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: Ohms, Watts, Voltage, Power, Resistance, Current, Work, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Message Frame, Standard CAN, Arbitration, CAN-H, Message Identifier, Acknowledge Field, Control Field, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Female, Metri-Pack, Screw, Wick, Jack, Amphenol, Flux, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: LED, Semiconductor, Electrical, Circuit, Troubleshooting, P-type, N-type, 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, Electrocution, Electrical PPE, Burn, Electrical Safety, Hazards, Electrically Insulated Footwear, 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: Measurement, Electrician, Short Circuit, Fluke Meter, Voltmeter, Open Circuit, Ammeter, 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: Rate, MFMS, Mag Flow Meter, , Magnetic Field, Coriolis, Electrodes, 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: Testing Fuses, Inspecting Fuses, Digital Multimeter, Fast acting fuse, Fuse, Short Circuit, Slow blow fuse, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Chassis Ground, IES, Electrician, Tag, NEMA, Standard, 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: Troubleshooting, Hydraulic Loader Fault, Electrical Fault, Electrician, Open Circuit Fault, Digital Multimeter, Meter Reading, and a whole lot more.

Position Sensors

Updated May, 202114 Materials

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

Learn about: Sensor, Magnetostrictive, Diffuse, Photoelectric, Magnetic, Capacitive, Hall, 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: Wheatstone Bridge, Vacuum, Gauge, Pascal, Differential, Bar, Indicator Fluids, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

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

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Sourcing, Transmitter, Lower Range Value, PNP, Sensor, Range, Live Zero, 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: Industrial Maintenance, Series, Electrical Circuit, Kirchoff's Voltage Law, Branch, Troubleshooting, Parallel, 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: Battery, Starter, 12V, 24V, Alternator, Electrical, Troubleshooting, and a whole lot more.


Updated March, 202114 Materials

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

Learn about: Control, Single Pole, N.O., Three Way Switching, Rating, On-Off-On, N.C., and a whole lot more.

Temperature Sensors

Updated September, 20213 Materials

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

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

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: wiper, Resistance, AC temperature control, Variable Resistor, 2 lead, Potentiometer, Rheostat, 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: Electrical Current, AC, Hz, Frequency, Analog Control, Amplitude, Root Mean Square, 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: active control, valve cover plate, damping valves, hydraulics, area ratio, logic valve circuits, poppet, 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: Counterbalance Valve, Motion Control, Runaway Load, Safety, Load Holding, Raised Load, Adjusting a Counterbalance Valve, and a whole lot more.

Cross-Port Relief Valves

Updated February, 20205 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, Regenerative, Overpressure, Cross-Port Relief Valves, Braking Valves, and a whole lot more.

Electro-Hydraulic Valves

Updated November, 20219 Materials

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

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

Fixed & Variable Displacement Pumps

Updated February, 202135 Materials

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

Learn about: Vane Pump, Vanes, Rotating Group, GPM, Variable Displacement, Balanced Vane Pump, Heat, and a whole lot more.

Flow & Directional Control Valves

Updated September, 202136 Materials

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

Learn about: Master-Slave Valves, Port, Tandem, Pilot, Infinite Position, Lands, Response, 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: lpm, Newtons, Viscosity, Force Multiplication, Fluidic Principles, Torque, gpm, and a whole lot more.

Hydraulic Accessories

Updated September, 202114 Materials

This session covers a handful of hydraulic accessories.

Learn about: Root, NPTF, Hydraulic Hose Pressure Rating, Screw Pitch, Hydro-Pneumatic Accumulator, Calipers, Filters, and a whole lot more.

Hydraulic Actuators

Updated June, 202116 Materials

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

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

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

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

Hydraulic Schematic Symbols

Updated October, 202010 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: spring, cylinder, ball valve, cartridge valve, shuttle valve, hydraulic pilot, accumulator, 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: orbitrol, power steering, hydraulic steering, steering valve, Hand Metering Unit, HMU, and a whole lot more.

Hydrostatic (Closed Loop) Systems

Updated June, 202119 Materials

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

Learn about: Heat, Direct Linkage, Hydrostatic Loop, Cross Port Relief, Charge Pump, Hot Loop, Pressure Compensated Pump, 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: Load Sensing Compensator, Margin Pressure, Load Sense, Hunting, Orifice, Piston Pump, LS, 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: Closed Center, Mobile, Open Loop, Closed Loop, Open Center, Sectional Valve Bank, and a whole lot more.

Parallel & Series Systems

Updated March, 202024 Materials

Parallel and Series circuits behave very differently.

Learn about: Pressure Drops, Parallel Circuits, Load, Path of Least Resistance, System Pressure, Branch, Restriction, 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: Hydraulic Control, Joysticks, Manual Pilot Control, Pilot Controllers, Pilot Valve, Control Stick, and a whole lot more.

Positive & Non-Positive Pumping

Updated August, 202020 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: Charge Pump, Flooded Inlet, Restriction, Void Bubbles, Net Positive Suction Head, Mechanical Erosion, Starved Inlet, and a whole lot more.

Pressure & Flow

Updated February, 202028 Materials

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

Learn about: FPA Triangle, Flow Rate, Hydraulic Flow, Fluid Velocity, Velocity, Slippage, Positive Displacement Pump, 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: Pilot Operated, Pressure, Pressure Reducing Valve, Downstream Pressure, Normally Closed, Direct Acting, and a whole lot more.

Pressure Relief Valves

Updated March, 202131 Materials

Jump into relief valves with this colorful session.

Learn about: cracking pressure, relief pressure, setting pressure, spring, pressure override, normally open, pressure control 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, Training, Sub-Circuit, Valve, Order, Set Pressure, Hydraulic, and a whole lot more.

Troubleshooting Processes

Updated January, 20177 Materials

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

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

Unloading Valves

Updated January, 20207 Materials

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

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

22 Machinery Sessions

Aerial Work Platforms

Updated April, 20201 Material

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: Aerial Work Platform, MEWP, AWP, Slab Scissor Lift, Mobile Elevated Work Platform, Scissor Lift Hydraulics, 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: Atlas Copco, Hydraulic Circuit, Brakes, Simulation, Blast Hole Drill, Propel, Diverter, 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 Mixer, Cement, Guillotine Gate, Cement Plant, and a whole lot more.

Civic Machines

Updated October, 20212 Materials

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Learn about: , and a whole lot more.

Coal Stacker-Reclaimer

Updated July, 20202 Materials

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

Learn about: Stacker, Hoist Circuit, Reclaimer, Mining Equipment, Coal, 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: Coil tubing injector, chain tension, coiled tubing, injector traction, hydraulic faults , and a whole lot more.

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

Learn about: truck, duplex plunger pump, concrete, cement, 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: Cat, Tilt, Caterpillar, Lift, Dozer, D11R, Hydraulics, 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: Electro-hydraulic control valve, Track Drive, heavy machinery, Swing Circuit, solenoid valves, pump controller, EHC Valve, 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: Implements, Cat Grader Schematics, 24M Series, Steering, 24H Series, Caterpillar Hydraulics, Brakes, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: electricity, dam, governor, hydroelectric, engine, regulate, generation, 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: Loader Schematic, Front-End Loader, Lift, Wheel Loader, Boom, Steering, Tilt, 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: Hydraulic Lube Systems, Bearings, Simulation, Lubricant, and a whole lot more.

Mining Haul Trucks

Updated July, 202114 Materials

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

Learn about: Live Schematic Simulation, Caterpillar, Liebherr, 3D Video, Komatsu, 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: Diffuser, Oilfield, Slurry, Dry Blending, Cementing, Clumping, Dust, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Triplex, Packing, Maintenance, Quintuplex, Power End, Fluid End, High Pressure Pumping, and a whole lot more.

Oriented Strand Board

Updated November, 20212 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: Nip Guard, Roll Eject, Cradle, Paper Machine, Winding, Reeling, Calender, and a whole lot more.

Pulp Mill

Updated October, 202112 Materials

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

Learn about: Rail, Pulp and Paper, Pulp bale press, Valve Solenoid Sequence Chart, pulp and paper, Car, logic, and a whole lot more.


Updated August, 20204 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

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

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