TM 5-3895-373-34 2.51 ADJUST UNLOADING AND RELIEF VALVES - Continued. B. ADJUST Continued. 6. ADJUST TOW POINT CONTROL VALVES. NOTE This   procedure   applies   to   both   left hand and right hand tow point control valves. a. Remove cap nut (23). CAUTION Use    caution    when    removing    seals and preformed packings.  Do not use excessive force when removing seals and  preformed  packings.    Use  an  o- ring tool to remove seals and preformed packings. b. Use an o-ring tool to remove preformed packing (24) from cap nut (23). c. Remove self-locking hex nut (25). d. Use an o-ring tool to remove preformed packing (26) from self-locking hex nut (25). e. Turn adjustment screw (27) clockwise to increase   valve   setting   or   counterclockwise   to decrease valve setting. f. Set  tow  point  control  valve  (28)  to  1500psi (10 343 kPa). WARNING Hydraulic oil can be moderately flammable and can  be  an  irritant to the skin, eyes, and preformed packings     will     cause     leakage     and affect     respiratory     system.          Avoid prolonged  exposure.    Eye  protection and    rubber    gloves    must    be    worn when working with hydraulic oil. g. Lubricate  preformed  packings  (24  and  26)  with clean hydraulic oil. h. Install preformed packing (24) onto cap nut (23). i. Install  preformed  packing  (26)  onto  self-locking hex nut (25). CAUTION Be  careful  not  to  damage  preformed packings  when  sliding  over  threads. Sharp   edges   of   threads   can   cut   or damage preformed packings. Damaged    preformed    packings    will cause leakage and affect. j. Install  self-locking  hex  nut  (25)  onto  tow  point relief valve (28). k. Recheck pressure setting. l. Install cap nut (23).  Tighten cap nut. END OF TASK 2-688