TM 5-3895-382-24 NOTICE O-ring  seals  (31)  and  (32)  are  different  sizes.    Note  the location of the O-ring seals on the check ball seat prior to removal.  Do not mix during assembly. 22. Remove  check  ball  (29)  and  check  ball  retainer  (30) from the control housing.  Remove O-ring seals (31) and (32) from check ball seat (28).  Inspect the O-ring seals for damage or wear and replace if necessary. NOTE: The   following   steps   are   for   assembly   of   the steering control unit (SCU). NOTICE Be  sure  all  parts  of  the  steering  control  unit  (SCU)  are clean  and  free  of  dirt  and  debris.    Do  not  use  a  cloth  or paper  towel  to  dry  parts.    Lint  or  other  material  can  get into     the     hydraulic     system     and     cause     damage     to components.    Replace  any  parts  that  have  scratches  or burrs that could result in leakage. 23. Install  check  ball  retainer  (30)  in  control  housing  (12). Be sure the retainer is straight and not tilted in the bore. Install check ball (29). 24. Put a thin coat of 1U-6396 Assembly Compound on O- ring seals (31) and (32) and check ball seat (28).  Install the  O-ring  seals  in  their  original  location  on  the  check ball seat.  Using a 1/8" -24 machine screw, install the check ball seat in the center housing. 25. Install set screw (27) and tighten to a torque of  11 N· m (100 lb-in).  After installation, the set screw should be slightly below the outside surface of the center housing. 26. Put  a  thin  coat  of  clean  hydraulic  oil  on  control  spool (19) and control housing sleeve (20).  Install the control spool in the control housing sleeve.  The spool should turn  freely  in  the  sleeve.    Put  the  spring  slots  in  each component in alignment.  Some spool and sleeve sets may have alignment marks on them.  In this case, align the marks.  Install centering spring kit (21).  Be sure the springs are centered.  Install pin (18) that holds control spool  (19)  and  control  housing  sleeve  (20)  together. The pin should be flush on each side of the sleeve after installation. NOTICE When  spool  and  sleeve  assembly  (11)  is  installed  In  the control housing, be sure it is not tilted out of position.  The assembly should be pushed gently Into place with a slight rotating  action,  keeping  pin  (18)  nearly  horizontal.    The spool  and  sleeve  assembly  should  be  installed  until  it  is flush with the meter end of the housing (side with fourteen holes in the end).  Be sure the spool and sleeve assembly turns freely in the center housing. 27. Put the center housing in a vertical position.  Install two bearing races (16) and needle thrust bearing (17). 28. Assemble gland bushing (23).  Install dust seal (24) in seal gland bushing (25) with the flat or smooth side of the   seal   facing   the   bushing.      Turn   the   seal   gland bushing over Install quad ring seal (26) in the seal gland bushing.  Smooth the seal in place with your finger.  Do not  use  a  seal  that  falls  freely  into  the  pocket  in  the bushing. 29. Install gland bushing (23) over the control spool with a twisting motion.  Use a soft faced hammer to seat the gland    bushing    against    bearing    race    (16).        Install retaining ring (22).  Be sure the retaining ring is properly seated. 30. Put the steering control unit (SCU) in a vertical position with the steering column end facing down.  Install O-ring seal (10) in control housing (12). 31. Install spacer plate (9).  Be sure the holes in the spacer plate align with the tapped holes in the control housing. Put   pin   (18)   in   a   horizontal   position   in   the   control housing.  Install drive (8).  Be sure the slot in drive (8) engages with pin (18). 16-19