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Conveyor Pulley / Motorised Drum & Return Idler
Two parts that make a conveyor turn: the motorised drive drum that pulls the belt, and the return idler that carries it back. They are quoted together here
Two parts that make a conveyor turn: the motorised drive drum that pulls the belt, and the return idler that carries it back. They are quoted together here because a drum is ordered against the same belt width and the same tonnage as the return side, and because a failed drum is usually found by looking at the belt it stopped.
YTH motorised drum pulley: diameter, belt width and power
| Drum diameter (mm) | Belt width (mm) | Power (kW) |
|---|---|---|
| 320 | 500 / 600 / 800 | 1.1 / 1.5 / 2.2 / 3.0 / 4.0 / 5.5 / 7.5 |
| 400 | 500 / 600 / 800 | 1.1 / 1.5 / 2.2 / 3.0 / 4.0 / 5.5 / 7.5 |
| 500 | 500 | 2.2 / 3.0 / 4.0 |
| 500 | 650 | 5.5 / 7.5 / 11 / 15 |
| 500 | 800 | 18.5 / 22 / 30 / 37 |
| 630 | 650 / 800 | 5.5 / 7.5 / 11 / 15 |
| 630 | 1000 / 1200 | 18.5 / 22 / 30 / 37 |
| 630 | 1400 | 45 / 55 |
| 800 | 800 | 5.5 / 7.5 / 11 / 15 |
| 800 | 1000 | 18.5 / 22 / 30 / 37 |
| 800 | 1200 | 45 / 55 |
| 800 | 1400 | 75 / 90 / 110 / 132 / 160 |
| 1000 | 1000 | 18.5 / 22 / 30 / 37 |
| 1000 | 1200 | 45 / 55 |
| 1000 | 1400 | 75 / 90 / 110 / 132 / 160 |
TD75 return idler set
| Belt width (mm) | Drawing No. | Roller D (mm) | Roller L (mm) | Bearing | A (mm) | E (mm) | H1 (mm) | P (mm) | Q (mm) | Bolt | Bracket thickness (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 500 | TD1C3 | 89 | 600 | 204 | 720 | 760 | 100 | 100 | 60 | M12 | 6.0 | 1.02 |
| 650 | TD2C3 | 89 | 750 | 204 | 870 | 910 | 100 | 100 | 60 | M12 | 6.0 | 1.02 |
| 800 | TD3C3 | 89 | 950 | 204 | 1070 | 1110 | 100 | 100 | 60 | M12 | 6.0 | 1.02 |
| 1000 | TD4C3 | 108 | 1150 | 305 | 1300 | 1350 | 100 | 130 | 80 | M16 | 8.0 | 2.00 |
| 1200 | TD5C3 | 108 | 1400 | 305 | 1550 | 1610 | 100 | 130 | 80 | M16 | 8.0 | 2.00 |
| 1400 | TD6C3 | 108 | 1600 | 305 | 1750 | 1810 | 100 | 130 | 80 | M16 | 8.0 | 2.00 |
Warehouse stock and loading
Photographs taken in our own warehouse: finished jaw plates in stock, packed for export, and loaded for shipment. Stock levels change week to week — ask what is on the floor before you plan a shutdown.
The motorised drum: what is inside it
A YTH motorised drum carries the motor, the coupling and a hardened-tooth planetary gear inside the drum shell. Nothing sticks out, nothing needs a drive guard, and the whole drive occupies the width of the pulley - which is why it is the default on mobile and compact plants, and why it survives a dusty site where an exposed chain drive does not.
The gear is the part that decides the life. Hardened-tooth planetary gearing runs quietly and takes shock loading from a jaw crusher discharge, and the oil in the drum is its own lubrication system: overfilling and underfilling both end the same way, in a hot drum and a stripped gear.
- Working environment -15 to +43 C; material temperature not above 60 C; site altitude usually not above 1500 m.
- Hydraulic coupling, backstop and brake can be fitted where the conveyor is inclined or has to hold a loaded belt on stop.
- The drum is supplied with a fabricated motor bracket; the customer can also design and make their own to suit the frame.
Why the return side is in this page
The return idlers under a conveyor are the cheapest items on it and the ones most often left out of a spares order. They carry the empty belt, they set the belt line on the way back, and a single seized return idler will pull a belt off-centre faster than any misaligned drum.
The return side is specified by the same belt width as the drum, so both are quoted from one measurement. The second table gives the TD75 return idler set for each width.
Drum versus external drive - the trade
A motorised drum is compact, guarded by design and needs no alignment after installation. An external drive - motor, gearbox, coupling, drive pulley - is easier to repair with site labour and lets you change ratio without changing the drum. On a plant that runs one shift, the drum is the simpler answer; on a plant that runs continuously and keeps fitters, the external drive is easier to keep alive.
Either way the drum diameter is set by the belt: too small a drum and the belt carcass takes more bend cycles per revolution than it was built for.
| Drum diameters | 320-1000 mm |
|---|---|
| Belt widths | 500-1400 mm |
| Power range | 1.1-160 kW |
| Surface speed | 0.25-4.0 m/s |
| Price | USD 100-400 per piece |
Other parts in this group
Independent aftermarket parts supplier. Not affiliated with, endorsed by, or sponsored by Metso, Sandvik or any other original equipment manufacturer. Brand and model names are used only to describe fitment.
Tel / WhatsApp: +86 18616330128 | E-mail: ensaichen@dynamixpower.com