Used Conveyor Inspection Checklist: What to Check Before You Buy

Buying used · 8 min read

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A used conveyor looks like the simplest machine on the lot: a frame, a belt or chain, and a motor that moves material from one place to another. But conveyors live a hard life. Fertilizer eats steel, grain dust packs into every bearing, and a belt that tracks straight when empty can wander badly under load. A conveyor that stops in the middle of load-out stops everything behind it, so it pays to inspect one properly before you buy.

The frame: straight, square, and solid

Start by standing back and sighting down the length of the conveyor. The frame should run straight, with no sag in the middle and no twist from end to end. A frame that has been overloaded or dropped will show it as a bow or a kink, and a bowed frame makes belt tracking a permanent fight.

Walk the frame section by section and look at the welds, especially where cross members meet the side rails and where the undercarriage or support legs attach. Cracks at welds, fresh paint over one section, or plates bolted over a joint all tell you the frame has been repaired. A repaired frame is not automatically a bad buy, but you want to know what broke and why before you decide.

Check the undercarriage, wheels, and support legs. Wheels should turn freely, tires should hold air and show no deep sidewall cracking, and the hitch or tow eye should be straight with no wear that lets the pin slop around. Legs and jacks should extend, lock, and hold the conveyor level.

Fertilizer corrosion: the quiet killer

If the conveyor moved fertilizer, corrosion is the first thing to check, before the belt and before the drive. Fertilizer residue holds moisture against steel, and it attacks exactly the places that matter: the underside of the frame, the inside of the hopper, the trough or tube, and every bolted joint.

Look underneath, not just at the sides. Poke at soft-looking spots with a screwdriver handle; solid steel rings, thinned steel thuds or gives. Check the hopper seams and the discharge spout, where material sits and moisture collects. Look at bolt heads and fasteners: fasteners that are rusted solid tell you the machine has not been washed down or serviced regularly, and they make every future repair harder.

A conveyor that was washed down after fertilizer use and stored under cover shows it. One that was parked dirty in the yard shows that too, in the frame, the bearings, and the belt.

The belt: wear, splices, and tracking

The belt is the wearing part, so inspect it the way it works: along its full length, on both sides, and at every joint.

Run your hand along the carrying surface and look for thinning, cracking, cuts, and patches. Cracks across the belt, especially near the edges, mean the cover is aging out. Deep cuts that reach the carcass let moisture and material into the belt's core, and they grow. Patches are worth noting, but a belt with patches all along its length is a belt near the end of its working life.

Check every splice. Mechanical splices should sit flat, with all fasteners present and tight, and no fasteners pulling through the belt. Vulcanized splices should be smooth, with no lifted edges or cracks where the splice meets the belt. A splice that catches your finger as you run your hand over it will catch on rollers and cleaners too, and it is the most likely place for a belt to fail under load.

Look at the belt edges. Frayed or chewed edges mean the belt has been running out of alignment and rubbing the frame.

Finally, check tension and take-up. The take-up should have travel left in both directions. A take-up run all the way to the end of its travel means the belt has stretched about as far as it can, and the next adjustment is a new belt or a cut-and-resplice.

Rollers, idlers, and bearings

Rollers and idlers carry the belt and the load, and they fail quietly. Turn every roller and idler you can reach by hand, with the power off and locked out. Each one should spin freely and smoothly. A roller that does not turn, turns roughly, or wobbles on its shaft is dragging on the belt and wearing it from underneath.

Listen as you turn them. Grinding, rumbling, or a dry squeak points to a bearing that is done. Check for grease zerks that are broken off or painted over; a bearing that cannot be greased has not been greased. Look for material packed around the roller ends and bearing housings. Packed dust and fertilizer hold moisture against the bearing seals and shorten their life.

The drive: motor, gearbox, and belts

The drive is what you test under load, but you can learn a lot standing still first. Check the motor for a readable nameplate, intact cooling fins, and no signs of overheating such as discolored paint or a burnt smell. The motor mount should be solid, with no cracked feet and no shims stacked up to make up for a bent base.

If the drive runs through a gearbox, check the oil level and condition. Pull the plug or sight glass: oil that is milky means water has gotten in, and oil full of metal flakes means gears or bearings are wearing. Rock the input and output shafts and feel for play in the bearings.

If the drive uses belts and pulleys, look at belt condition and alignment. Cracked, glazed, or frayed drive belts slip under load, and pulleys that are not aligned wear belts fast. The guard over the drive belts and couplings should be complete and secure. Missing guards are a safety problem, full stop, and they also tell you how the machine was maintained.

Check the electrical side: the starter or switch, the cord or wiring, and any emergency stop. Wiring should be intact, with no chafing where it passes through the frame and no green corrosion at connections. Cycle the switch a few times; it should engage cleanly every time.

Hopper, discharge, and spout

The hopper is where material enters, and it takes the most impact. Look inside for dents, worn-through spots, and buildup. Heavy buildup changes how material flows and hides corrosion underneath, so scrape a spot or two and look at what is under the scale.

Check the discharge end and the spout. The spout should swing or adjust freely and lock in position. Look for wear where material changes direction, especially at elbows and at the bottom of the spout; that is where abrasive material does its damage first. If the conveyor has a belt cleaner or scraper, check that it contacts the belt evenly and is not worn down to its holder.

The live run test

A conveyor that looks fine standing still can still fail under load, so run it if you can, with material in it.

Watch the belt from the side as it runs. It should track centered on the rollers without wandering to one edge. A belt that drifts under load but runs straight empty usually has a frame, roller, or loading problem, not a belt problem. Listen for bearing noise, belt slap, and squealing that only shows up when the conveyor is working.

Watch the discharge. Material should flow steadily, with no surging or spilling off the sides. Surging usually means the belt is slipping on the drive pulley or material is bridging in the hopper. Check the drive under load: a motor that labors, a gearbox that runs hot, or belts that squeal all point to a drive that is undersized for the load or worn out.

Run it long enough to warm up. Ten seconds will not show you a bearing that only complains after ten minutes, or a belt that only wanders once it is carrying a full load.

Records to ask for

Ask for maintenance records: belt replacements and splices, bearing and roller work, gearbox oil changes, and motor work. Ask what material it moved, because a conveyor that ran fertilizer its whole life wears differently from one that ran grain. Ask how it was stored and whether it was washed down after fertilizer use. A conveyor with a clean, inside life shows it in the frame and the bearings. One that was parked dirty tells you that too, and the belt, the rollers, and the drive will confirm it.

Walk the frame, check the corrosion, work the belt and every roller by hand, and run it loaded before you buy. A conveyor that passes all four is a machine you can put to work the day you bring it home.