TM 10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 12-15. Fork Position Cylinders (S/N 2000 and below). (Sheet 4 of 10) DISASSEMBLY NOTE This  procedure  is  for  maintenance of the  lower  fork  position cylinder. Procedure for the upper fork  position  cylinder  iS identical. 15. Using a strap wrench, remove cap (23) from cylinder shell (24). NOTE Observe positioning of wipers, packings, rings and riders when removing them. Record  position- ing, as necessary, for proper assembly. 16. Remove items 25 thru 37 as an assembly from cylinder shell (24). Go to sheet 5 12-135