Conveyor shafts transmit rotation and torque between drive components and support radial loads at the bearings and trough ends. The shaft integrates with sprockets via a keyed connection, and pulleys mount around the shaft body. At the drive end, the shaft transfers input torque from the motor-gearbox assembly to the sprocket or pulley, moving the belt. At the tail end, the shaft supports the tail pulley under belt tension and maintains tracking.

Shafts occupy three functional positions on a conveyor:

• Drive (head) shaft: Transmits motor torque to the belt via sprocket or pulley. The highest load position on the conveyor.

• Tail shaft: Supports the tail pulley under belt tension. May be configured with take-up travel.

• Take-up shaft: Positions the take-up pulley and absorbs tensioning load as the belt stretches.

Proactive inspection and replacement catch problems before they cascade into pulley, bearing, or frame damage. Inspect shafts during any scheduled downtime that involves removing the tail or head pulley assembly.

Replace the shaft when you find:

• Visible bending or deflection under load

• Journal surface damage, such as pitting, corrosion, fretting, or undersizing from wear, at the bearing seat

• Wallowed or cracked keyways

• Corrosion beyond the surface, particularly in the journal area

• Fatigue cracking, especially at step transitions between turned-down journal diameters and the main shaft body

Don’t weld-repair a damaged shaft journal or straighten a bent shaft. Both compromise the material properties and dimensional accuracy that bearing and sprocket fits depend on.