TM 9-2330-390-14&P4-83. TOP AND BOTTOM BEAMS AND POSITIONING CYLINDERS REPLACEMENT(Con’t).• DO NOT disconnect hydraulic lines and fittings while engine is running or beforehydraulic system pressure has been released. When engine is running, hydraulicsystem is under pressure. Dolly set must be fully lowered to the ground and enginemust be shut down before lines and fittings are disconnected. A line or fittingdisconnected under pressure will explode with great force and cause serious injuryor death to personnel.• Escaping hydraulic fluid under pressure can penetrate the skin, causing seriousinjury to personnel. Relieve pressure before disconnecting hydraulic lines andfittings. Tighten all connections before applying pressure. Keep hands and bodyaway from pinholes and nozzles which eject hydraulic fluid under high pressure. Usea piece of cardboard or paper to search for leaks. If any hydraulic fluid is injectedinto the skin, it MUST be surgically removed within a few hours by a doctor familiarwith this type of injury or gangrene may result.1.Disconnect two hose assemblies (6) from straight connectors (5) at positioning cylinders (2) inside bottombeam (3).2.Remove two straight connectors (5) and preformed packings (4) from positioning cylinders (2). Discardpreformed packings.3.Attach a suitable lifting device to top beam (1) and adjust so that weight of top beam is on lifting device.4-223
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