TM 10-3930-659-20 19-1. HYDRAULIC OIL LEVEL SIGHT GAGE REPLACEMENT (Con't). b. INSTALLATION Install two new preformed packings (6), window (4), and spacer plate (3) on hydraulic reservoir (5) with four new lockwashers (2) and screws (1). FOLLOW-ON TASKS: • Fill hydraulic reservoir with hydraulic fluid (see LO 10-3930-659-12). TA706781 19-2