TM 9-2330-390-14&P4-109. HYDRAULIC LINES REPLACEMENTThis Task Covers:a.Hydraulic Reservoir Outlet-to-Hydraulic Pumpd.Hydraulic Control Valve-to-Hydraulic Lift CylinderInlet Hose Assembly ReplacementHose Assemblies Replacementb.Hydraulic Pump Outlet-to-Hydraulic Control e.Hydraulic Control Valve-to-Hydraulic PositioningValve Inlet Hose Assembly ReplacementCylinder Hose Assemblies ReplacementC.Hydraulic Control Valve Outlet-to-HydraulicReservoir Inlet Hose Assemblies Replacementinitial Setup: Equipment Conditions: • Dolly set lowered (see paragraph 2-8).• Engine starter switch set to OFF position (seeparagraph 2-20).Tools/Test Equipment: Materials/Parts:• Hydraulic fluid (Item 15, Appendix F)• Rags (Item 25, Appendix F)• Marker tags (Item 28, Appendix F)• Masking tape, 2 in. (Item 32, Appendix F) • Locknuts• General mechanic’s tool kit (Item 30, Appendix G)• Tie-down straps• 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.DO NOT allow dirt or dust to enter hydraulic reservoir. Damage to hydraulic system willresult.NOTE• Hydraulic lines should be tagged before removal. Refer to paragraph 4-18 fortagging Instructions. • Hydraulic reservoir, hydraulic pump, hydraulic control valve, and hydraulic cylindersports should be plugged with masking tape or other suitable means as lines aredisconnected or fittings are removed. Refer to paragraph 4-22 for Instructions.4-287
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