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TM 5-4210-233-14&P-1 5-64.  FRONT EXTENSION/RETRACTION CYLINDER - Continued (3) Remove two screws (3) securing counterbalance valve (4) to cylinder and remove O-ring (5).  Discard O-ring. CAUTION Avoid  marring  or  scratching  cylinder  rod  to  prevent  damage  to seal. (4) Using  a  pipe  wrench  unscrew  rod  (6)  from  traveling  block  assembly  (7).    Place  wrench  as  close  to traveling block as possible when removing rod (6). (5) Push rod (6) into cylinder body several inches. (6) Remove two screws (8) and strap (9). (7) Remove snap ring (10) and pin (11) and remove cylinder (2). b. Installation. (1) Install cylinder (2) and secure with pin (11) and snap ring (10). (2) Install strap (9) with screws (8). (3) Clean threads on rod (6) and in traveling block (7).  Apply retaining compound (Item 7, Appendix E) to threads on rod (6) and in traveling block. CAUTION Avoid  marring  or  scratching  cylinder  rod  to  prevent  damage  to seal. (4) Install rod (6) in traveling block (7).  Place pipe wrench as close to traveling block as possible when threading in rod (6). (5) Install new O-ring (5) and secure counterbalance valve (4) to cylinder (2) with two screws (3). (6) Install hydraulic line (1) on cylinder (2). (7) Extend and retract ladder several times to bleed air from system (see para 2-14). (8) Check for leaks and tighten fittings as necessary. (9) Check oil level in hydraulic oil tank.  Fill tank as necessary (see para 5-48). c. Follow-on Maintenance. (1) Retract and bed ladder (see para 2-14). 5-361

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