When Does Conveyor Wear Strip Need Replacing?

Five signs worth watching for, and how to decide before the line decides for you.

Wear strip is the least glamorous component on a conveyor. It is a length of plastic or metal that the chain slides along — which is why it is also called slide rail — preventing wear to the chain and to the extrusion the chain runs in. Almost nobody thinks about it until there is a problem.

It is also, quietly, one of the most critical components. Wear strip is designed to absorb wear that would otherwise go into the beam and the chain. When it stops doing that job, everything starts wearing faster, and the bill arrives in a replaced conveyor section rather than in a length of wear strip.

Here is how to tell when yours is worn out.

1. You Can See Shiny Metal Where the Beam Is Exposed

Like a beacon warning you of a rocky shore, shiny metal showing through your conveyor chain signals a dangerous situation. Wear strip wears fastest where there is more pressure from the chain, such as vertical and horizontal plain bends. Those are the first places to look.

2. Grooves in Your Wear Strip

Wear strip develops grooves where the chain has been riding, usually when there is a contaminant between the chain and the strip. Compare a heavily loaded section against a stretch of the same line that sees fewer contaminants — a straight run near the discharge against a lightly loaded return, for instance. If one is visibly grooved and the other is not, replace the wear strip and check the bottom of your chain for debris that needs removing.

Another symptom of grooving is dust. Look for dust building up on your beam.

3. The Motor Is Working Harder

As wear strip degrades, friction rises and the drive has to overcome it. If you trend motor current or power draw, a slow upward drift on a line whose duty has not changed is worth investigating. It will not spike. It creeps.

The same symptom can come from tension, alignment or a drive problem, so it points you toward an inspection rather than a conclusion.

4. Something Sounds Different

Squealing, chattering or chain grabbing through bends usually means the chain is no longer sliding cleanly. Operators tend to notice this before maintenance does — they hear the line every day. It is worth asking them.

5. The Chain Is Riding Low

As material wears away, the chain sits lower than it did when the strip was new. On lines with a fixed reference point — a transfer, a guide, a fixed sensor — a drop in running height is measurable rather than subjective. If transfers that used to run cleanly have started catching, check the height.

How Often Should Wear Strip Be Replaced?

There is no honest universal answer, and be cautious of anyone who offers one. Wear strip life depends on load, line speed, duty cycle, product abrasiveness, temperature, whether the environment involves washdown or coolant, and even dust in the air. Two identical conveyors in two different plants will not wear at the same rate.

What works better than a calendar is a baseline. Record the strip thickness when the line is new or freshly rebuilt, check the high-wear zones — vertical and horizontal bends, transfers, inclines, accumulation — on a fixed interval, and let the measurements set the interval instead of guessing at it.

Before You Inspect

Lock out and tag out the conveyor before inspecting, reaching into, or working near a drive or transfer point. Never assess a running line by touch. Follow your plant's energy-control procedures and the applicable conveyor safety standards. Our post on common conveyor safety hazards covers the rest.

What to Keep on the Shelf

Wear strip is inexpensive relative to what its failure costs, which puts it near the top of most stocking lists we write. The same is true of chain — and because they are usually replaced together, holding one without the other only gets you halfway through the repair.

Flex-Line stocks wear strip and guide kits and conveyor chain, and writes stocking recommendations for individual systems at no charge. If you are not sure what your line should be holding, tell us what it is and what it runs.

Frequently Asked Questions

How do I know when conveyor wear strips need replacing?

Look for shiny metal, visible grooving where the chain runs, excessive dusting, rising motor current on an unchanged duty cycle, new squealing or chain grab through bends, or chain riding lower than it used to.

How long do conveyor wear strips last?

There is no universal figure. Wear strip life depends on load, speed, duty cycle, product abrasiveness, temperature, washdown or coolant exposure, environmental factors and alignment. Establishing a thickness baseline and inspecting high-wear zones on a fixed interval is more reliable than a calendar.

Should conveyor chain and wear strips be replaced at the same time?

Properly installed wear strip extends the life of your chain. If you are installing new chain you should usually install new wear strip, but new wear strip does not always require new chain.

Which parts of a conveyor wear fastest?

Vertical and horizontal bends, transfers, inclines and accumulation zones wear faster than straight runs and should be inspected first.

Is rising motor current always a wear strip problem?

No. A gradual rise in current draw on an unchanged line often indicates increased friction from worn wear strip, but tension, alignment and drive problems produce the same symptom. It warrants an inspection rather than an immediate conclusion.