TM 10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 12-18. Oscillation Cylinder (S/N 2001 and above). (Sheet 2 of 10) REMOVAL NOTE Tag all hose and tube assemblies before disconnecting to aid in installation. Cap all hose ends to  prevent  contamination. 1. Using a 7/8" open end wrench, disconnect hose assembly (1) and union (2) from cylinder assembly (11) from  vehicle  carriage  assembly. 2. Using a scribe, remove and discard preformed  packing  (3). 3. Using a 7/8" open end wrench, disconnect hose assembly (4) and elbow (5) from cylinder assembly (11). 4. Using a scribe, remove preformed  packing  (6). 5. Using a hammer, 3/4" socket wrench handle, bolts (7), washers (8) (9). and  discard socket and remove  two and anchors Go to sheet 3 12-161