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Diagnose uneven cement-silo discharge and suspected rat-holing using verified aeration, extraction and material-flow evidence. Includes safe isolation, fault discrimination and OEM-specific return-to-service checks.

A rising pressure reading in a pneumatic conveying line while material throughput drops typically signals a blockage, excessive air leakage, or a change in material characteristics that increases flow resistance. Verify line isolation, inspect for obstructions, check air‑seal integrity, and confirm.

Inspect the rotary airlock rotor clearance by measuring the gap between the rotor vanes and the housing, checking for wear, deformation, and foreign material. Verify that the measured clearance is within the OEM‑specified range, that the rotor spins freely without binding, and that the air‑seal.

If a cement screw conveyor draws higher motor current while the material throughput remains unchanged, the most common causes are increased mechanical resistance (e.g., wear, buildup, mis‑alignment), electrical supply issues, or control system drift. Begin by confirming safe isolation, then verify.

Diagnose a belt conveyor take-up nearing its travel limit under steady load. Check belt elongation, pulley geometry, counterweight movement and mechanical restrictions before adjusting tension or returning to service.

Diagnose apparent calciner fuel-split imbalance by validating feeder measurements, thermal-input basis, combustion-air conditions and CO/O₂ trends before authorizing process changes or isolated inspection.

Diagnose a sustained calciner tertiary-air temperature drop without assuming a dedicated tertiary-air fan. Compare temperature instruments, clinker cooler heat recovery, duct draft and operating conditions before planning safe inspection.

When a cement conveyor belt repeatedly returns to misalignment after a tracking adjustment, the root cause is almost always a combination of mechanical, structural, or process‑related factors that are not addressed by a single belt‑tension or idler‑position change. Follow the seven‑step diagnostic.

A rise in bucket-elevator backstop housing temperature is an observation, not a diagnosis. Depending on the backstop design, normal overrunning losses and heat conducted from the reducer or adjacent bearings may contribute; abnormal friction, incorrect lubrication where applicable, damaged mounting.

Lagging slip on a bucket‑elevator head pulley under load is most often caused by inadequate friction between the lagging and the pulley rim, excessive pulley wear, mis‑alignment, or incorrect belt tension. Verify pulley surface condition, lagging integrity, drive torque, and alignment; then restore.