mill

Updated November, 20212 Materials

Smelting, casting and rolling are a few of the processes that may be found in a steel mill.

Learn about: casting, steel, cooling, and a whole lot more.

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