Repair or replace a conveyor is a structural question, not a financial one, and it gets answered by walking the machine rather than reading its build date. Steel does not go bad with age. The parts bolted to it do, and belt, idlers, liners, and lagging all renew on a frame that is still straight and still carrying. The decision turns on that frame: sound, or undersized, racked, and cracking.
The Short Answer
Repair when the frame is sound and what wore out is wear parts. Belt, idlers, bed slats, liners, lagging, bearings, sprockets, chain. Those are consumables. They are supposed to wear out, and renewing them on a good frame is the cheapest work in the plant.
Replace when the frame itself is undersized or cracking. No belt fixes a structure built too light for the load.
Remcon makes money either way. We fabricate new conveyors and we repair and refurbish used equipment, which is why this next part is safe to say: anyone who quotes you a new line without looking at the old frame is selling, not diagnosing.
The Test Is the Frame, Not the Calendar
Age is the wrong input. A 30-year-old conveyor built heavy for the material it still carries is worth rebuilding. A six-year-old conveyor specified two weight classes light for the stream it got handed is not. The only question is whether the structure under the wear parts still carries the load. Your own people can answer that with a tape measure, a flashlight, and an hour.
The Inspection Checklist
Four things get judged running, from outside the guarding: belt tracking, drive and bearing noise, belt sag, and where material actually spills. Then shut it down and lock it out. OSHA's control of hazardous energy standard, 29 CFR 1910.147, applies as soon as the work means removing a guard or reaching into the machine. Go tail to head, and write findings down instead of deciding as you go. The pattern matters more than any single item.
1. Frame and Stringers
Sight down each stringer from the tail with the belt empty, looking for a permanent bow. Steel that has yielded does not spring back, and a stringer holding a curve was loaded past what it was sized for. Then check square: measure the frame diagonally at several points along the run. On a frame that has not moved, the diagonals match. If they do not, the frame is racked: settled foundation, loose bolts, or an impact. A racked frame fights the belt forever.
2. Cracking at Welds and Load Points
In welded steel, fatigue cracks overwhelmingly start at the welds, because the weld toe is a notch and notches concentrate stress. Look where the welds are and where the loads land: stringer-to-leg connections, gussets, hopper and skirtboard attachments, impact-zone crossmembers, and take-up frames.
One hairline crack at a single weld toe on a sound frame is a repair. Grind it, re-weld it, add material to kill the stress riser. Cracks at several load points along the same frame mean the structure is cycling past its design load, and every crack you chase brings another a few feet away.
3. Deflection Under Load
Watch it running loaded, ideally through a surge. Some movement is normal in a long span; what matters is whether it recovers instantly. A frame that visibly flexes or pumps under a normal load is undersized. On a troughed idler conveyor, belt sag between idler sets is normally held near 2 percent of the idler spacing. More than that means low take-up tension, spacing too wide, or a structure sagging with it.
4. Bearings and Shafts
Hot, growling, or squealing bearings mean poor lubrication, contamination, or internal damage. Pull the covers: darkened or gritty grease means contaminant got past the seals. Blown seals often trace back to over-greasing, which pressurizes the housing and pushes the seal out. Reddish-brown powder around a housing is fretting. A cracked cast housing is finished.
Then the shafts. Look for a bent shaft, a wallowed keyway, or a shaft worn undersize where a bearing has been spinning. A shaft that flexes under belt tension misaligns the bearings at both ends. All of it is repairable on a sound frame; our guide to conveyor drive and bearing specs covers what to put back in.
5. Pulleys and Lagging
Lagging raises the friction between belt and drive pulley, and it is a wear part. Worn smooth or torn off in strips, the drive slips and everything downstream gets blamed for it. Re-lagging is routine; ceramic lagging is the answer when rubber keeps slipping or wearing out early in wet, abrasive service. On the pulley, look for a dished or grooved shell, a crown worn flat, and cracking at the end discs. Pulleys are replaceable parts, almost never a reason to condemn a machine.
6. Belt Condition and Splice Count
Once the top cover has worn through and the carcass is showing, the belt is finished. Exposed carcass takes on moisture, frays, and delaminates. Hardened rubber, plies separating or blistering, and chronically frayed edges say the same.
Then count the splices and ask how often they have been redone. A belt that keeps failing at or beside the splice is telling you the carcass around it is fatigued, and the next splice lands in the same tired material. Get a replacement belt. Belt strength is rated in PIW, pounds per inch of width, and running over the rated working tension produces exactly that pattern. If tension is right and it still keeps failing, the belt was underspecified.
7. Tracking History
Ask maintenance how often they re-track this belt. One that gets centered and then holds there had a tension, alignment, or belt problem, and all three are fixable. One that drifts back off center within days of every adjustment is usually structural. A warped or racked frame, or one on a settled leg, will never let a belt track. Chronic edge-rub on the frame confirms it, and it eats belt edges fast.
8. Wear Liners, Bed Slats, and the Load Zone
The load zone takes the worst abuse and is the most rebuildable part of the machine. Abrasion-resistant plate is sacrificial: AR400 is graded by hardness rather than chemistry, typically 360 to 444 Brinell, which is why it is the normal liner choice for chutes, hoppers, and bins. A liner worn through into the steel behind it did its job. The question is whether that steel survived. Same on a Remcon slider bed conveyor, where the bed is replaceable 3/8-inch flat-bar slats inside a formed 3/16-inch plate steel frame, so the wearing surface renews without touching the frame.
Repair or Replace: The Triggers
Line your findings up against this table. One replace-side finding on its own is worth a second look. Several together, especially in the frame, is your answer.
| What you found | What it means | Verdict |
|---|---|---|
| Top cover worn through to the carcass | Belt at end of life; frame unaffected | Repair — new belt |
| Splice failing repeatedly in the same belt | Carcass around the splice is fatigued | Repair — new belt, not another splice |
| Bed slats or wear liners worn through | Sacrificial parts did their job | Repair — reline it |
| Bearings hot, noisy, or contaminated | Lubrication or sealing failure | Repair — bearings, seals, and the cause |
| One hairline crack at a single weld toe | Local stress riser | Repair — grind, re-weld, reinforce |
| Belt drifts off center within days, every time | Frame racked, twisted, or on a settled leg | Check the structure before the belt |
| Frame rusted thin at a pit line or splash zone | Section gone where it stays wettest | Replace the section, keep the machine |
| Cracks at multiple welds and load points | Structure cycling past its design load | Replace |
| Permanent bow in a stringer, belt empty | Steel has yielded | Replace |
| Frame visibly flexes or pumps under load | Built too light for the material | Replace |
The Middle Answer: Replace the Section, Not the Machine
Conveyors rarely wear out evenly. The in-ground section rots while the incline above stays clean. On a two-conveyor baler feed line, Remcon found the in-ground portion of the first conveyor badly rusted from sitting underwater much of its life. Instead of replacing the machine, we fabricated a new in-ground section in the shop and fitted it to the existing above-ground portion on site, while both conveyors got new belts, drive components, and wear parts. That is also how a conveyor gets lengthened, re-angled, or moved — see system reconfiguration and moving.
What a Rebuild Should Include
If the frame passes, do the rebuild properly. Working components have improved over the last 10 to 20 years and a shutdown is the cheapest time to capture that: better bearings, a current gear reducer, a more durable belt, a VFD for soft start and jam protection instead of shear pins. Belt replacement and repair is usually the anchor job, and the rest gets scheduled around it.
A rebuild should also fix the cause, not the symptom. Remcon looks for what produced the wear and changes the design so it does not come back: a solid bed converted to a slat bed so dirt stops packing under the belt, a gear reducer remounted so the drive line aligns.
Quotes to Be Careful With
Two quotes should slow you down. A new-equipment quote written without anyone inspecting the existing frame, because that vendor cannot know whether you need it. And a rebuild quote priced only on the parts you pointed at. If nobody looked at the stringers, the weld toes, and the legs, the change order arrives once the machine is apart. Our guide on how to buy a conveyor has the rest of the questions.
Remcon has built heavy-duty recycling equipment since 1977, and we rebuild machinery other manufacturers built as readily as our own. Send photos of the frame, the tail section, the load zone, the legs, and any cracking, with what the machine handles now versus when it went in. If the frame is sound we will say so, and quote wear parts instead of a new conveyor.
Repair or Replace a Conveyor FAQ
Should I repair or replace my conveyor?
Repair when the frame is sound and what is worn is wear parts: belt, idlers, bed slats, liners, lagging, bearings. Those are consumables and replacing them on a good frame is cheap. Replace when the frame itself is undersized or cracking at multiple load points, because no belt fixes a structure built too light for the load. The test is the frame, not the age of the machine.
My conveyor frame is cracked. Can it be repaired?
It depends on how many cracks and where. In welded steel structures, fatigue cracks typically start at weld toes, because those are stress concentrations. One hairline crack at a single weld can be ground out, re-welded, and reinforced. Cracks appearing at several welds and load points along the same frame mean the structure is being loaded past its design capacity, and repairing them one at a time only moves the next crack a few feet down the run.
How do I know if my conveyor is worth rebuilding?
Check four things. With it running loaded, watch whether the frame visibly flexes or pumps under a normal load. Then lock it out and check three more: whether any stringer holds a permanent bow with the belt empty, whether the frame diagonals still match, and whether cracks show at more than one weld or load point. Clean on all four and it is worth rebuilding. Two or more failures and you are buying time.
Is refurbishing a conveyor cheaper than buying new?
Often, when the frame is sound, because you are paying for wear parts and labor instead of a new structure. There is no fixed percentage rule that decides it. Cost depends on how much steel gets replaced, how much work happens on site versus in the shop, and how long the line can be down. Remcon builds to order and quotes repair and replacement per job.
How many times can a conveyor belt be spliced?
There is no fixed number, but the belt tells you when it is done. Every endless belt carries at least one splice, and a second from a field repair is common. When a belt keeps failing at or beside the splice, the carcass around it has fatigued and a new splice lands in the same tired material. Replace the belt then, and check that its PIW rating, pounds per inch of width, matches the tension the conveyor develops.
Why does my belt keep mistracking after every adjustment?
Because the cause is probably not the belt. A belt that drifts back off center within days of every adjustment usually has a structural cause: a racked or twisted frame, a settled leg, or a pulley no longer square to the conveyor centerline. Tracking adjustment treats the symptom, so the drift comes back. Measure the frame diagonals first. If they do not match, the frame is out of square, and no belt adjustment will hold.