Hitachi ZX17U-5 Track Tension Issue

[MikePhua]

Maintaining proper track tension on the Hitachi ZX17U-5 mini excavator is crucial for optimal performance, component longevity, and safe operation. Improper track tension, whether too loose or too tight, can lead to accelerated wear, poor traction, and increased risk of track derailment.
Impact of Incorrect Track Tension

• Too Tight: Excessive tension increases the load on the drive sprocket, idlers, and track links, causing premature wear and higher fuel consumption due to increased rolling resistance. The machine may also experience harder steering and reduced maneuverability.
  
• Too Loose: Loose tracks can slip, skip or even derail, leading to damage to undercarriage components and potential safety hazards. Loose tracks also cause a rough ride and inefficient power transfer.
  

Checking and Adjusting Track Tension

• Track tension should be checked regularly against manufacturer specifications; for small excavators like ZX17U-5, the allowable sag is minimal.
  
• The process involves raising the machine slightly, usually with the bucket lowered to stabilize the undercarriage.
  
• Grease is added or released from the track adjuster cylinder or tensioner mechanism to fine-tune tension.
  
• One shot from a grease gun can alter tension by several millimeters; therefore, small incremental adjustments and rechecks are vital.
  

Environmental and Operating Factors

• Operating in muddy or rocky terrain can compact material between track links and rollers, affecting tension and wear.
  
• Regular cleaning of mud and debris helps prevent increased tension and uneven wear.
  
• Limit reverse travel as reverse puts greater loads on pins, bushings, and sprocket teeth, accelerating wear.
  

Maintenance Practices

• Frequent inspections of the undercarriage and track system identify early signs of wear or tension loss.
  
• Cleaning track frames and rollers prevents material buildup which would otherwise affect tension and cause premature wear.
  
• Replace worn parts such as track pins, bushings, and rollers promptly to maintain track system integrity.
  

Expert Recommendations

• Follow the operator’s manual instructions for track tension adjustment specific to ZX17U-5.
  
• Use high-quality grease compatible with the track adjuster to ensure smooth operation.
  
• Consider undercarriage component wear when resetting track tension; worn parts may require more frequent adjustments.
  
• Train operators on the importance of track tension and proper skid steer operation to extend component life.
  

Summary
Proper track tension on the Hitachi ZX17U-5 mini excavator is a balance crucial for machine longevity and performance. Too tight tension accelerates component wear and increases fuel use, while overly loose tracks risk derailment and damage. Regular inspection, cleaning, and careful adjustment using the hydraulic tensioner system maintain correct track sag, ensuring efficient, safe, and productive excavator operations across diverse job site conditions.