8/13/2019 Gearbox Preventive Maintenance is a Priority - Philadelphia Gear - A Timken Brand

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8/13/2019 Gearbox Preventive Maintenance is a Priority - Philadelphia Gear - A Timken Brand

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ther project involved a major city in the Southeastern United States thatusing gas turbine generators to supplement their power grid during timeseak usage. These units, installed nearly three decades ago, had rece ivedlittle maintenance and only periodic oil refills. Because of inadequate

ntenance, the rotating elements, bearings and pinions all suffered fromal fatigue and severe pitting. Ultimately the bearings in one of the unitsd and the subsequent vibration destroyed the gears.

r the gearbox was removed it was sent to a P hiladelphia Gear Regionalice Facility for inspection and cost/benefit analysis. The inspection revealedrepairing the gearing and bearings within the unit would cost $100,000 andup to 20 weeks to repair. The alternative was a new gas turbine that wouldtwice as much as the repair and take 30 weeks to deliver and install. While

problem was one of improper lubrication, vibration caused the mostage.

ablishing a PM Programle identifying the cause of equipment failures can sometimes be as simpleoking closely at the damage, discovering the root cause of such a problemnsiderably more difficult. In some instances plants do not have the

histicated equipment needed to identify shaft vibration anomalies or analyzeamples for foreign materials. However, one solution is outsourcing theentive maintenance (PM) functions. Outsourcing PM allows plants to focusheir own core competencies, the operation of the plant.

en selecting a prev entive maintenance provider, there are se veral keyices that should be included in any agreement. Any agreement shoulder breakdowns, scheduled maintenance, parts reconditioning, serviceades, reverse engineering, alignment and balancing, and on-site or off-sitenostic services. Providers should be thoroughly skilled in performingbox failure root cause analysis.

le identifying the cause of equipment failure is only the first step inblishing an overall preventive maintenance program, it is an important

The information gathered will ultimately serve as the foundation forning future preventive maintenance. Such information will also help avoiding the same mistakes again.

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