necessary, while component repair is in process.Metallic wipers are formed in split rings for ease ininstallation, and they are manufactured slightlyundersize to ensure a tight fit. One side of themetallic wiper has a lip, which should face outwardupon installation. Metallic wipers must be inspectedfor foreign matter and condition, and then installed bysliding them over the piston shaft in the proper order,as directed by the applicable MIM.The felt wiper may be a continuous felt ring or alength of felt with sufficient material to overlap itsends. The felt wiper should be soft, clean, and wellsaturated in hydraulic fluid during installation.Protective ClosuresContamination is hazardous and expensive. Toprotect hydraulic systems from contaminants, useprotective closures.Two types of protective metalclosures are approved for sealing hydraulicequipment. They are caps and plugs conforming toappropriate military specifications. Guidelines forselection and use of protective closures for hydraulicequipment are as follows: Use caps and plugs of theproper size and material. Never blank-off openingswith wooden plugs, paper, rags, tape, or otherunauthorized devices.Use closures of metalconstruction conforming to specifications listed intable 2-2 for sealing hydraulic system equipment,lines, tubes, accessories and components.Table 2-2.—Protective Caps and Plugs2-41
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