TM 10-3930-659-20 17-28.  HYDRAULIC OIL SAMPLING VALVE REPLACEMENT. This Task Covers: a. Removal b. Installation Initial Setup: Equipment Conditions: Materials/Parts: • Parking brake set (see TM 10-3930-659-10). •  Rags (Item 27, Appendix C) • Left engine upper sideshield opened (see TM 10- •  Three preformed packings 3930-659-10). References: •  TM 10-3930-659-10 Tools/Test Equipment: • General mechanic's tool kit (Item 44, Appendix F) NOTE A suitable container should be used to catch any draining hydraulic fluid.  Ensure that all spills are properly cleaned. a. REMOVAL 1. Remove hose (5) and preformed packing (4) from tee (3).  Discard preformed packing. 2. Remove tee (3) and preformed packing (2) from tee (1).  Discard preformed packing. 3. Remove  hydraulic  oil  sampling  valve  (8),  special  plug  (7),  and  preformed  packing  (6)  from  tee  (3).    Discard preformed packing. TA707673 17-88