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Undercord Cracking Sheaves too small for belt section Belt slip
Backside idler diameter too small Excessive hot or cold temperature Improper belt storage
L
Turns Over or Comes Off Drive Shock loading or vibration Foreign material in grooves Sheave misalignment Worn sheave grooves
Subminimal diameter sheave M
Sidewall Burn or Hardening Belt slip
Worn sheaves
Under-designed drive Shaft movement
N O
Wear on Bottom Corner Belt-to-sheave fit incorrect Worn sheaves
Unusual Noise Incorrect belt for sheaves Incorrect tension Worn sheaves
Debris in sheaves Sheave misalignment P
Top of Tie Band Damage Interference with guard Backside idler malfunction Debris in sheaves
Q
Tie Band Separation Improper groove spacing Worn or incorrect sheaves Sheave misalignment
R
Broken Belt Under-designed drive
Belt rolled or pried onto sheave Object falling into drive Severe shock load
Tie Band Separation
Q
Broken Belt
R Corrective Action Use larger diameter sheaves
Retension to manufacturer’s recommendations Increase backside idler to acceptable diameter Control drive environment
Don’t coil belt too tightly, kink, or bend. Avoid heat & direct sunlight Check drive design
Shield grooves & drive Realign drive
Replace sheaves Replace sheave with correct diameter
Retension to manufacturer’s recommendations Replace sheaves
Redesign to manufacturer’s recommendations Check for center distance changes
Use correct belt/sheave match Replace sheaves
Use correct belt size & type Check belt tension & adjust Replace sheaves
Clean sheaves; improve shielding; remove rust, paint; or remove dirt from grooves Realign drive
Check & adjust guard
Replace or repair backside idler Clean sheaves
Use sheaves manufactured to industry specifications Replace sheaves Realign drive
Redesign to manufacturers recommendations Use drive center distance adjustment when installing Provide adequate guard or drive protection Redesign to accommodate shock load