Advanced Mobile with Load Sense Hydraulic Troubleshooting
Advanced Mobile with Load Sense Hydraulic Troubleshooting
Is your diesel consumption too high? Is the hydraulic fluid hotter than normal? Is cylinder, motor or steering motion uneven or erratic? These symptoms point to a problem at the valve bank, the priority valve, the pump’s compensator or the load sense line.
Who should attend?
This course is for maintenance mechanics and technicians, and maintenance foremen/supervisors who are charged with the care of mobile equipment with load sensing hydraulic systems.
Load sensing systems use pressure feedback from the loaded actuators to constantly modify and control the pump’s displacement. The result is less wasted energy at the prime mover and greater flow accuracy within the system. These features along with priority valves and electronic proportional valves add complexity to the system.
Adjustments and the Ten Step Troubleshooting Process are covered along with plenty of schematic reading practice specific to load sense systems.
This two-day course is taught with circuit simulation software, oilfield and mobile machinery schematics and on-screen simulations, and through instructor guided hands-on study of individual cut-away hydraulic components.
Learn How To:
- Explain “load sense” or “flow compensating” principles
- Analyze load sense circuit schematics
- Adjust load sense pumps and set the stand-by pressure
- Identify priority valve features and ports
- Describe steering valve features
- Analyze common electronic proportional valves
- Troubleshoot common load sense system problems
- Work safely around hydraulic systems
HYDRAULIC THEORY
Objective: Explain the principles of hydraulics
Activity: Predict fluid behaviour in various systems
JOYSTICKS AND PILOT CONTROLLERS
Objective: Analyze joystick and complete valve pilot networks
Activity: Interpret schematics for logic conditions and pump flow allocations
LOADER RIDE CONTROL CIRCUITS
Objective: Analyze valve and ECM logic for ride control circuits
Activity: Determine what speeds activate and deactivate ride control
LOAD SENSING SYSTEMS DESIGN
Objective: Analyse circuit components and their relationships
Activity: Interpret symbols and component connections on typical systems
LOAD SENSING DIRECTIONAL VALVES
Objective: Explain the features of common load sense proportional directional valves
Activity: Interpret catalogue data to determine valve port, functions/features
LOAD SENSING (FLOW COMPENSATING) PUMPS
Objective: Identify pump compensator connections and functions
Activity: Determine pump control response to various machine load scenarios
MOBILE PRIORITY VALVES
Objective: Identify priority valve features and ports
Activity: Sketch a diagram that shows how to favour machine steering above all other functions
MOBILE STEERING VALVES
Objective: Explain steering valve servo functions
Activity: Determine potential leakage paths through shock relief and anti-cavitation valves
SPECIALIZED PRESSURE CONTROL VALVES
Objective: Analyze the function of combination pressure control valves
Activity: Describe the responses of pressure controls and the signals to the pumps
FLOW STABILIZING FUNCTION
Objective: Describe how load sense systems regulate flow
Activity: Predict pump response to prime mover RPM variance
CIRCUIT TROUBLESHOOTING
Objective: List common faults and remedies in load sense circuits
Activity: Diagnose faults on simulated systems and list the causes
SAFETY
Objective: List common hydraulic hazards and safe procedures
Activity: Determine procedures for safe work on hydraulic systems
Where to go from here?
Advanced Mobile with Load Sense is part of a general hydraulics training plan. Other courses at the same level include Hydrostatic Drive Troubleshooting Boot Camp, and Advanced Hydraulics Troubleshooting & Motion Control.
