Orbitrol Steering and Articulation
Objective: Explain the functions of a conventional hand metering unit (HMU)
Activities: Map out flow paths through steering circuits to aid troubleshooting
Know the priority valve functions cold
Electro-Hydraulic Joystick Steering
Objective: Identify the components of a typical joystick steering circuit
Activities: Test electronic proportional steering valves and position transducers
Solidify your skills with steering servo cylinders
Loader Boom Lift and Ride Control
Objective: Identify the components of the boom lift and bucket tilt circuit
Activity: Identify valve centre features as well as load check valves and shock valves
Decode Komatsu WA and Caterpillar ride control circuit functions
Loader and Grader Hydraulic Brakes
Objective: Describe the components and functions of hydraulic brake systems
Activities: Interpret brake accumulator charging circuits and slack adjusters
Know the function of the brake pedal as a pressure reducing valve
Multi-Section Valves
Objective: Identify the unique proportional valve components in use for load sense hydraulics
Activities: Identify pressure compensators in valve, and pilot operated checks
Know the load sense shuttle (resolver) network
Pump Standby and Margin Pressures
Objective: Interpret load sense (flow compensating) pump functions
Activities: Perform pump standby and margin pressure tests
Know your pump up-stroke (swivel-in) and de-stroke (swivel-out) functions
Pilot Valves and Joysticks
Objective: Explain the basic principles of pilot valves (controllers)
Activities: Identify test points for critical pressure tests
Know the function of the joystick as a pressure reducing valve
Auxiliary Implements
Objective: Interpret the circuits for grader rippers and loader bucket accessories
Activities: Confirm the sequence of valve operations
Identify cylinder pressure shock relief valves
Critical Pressure Controls
Objective: Identify critical system pressure controls and their settings
Activities: Adjust the functions of the Caterpillar H series combination valve
Know the maximum load sense pressure relief valve