An (also called track adjuster assembly) is the undercarriage part that maintains proper track tension for excavators.
Main Function
track derailment
Keep the track at optimal tightness to prevent and excessive wear.
Absorb walking impact and vibration, protecting idler, sprocket, track links and Undercarriage Parts.
Adjust track tension via grease injection and relief.
Main Components
Tensioner cylinder
Recoil buffer spring
Cylinder rod & piston
Grease fitting
Seal kits & end cover
Common Types
Hydraulic Type
– Adjust tension by injecting grease; widely used on medium & large excavators.
Mechanical Spring Type
– Simple structure, mostly for mini excavators.
Hydraulic + Spring Combined Type
– For tension adjustment and shock buffering, standard on heavy-duty excavators.
Common Fault Symptoms
Track loose, wandering or frequent derailment
Abnormal knocking/rubbing noise when traveling
Oil/grease leakage from tensioner cylinder
Spring deformation, fatigue or breakage
Unable to hold track tension after adjustment
Applicable Models
Komatsu PC series, Volvo EC series, Caterpillar CAT series, Hitachi ZAX series and most brand excavators.
