TM 10-3930-659-20 CHAPTER 19 NONELECTRICAL GAGES MAINTENANCE 19-1. HYDRAULIC OIL LEVEL SIGHT GAGE REPLACEMENT. This Task Covers: a.  Removal b. Installation Initial Setup: Equipment Conditions: Materials/Parts: • Hydraulic  reservoir  drained (see LO • Two preformed packings 10-3930-659-12). • Four lockwashers Tools/Test Equipment: References: • General mechanic's tool kit (Item 44, • LO 10-3930-659-12 Appendix F) a. REMOVAL Remove  four  screws  (1),  lockwashers  (2),  spacer  plate  (3),  window  (4),  and  two  preformed  packings  (6)  from hydraulic reservoir (5).  Discard lockwashers and preformed packings. TA706780 19-1