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


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Start Field, Standard CAN, Transceiver, Non-Return to Zero Inverted, Confirmation Field, Terminal, Acknowledge Field, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Deutsch, Connector, Power, Pin/Plug, Jack, Hirschmann, Plug, and a whole lot more.


Updated July, 20195 Materials

Learn to use your multimeter to test a diode.

Learn about: LED, Semiconductor, Flyback, Rectifier, P-type, Electrical, Troubleshooting, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: , Electrically Insulated Footwear, Electrical Safety, Zero Energy, Static Dissipative Footwear, Electrical PPE, 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, Ammeter, Measurement, Open Circuit, Resistance Test, Short 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: MFMS, Mass Flow Rate, Mag Flow Meter, Rate, Electromagnetic Flow Meter, Faraday's Law of Electromagnetic Induction, Coriolis, 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: Fuse, Testing Fuses, Short Circuit, Slow blow fuse, Fast acting fuse, Inspecting Fuses, Fuse Test, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Electronics, Wire Crossing, Troubleshooting, Earth Ground, Symbol, Electrician, Off-Page, 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, Electrician, Digital Multimeter, System Diagnosis, Short 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: Inductive, Proximity, Diffuse, Capacitive, Ultrasonic, Nominal Range, Sensor, 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, Strain Gauges, Bourdon Tube Gauge, Diaphragm Gauge, Gauge, psig, psi, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Pole, Switch, Diagnostic, Single Pole Double Throw, System, Troubleshooting, Schematic Symbol, 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: FET, Schematic, Maintenance, Electronics, Transistor, JFET, Component, and a whole lot more.

Sensor Basics

Updated October, 201915 Materials

Sensors are everywhere in our electrical world.

Learn about: Range, NPN, Transmitter, Sinking, Live Zero, Zero, Normalizing, 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, KVL, Branch, Kirchoff's Voltage Law, Electrician, Parallel, 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: 12V, Equalizer, 24V, Battery, Troubleshooting, Electrical, 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: On-Off-On, Throw, Normally Open, Normally Closed, 3 Way Switching, Control, Switch, and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: Potentiometer, Resistance, 2 lead, Rheostat, Variable Resistor, wiper, 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, Control Voltage, Frequency, Voltage, Hz, Electrical Current, Volts, and a whole lot more.

24 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: active control, two-port slip-in cartridge valves, valve cover plate, pressure valves, logic valve circuits, area ratio, passive control, 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: Load Holding, Raised Load, Counterbalance Valve, Safety, Adjusting a Counterbalance Valve, Runaway Load, 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: Cross-Port Relief Valves, Regenerative, Braking Valves, Flywheel Mass, Overpressure, and a whole lot more.

Electro-Hydraulic Valves

Updated June, 20208 Materials

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

Learn about: electro-hydraulic valves, proportional valves, moog, servo valves, 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: Variable Displacement, Unbalanced Vane Pump, Inlet, Main Gear, Internal Gear Pump, External Gear Pump, Gear Pump, and a whole lot more.

Flow & Directional Control Valves

Updated March, 202033 Materials

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

Learn about: Choke, Center, Troubleshooting, Pilot, Directional Control Valve, Open, Undercuts, 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: Fluidic Principles, Litres Per Minute, Torque, Static Pressure, Flow Viscosity, Newtons, Linear Force, and a whole lot more.

Hydraulic Accessories

Updated June, 202011 Materials

This session covers a handful of hydraulic accessories.

Learn about: ISO 4406, International, Precharge, Dynamic Threads, Poppet, Diameter, NPTF, and a whole lot more.

Hydraulic Actuators

Updated September, 201913 Materials

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

Learn about: Seal, Linear Actuator, , Motor, Rod, Blind End, 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: Zero Energy State, Hose and Fitting Failure, Heat, Flammability, System Adjustment Hazards, Pinch Points, Unexpected Motion, and a whole lot more.

Hydraulic Schematic Symbols

Updated August, 201910 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: electrical line, drain line, logic valve, operator, cylinder, variable, drafting, 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: orbitrol, HMU, power steering, steering valve, hydraulic steering, Hand Metering Unit, and a whole lot more.

Hydrostatic (Closed Loop) Systems

Updated June, 202017 Materials

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

Learn about: Servo, Cavitation, Mobile, Pressure Compensated Pump, Heat, Closed Loop, Hot Loop, 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: Margin Pressure, Equilibrium, Piston Pump, Load Sense, Pressure Differential, LS, Orifice, and a whole lot more.

Open & Closed Center Systems

Updated May, 202010 Materials

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

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

Parallel & Series Systems

Updated March, 202019 Materials

Parallel and Series circuits behave very differently.

Learn about: System Pressure, Series Circuits, Load, Restriction, Parallel Circuits, Pressure Drops, Branch, 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, Breather, Non Positive Displacement, Mechanical Erosion, Slippage, Charge Pump, Aeration, 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: Positive Displacement Pump, Hydraulic Flow, Velocity, Resistance, Slippage, FPA Triangle, 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: Direct Acting, Downstream Pressure, Normally Closed, Pressure Reducing Valve, Pressure, Pilot Operated, and a whole lot more.

Pressure Relief Valves

Updated May, 202028 Materials

Jump into relief valves with this colorful session.

Learn about: limit maximum system pressure, relief pressure, unloading valves, balanced relief valve, direct acting relief, counterbalance valves, cartridge, 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, Valve, Sequence, Hydraulic, Order, Set Pressure, 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: Hit or Miss, easy-to-check order, Guess and Check, Downtime, TSTP, Failure, Ten Step Troubleshooting Process, 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: Balanced Relief Valve, Unloading Valve, High-Low Circuit, External Pilot Section, Fast Approach Slow Feed Circuit, Volume Pump, Restriction, 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, MEWP, AWP, Aerial Work Platform, Slab Scissor Lift, Mobile Elevated 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: Diverter, Blast Hole Drill, Hydraulic Circuit, Brakes, Atlas Copco, Holdback, Simulation, 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: Bucket Circuit, Boom Circuit, CAT, Track Drive, 385C, Swing Circuit, Excavator, 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, Hoist Circuit, Simulations, Steering Circuit, 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, Mining Equipment, Coal, Hoist Circuit, 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: hydraulic faults , coiled tubing, Coil tubing injector, chain tension, injector traction, and a whole lot more.

Concrete Pump

Updated November, 20194 Materials

This session is all about truck-mounted concrete pumps.

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


Updated June, 20206 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: generation, dam, governor, electricity, regulate, hydraulic, hydroelectric, and a whole lot more.

Komatsu Haul Trucks

Updated May, 20208 Materials

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

Learn about: Inlet Section, 830E, Hydraulic, Split Spool Section, Hoist, Bleeddown Manifold, Live Schematic, 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: Lift, Boom, Loader Schematic, Wheel Loader, Auxiliary, Steering, Bucket, 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, Lubricant, Bearings, Simulation, 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: Mobile pneumatics, air governor, piston compressor, 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: Cementing, Slurry, Cement Metering Valve, Oilfield, Diffuser, Mixing Head, Dry Blending, and a whole lot more.

Oilfield Pumping

Updated June, 20186 Materials

Reciprocating plunger pumps are very common in oilfield pumping.

Learn about: Re-packing, Fluid End, Suction Valve, Packing, Discharge Valve, Positive Displacement Pumping, Power End, 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: Rail, slip-in cartridge, Pulp and Paper, logic, Dumper, Car, low pressure standby, and a whole lot more.


Updated June, 20201 Material

Sawmills are full of specialized hydraulic and electrical equipment.

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