Stirrers, agitators, and gearbox motors are workhorses of the water and wastewater treatment industry. They mix chemicals into solution, keep sludge in suspension, maintain uniformity in equalisation tanks, and support a range of other process functions. They run continuously, often in harsh chemical or biological environments, and when they fail, the process they support can be disrupted quickly. Keeping this equipment in good working order is an operational priority for any treatment facility.

Repair and refurbishment of stirrers and gearbox motors is a practical alternative to outright replacement, particularly for larger or more specialised units where procurement lead times are long and replacement costs are significant. A well-executed repair restores the equipment to reliable operational condition and extends its service life at a fraction of the cost of a new unit.

The repair process begins with a thorough assessment of the equipment to identify the cause of failure and the extent of wear or damage. This is an important step that shapes the scope of repair work and ensures that all issues are addressed, not just the most obvious fault. Common findings include worn or failed bearings, damaged seals allowing liquid ingress, gearbox oil contamination or degradation, worn gear teeth, and electrical faults in motor windings.

Gearbox overhauling involves disassembly, cleaning, inspection of all components, replacement of worn or damaged parts, and reassembly to the original specification. Motor rewinding restores electrical performance where winding insulation has failed or where the motor has suffered thermal damage. Shaft alignment and balancing are checked and corrected before the unit is returned to service.

Performance testing after repair confirms that the equipment is operating correctly before it is returned to service, reducing the risk of repeat failure shortly after reinstallation.