Most conveyor failures announce themselves weeks in advance. A squealing idler, a belt edge kissing the structure, a damp patch of fines under the head pulley — all of it is visible to anyone who walks the conveyor and knows what to look for.
The problem is that nobody walks it. Conveyors run in the background until they don’t.
Here’s a head-to-tail audit that takes about 30 minutes on a typical conveyor and requires nothing but eyes, ears, a flashlight, and a notepad. Do it with the belt running where it’s safe to observe, but keep hands, tools, and clothing well clear of moving components, and never reach past a guard. Anything that requires touching the conveyor waits for lockout.
Start at the tail: loading zone first
Most belt damage and most spillage originates where material lands on the belt, so start there.
- Tail pulley. Look for material buildup on the pulley face and packed material between the belt and pulley. Check that the tail area is clean enough that spillage isn’t being pulled back into the pulley. Confirm the tail guard is in place.
- Skirting. Are the skirt seals actually contacting the belt, or are there daylight gaps blowing dust and dribbling fines? Check for skirt rubber worn to the clamps, and for skirtboard liners grooving the belt — a skirt seal adjusted too hard cuts a trench in the top cover over time.
- Wear liners. Inside the loading chute, are liners intact, or is material wearing through to the chute wall? Holes and gaps here show up as spillage and belt gouging.
- Spillage pattern. Note where material is on the ground. Spillage at the load zone points to skirting or belt sag between idlers. Spillage further down usually means overloading, mistracking, or carryback.
- Impact bed or idlers. Under the load point, look for crushed impact bars, flattened rubber discs, or idlers hammered out of position.
Walk the carry side: tracking and idlers
Walk from tail to head along the carrying run.
- Tracking. The belt should run centered on the idlers, loaded and empty. Note anywhere the belt edge approaches the structure or an idler bracket. Look for polished spots on the frame — shiny steel means the belt has been rubbing there.
- Idlers. Every roll should be turning. A stopped roll under a moving belt is grinding a flat spot on itself and abrading the belt. Listen for growling or grinding bearings; feel for heat only where a guard or safe distance allows. Mark seized and noisy rolls for replacement — don’t just log “some idlers bad.”
- Idler alignment. Rolls knocked out of square steer the belt. Sight down the run and note frames that are visibly cocked or shimmed with debris.
- Belt sag. Excessive sag between idlers at the load area lets material work under the skirts. If you see it, note it against the skirting problems you found at the tail.
Belt condition
You can read most of the belt’s story from one vantage point while it cycles past.
- Edges. Frayed, cambered, or gouged edges usually mean a tracking problem, past or present. Note which edge — it tells you which way the belt has been running off.
- Top cover. Look for longitudinal grooves (skirt or jammed material damage), gouging at the load zone, and general cover wear exposing fabric.
- Bottom cover. Damage here points to material trapped at pulleys or a seized return roll.
- Splices. Watch each splice pass. Mechanical fasteners: look for missing or hooked clips and cracking at the fastener line. Vulcanized: look for edge lifting or cover cracking at the splice line. A failing splice is a downtime event with a date on it — you just don’t know the date.
Head end: cleaners and discharge
- Primary cleaner. Is the blade contacting the belt across the material path? Look at the wear pattern — even wear is healthy; center-only or one-sided wear points to load concentration or mistracking. Check the tensioner is in its working range, not bottomed out.
- Secondary cleaner. Same checks. Also look behind the blades for buildup that’s holding them off the belt.
- Carryback evidence. Look under the first several return idlers past the head. Piles or coated rolls mean the cleaning system isn’t keeping up, regardless of how the blades look.
- Head pulley and snub. Check for material buildup on pulley faces and lagging condition — chunked or missing lagging shows up later as slippage and tracking trouble.
Transfer points and dust
- Stand at each transfer during normal flow. Is dust escaping the enclosure? Where — skirt gaps, chute joints, the entry/exit of the covered section?
- Check chute exteriors for wear-through spots, patches on patches, and washout staining.
- Note any transfer where the material stream hits the receiving belt off-center — that’s a tracking and wear problem being manufactured continuously.
Return run and guarding
Walking back along the return side:
- Return idlers. Same drill: turning, quiet, clean. Caked return rolls confirm a carryback problem.
- Guarding. Every pinch point — head, tail, snub, take-up, drive — should be guarded, and the guards actually in place, not leaning against a leg. Note missing or damaged guards as priority items; they’re both a hazard and a citation.
- Take-up. Check the gravity take-up travel position and that its fall zone is barricaded. A take-up near the end of its travel means the belt has stretched or the tension system needs attention.
- Housekeeping. Piles under the conveyor are data, not just mess. Log where they are and roughly how fast they come back after cleanup.
What to log, and how often
Keep it simple enough that it actually happens:
- One line per finding: conveyor ID, location (idler number or bearing structure reference), what you saw, severity (fix now / fix at next down day / watch).
- Photograph anything you’d struggle to describe — wear patterns especially.
- Track repeat items. A return idler replaced in the same spot twice in a quarter has a root cause upstream of it.
- Frequency: a quick walk weekly, this full audit monthly, and always after a belt change, splice repair, or material change.
The value isn’t any single walk — it’s the trend. When the same conveyor generates more findings each month, you’re watching a failure develop on your own schedule instead of the conveyor’s.
If you’d rather have experienced eyes do the first pass, The ACT Group in Fontana has walked belts at Southern California aggregate, cement, and asphalt plants for more than 30 years. Call us to set up a conveyor walkthrough — we’ll audit head to tail with your team and leave you a prioritized punch list, not a sales pitch.