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: Voltage, Watts, Current, Amps, Ohm's Law, Ohms, Resistance, and a whole lot more.


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Node, Non-Return to Zero Inverted, Data Field, Start Field, Control Field, Message Identifier, Arbitration, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Solder, Amphenol, Connector, Male, Hirschmann, Maintenance, Power, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: N-type, Electrical, P-type, Semiconductor, Light Emitting Diodes, Bias, LED, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: Electrical Safety, Flame Resistant, Electrical PPE, Electrocution, Burn, 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: Ammeter, Voltage Test, Measurement, Test For Blown Fuse, Continuity Test, Digital Multimeter, Electrical, 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, MFMS, Mag Flow Meter, Rate, Magnetic Field, Electrodes, 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, Circuit breaker, Blown Fuse, Fast acting fuse, Slow blow fuse, Inspecting Fuses, Testing Fuses, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Off-Page, Signal Ground, IES, Tag, NEMA, Earth Ground, Standard, 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, Skill, Short Circuit, Ten Step Troubleshooting Process, System Diagnosis, Open Circuit Fault, Electrician, 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: Sensor, Capacitive, Retroreflective, Diffuse, Photoelectric, Through-Beam, Thru-Beam, 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, Piezoelectric Sensors, psia, psig, Absolute Pressure, Pressure, Gauge, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Pole, Single Pole Double Throw, System, Throw, Electrical Circuit, Diagnostic, Relay, 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: Metal Oxide Varistor, BJT, MOV, Electrostatic Discharge, Semiconductor, JFET, Troubleshooting, and a whole lot more.

Sensor Basics

Updated August, 201814 Materials

Sensors are everywhere in our electrical world.

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


Updated July, 201913 Materials

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

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

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: wiper, Variable Resistor, Potentiometer, Rheostat, Resistance, 2 lead, AC temperature control, 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: Triangle Wave, Duty Cycle, Cycles Per Second, Hertz, Alternating Current, Amplitude, DC, 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: valve cover plate, pressure valves, two-port slip-in cartridge valves, hydraulics, throttle valves, passive control, damping valves, and a whole lot more.

Counterbalance Valves

Updated July, 20195 Materials

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

Learn about: Safety, Runaway Load, Load Holding, Raised Load, Adjusting a Counterbalance Valve, Counterbalance Valve, Motion Control, 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: Cross-Port Relief Valves, Flywheel Mass, Regenerative, Braking Valves, Overpressure, 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, proportional valves, servo valves, electro-hydraulic valves, and a whole lot more.

Fixed & Variable Displacement Pumps

Updated September, 201933 Materials

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

Learn about: Heat, Piston Pump, Cam Ring, Balanced Vane Pump, Pressure, Off-Stroke, Compensator, and a whole lot more.

Flow & Directional Control Valves

Updated July, 201917 Materials

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

Learn about: Port, Response, Directional Control Valve, DCV, Float, Pilot, Solenoid, 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: Static Pressure, Energy, Force = Pressure x Area, Joules Per Second, Hydraulic, Rotational Force, Gravity, and a whole lot more.

Hydraulic Accessories

Updated September, 201911 Materials

This session covers a handful of hydraulic accessories.

Learn about: ISO 4406, Piston, Bladder, Precharge, Metric Taper, Material, BSPP, and a whole lot more.

Hydraulic Actuators

Updated September, 201913 Materials

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

Learn about: Semi-Rotary Actuators, Rod End, Piston, Motor, Linear Actuator, 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, Unexpected Motion, Pinch Points, Hose and Fitting Failure, Flammability, System Adjustment Hazards, Heat, and a whole lot more.

Hydraulic Schematic Symbols

Updated August, 201910 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: spring, flow control, solenoid, ball valve, electrical line, variable, reservoir, 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: power steering, HMU, Hand Metering Unit, orbitrol, hydraulic steering, steering valve, and a whole lot more.

Hydrostatic (Closed Loop) Systems

Updated July, 201813 Materials

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

Learn about: Direct Linkage, Cavitation, Reversing Flow, Closed Loop, Hydrostatic Loop, Heat, Mobile, and a whole lot more.

Load Sensing Pumps

Updated January, 201711 Materials

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

Learn about: Load Sense, Orifice, Pressure Differential, Hunting, Equilibrium, LS, 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, Sectional Valve Bank, Open Loop, Closed Loop, Open Center, Closed Center, and a whole lot more.

Parallel & Series Systems

Updated September, 201920 Materials

Parallel and Series circuits behave very differently.

Learn about: Load, Series Circuits, System Pressure, Pressure Drops, Parallel Circuits, Branch, Restriction, 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: Net Positive Suction Head, Non Positive Displacement, Aeration, Cavitation, Air, Partial Vacuum Pressure, Charge Pump, and a whole lot more.

Pressure & Flow

Updated July, 201922 Materials

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

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

Pressure Reducing Valves

Updated February, 20195 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, Downstream Pressure, Normally Closed, and a whole lot more.

Pressure Relief Valves

Updated March, 201919 Materials

Jump into relief valves with this colorful session.

Learn about: relief pressure, relief valves, normally open, unloading valves, limit maximum system pressure, normally closed, 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: Training, Set Pressure, Valve, Sub-Circuit, Hydraulic, Order, Pressure, 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, easy-to-check order, TSTP, Ten Step Troubleshooting Process, Downtime, Hit or Miss, Failure, and a whole lot more.

Unloading Valves

Updated January, 20176 Materials

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

Learn about: Unloading Valve, Pressure, External Pilot Section, High-Low Circuit, Fast Approach Slow Feed Circuit, Efficient, Pressure Pump , 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, Blast Hole Drill, Propel, Simulation, Drill, Brakes, Hydraulic Circuit, 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: CAT, Bucket Circuit, Boom Circuit, Track Drive, 385C, Excavator, Swing Circuit, 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: Hoist Circuit, Haul Truck, Simulations, Steering 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: Hoist Circuit, Coal, Mining Equipment, Stacker, Reclaimer, and a whole lot more.

Coiled Tubing Units

Updated April, 20183 Materials

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

Learn about: injector traction, hydraulic faults , Coil tubing injector, chain tension, 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 controller, solenoid valves, pump regulator, heavy machinery, EHC Valve, Electro-hydraulic control valve, and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: generation, hydroelectric, power, regulate, engine, governor, dam, 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: Split Spool Section, Brakes, 930E, Hydraulic, Bleeddown Manifold, Steering, Live Schematic, and a whole lot more.


Updated September, 20196 Materials

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

Learn about: Lift, Tilt, Mobile Equipment Hydraulic, Loader Schematic, Auxiliary, Bucket, Shock Valve, 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.

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: Dust, Cementing, Air Entrainment, Cement Metering Valve, Clumping, Dry Blending, Slurry, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Power End, Maintenance, Quintuplex, Reciprocating Plunger Pump, Discharge Valve, Suction Valve, High Pressure Pumping, 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, logic, Dumper, low pressure standby, slip-in cartridge, Pulp and Paper, Car, and a whole lot more.


Updated April, 20181 Material

Sawmills are full of specialized hydraulic and electrical equipment.

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