TM 9-2330-211-14&P
2-2.
CONTROLS AND I NDICATORS (Con't)
KEY
CONTROL OR INDICATOR
FUNCTION
21
Kingpin
Attaches to fifth wheel of tractor. Reversing kingpin provides either a
2 , or 3 In. (6.4 or 8.9 cm) connection to the fifth wheel of tractor.
KEY
CONTROL OR INDICATOR
FUNCTION
22
Dolly Air Couplings
Located at rear underside of gooseneck.
Connect service and
emergency air lines from dolly to semitrailer.
23
Ball Valves
Located In gooseneck well.
Shut off air lines to dolly when hose
couplings are disconnected.
24
Dummy Couplings
Cover dolly air couplings when not coupled to dolly.
Keep foreign
matter out of semitrailer air lines.
TA506792
2-5