A belt that repeatedly leaves its pulleys needs a system check. Fitting another belt without finding the cause can repeat the failure.
Start with the last change
If the problem began after a replacement, compare the new belt’s reference and route with the correct manual. Check that it passes on the intended side of every idler and keeper. A photograph of the old layout is helpful, but it may preserve an earlier routing mistake.
Look for damage and misalignment
After safe isolation, inspect accessible pulleys, brackets and belt guides for impact damage, wear or looseness. Fraying on one edge can help locate a rubbing point. Do not bend guides or set clearances by eye: use the manufacturer’s dimensions.
Check tensioning components
A sticking tensioner, damaged spring or worn bearing can prevent the belt from tracking correctly. Stored spring force makes dismantling hazardous; follow the service procedure or ask a repairer. A longer or shorter belt is not a repair for a faulty tensioner.
Fix the cause before restarting
Remove debris using the method in the manual and have damaged components repaired. Refit guards before operating. Stop again if the belt moves out of position, rubs or smells hot. Record where the damage appears so the repairer can trace the fault.
Common question
Should I fit a shorter belt?
No. Confirm the specified belt and investigate routing, alignment and tensioning first.
Find the right replacement
Use the confirmed machine and part details to narrow your search. Check the individual listing before ordering.