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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.
Tie Band Separation
Q
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.