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This SAE Information Report is intended to help promote the proper use of Predictive and Preventive Diagnostic Maintenance in hydraulic systems. This document can be used as a selection guide for the level of diagnostic equipment and methods to specify for a given application. Each application has its own particular requirements.

The procedures and guidelines detailed in this SAE Information Report provide various techniques and processes to properly clean fluid power piping prior to assembly and operation.

This SAE Standard defines the expectations for free-standing, nonintegral, nonpressurized reservoir, flooded inlet type, industrial hydraulic power units used on machine tools and equipment for the automotive industry. These exclude power units used for intermittent and/or noncontinuous duty cycle and pressurized vessels, such as accumulators and air over oil systems. Objectives were set and accomplished to develop a consensus of common features which enhance the power unit performance, manufacturing quality, and maintainability. Some of those features are: a Identification b Common sizes and construction c Conductors and connectors d Pump/motor groups e Filters