Belt Conveyor Problems and Fixes: Worn Belts, Tracking, Hot Gearboxes and Motors
Quick answer: Belt conveyor part problems fall into four groups — worn or broken belts, belt mistracking, gearbox overheating and hot motors. Replace aged belts promptly and choose stable materials; for tracking, square the frame and pulleys first, then adjust the idlers; fill gearboxes to the specified oil level and change oil on schedule; for hot motors, clear dust first, then check load and lubrication.
Troubleshooting table
| Symptom | Common causes | Fix |
|---|---|---|
| Belt breaks or ages | Long service, material unsuited to environment, splice fatigue | Replace aged or damaged belts; choose stable materials, protect from water and freezing; inspect splices regularly |
| Belt mistracks | Frame or pulleys out of line, skewed idlers, splice not square to belt centre, off-centre loading | Square frame and pulleys, then adjust idlers; make the splice square; move the loading point to centre |
| Gearbox overheats | Wrong oil level, degraded oil, dirty interior, worn bearings | Fill to the specified level, clean inside regularly, change oil or bearings in time |
| Motor runs hot | Dust blocking cooling, excessive load, dry drive parts | Clear dust around the motor; measure power and find the cause of overload; lubricate the drive |
1. Belt ageing and breakage
Store and use belts as the manufacturer specifies, and have them replaced by qualified staff once cracks, ply separation or broken cords appear. Make sure the belt cannot catch on fixed equipment or drop into metal structures, where it can be cut or torn.
2. Belt mistracking
Work in this order — structure first, idlers second:
- Check and adjust the frame and pulleys so they are straight and parallel;
- Adjust idlers step by step to bring the belt back to centre;
- Make sure the splice is square to the belt centreline;
- Move the loading point so material lands in the middle of the belt.
For lines that mistrack often or run continuously, an Anti-Deviation Belt Conveyor with built-in tracking is the simpler answer.
3. Gearbox overheating
Fill the gearbox to the specified oil level — too much or too little both cause heat. Clean the interior regularly, change oil on schedule and replace worn bearings promptly.
4. Hot motor
First clear dust around the motor to restore cooling, then measure actual power draw to see whether it is overloaded, and finally lubricate the drive components to reduce running resistance.
FAQ
How often should a conveyor belt be replaced?
There is no fixed lifespan; it depends on the material handled, running hours and environment. Replace the belt when you see clear cracks, ply separation, splice failure, or tracking that can no longer be corrected.
I adjusted the idlers and the belt still mistracks — why?
The root cause is usually frame or pulley alignment or a crooked splice. Re-check that the frame and pulleys are straight and the splice is square; idlers alone cannot correct a structural problem for long.
Related equipment
- Anti-Deviation Belt Conveyor — automatic or manual tracking for continuous duty
- Detachable Belt Conveyor — modular, easy to replace and re-route
- Frequent breakdowns? Contact our engineers for a retrofit assessment.
Our engineers offer free selection and solution design
