Conveyor systems are the backbone of aggregate and material handling operations. When they go down—or even run inefficiently—production slows, costs rise, and equipment wear accelerates.

At Mellott, we see firsthand how small conveyor issues can quickly become major operational problems. The good news: most conveyor failures are predictable, diagnosable, and preventable.

Below are 14 of the most common problems, their root causes, and proven solutions used in the field to keep operations moving.

1. Idlers or pulleys not square to the belt centerline

Cause: Misalignment during installation or adjustment
Solution: Re-align in the affected area to ensure they are square to the belt centerline.

2. Crooked conveyor frame or structure

Cause: Structural shift or poor installation
Solution: Inspect and straighten the conveyor frame to restore proper alignment.

3. Idler stands not centered on the belt

Cause: Improper placement or movement over time
Solution: Re-center idler stands and verify consistent belt tracking.

4. Sticking or seized idlers

Cause: Worn bearings, lack of lubrication, or contamination
Solution: Repair or replace idlers and strengthen preventive maintenance and lubrication schedules.

5. Material buildup on idlers

Cause: Sticky material, inadequate cleaning systems
Solution: Remove buildup and install scrapers or belt-cleaning systems to prevent recurrence.

6. Belt splice not square

Cause: Incorrect splicing procedure
Solution: Remove and properly re-splice the belt to restore tracking integrity.

7. Bowed belt

Cause: Improper storage, handling, or new belt break-in behavior
Solution: Allow break-in time for new belts. If persistent, inspect handling/storage practices or replace the belt if necessary.

8. Off-center or improper loading

Cause: Misaligned chute or uneven feed distribution
Solution: Adjust chute design to center material load and match belt direction and speed.

9. on drive pulley

Cause: Low tension or insufficient friction
Solution: Increase belt tension using take-up or counterweight systems. Add lagging or increase wrap angle on the drive pulley.

10. Material spillage and buildup

Cause: Poor transfer point design or containment failure
Solution: Improve loading and transfer zones. Install or upgrade sealing and cleaning systems.

11. Bolt heads protruding above lagging

Cause: Improper installation or worn lagging
Solution: Tighten or replace bolts and upgrade to vulcanized lagging where appropriate.

12. Excessive belt tension

Cause: Over-tensioning or excessive system friction
Solution: Reduce load or increase belt speed where possible. Improve idler performance, reduce friction points, and optimize pulley lagging and wrap.

13. Improperly adjusted

Cause: Incorrect setup or worn materials
Solution: Adjust skirt boards to maintain proper clearance. Use proper skirt rubber designed for sealing—not worn belt material.

14. Material jams in chute

Cause: Poor chute geometry or flow restriction
Solution: Redesign chute angle and width to ensure smooth, consistent material flow.

Prevent Conveyor Failures Before They Start

Most conveyor problems don’t happen suddenly—they build over time through misalignment, wear, and poor material control. Regular inspection and proactive maintenance can dramatically extend equipment life and reduce unplanned downtime.

Mellott supports producers with field service expertise, conveyor system optimization, and replacement parts designed to keep your operation running at peak performance.

Need Help Diagnosing a Conveyor Issue?

If you’re dealing with recurring belt tracking problems, spillage, or mechanical failures, our team can help identify root causes and recommend long-term fixes—not just temporary repairs.

Contact Mellott to keep your conveyor systems running efficiently and your production on track.

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That’s where strong aggregate plant management makes the difference. Whether you’re processing materials for major construction jobs or specialized applications, optimizing your plant is essential to boosting productivity and keeping costs in check. This guide outlines proven strategies to help your operation run smarter and more reliably.

What Is an Aggregate Plant?

An aggregate plant processes raw materials like crushed stone, sand, and gravel into specific grades used in construction and manufacturing. These materials must meet strict quality and .   Efficient processing is what makes that possible.

Key components such as feeders, crushers, screens, and conveyors work together to transform large rocks and minerals into usable products. The goal is simple: produce consistent, high-quality output while minimizing energy use and downtime.

How Aggregate Processing Works

To run a high-performing plant, you need to understand the full processing flow — from extraction to final product. Here’s a breakdown of each stage:

• Feeding: The first step involves consistently delivering raw material to the crushers and screens. Reliable help maintain flow and avoid overloads or stoppages.
• Crushing: reduce large rocks into smaller aggregates. Depending on the application, jaw, cone, or impact crushers may be used. Routine maintenance ensures they run efficiently and extend their service life.
• Screening: Vibrating screens sort materials into defined sizes. Efficient screening is critical for quality control and reducing waste.
• Washing (When Needed): In cases where cleanliness is key,  like in concrete or asphalt applications– removes fines or contaminants. Though it adds cost and complexity, it significantly improves product consistency and performance.

Best Practices for Aggregate Plant Optimization

Running an efficient plant goes beyond just equipment.   It involves smart systems, consistent upkeep, and skilled operators. Here are some of Mellott’s top recommendations:

• Stay on Top of Maintenance: Avoid downtime by sticking to a regular schedule. Inspect crushers, screens, and conveyors frequently to ensure they’re performing at their best.
• Leverage Automation: Automated systems can monitor and adjust feed rates, crusher settings, and screen performance in real time. This improves consistency, enhances safety, and reduces the need for manual intervention.
• Use Monitoring Tools: Data tracking tools give you real-time insights into plant performance. With the right analytics, you can pinpoint inefficiencies, identify bottlenecks, and make informed decisions about upgrades or changes.
• Prioritize Energy Efficiency: Installing high-efficiency motors and optimizing layout can significantly reduce energy costs. Lower energy usage also supports your sustainability goals.
• Train Your Team: Technology matters, but so do people. Ongoing training ensures your operators are skilled, safety-conscious, and capable of quickly spotting and addressing issues.

Choosing the Right Equipment for Your Plant

Selecting the right processing equipment is one of the most critical decisions in any aggregate operation. Consider the following when evaluating your needs:

• Material Type: Harder materials require more robust crushers. Choose equipment designed for your specific input materials.
• Production Needs: Match equipment capacity to your production demands. Overestimating can waste energy, while underestimating leads to costly slowdowns.
• Scalability: Choose systems that can grow with your business. Scalable equipment allows for capacity upgrades without requiring a complete plant overhaul.

Tips to Boost Plant Productivity

Maximizing output without sacrificing quality requires streamlined processes and proactive planning. Here’s how to get there:

1. Optimize Material Flow: Efficient material handling reduces delays and blockages. Well-designed conveyors, chutes, and hoppers are essential for keeping materials moving smoothly.
2. Implement Quality Control: Inspect materials at every stage to ensure they meet your standards. This reduces rework, maintains consistency, and keeps customers satisfied.
3. Plan for Uptime: Keep spare parts on hand and develop a plan for fast repairs. Even short downtimes can cost thousands, so preparation is key.

Partner with Mellott to Improve Efficiency

Long-term success in the aggregate industry depends on smart plant management.  Mellott is here to help you make that happen! Whether you’re upgrading your existing setup or building a new plant from the ground up, we provide expert consulting, custom solutions, and the best equipment offered in the industry to maximize your performance.

Ready to take your plant to the next level? Contact Mellott today to learn how we can help you streamline your operation, increase productivity, and get the most out of every ton.

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