Check hose or hose assembly installations carefully. Proper routing and clamping in accordance with applicable MIM is mandatory. If retaining wires on swivel nuts are backed out, replace the hose assembly. Look for kinks or twists. Observe lay line, if possible. A kinked hose or hose assembly must be replaced. A twisted hose or hose assembly may be relieved by loosening clamps and swivel nuts, and then straightening the hose by hand. Retorque the swivel nuts and tighten the clamps. A preformed hose, or hose assembly, may have a smaller bend radius. Do not attempt to straighten preformed hose or hose assemblies. Excessive bends or signs of chafing may be due to loose, oversize, or worn clamps. Replace oversized or worn clamps, and tighten the clamp without squeezing the hose.

You should check the clamps to make sure they are the correct type and size, that the position of the hose is correct within the clamp, and that the cushion material is positioned correctly. Reposition hose and clamps as needed. Cushion material should NOT lodge NOT between end tabs of a closed clamp. Do use clamps with fuel-resistant cushioning unnecessarily, as this type of cushioning material deteriorates rapidly when exposed to air.

Hose or hose assembly removal procedures must include contamination control procedures as well as actual removal procedures to prevent contamination to the opened system.

Perform contamination control procedures before removing any hose or hose assemblies. You should use approved solvents and clean, lint-free cloths to clean the affected area and wipe down fittings to remove excessive contaminants. Use a suitable container to catch spilled fluid. Have replacement hose, hose assemblies, or protective closures on hand for installation when you disconnect hose or hose assemblies. If hose replacement is not practical, cap or plug hose or hose assembly ends immediately after disconnecting.

Once contamination control has been accom-plished, you can begin removal of hose and hose assemblies. Remove all supporting clamps from hose or hose assembly. Remove lockwire (if present) from swivel nuts. Turn swivel nuts only to disconnect hose assembly. Loosen nuts carefully to avoid damage. Disconnect the hose assembly by using two open-end wrenches. One is to grip and prevent turning of the fitting to which the hose assembly is connected, and the other is to loosen the swivel nut. Hose and hose assemblies (particularly Teflon) have a tendency to become set to shape in service. Some Teflon hose assemblies are deliberately preformed during the fabrication process. Do not attempt to straighten a preformed hose. Protect the preformed areas from distortion by a restrainer. The restrainer may be of wire, metal, plastic forms, or any other suitable device to retain the preformed configuration. Install the protective closures to seal open parts of hydraulic lines and ends of removed hose or hose assemblies.