Session Listing

Here is a complete list of all the subjects we cover.

20 Electrical Sessions

Basic Electrical Concepts

Updated January, 20174 Materials

When studying electrical circuits, you need to start with the fundamentals: Voltage, Current, and Resistance.

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


Updated December, 20185 Materials

Ready to learn about the CAN Bus Protocol.

Learn about: Non-Return to Zero Inverted, Transceiver, NRZI, Confirmation Field, Dominant Bit, CAN-L, Check Field, and a whole lot more.


Updated January, 20174 Materials

Welcome to the session on electrical connectors.

Learn about: Hirschmann, Optical Fiber, Solder Joint, Solenoid Valve Connector, Connector, Wick, Deutsch, and a whole lot more.


Updated August, 20184 Materials

Learn to use your multimeter to test a diode.

Learn about: Circuit, Bias, NPN, PNP, Troubleshooting, LED, Rectifier, and a whole lot more.

Electrical Hazards & Safety

Updated March, 20183 Materials

Even low voltage systems can seriously injure or even kill.

Learn about: Burn, Electrically Insulated Footwear, Electrical Safety, Zero Energy, Electrical PPE, Hazards, Electrocution, 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: Open Circuit, Test For Blown Fuse, Resistance Test, Electrician, Continuity Test, Ammeter, Voltmeter, 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, Magnetic Field, Mass Flow Measuring System, MFMS, Mass Flow Rate, Mag Flow Meter, Flow, 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 Test, Short Circuit, Electrical Circuit Protection, Fuse, Digital Multimeter, Slow blow fuse, Fast acting fuse, and a whole lot more.

Interpreting Electrical Schematics

Updated January, 20174 Materials

Schematics don't need to be confusing.

Learn about: Schematic, Chassis Ground, Tag, Connection, Electrical Schematic, Bus, Diagram, and a whole lot more.

Open & Short Circuit Faults

Updated January, 20176 Materials

In this session, you'll apply electrical principles to troubleshooting.

Learn about: Digital Multimeter, Short Circuit Fault, Ten Step Troubleshooting Process, Short Circuit, System Diagnosis, Hydraulic Loader Fault, Skill, 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: Proximity, Thru-Beam, Ultrasonic, Photoelectric, Retroreflective, Capacitive, Nominal Range, 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: psig, Absolute Pressure, psi, Wheatstone Bridge, Piezoelectric Sensors, Variable Capacitance Sensor, Pascal, and a whole lot more.


Updated September, 20187 Materials

Relays are demystified in this interactive lesson.

Learn about: Throw, Electrical Circuit, Troubleshooting, Single Pole Double Throw, System, Diagnostic, 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: BJT, MOV, Component, FET, ESD, Metal Oxide Varistor, Electronics, and a whole lot more.

Sensor Basics

Updated August, 201814 Materials

Sensors are everywhere in our electrical world.

Learn about: Lower Range Value, Live Zero, Sourcing, Sensor, PNP, Sinking, Calibration, and a whole lot more.

Series & Parallel Circuit Basics

Updated January, 20198 Materials

Series and parallel circuits are at the heart of every electrical system.

Learn about: Branch, Kirchoff's Voltage Law, Electrical Circuit, Electrician, KVL, Industrial Maintenance, Troubleshooting, 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, Electrical, 24V, Battery, Equalizer, Troubleshooting, Alternator, and a whole lot more.


Updated January, 201712 Materials

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

Learn about: Control, Normally Closed, Normally Open, Push Button, Pole, Switch, N.O., and a whole lot more.

Variable Resistors

Updated January, 20175 Materials

Potentiometers vs.

Learn about: wiper, AC temperature control, Resistance, 2 lead, Rheostat, Variable Resistor, 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: Hertz, DC, Volts, PWM, Triangle Wave, Control Voltage, Electrical Current, 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: relief valves, area ratio, damping valves, hydraulics, throttle valves, passive control, poppet, and a whole lot more.

Counterbalance Valves

Updated January, 20175 Materials

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

Learn about: Counterbalance Valve, Safety, Motion Control, Raised Load, Runaway Load, Load Holding, Adjusting a Counterbalance Valve, 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, Regenerative, Flywheel Mass, Braking Valves, Overpressure, and a whole lot more.

Electro-Hydraulic Valves

Updated July, 20185 Materials

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

Learn about: electro-hydraulic valves, servo valves, moog, proportional valves, and a whole lot more.

Fixed & Variable Displacement Pumps

Updated June, 201825 Materials

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

Learn about: Driven Gear, Off-Stroke, Rotor, On-Stroke, Cam Ring, Volumetric Efficiency, Unbalanced Vane Pump, and a whole lot more.

Flow & Directional Control Valves

Updated October, 201818 Materials

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

Learn about: Master-Slave Valves, Lands, Open, 2-Stage Valves, Pilot, Undercuts, Spool, 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: Surface Area, Turbulent Flow, Energy, Static Pressure, Laminar Flow, Watts, Force = Pressure x Area, and a whole lot more.

Hydraulic Accessories

Updated July, 201810 Materials

This session covers a handful of hydraulic accessories.

Learn about: Material, ISO 4406, Metric Parallel, Thread Profile, International, Diameter, Minimum Bend Radius, and a whole lot more.

Hydraulic Actuators

Updated July, 201810 Materials

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

Learn about: Tube/Barrel, Linear Actuator, , Rod, TSTP, Motor, Rod End, 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, System Adjustment Hazards, Pinch Points, Heat, Safety, Unexpected Motion, and a whole lot more.

Hydraulic Schematic Symbols

Updated January, 20177 Materials

Schematic symbol reading is a vital troubleshooting skill.

Learn about: tank, hydraulic pilot, adjustable, reservoir, accumulator, operator, pilot line, and a whole lot more.

Hydraulic Steering

Updated January, 20186 Materials

This session will go into detail on hydraulic power steering and how it works.

Learn about: orbitrol, steering valve, hydraulic steering, HMU, Hand Metering Unit, power steering, 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: Pressure Compensated Pump, Closed Loop, Direct Linkage, Cavitation, Hot Loop, Mobile, Servo, 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: LS, Equilibrium, Hunting, Orifice, Load Sensing Compensator, Load Sense, Margin Pressure, and a whole lot more.

Open & Closed Center Systems

Updated January, 201710 Materials

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

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

Parallel & Series Systems

Updated January, 201716 Materials

Parallel and Series circuits behave very differently.

Learn about: Branch, Series Circuits, Pressure Drops, Load, Restriction, System Pressure, 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: Mechanical Erosion, Starved Inlet, Flooded Inlet, Breather, Net Positive Suction Head, Positive Pressure, Non Positive Displacement, and a whole lot more.

Pressure & Flow

Updated October, 201817 Materials

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

Learn about: Velocity, Resistance, Hydraulic Flow, Hydraulic Pressure, Fluid Velocity, Gauge, Positive Displacement Pump, and a whole lot more.

Pressure Reducing Valves

Updated January, 20175 Materials

Pressure reducing valves function very differently than relief valves, even though their schematic symbols look very similar.

Learn about: Normally Closed, Pressure, Pressure Reducing Valve, Downstream Pressure, Direct Acting, Pilot Operated, and a whole lot more.

Pressure Relief Valves

Updated January, 201719 Materials

Jump into relief valves with this colorful session.

Learn about: poppet, relief valves, relief pressure, pressure override, external pilot, cartridge, normally open, and a whole lot more.

Sequence Valves

Updated January, 20175 Materials

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

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

15 Machinery Sessions

Blast Hole Drills

Updated August, 20183 Materials

This session gets you right into the hydraulic circuit sections in a common blast hole drill.

Learn about: Blast Hole Drill, Brakes, Hydraulic Circuit, Propel, Holdback, Simulation, Animation, and a whole lot more.

Cat Excavators

Updated September, 20183 Materials

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Learn about: , and a whole lot more.

Cat Haul Trucks

Updated October, 20181 Material

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Learn about: , and a whole lot more.

Coal Stacker-Reclaimer

Updated June, 20182 Materials

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

Hydraulic Governor

Updated April, 20182 Materials

The governor is a critical component in hydroelectric dams.

Learn about: power, hydraulic, generation, regulate, electricity, 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: Live Schematic, Bleeddown Manifold, Steering, 830E, 930E, Hoist, Split Spool Section, and a whole lot more.


Updated October, 20185 Materials

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

Learn about: Steering, Boom, Wheel Loader, Bucket, Mobile Equipment Hydraulic, Lift, Shock Valve, 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: Cement Metering Valve, Slurry, Mixing Head, Dry Blending, Dust, Oilfield, 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, Maintenance, Positive Displacement Pumping, Quintuplex, Triplex, Discharge Valve, Packing, 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 June, 20181 Material

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

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

Sawmill Conveyors

Updated April, 20181 Material

Sawmills are full of specialized hydraulic and electrical equipment.

Learn about: Belt, Conveyor, Log, Quadrant Feeder, Hydraulic, 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: Truck Dumper, Valve Solenoid Sequence Chart, and a whole lot more.

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