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


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Node, Terminal, Control Field, Extended CAN, Data Field, Dominant Bit, Bus, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Coaxial, Data, Weather Pack, Female, Wick, Metri-Pack, Hirschmann, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: Light Emitting Diodes, Rectifier, P-type, Multimeter, Flyback, PNP, Circuit, 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, Static Dissipative Footwear, Burn, Zero Energy, Electrically Insulated Footwear, 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: Voltmeter, Measurement, Resistance Test, Digital Multimeter, Voltage Test, Short Circuit, Electrician, 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: Mag Flow Meter, MFMS, Rate, Mass Flow Measuring System, Density, Faraday's Law of Electromagnetic Induction, 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: Short Circuit, Fuse Test, Digital Multimeter, Inspecting Fuses, 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: Symbol, Wire Crossing, NEMA, Electrical Schematic, Layout, Earth Ground, Draft, 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: System Diagnosis, Electrical Fault, Electrician, Short Circuit, Meter Reading, Open Circuit, Open Circuit Fault, 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: Diffuse, Nominal Range, Sensor, Thru-Beam, Photoelectric, Capacitive, Retroreflective, 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: psia, Gauge Pressure, Manometer, Pressure Sensor, Differential, Strain Gauges, Bar, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Diagnostic, Relay, Switch, Pole, System, Electrical Circuit, 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: Component, Electrical, BJT, Troubleshooting, Electronics, MOV, Metal Oxide Varistor, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Calibration, Zero, PNP, Sourcing, Live Zero, Span, NPN, 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: Parallel, Electrician, KVL, Kirchoff's Voltage Law, Electrical Circuit, Series, System Design, 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: Equalizer, Starter, 12V, Troubleshooting, 24V, Alternator, Battery, and a whole lot more.


Updated July, 201913 Materials

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

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

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: Variable Resistor, AC temperature control, Rheostat, wiper, 2 lead, Resistance, Potentiometer, 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: Amps, DC, Direct Current, Alternating Current, Sin Wave, Frequency, Root Mean Square, 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: damping valves, poppet, hydraulics, area ratio, passive control, relief valves, pressure 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, Counterbalance Valve, Raised Load, Safety, Load Holding, Runaway Load, 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: Overpressure, Flywheel Mass, Braking Valves, Cross-Port Relief Valves, Regenerative, and a whole lot more.

Electro-Hydraulic Valves

Updated April, 20196 Materials

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

Learn about: moog, electro-hydraulic valves, proportional valves, servo valves, 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: GPM, Crescent Seal Pump, Vane Pump, Vanes, Volumetric Efficiency, Unbalanced Vane Pump, Main Gear, 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: Master-Slave Valves, Response, Troubleshooting, Spool, Center, TSTP, Main Valve Section, 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: Turbulent Flow, Force Multiplication, Rotational Force, Flow, Linear Force, Pressure, Litres Per Minute, and a whole lot more.

Hydraulic Accessories

Updated September, 201911 Materials

This session covers a handful of hydraulic accessories.

Learn about: Fittings, Sleeve, Metric Taper, Filters, Crest, Thread Profile, Material, 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, Gland, Rod End, Rod, , Cylinder, TSTP, and a whole lot more.

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

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

Hydraulic Schematic Symbols

Updated August, 201910 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: cartridge valve, tank, check valve, rotation, cylinder, electrical line, detent, 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: orbitrol, hydraulic steering, Hand Metering Unit, HMU, steering valve, power steering, 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: Cross Port Relief, Charge Pump, Closed Loop, Heat, Servo, Reversing Flow, Direct Linkage, 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: Load Sense, Equilibrium, Piston Pump, Orifice, Hunting, Pressure Differential, Flow Control, 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: Mobile, Closed Loop, Sectional Valve Bank, Closed Center, Open Loop, Open Center, and a whole lot more.

Parallel & Series Systems

Updated September, 201920 Materials

Parallel and Series circuits behave very differently.

Learn about: Load, Restriction, System Pressure, Branch, Pressure Drops, Series Circuits, Path of Least Resistance, 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: Charge Pump, Positive Displacement, Slippage, Restriction, Cavitation, Non Positive Displacement, Starved Inlet, 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: Hydraulic Pressure, Flow Rate, Hydraulic Flow, Positive Displacement Pump, Resistance, Gauge, Fluid Velocity, 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, Direct Acting, Pressure Reducing Valve, Pilot Operated, Normally Closed, Downstream Pressure, and a whole lot more.

Pressure Relief Valves

Updated September, 201927 Materials

Jump into relief valves with this colorful session.

Learn about: direct acting relief, counterbalance valves, sequence valves, balanced relief valve, cracking pressure, poppet, spool, and a whole lot more.

Sequence Valves

Updated August, 20195 Materials

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

Learn about: Sub-Circuit, Pressure, Valve, Set Pressure, Sequence, Order, 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: Downtime, Failure, Hit or Miss, TSTP, Ten Step Troubleshooting Process, Guess and Check, easy-to-check order, 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: Pressure Pump , Energy Saving, High-Low Circuit, External Pilot Section, Fast Approach Slow Feed Circuit, Unloading Valve, Pressure, 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, Hydraulic Circuit, Blast Hole Drill, Drill, Propel, Diverter, 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, Swing Circuit, Excavator, 385C, CAT, Boom Circuit, Caterpillar, 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: Haul Truck, Steering Circuit, Simulations, Hoist 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: Reclaimer, Coal, Hoist Circuit, Stacker, Mining Equipment, 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: chain tension, Coil tubing injector, injector traction, hydraulic faults , coiled tubing, 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: pump regulator, Electro-hydraulic control valve, heavy machinery, solenoid valves, EHC Valve, pump controller, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: hydraulic, generation, electricity, governor, regulate, dam, engine, 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: Live Schematic, Brakes, Bleeddown Manifold, Steering, Hydraulic, Inlet Section, 830E, 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: Front-End Loader, Bucket, Loader Schematic, Boom, Shock Valve, Wheel Loader, Lift, 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, Lubricant, Hydraulic Lube Systems, 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: Diffuser, Mixing Head, Cementing, Slurry, Air Entrainment, Clumping, Cement Metering Valve, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Triplex, Discharge Valve, Reciprocating Plunger Pump, Quintuplex, Suction Valve, Power End, Fluid End, 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 May, 20181 Material

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

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


Updated September, 20192 Materials

Sawmills are full of specialized hydraulic and electrical equipment.

Learn about: Log, Hydraulic, Conveyor, Sawmill, Quadrant Feeder, Belt, 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.

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