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, Power, Work, Amps, Ohm's Law, Voltage, Energy Conversion, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Data Field, End Field, Cyclic Redundancy Check Field, Bus, Dominant Bit, Extended CAN, Message Identifier, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Data, Connector, Control, Coaxial, Power, Crimp, Male, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: PNP, Bias, Flyback, Electrical, Light Emitting Diodes, Rectifier, 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: , Electrocution, Zero Energy, Burn, Static Dissipative Footwear, Electrically Insulated Footwear, 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: DMM, Electrician, Fluke Meter, Open Circuit, Continuity Test, Resistance Test, 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: Conductive, Coriolis, Faraday's Law of Electromagnetic Induction, Mass Flow Measuring System, MFMS, Electrodes, Rate, 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: Electrical Circuit Protection, Digital Multimeter, Testing Fuses, Fast acting fuse, Fuse, Fuse Test, Blown Fuse, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: IES, Signal Ground, Standard, Tag, Draft, Diagram, NEMA, 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: Digital Multimeter, Open Circuit Fault, Short Circuit Fault, Electrical Fault, Short Circuit, Ten Step Troubleshooting Process, Electrician, 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: Nominal Range, Through-Beam, Sensor, Inductive, Proximity, Diffuse, Ultrasonic, 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: Differential, Vacuum, Pressure Sensor, Bar, psi, Wheatstone Bridge, psig, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

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

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Lower Range Value, PNP, Transducer, Transmitter, Calibration, Sourcing, Upper Range Value, 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, Parallel, Branch, Kirchoff's Voltage Law, Series, Troubleshooting, 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: Troubleshooting, Equalizer, Starter, Battery, 12V, Alternator, 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: On-Off-On, Double Pole, Normally Open, Normally Closed, Control, Rating, Throw, and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: wiper, Potentiometer, Variable Resistor, Resistance, Rheostat, AC temperature control, 2 lead, 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: ECM, Root Mean Square, Voltage, Direct Current, Frequency, Triangle Wave, Electrical Current, 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: valve cover plate, two-port slip-in cartridge valves, check valves, throttle valves, pressure valves, active control, area ratio, 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: Counterbalance Valve, Adjusting a Counterbalance Valve, Motion Control, Load Holding, Runaway Load, Safety, Raised 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: Flywheel Mass, Regenerative, Braking Valves, Overpressure, Cross-Port Relief 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: proportional valves, servo valves, moog, electro-hydraulic 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: Rotating Group, Inlet, Compensator, Wear, Gear Pump, Vanes, Main Gear, 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: Three Section Valves, Troubleshooting, Operator, Master-Slave Valves, Infinite Position, Center, Solenoid, 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: Litres Per Minute, Force = Pressure x Area, Heat, Force, Rotational Force, Pressure, Static Pressure, and a whole lot more.

Hydraulic Accessories

Updated May, 202112 Materials

This session covers a handful of hydraulic accessories.

Learn about: Piston, Thread Gauge, Accumulator, Metric Parallel, Filters, Material, NPTF, 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, Rotary Actuator, Tube/Barrel, Semi-Rotary Actuators, , Motor, Troubleshooting, and a whole lot more.

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

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

Hydraulic Schematic Symbols

Updated October, 202010 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: hydraulic pilot, tank, manifold line, cylinder, operator, check valve, 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: HMU, Hand Metering Unit, hydraulic steering, steering valve, orbitrol, power steering, 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: Hot Loop, Mobile, Reversing Flow, Charge Pump, Direct Linkage, Pressure Compensated Pump, Servo, 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, Pressure Differential, Hunting, Orifice, LS, Margin Pressure, Load Sense, 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, Open Center, Sectional Valve Bank, Closed Center, Open Loop, Closed Loop, and a whole lot more.

Parallel & Series Systems

Updated March, 202024 Materials

Parallel and Series circuits behave very differently.

Learn about: Pressure Drops, Path of Least Resistance, System Pressure, Branch, Restriction, Parallel Circuits, Load, 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: Control Stick, Hydraulic Control, Pilot Controllers, Joysticks, Manual Pilot Control, Pilot Valve, 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: Starved Inlet, Restriction, Cavitation, Slippage, Positive Displacement, Void Bubbles, 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: Slippage, Velocity, Flow Rate, Hydraulic Flow, Resistance, FPA Triangle, Hydraulic Pressure, 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, Direct Acting, Normally Closed, Pressure Reducing Valve, Pressure, Downstream Pressure, and a whole lot more.

Pressure Relief Valves

Updated March, 202131 Materials

Jump into relief valves with this colorful session.

Learn about: cartridge, direct acting relief, pressure control valve, normally closed, pressure spikes, pressure override, spring, and a whole lot more.

Sequence Valves

Updated December, 20205 Materials

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

Learn about: Set Pressure, Sub-Circuit, Pressure, Hydraulic, Training, Sequence, 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: TSTP, Ten Step Troubleshooting Process, Guess and Check, easy-to-check order, Hit or Miss, Downtime, Failure, 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, Energy Saving, High-Low Circuit, Pressure Pump , Balanced Relief Valve, External Pilot Section, Unloading Valve, 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: Slab Scissor Lift, AWP, Scissor Lift Hydraulics, Mobile Elevated Work Platform, MEWP, 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: Holdback, Blast Hole Drill, Animation, Drill, Hydraulic Circuit, Atlas Copco, Propel, 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: CAT, 385C, Caterpillar, Bucket Circuit, Track Drive, Swing Circuit, Excavator, 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: Haul Truck, Simulations, Hoist Circuit, 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 Plant, Cement Mixer, Cement, 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: Stacker, Mining Equipment, Hoist Circuit, Coal, Reclaimer, 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, hydraulic faults , injector traction, coiled tubing, chain tension, and a whole lot more.

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

Learn about: concrete, duplex plunger pump, cement, truck, 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: pump regulator, solenoid valves, heavy machinery, EHC Valve, 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: Tilt, Hydraulics, Dozer, Caterpillar, Cat, Lift, D11R, 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: Brakes, Implements, Cat Grader Schematics, 24H Series, Caterpillar Hydraulics, 24M Series, Steering, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: regulate, power, dam, engine, governor, generation, electricity, 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: Hoist, Komatsu, Inlet Section, 930E, Split Spool Section, Steering, Hydraulic, 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: Simulations, Hoist Circuit, Cooling Circuit, Haul Truck, 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: Steering, Mobile Equipment Hydraulic, Wheel Loader, Tilt, Front-End Loader, Lift, Boom, 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.

Mobile Equipment Air Compressors

Updated December, 20194 Materials

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

Learn about: piston compressor, air governor, Mobile pneumatics, 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: Clumping, Cement Metering Valve, Oilfield, Slurry, Cementing, Diffuser, Air Entrainment, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Power End, Triplex, Maintenance, High Pressure Pumping, Quintuplex, Positive Displacement Pumping, Suction Valve, 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: Nip Guard, Paper Machine, Roll Eject, Reeling, Winding, Calender, Cradle, 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: low pressure standby, Valve Solenoid Sequence Chart, pulp and paper, slip-in cartridge, Pulp bale press, wire drive, Dumper, and a whole lot more.


Updated August, 20204 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

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

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