TM 10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 12-17. Oscillation Cylinder (S/N 2000 and below). (Sheet 2 of 8) REMOVAL NOTE Tag all hose and tube assemblies before disconnecting to aid in installation. 1. 2. 3. 4. 5. Using a 7/8" open end wrench, disconnect hose assembly (1) and union (2) from cylinder assembly (11) from  vehicle  carriage  assembly. Using a scribe, remove and discard preformed  packing  (3). Using a 7/8" open end wrench, disconnect hose assembly (4) and elbow  (5)  from cylinder assembly (11). Using a scribe, remove and discard preformed  packing  (6). Using a 3/4”   socket and socket wrench handle, remove two screws (7), washers (8) and anchors (9). Go to sheet 3 12-153