Conveyor Belt Mistracking: Is Your Belt Really the Issue?

Updated: 2026-05-18 View Count: 60

Belt drift happens on every mine site and some movement is normal and harmless. But when belts start to damage the structure, spill material, or spoil belt edges, minor tracking becomes a major problem, and an expensive one.

For maintenance superintendents, the challenge is figuring out the root cause of mistracking. Is carryback throwing the load off centre? Your rollers are out of alignment? Uneven tension? 

These problems can be hard to spot, especially when maintenance crews are stretched thin and under pressure to get the conveyor running again. 

If you’re struggling with mistracking, we recommend these 6 areas to solve the problem properly. Fixing these can help your maintenance team fix the real issue, extend belt life, and reduce unplanned downtime.

1. Misaligned components after maintenance work

During construction, installers typically align components like idler frames and pulleys using survey equipment to check that everything is square. Over time though, the structure moves. Ground conditions shift, and when maintenance crews are called in at midnight for an urgent fix, precision often takes a backseat to speed.

“When you replace a pulley or an idler frame and eyeball it. Those slight errors stack up over time and lead to tracking issues,” explains Elvin Sey, Mechanical Engineer at YILUN. He says a good example of this is when idler frames and pulleys are mounted via slotted holes, and the fitters tend to eyeball their position during quick replacements. Even a few millimetres difference creates angular misalignment that compounds.

Idler frame misalignment fundamentally changes the belt’s tension distribution. Whereas when the belt enters a pulley on an angle, it exits on an angle, causing tracking issues that compound with every belt cycle. It’s a gradual contributor to wear that you don’t notice until there’s visible belt damage or spillage.

What to check:

◆ Idler frame squareness during replacements

◆ Pulley alignment using surveying tools (laser or prism-based tools)

◆ Accumulated drift over time due to structural movement

2. Seized or misaligned rollers 

Seized rollers can create serious tracking and wear issues. When a roller seizes, the belt slides over it, creating friction, heat, and tension imbalance. The result? Your belt tracks towards the side of the seized roller.

“A seized roller acts like a brake,” Elvin notes. “It can drag on the belt and pull it to one side, especially on fabric belts 1000mm or less.” Even slight roller misalignment can lift one edge of the belt, increasing tension locally. The belt then tries to ‘self-correct’, shifting to neutralise the imbalance which wears out the belt edges and structural components.

There is a simple way to solve this: choose high-quality rollers with a three-tiered sealing system on the bearings, balanced shell design, and robust construction. The seals are key because different rollers on the market can vary wildly depending on quality, with some low-quality options known to fail 6x sooner.

What to check:

◆ Regular inspections for seized or dragging rollers (thermal imaging can help identify friction points)

◆ Uneven roller heights causing tension imbalance

◆ Roller lagging condition, especially in wet environments

3. Off-centre material loading at the chute

Your belt can be aligned perfectly but you will still have problems if the material isn’t loaded evenly. This is one of the most overlooked causes of belt tracking and damage, yet the physics are straightforward. 

“If material is loaded to the left, the centre of mass pulls the belt down to the right,” explains Elvin. Even if the belt is perfectly aligned, consistent off-centre loading will force the belt to shift in that direction. The material’s centre of mass moves central, and the belt follows. 

We often see this at the tail end, or loading zone, where chute misalignment, improper feed points, or uncontrolled material streams create persistent imbalances.

Loading issues are tricky to spot because they can develop gradually. Material trajectory often shifts over time due to structural settling or wear. Different material streams can merge without proper control, and create variable loading patterns that your belt.

In situations like this, persuaders are a good stabilisation option. You want a persuader that has a static frame with heavy-duty guide rollers running on the edge of the belt to keep the belt aligned.

“Ideally you would install one persuader just before and after the chute to help “Ideally you would install persuaders coming into the tail pulley, just before the loading zone, and after, to help guide the belt back into position downstream of an uneven load,” says Elvin. He explains that sometimes more than one persuader is needed to help distribute the load and prevent belt damage. While persuaders don’t solve the root problem, they reduce edge damage and structural wear by keeping the belt tracking consistently until you can make a long-term fix.

What to check:

◆ Whether material is entering the chute evenly

◆ Variations in feed (different grades, densities, or moisture levels)

◆ Whether the chute or skirted area has shifted or worn over time

4. High-tension zones that amplify minor issues

Belt tension is never uniform across your conveyor. These variations in tension influence mistracking differently. For example, the carry side near the head pulley is under a lot more tension than the return side and will respond differently to mistracking. Low tension or ‘slack-side’ of the belt and areas around tensioning devices are other problem spots.

High-tension zones can easily amplify small tracking issues. “In the high-tension areas, the belt is more rigid. That’s where structure or belt edge damage often starts,” Elvin says. The belt has less flexibility here, so it can’t deform or adjust to absorb error.

That’s why precise alignment is crucial in high-tension zones. Components that work fine in low-tension areas can cause significant problems when placed in high-tension zones.

While high-tension zones aren’t ideal for adding correction devices, you can use persuaders if tracking is creating an urgent risk to the structure or belt. They act as a stabiliser to keep things aligned until a permanent fix (like realignment or structural repair) can be scheduled.

What to check:

◆ Component alignment in high-tension zones

◆ Structural rigidity near head and take-up pulleys

◆ Belt edge wear or fraying concentrated in these areas

5. Belt splices that shift the line

The quality and geometry of a belt splice matters more than many maintenance teams realise. If the splice creates a slight offset, change in thickness, or local stiffness variation, it can alter how the belt tracks.

“Splices can introduce tracking issues if they aren’t done well,” Elvin notes. Even small inconsistencies can cause the belt to ‘hunt’ as it moves, shifting side to side to find a new equilibrium. Over time, this movement causes uneven wear on the belt and surrounding structure.

This is another problem that’s hard to spot because splice-related tracking issues usually develop gradually. A splice that seems fine at first can begin causing problems weeks or months later as the belt settles into new wear patterns.

What to check:

◆ Splice geometry and alignment post-installation

◆ Skirt and roller wear near the splice area

◆ Belt tension uniformity before and after the splice

6. Over-reliance on trainer frames and band-aid fixes

Trainer frames and tracking aids are valuable tools, but they’re often overused as quick fixes. Without understanding the root cause, this approach often masks the real issue and you end up stuck in reactive quick-fix mode.

Elvin has seen the extreme end of this approach: “On some mines we’ve seen up to 10 trainer frames in a row. It’s a band-aid, not a long-term solution.” Trainer frames are most effective on the return side, where the belt is unloaded and easier to steer. Carry-side frames are less effective because the loaded belt has too much inertia. It’s also a mistake to install frames too close to pulleys or in high-tension areas: this can do more harm than good.

Each time you add a trainer frame without addressing the underlying problem is a missed opportunity to solve the real issue. The belt might track better temporarily, but the root cause remains and will keep creating downtime and urgent repair jobs.

What to check:

◆ Whether trainer frames are installed in optimal (low-tension) locations

◆ Adequate distance from pulleys to allow proper correction

◆ Whether tracking issues are recurring despite multiple trainer installations

Find the root causes to create long-term maintenance wins

Quick fixes like trainer frames or persuaders can keep the belt running, but they won’t solve underlying problems. Identifying the real cause takes time and often a whole-team approach.

As Elvin puts it, “We’ve seen six-year belts that had to be replaced after only two. That’s millions lost.” For site superintendents and maintenance managers, the key is knowing when to treat the symptom and when to dig deeper. 

The choice between quick fixes and root cause analysis isn’t always clear-cut. Often you have to use a band-aid to keep production running then plan a proper fix later. But understanding the difference between addressing symptoms and solving problems can mean the difference between a belt that lasts its designed life and one that fails prematurely, taking productivity and profits with it.