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Page Title: COUPLING SEMITRAILER TO TOWING VEHICLE- cont
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TM   9-2330-272-14 2-10.   COUPLING   SEMITRAILER   TO   TOWING   VEHICLE   (Con’t). CAUTION b. Use a ground guide during backing operations. Damage to equipment may result if caution is not followed. Aline towing vehicle with semitrailer and slowly back towing vehicle. Stop towing vehicle before its fifth wheel plate (6) contacts upper fifth wheel plate (9) of semitrailer. c.  Remove  dummy  couplings  from  service  air  coupling  (1)  and  emergency  air  coupling  (2)  at  front  of semitrailer.  Connect  towing  vehicle  service  air  hose  to  semitrailer  service  air  coupling.  Connect  towing  vehicle emergency air hose to semitrailer emergency air coupIing. d. Open air shutoff valves on towing vehicle and apply semitrailer brakes. e. Check that kingpin (10) is centered between approach ramps (4). Adjust kingpin height by raising or lowering  landing  gear  legs  (11): (1) Release handcrank (13) from stowage clip (12). (2)  Rotate  handcrank  (13)  clockwise  to  raise  Ianding  gear  legs  (11)  or  counterclockwise  to  lower landing  gear  legs. (3) Stow handcrank (13) in stowage clip (12). f. After kingpin (10) height is properly adjusted, slowly back towing vehicle until coupler jaws (5) engage kingpin. Inch forward to ensure that coupling is locked. If coupling is not locked, rock back and forth until kingpin locks. g. Connect towing vehicle intervehicular cable to semiitrailer receptacle (3). h. Ensure that fifth wheel Iocking plunger lever (8) and safety Iatch (7) are in locked position. TA702646 2-20

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