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Home Timing-belt drive symptoms

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Timing-belt drive symptoms


Symptoms Probable cause Corrective action

Timing-belt drive symptoms

Unusual noise

Ungewöhnliche Geräuschentwicklung
  • Misaligned drive
  • Too low or high tension
  • Backside idler
  • Worn pulley
  • Bent guide flange
  • Belt speed too high
  • Subminimal diameter
  • Excessive load
  • Correct alignment
  • Adjust to recommended value
  • Use inside idler
  • Replace pulley
  • Redesign drive
  • Use proper belt/pulley combination
Tension Loss
  • Weak support structure
  • Excessive pulley wear
  • Excessive debris
  • Excessive load
  • Subminimal diameter
  • Reinforce structure
  • Use alternate pulley material
  • Use inside idler for belt adjustment
  • Remove debris, check guard
  • Redesign drive using larger diameters
Excessive Belt Edge Wear
  • Damage due to handling
  • Flange damage
  • Belt too wide
  • Belt tension too low
  • Follow proper handling instructions
  • Repair flange or replace pulley
  • Use proper width pulley
  • Adjust tension to recommended value
Tensile Break
  • Excessive shock load
  • Subminimal diameter
  • Improper belt handling and storage
  • Debris or foreign object in drive
  • Redesign drive for increased capacity
  • Redesign drive using larger diameters
  • Remove objects and check guard
  • Replace pulley
Belt Cracking

Problem der Rissbildung am Zahnriemen
  • Subminimal diameter
  • Backside idler
  • Extreme low temperature at start-up
  • Extended exposure to chemicals
  • Redesign drive using larger diameter
  • Use inside idler or increase diameter of backside idler
  • Pre-heat drive environment
Premature Tooth Wear
  • Too low or high belt tension
  • Belt running partly off unflanged pulley
  • Misaligned drive
  • Worn pulley
  • Adjust to recommended value
  • Correct alignment
  • Use proper belt/pulley combination
Tooth Shear

Abscheren einzelner Zähne
  • Excessive shock loads
  • Less than 6 teeth-in-mesh
  • Extreme pulley run-out
  • Worn pulley
  • Redesign drive for increased capacity
  • Replace pulley
  • Use proper belt/pulley combination

Synchronous Sprocket Problems

Flange Failure
  • Belt forcing flange off
  • Correct alignment or properly secure flange to pulley
Land Area Worn
  • Excessive tension
  • Excessive pulley wear
  • Adjust tension to recommended value
  • Check pulley condition. Replace if necessary

Performance Problems

Belt Tracking
  • Belt running partly off unflanged pulley
  • Centers exceed 8 times small pulley diameter
  • Excessive belt edge wear
  • Correct alignment
  • Correct alignment
Excessive Temperature
  • Misaligned drive
  • Too low or high belt tension
  • Incorrect belt profile
  • Correct alignment
  • Adjust tension to recommended value
  • Use proper belt/pulley combination
Shafts Out of Sync
  • Design error
  • Incorrect belt
  • Use correct pulley sizes
  • Use correct belt with correct tooth profile for grooves
Vibration
  • Incorrect belt
  • Poor machine or equipment design
  • Pulley out of round
  • Loose drive components
  • Use correct belt cross section in pulley. Use correct tooth profile and pitch in pulley
  • Check structure and brackets for adequate strength
  • Replace with non-defective pulley
  • Check machine components and guards, motor mounts, motor, pads, bushings, brackets, etc.
Incorrect driveN speed
  • Wrong belt calculation
  • Belt slip
  • Redesign of the drive
  • Retension