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1-57 SERVICE VERTICAL HINGE PIN OIL TANKS
1-57 SERVICE VERTICAL HINGE PIN OIL TANKS    (Continued) - TM-55-1520-240-23-1_250

TM-55-1520-240-23-1 UH-1H/V and EH-1H Aircraft Manual
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TM 55-1520-240-23-1 1-57 SERVICE VERTICAL HINGE PIN OIL TANKS    (Continued) 1-57 CAUTION Under normal conditions rotary heads shall be serviced with only one type of oil (E254 or E254.1).  Oil (E254) must be used for temperatures below -25  F (-32  C) . NOTE Procedure is same to service vertical hinge pin oil tanks on any pitch varying housing.  Upper and lower tanks are connected by manifold tube and are serviced together. 1. Position blade (1) to level sight indicators (2). Tie down one forward and one aft blade (1). WARNING Prolonged oil leakage can damage finish and create a work hazard by making the fuselage slippery.  It can also affect other systems in the helicopter.  Therefore, good judgment must be used when determining allowable leakage. NOTE If oil level in sight gage drops from full (half-way) mark to bottom of glass in two hours of operation, leakage is too great.  Check for source of leakage. Repair as required. 2. Check oil level in two sight indicators (2). 3. Remove lockwire.  Remove two filler/drain plugs (3) and packings (4) from upper tank (5). 4. Service tank (5) until oil reaches center of sight indicators (2).  Use lubricating oil (E254 or E254.1) and funnel. Wear gloves (E184.1). 5. Install packings (4) and plugs (3).  Torque plugs to  85 inch-pounds. 1-222







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