TM 9-2330-359-14&P
2-18. UNCOUPLING SEMITRAILER FROM TOWING VEHICLE.
WARNING
All personnel must stand clear of towing vehicle and semitrailer
operation. Failure to follow this warning may result in serious
personnel.
a. Chock semitrailer wheels.
b. Lower landing gear (6).
during uncoupling
injury or death to
c. Close airline shut-off valves on towing vehicle. Disconnect service air Iine from semitrailer air coupling(l).
Disconnect emergency air line from semitrailer air coupling (2).
NOTE
Step d applies to all models except M872A1.
d. Disconnect 24-volt electrical connector from semitrailer electrical receptacle (4), or disconnect 12-volt
electrical connector from semitrailer electrical receptacle (3).
NOTE
Step e applies only to M872A1.
e. Disconnect 24-volt electrical connector from semitrailer electrical receptacle (3), or disconnect 12-volt
electrical connector from semitrailer electrical receptacle (4).
f.
Push fifth wheel locking plunger (8) forward and slowly drive towing vehicle forward until kingpin plate (7)
clears fifth wheel approach ramps (7).
g. Move towing vehicle a safe distance from semitrailer.
h. Perform all After (A) PMCS in Table 2-1.
TA507994
2-20
