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Cleaning and Inspection - TM-5-4210-233-14P-1_892
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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Assembly - TM-5-4210-233-14P-1_894
TM 5-4210-233-14&P-1 5-39.  STEERING GEAR-Continued (3)   Inspect the rack piston (46) teeth for cracks and wear.  If you can detect a step by running your fingernail horizontally across the teeth surface, you must replace both the rack piston and sector shaft (2) and use a set of 34 service balls (52). (4)   Inspect the rack piston internal ball-track grooves for brinelling (dents) or spalling (flaking).  If either condition exists, you must replace all of the following parts: the rack piston (46), the worm shaft/input shaft assembly (1), the valve sleeve (37) and the set of 34 balls (52). (5)   Inspect the worm shaft/input shaft assembly (1) ball track grooves for brinelling (denting) or spalling (flaking).  If either condition exists, you must replace all of the following parts; the worm shaft/input shaft assembly (1), the rack piston (46), the valve sleeve (37), and the set of 34 balls. Visually inspect the upper shaft seal area near the input shaft serrations for nicks, and run your fingernail edge across the sealing surface to detect steps.  Visually inspect the sleeve (37) contact area of the worm shaft/input shaft for discoloration from excess heat.  If either of these conditions exist you must replace the worm shaft/input shaft assembly (1) and valve sleeve (37) as a matched set. NOTE The  input  shaft  is  pinned  to  the  worm  shaft  by  the  torsion  bar pin, and the assembly is flexible and may appear slightly bent at this joint.  This slight bend is normal. (6)   Inspect the housing (18) cylinder bore.  You will probably notice normal scoring marks running lengthwise through the bore.  Since this scoring is normal, you should not compare it to the scoring considered detrimental in the cylinder bores of an internal combustion engine. NOTE In running the internal leakage test after reassembly of the unit, make    sure    that    internal    leakage    exceeding    1.0    gpm    (3.8 liters/min.) can only be attributed to the housing and not to the improper  assembly  of  the  new  seals  in  the  worm  shaft,  rack piston,  and  valve  assembly,  before  you  decide  to  replace  the housing. (7)   Inspect the housing (1 8) for nicks that would prevent proper sealing.  Replace the gear housing if these nicks are present and cannot be easily removed with a fine-toothed flat file without changing the dimensional characteristics. WARNING For bearing type with uncaged (loose) rolls do not mix the rolls from   the   side   cover   bearing   with   the   rolls   from   the   housing bearing.      The   bearing   race   and   rollers   are   a   matched   set, interchanging the rolls could result in premature bearing or seal failure, which could cause a loss of power steering. (8)   Inspect the housing bearing and the side cover bearing race and rolls for brinelling or spalling.  If either condition exists, replace the damaged housing bearing (16).  For the housing bearing, follow disassembly step (40) and assembly step (2).  If the side cover bearing is damaged, replace side cover assembly. 5-223

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