TM 10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE. 12-18. Oscillation Cylinder (S/N 2001 and above). (Sheet 3 of 10) REMOVAL 6. Attach hoist and sling to barrel (13) on  cylinder  assembly  (11). Remove slack from sling. 7. Using a hammer and wooden dowel, remove two pins (10). Drive  pins (10) out, using care not to damage pins (10) or fittings (25). 8. Using a hoist and sling, remove cylinder  assembly  (11)  from  mounting brackets. For convenience, lower cylinder  assembly  (11)  onto  suitable repair stand or work  bench  with padding. 9. Remove hoist and sling. DISASSEMBLY 10. Using a strap wrench, (12) from barrel (13) assembly (11). NOTE remove collar from  cylinder Observe positioning of seals, wipers  and  packings  when  removing them. Record positioning, as necessary,  for  proper  assembly. 11. Using a rubber mallet, remove 14 thru 24 as an assembly from (13). items barrel Go to sheet 4 12-162