Educational Advantages

• Designed to have students understanding every component found in a typical articulated vehicle's steering, including dual steering cylinders
• Designed to have students learning the hydrostatic transmission or closed-loop system
• Designed to help schools and colleges overcome the critical shortage of highly-skilled hydraulic diagnostic technicians
• Will aid an instructor in teaching students how to troubleshoot the following hydraulic steering system components:
  ○ Fixed displacement pump
  ○ Steering orbitrol valves
  ○ Priority flow dividers
  ○ Steering system’s main pressure relief valves
  ○ Dual cross-port relief valves
  ○ Single and dual steering cylinders
• Will aid an instructor in teaching students how to troubleshoot the following hydrostatic transmission system components:
  ○ Transmission doesn’t operate in either direction – forward or reverse
  ○ Neutral is difficult or impossible to find
  ○ Transmission is overheating and lacks power
  ○ Transmission is sluggish

Educational Advantages

Hydraulic Steering System:

• How a priority flow divider functions (bypass-type, pressure-compensated flow control)
• How a steering orbitrol valve functions
• How a steering system’s main pressure relief valve functions
• How to set the steering system’s main pressure relief valve
• How a dual cross-port relief valve functions
• How to set dual cross port relief valves
• How steering cylinders function
• How to interpret symbols for the components in a typical hydraulic steering system
• How to read the schematic for a typical hydraulic steering system
• How to properly construct a typical steering system and make all the necessary pressure settings
• How a steering pump with integral pressure relief and priority flow control functions
• How dual, single-rod, double-acting steering cylinders function
• Learn safety features including: safety pressure relief valve; breakaway rear wheels; breakway steering

Hydrostatic Transmission System:

• Understand advantages and disadvantages of hydrostatic drives
• Learn typical applications for hydrostatic drives – industrial and mobile
• How to interpret the hydraulic symbols for components in a typical hydrostatic transmission
• How to read the hydraulic schematic for a typical hydrostatic transmission
• Learn safety practices for operating, servicing, repairing, maintaining and troubleshooting hydrostatic transmissions
• How a variable displacement, over-center pump works
• Understand how work pump displacement controllers – manual, manual over hydraulic, and electronic over hydraulic
• Learn proper external drain pump and motor pre-start-up and post start-up procedures
• Learn the function and purpose of a charge pump
• Learn the function and purpose of a charge pressure relief valve
• How to properly set a charge pressure relief valve
• Learn the function and purpose of the dual charge check valves
• How to operate a typical hydrostatic transmission for:
  • System start-up
  • Charge circuit - neutral
  • Charge circuit - forward and reverse
  • Forward operation
  • Reverse operation
  • Low pressure loop operation
  • Dynamic braking
  • Case drain circuit
  • Cooling and filtering circuit
  • High-pressure relief valve operation
• Learn proper and safe towing procedures for vehicles equipped with hydrostatic wheel drive systems.
• Understand the advantages and disadvantages of dual, parallel motors.
• Understand the advantages and disadvantages of dual, series motors.
• How the “dynamic braking” in a hydrostatic drive functions.
• How to construct a dual-parallel drive circuit.
• How to construct a dual-series drive circuit.
• Learn common pitfalls which lead to start-up failures on hydrostatic transmissions.
• Learn common pitfalls which lead to premature failure of hydrostatic transmissions
• How to troubleshoot the following hydrostatic transmission system components:
     ○ Transmission doesn’t operate in either direction – forward or reverse
     ○ Neutral is difficult or impossible to find
     ○ Transmission is overheating and lacks power
     ○ Transmission is sluggish

List of Components Included

Hydraulic Steering System:

• Self-contained, fixed-displacement pump with 1HP, single-phase motor
• Orbitrol steering valve – open-center
• Control console with steering wheel
• Main Pressure relief valve
• Priority flow divider
• Dual, single-rod, double-acting steering cylinders
• Dual, cross-port relief valves with mono-block body
• Safety relief valve
• 0-1000 PSI (0-69 bar) pressure gauge
• Digital temperature gauge
• *Spin on/off filter with by-pass indicator
• *Transparent reservoir with isolator mountings
• All-steel frame with powder-coat finish
• Four (4) wheel casters with brakes

Hydrostatic Transmission System:

• 1.5 HP electric motor: 115V single-phase, C-frame, 1750 RPM
• Variable-displacement, over-center, axial-piston pump with manual operator
• Cut-away of identical pump, which operates in tandem with the drive pump (allows students to study how an over-center pump works while it is operating)
• Dual, fixed-displacement, bi-directional, gerotor-type hydraulic motors
• Control console with manual pump displacement control lever
• Panel-mounted 0-100 PSI (0-6.9 bar) charge pressure gauge
• Dual, in-line, bi-directional flow meters
• *Spin on/off filter with by-pass indicator
• *Digital temperature gauge
• *Transparent reservoir with isolator mountings
• Rear wheels are designed to move independently of axles to prevent safety hazards.

* Common to both systems

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