Session Listing

A complete list of all the subjects we cover.

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


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Confirmation Field, Control Field, CAN Bus Protocol, Dominant Bit, Network, Bus, Cyclic Redundancy Check Field, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Optical Fiber, Power, Maintenance, Coaxial, Metri-Pack, Solder Sucker, Female, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: Multimeter, Troubleshooting, Light Emitting Diodes, PNP, N-type, LED, Electrical, 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 PPE, Electrically Insulated Footwear, Electrocution, Flame Resistant, Hazards, Zero Energy, Burn, 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, DMM, Continuity Test, Digital Multimeter, Ammeter, Electrical, Fluke Meter, 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: Mass Flow Rate, Mag Flow Meter, Conductive, Density, Magnetic Field, 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: Blown Fuse, Circuit breaker, Fast acting fuse, Testing Fuses, Short Circuit, Digital Multimeter, Fuse Test, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: NEMA, Bus, Off-Page, Earth Ground, Draft, Diagram, Troubleshooting, 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, Short Circuit, Electrical Fault, Open Circuit, Troubleshooting, Skill, System Diagnosis, 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: Inductive, Capacitive, Thru-Beam, Ultrasonic, Nominal Range, Photoelectric, 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: Wheatstone Bridge, Diaphragm Gauge, psi, Strain Gauges, Piezoelectric Sensors, Manometer, Differential, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Schematic Symbol, Switch, System, Relay, Single Pole Double Throw, Electrical Circuit, Diagnostic, 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: BJT, JFET, Component, Maintenance, MOV, Transistor, FET, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Zero, Span, Transducer, PNP, NPN, Calibration, Range, 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, System Design, Troubleshooting, Kirchoff's Voltage Law, Branch, Electrical Circuit, 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, 12V, Troubleshooting, Starter, Battery, 24V, Alternator, and a whole lot more.


Updated July, 201913 Materials

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

Learn about: Normally Closed, Rating, Pole, Control, Three Way Switching, Normally Open, N.C., and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: wiper, Resistance, Potentiometer, AC temperature control, Variable Resistor, Rheostat, 2 lead, 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: Alternating Current, Root Mean Square, PWM, ECM, Pulse Width Modulation, Digital Control, Frequency, 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: logic valve circuits, relief valves, passive control, active control, valve cover plate, area ratio, 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: Runaway Load, Raised Load, Load Holding, Safety, Adjusting a Counterbalance Valve, Counterbalance Valve, Motion Control, 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: Regenerative, Overpressure, Flywheel Mass, Braking Valves, 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, electro-hydraulic valves, servo valves, moog, and a whole lot more.

Fixed & Variable Displacement Pumps

Updated June, 202032 Materials

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

Learn about: Fixed Displacement, Wear, Inlet, Gear Pump, Internal Gear Pump, Rotating Group, GPM, and a whole lot more.

Flow & Directional Control Valves

Updated July, 202033 Materials

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

Learn about: Solenoid, Directional Control Valve, DCV, Troubleshooting, Flow Paths, 2-Stage Valves, Large Volume, 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: Gallons Per Minute, Static Pressure, Surface Area, Work, Rotational Force, Linear Force, Static Pressure, and a whole lot more.

Hydraulic Accessories

Updated June, 202011 Materials

This session covers a handful of hydraulic accessories.

Learn about: Threads, Piston, Flank, Diameter, Poppet, Length, Straight Threads, and a whole lot more.

Hydraulic Actuators

Updated September, 201913 Materials

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

Learn about: TSTP, Linear Actuator, Rod, Troubleshooting, Cylinder, Motor, Semi-Rotary Actuators, and a whole lot more.

Hydraulic Hazards & Safety

Updated January, 20173 Materials

Safe working habits around hydraulic systems save lives.

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

Hydraulic Schematic Symbols

Updated August, 201910 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: drain line, spring, cartridge valve, detent, drafting, manifold line, tank, 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: steering valve, Hand Metering Unit, hydraulic steering, orbitrol, HMU, power steering, and a whole lot more.

Hydrostatic (Closed Loop) Systems

Updated July, 202017 Materials

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

Learn about: Hot Oil Shuttle Valve, Closed Loop, Reversing Flow, Heat, Servo, Hot Loop, Cavitation, and a whole lot more.

Load Sensing Pumps

Updated June, 202017 Materials

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

Learn about: Piston Pump, Hunting, Load Sense, Orifice, Margin Pressure, Load Sensing Compensator, Pressure Differential, and a whole lot more.

Open & Closed Center Systems

Updated July, 202010 Materials

This session tackles the differences and similarities between open and closed center systems.

Learn about: Closed Loop, Open Loop, Closed Center, Sectional Valve Bank, Open Center, Mobile, and a whole lot more.

Parallel & Series Systems

Updated March, 202019 Materials

Parallel and Series circuits behave very differently.

Learn about: Restriction, Parallel Circuits, Branch, Load, Pressure Drops, System Pressure, Series Circuits, 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: , and a whole lot more.

Positive & Non-Positive Pumping

Updated April, 202016 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: Air, Restriction, Mechanical Erosion, Slippage, Flooded Inlet, Partial Vacuum Pressure, Starved Inlet, and a whole lot more.

Pressure & Flow

Updated February, 202024 Materials

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

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

Pressure Relief Valves

Updated May, 202028 Materials

Jump into relief valves with this colorful session.

Learn about: pressure control valve, counterbalance valves, normally closed, direct acting relief, limit maximum system pressure, balanced relief valve, external pilot, and a whole lot more.

Sequence Valves

Updated August, 20195 Materials

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

Learn about: Hydraulic, Sub-Circuit, Order, Sequence, Valve, Pressure, Training, 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, Downtime, TSTP, Failure, Ten Step Troubleshooting Process, Hit or Miss, easy-to-check order, 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 , High-Low Circuit, Volume Pump, Fast Approach Slow Feed Circuit, Restriction, External Pilot Section, Balanced Relief Valve, and a whole lot more.

20 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: Scissor Lift Hydraulics, Mobile Elevated Work Platform, AWP, Slab Scissor Lift, 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: Propel, Diverter, Simulation, Animation, Hydraulic Circuit, Brakes, Holdback, 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: Caterpillar, Bucket Circuit, 385C, CAT, Swing Circuit, Excavator, Boom 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, Simulations, Steering Circuit, Haul Truck, 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, Stacker, Coal, Hoist Circuit, 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: Coil tubing injector, coiled tubing, injector traction, chain tension, hydraulic faults , and a whole lot more.

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

Learn about: cement, concrete, duplex plunger pump, 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: EHC Valve, heavy machinery, pump controller, Electro-hydraulic control valve, pump regulator, solenoid valves, and a whole lot more.


Updated July, 20208 Materials

Enjoy this collection of videos about Graders, such as the Caterpillar H Series and the M Series.

Learn about: , and a whole lot more.

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: regulate, engine, governor, dam, power, hydroelectric, 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, Split Spool Section, 930E, Bleeddown Manifold, Brakes, Steering, 830E, 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, Bucket, Mobile Equipment Hydraulic, Loader Schematic, Tilt, Auxiliary, Wheel Loader, 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, Hydraulic Lube Systems, Simulation, Lubricant, 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: Clumping, Air Entrainment, Cement Metering Valve, Dry Blending, Diffuser, Dust, Slurry, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Packing, Reciprocating Plunger Pump, Triplex, Positive Displacement Pumping, Discharge Valve, Re-packing, Quintuplex, and a whole lot more.

Pulp Bale Presses

Updated July, 20204 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 June, 20201 Material

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

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


Updated June, 20201 Material

Sawmills are full of specialized hydraulic and electrical equipment.

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

Truck Dumper

Updated July, 20202 Materials

Step through the operational stages as a truck dumper runs in schematic form.

Learn about: Truck Dumper, Valve Solenoid Sequence Chart, and a whole lot more.

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