1. HPU FILTERS LOW PRESSURE FILTER FROM APU UNIT. CLOSE APU HYDRAULIC FLUID VALVE. FILL FILTER WITH HYDRAULIC FLUID PRIO TO INSTALLATION. LUBRICATE GASKET RING WITH OIL.

2. HPU FILTERS 1. OBTAIN CLEAN HYDRAULIC OIL FROM 50 GALLON TANK. 2. FILL APU UNIT TO FULL 3. VERIFY FULL LEVEL ON GAUGE IN FRONT OF APU UNIT APU HYDRAULIC OIL FILLING PROCEDURES

3. HPU FILTERS CLOSE APU HYDRAULIC FLUID VALVE. 1. REMOVE PLUG FROM HIGH PRESSURE FILTER CASING AND DRAIN FLUID INTO A BUCKET. 2. REMOVE FILTER FROM CASING. 3. REPLACE FILTER, CHECK O-RING ON CASING. 1 2 3