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Maintenance performed after a machine has failed to return it to an operating state.

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DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

EROSION

The progressive removal of a machine surface by cavitation or by particle impingement at high velocities.

CATASTROPHIC FAILURE

Sudden, unexpected failure of a machine resulting in considerable cost and downtime.

FERROGRAPHY

An analytical method of assessing machine health by quantifying and examining ferrous wear particles suspended in the lubricant or hydraulic fluid.

DELAMINATION WEAR

A complex wear process where a machine surface is peeled away or otherwise removed by forces of another surface acting on it in a sliding motion.

PREDICTIVE MAINTENANCE

A type of condition-based maintenance emphasizing early prediction of failure using non-destructive techniques such as vibration analysis, thermography, and wear debris analysis.

PROACTIVE MAINTENANCE

A type of condition-based maintenance emphasizing the routine detection and correction of root cause conditions that would otherwise lead to failure. Such root causes as high lubricant contaminant, alignment and balance are among the most critical.

PREVENTIVE MAINTENANCE

Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

PREVENTIVE MAINTENANCE

Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

BACK PRESSURE

The pressure encountered on the return side of a system.
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