The parts that stop plants
An asphalt plant rarely stops because a big component fails. It stops because a small wear part runs out and there is no spare on site. The parts below take the abrasion of hot aggregate, heat and vibration, and are the ones to plan for.
| System | Wear parts | What wears them |
|---|---|---|
| Twin-shaft mixer | Liners, paddles (tips), mixing arms, shaft seals | Hot, abrasive aggregate every batch |
| Drying drum | Flights, combustion-zone flights, drum seals, tyre and trunnion rollers | Aggregate tumbling, heat, misalignment |
| Burner | Nozzles, ignition electrodes, filters, flame sensor | Fuel quality, deposits, heat |
| Hot elevator | Buckets, chain or belt, sprockets | Hot aggregate, load cycles |
| Vibrating screen | Screen meshes, springs, bearings | Hot aggregate impact, vibration |
| Belt conveyors and feeders | Belts, idler rollers, scrapers | Abrasion, spillage, misalignment |
| Baghouse | Filter bags, cages, pulse valves and diaphragms | Temperature, moisture, dust load |
| Bitumen system | Pump seals, valve packings, heating elements | Heat cycles |
| Pneumatics | Cylinders, seals, solenoid valves | Dust and moisture in air lines |
A first-year stock: what to keep on site
The right quantities depend on output, working hours and how abrasive your aggregate is, so we size the list with each plant. A typical first-year stock for a batch plant covers:
- Mixer: one set of liners and one set of paddle tips; a few spare arms
- Drying drum: a set of the fastest-wearing flights; drum seal segments
- Burner: nozzles, ignition electrodes, filters, a flame sensor
- Elevator: a number of buckets and a length of chain with connecting links
- Screen: one set of meshes for the deck that wears fastest
- Conveyors: idler rollers, belt fasteners, scrapers; a spare belt for the critical conveyor
- Baghouse: spare filter bags (a portion of the full set) and pulse valve diaphragms
- Electrics: fuses, relays, contactors, proximity switches, a spare temperature sensor
- Bitumen: pump seal kit and valve packings
Sites close to a major port with fast customs can keep less; remote sites and islands should keep more.
Ordering parts from Roadmixa
- Find the part number in the parts manual supplied with the plant
- Send the plant model and serial number, part numbers, quantities and, if possible, photos
- We confirm availability, price and the fastest shipping method
- Regular orders ship by sea; urgent items ship by air or express courier
For parts for other brands’ plants, send drawings, dimensions or a sample. Many wear parts are standard industry items and can be supplied.
Make parts last longer
| Part | Practice that extends life |
|---|---|
| Mixer liners and paddles | Keep paddle-to-liner clearance within the manual’s range; don’t overload batches |
| Drum flights | Keep the drum aligned; avoid running the drum hot and empty |
| Filter bags | Keep baghouse inlet temperature in range; avoid condensation at start-up |
| Burner nozzles | Filter fuel; heat heavy oil to the right viscosity |
| Belts and rollers | Fix spillage and misalignment early; replace seized rollers at once |
| Elevator chain and buckets | Check tension and lubricate as specified |
Our maintenance checklist sets out daily, weekly and monthly checks. Ask for a spare parts list or quote.
