Session Listing

A complete list of all the subjects we cover.

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20 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: Current, Voltage, Power, Energy Conversion, Amps, Ohms, Work, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Transceiver, Standard CAN, Recessive Bit, Control Field, Confirmation Field, Acknowledge Field, Controller, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Flux, Deutsch, Male, Jack, Amphenol, Weather Pack, Plug, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: Electrical, Rectifier, Circuit, Troubleshooting, LED, Bias, Semiconductor, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: Static Dissipative Footwear, Electrical PPE, Electrically Insulated Footwear, Burn, Zero Energy, 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: Fluke Meter, Resistance Test, Measurement, Continuity Test, Test For Blown Fuse, Open Circuit, Digital Multimeter, 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: Faraday's Law of Electromagnetic Induction, , Mass Flow Measuring System, Electromagnetic Flow Meter, Mass Flow Rate, Flow, Conductive, 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: Inspecting Fuses, Circuit breaker, Testing Fuses, Blown Fuse, Fuse, Fast acting fuse, Slow blow fuse, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Bus, Electronics, Wire Crossing, Off-Page, Earth Ground, Standard, Layout, 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: Meter Reading, Ten Step Troubleshooting Process, Hydraulic Loader Fault, Troubleshooting, Electrical Fault, System Diagnosis, Open Circuit Fault, 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: Inductive, Hall, Diffuse, Thru-Beam, Retroreflective, Proximity, Magnetostrictive, 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: Manometer, Diaphragm Gauge, Indicator Fluids, psi, Pressure, Pressure Sensor, psig, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Pole, Switch, System, Throw, Electrical Circuit, Single Pole Double Throw, Troubleshooting, 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: Electrostatic Discharge, Transistor, Schematic, JFET, Troubleshooting, MOV, Metal Oxide Varistor, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Live Zero, Upper Range Value, Normalizing, Range, Sourcing, Sinking, Sensor, 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: Electrical Circuit, System Design, Branch, Series, Parallel, Industrial Maintenance, Electrician, 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, Equalizer, Electrical, Battery, Starter, 12V, Alternator, and a whole lot more.


Updated March, 202114 Materials

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

Learn about: 3 Way Switching, Push Button, Pole, Selector, Switch, Normally Open, On-Off-On, and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: Potentiometer, 2 lead, Resistance, AC temperature control, Rheostat, wiper, Variable Resistor, 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, Digital Control, Alternating Current, Electrical Current, Frequency, Hertz, AC, 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: area ratio, hydraulics, two-port slip-in cartridge valves, logic valve circuits, damping valves, poppet, 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: Adjusting a Counterbalance Valve, Motion Control, Load Holding, Safety, Counterbalance Valve, Raised Load, Runaway Load, 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: Overpressure, Flywheel Mass, Cross-Port Relief Valves, Regenerative, Braking Valves, and a whole lot more.

Electro-Hydraulic Valves

Updated June, 20208 Materials

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

Learn about: moog, electro-hydraulic valves, servo valves, proportional valves, 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: Pressure Differential, Piston Pump, Off-Stroke, Pressure, Internal Gear Pump, Wear, Volumetric Efficiency, and a whole lot more.

Flow & Directional Control Valves

Updated January, 202136 Materials

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

Learn about: Lands, Operator, Pilot, Float, Two Section Valves, Flow Paths, Three Section Valves, 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, Surface Area, Gravity, Area, Torque, Gallons Per Minute, Power, and a whole lot more.

Hydraulic Accessories

Updated May, 202112 Materials

This session covers a handful of hydraulic accessories.

Learn about: Metric Parallel, BSPP, ISO 4406, Sleeve, Thread Identification Kit, Straight Threads, Thread Gauge, and a whole lot more.

Hydraulic Actuators

Updated June, 202116 Materials

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

Learn about: Gland, Motor, Blind End, Cylinder, Troubleshooting, Tube/Barrel, TSTP, and a whole lot more.

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

Learn about: Pinch Points, Hose and Fitting Failure, Heat, Unexpected Motion, Flammability, Zero Energy State, 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: rotation, manifold line, drafting, cartridge valve, Schematic symbols, variable, detent, 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: Hand Metering Unit, hydraulic steering, power steering, orbitrol, steering valve, 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, Cavitation, Hot Oil Shuttle Valve, Reversing Flow, Pressure Compensated Pump, Hot Loop, Direct Linkage, 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: Margin Pressure, Orifice, Flow Control, Load Sensing Compensator, Load Sense, Pressure Differential, Equilibrium, 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, Sectional Valve Bank, Open Center, Closed Loop, Open Loop, Closed Center, and a whole lot more.

Parallel & Series Systems

Updated March, 202024 Materials

Parallel and Series circuits behave very differently.

Learn about: Load, Parallel Circuits, Branch, Restriction, Series Circuits, System Pressure, Pressure Drops, 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: Manual Pilot Control, Control Stick, Joysticks, Pilot Valve, Hydraulic Control, Pilot Controllers, 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: Aeration, Mechanical Erosion, Positive Pressure, Cavitation, Starved Inlet, Flooded Inlet, Partial Vacuum Pressure, 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: Hydraulic Pressure, Fluid Velocity, Flow Rate, Gauge, Hydraulic Flow, Resistance, Velocity, 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, Downstream Pressure, Pressure, Normally Closed, and a whole lot more.

Pressure Relief Valves

Updated March, 202131 Materials

Jump into relief valves with this colorful session.

Learn about: pilot, relief pressure, normally closed, normally open, setting pressure, balanced relief valve, pressure override, and a whole lot more.

Sequence Valves

Updated December, 20205 Materials

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

Learn about: Valve, Training, Set Pressure, Sub-Circuit, Hydraulic, Order, Sequence, 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, Ten Step Troubleshooting Process, TSTP, Hit or Miss, easy-to-check order, Guess and Check, 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: High-Low Circuit, Volume Pump, Pressure, Efficient, Fast Approach Slow Feed Circuit, External Pilot Section, Pressure Pump , 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: AWP, Scissor Lift Hydraulics, Aerial Work Platform, Mobile Elevated Work Platform, Slab Scissor Lift, MEWP, 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: Simulation, Drill, Atlas Copco, Blast Hole Drill, Propel, Animation, Diverter, and a whole lot more.

Cat Excavators

Updated March, 20203 Materials

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

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

Cat Haul Trucks

Updated January, 20213 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.

Cement Plants

Updated April, 20211 Material

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

Learn about: Cement Mixer, Cement, Cement Plant, Guillotine Gate, 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: Reclaimer, Mining Equipment, Coal, Stacker, Hoist Circuit, and a whole lot more.

Coiled Tubing Units

Updated January, 202120 Materials

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

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

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

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

Deere-Hitachi Excavators & Shovels

Updated April, 202022 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: EHC Valve, solenoid valves, pump regulator, heavy machinery, pump controller, Electro-hydraulic control valve, and a whole lot more.


Updated March, 20211 Material

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: D11R, Lift, Caterpillar, Hydraulics, Dozer, Cat, Tilt, 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: Caterpillar Hydraulics, Cat Grader Schematics, Steering, 24M Series, Brakes, Implements, 24H Series, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

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

Komatsu Haul Trucks

Updated July, 20208 Materials

Check this session out for a bundle of 830E and 930E Live Schematics, plus a 3D video.

Learn about: Hydraulic, Komatsu, Live Schematic, 830E, 930E, Inlet Section, Brakes, and a whole lot more.

Liebherr Haul Trucks

Updated January, 20212 Materials

Interact with and learn about Liebherr haul trucks with a few live schematics in this session.

Learn about: Hoist Circuit, Haul Truck, Simulations, Cooling Circuit, 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: Bucket, Front-End Loader, Shock Valve, Mobile Equipment Hydraulic, Boom, Loader Schematic, Auxiliary, 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, Lubricant, Simulation, Hydraulic Lube Systems, 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: piston compressor, Mobile pneumatics, air governor, 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: Cement Metering Valve, Oilfield, Dust, Dry Blending, Slurry, Cementing, Air Entrainment, 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, Suction Valve, Power End, Packing, Triplex, Maintenance, Positive Displacement Pumping, and a whole lot more.

Paper Machine Reels & Winders

Updated October, 20204 Materials

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

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

Pulp Mill Machinery

Updated April, 202110 Materials

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

Learn about: Dumper, wire drive, slip-in cartridge, Pulp and Paper, Truck Dumper, logic, pulp and paper, and a whole lot more.


Updated August, 20204 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

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

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