HWH Corporation
(On I-80, Exit 267 South)
2096 Moscow Road
Moscow, Iowa 52760

Phone: (563)724-3396 or (800)321-3494
Fax: (563)724-3408

Business Hours: 8 a.m. - 5 p.m. Central Time (M-F)

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CHAPTER 1. Preface

CHAPTER 2. Hydraulic Leveling and Air Suspensions

• 2-1 How air suspensions affect hydraulic leveling
  
• 2-2 HWH air dump systems with HWH valves
  
  • 2-2.1 Air dump valve information
    
  • 2-2.2 HWH air dump system operation information
    
  • 2-2.3 HWH air dump system diagnostics
    
• 2-3 Pilot operated air dump systems
  
  • 2-3.1 Pilot air dump equipment
    
  • 2-3.2 HWH pilot air dump controls
    
  • 2-3.3 Pilot air dump operation with the different HWH controls
    
  • 2-3.4 Pilot air dump diagnostics
    

CHAPTER 3. HWH Air Leveling

• 3-1 What is air leveling
  
• 3-2 Components of a basic air leveling system
  
  • 3-2.1 Control boxes
    
  • 3-2.2 Touch panels
    
  • 3-2.3 Air solenoid valve manifolds
    
    • 3-2.3.1 Air manifold solenoid valves
      
    • 3-2.3.2 Air manifold pressure switches
      
    • 3-2.3.3 Air manifold air line fittings
      
    • 3-2.3.4 Air manifold check valves
      
    • 3-2.3.5 Air manifold travel by-pass T-handle
      
  • 3-2.4 The auxiliary air compressor
    
  • 3-2.5 Specialty air manifolds for tag lift systems
    
• 3-3 System plumbing
  
• 3-4 System wiring
  
• 3-5 The five basic "modes" of air leveling; travel mode, raise or dump mode, leveling mode, sleep
  mode and excess slope mode
  
  • 3-5.1 Travel mode
    
  • 3-5.2 Raise or Dump mode
    
  • 3-5.3 Leveling modes
    
    • 3-5.3.1 Manual leveling
      
    • 3-5.3.2 Automatic leveling
      
  • 3-5.4 The Sleep mode
    
  • 3-5.5 Excess slope
    
• 3-6 Tag dump
  
• 3-7 Schematic representations of air manifold functions
  
  • 3-7.1 Travel mode schematic
    
  • 3-7.2 Leveling raise mode schematic
    
  • 3-7.3 Leveling lower mode schematic
    
  • 3-7.4 Tag dump/lift schematics
    
• 3-8 Schematic representations of the HWH auxiliary air compressor
  
  • 3-8.1 The single output air compressor
    
  • 3-8.2 The multiple output air compressor
    
• 3-9 General diagnostics for air leveling systems
  
  • 3-9.1 Diagnosing air manifold pressure switch problems
    
  • 3-9.2 Diagnosing travel mode issues

Test