5 Signs Your Screw Conveyor Hanger Bearing is About to Fail

In bulk solids conveying, screw conveyors rely heavily on hanger bearings to keep the long rotating screw aligned. Operating directly inside the flow of abrasive powders like cement, fly ash, and sand, these bearings face continuous friction and contamination. Catching hanger bearing failure early is the difference between a quick 30-minute scheduled maintenance and a catastrophic, multi-hour plant shutdown.

UNUSUAL NOISE (GRINDING OR SQUEAL)

A healthy hanger bearing operates with a predictable, low-level mechanical hum.

• The Warning Sign: High-pitched squealing or harsh metal-on-metal grinding noises coming from inside the conveyor trough.

• The Cause: The internal self-lubricating material has completely worn down, or fine abrasive particles have penetrated the bearing interface, creating intense friction against the rotating shaft.

EXCESSIVE TROUGH VIBRATION AND SHAFT WOBBLE

When hanger bearings lose their structural tolerances, they no longer support the screw shaft centrally.

• The Warning Sign: Visible shaft deflection, violent conveyor trough vibration, or erratic screw rotation.

• The Cause: Asymmetric bearing wear creates “play” around the journal. This shaft wobble creates uneven material flow, placing immense stress on surrounding seals and downstream flow components like powder butterfly valves.

LOCALIZED OVERHEATING ALONG THE CONVEYOR TROUGH

While material friction generates some heat, excessive temperature spikes at specific hanger locations signal immediate danger.

• The Warning Sign: Trough casing feeling excessively hot to the touch directly above a bearing support position.

• The Cause: Extreme friction caused by improper material selection or material buildup around the hanger. If left unchecked, this heat can distort the conveyor trough or cause thermal degradation in nearby elastomer seals.

UNEXPLAINED MOTOR CURRENT SPIKES (AMPERAGE DRAW)

Your conveyor drive motor has to work significantly harder when internal mechanical resistance increases.

• The Warning Sign: The control panel shows elevated electrical amperage, or the overload relay trips frequently during standard loading.

• The Cause: A seizing hanger bearing acts like a brake on the rotating screw. This added resistance forces the motor to draw more power to maintain throughput.

POWDER LEAKAGE AROUND ADJACENT VALVES AND SEALS

Hanger bearing failure rarely stays isolated—it triggers a chain reaction throughout the powder handling line.

• The Warning Sign: Dust escaping around the inlet/outlet flanges or premature wear on connected valve diaphragms.

• The Cause: When shaft misalignment occurs, material backs up into the discharge hopper. This compacts powder into tight mechanical gaps, damaging delicate iris diaphragm valves and compromising dust-tight sealing.

## HOW TO PREVENT CATASTROPIC HANGER BEARING FAILURES

1. Switch to High-Wear Materials: Replace standard bearings with advanced wear-resistant polyurethane or self-lubricating polymer compounds that absorb particle impacts.

2. Optimize Powder Fluidity: Use silo aeration pads to prevent compacted material bridges that force heavy, uneven loads onto conveyor screws.

3. Source Compatible Components: Utilizing a one-stop optimal matching solution for cement silos ensures that your conveyors, valves, and monitoring accessories are engineered to handle the same abrasive duty cycles.

PROTECT YOUR CONVEYOR LINE WITH AKMK

Since 2012, AKMK has provided heavy-duty accessories engineered for demanding bulk solids handling operations. Whether you need custom wear-resistant components, replacement valves, or complete silo discharge accessories, we build reliability into every layer of your production.

Hearing strange noises from your screw conveyor? Contact AKMK today for technical support and high-performance replacement components.