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K 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 WEAR ON BOTTOM CORNER Belt-to-sheave fit incorrect
Worn sheaves
O 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
Broken Belt 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 and direct sunlight Check drive design
Shield grooves and 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 and type Check belt tension and adjust Replace sheaves
Clean sheaves; improve shielding; remove rust, paint; or remove dirt from grooves Realign drive
Check and 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