TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 206 of 452
COUPLING AND CONNECTING TRACTOR TO TRAILER
WARNING
Ensure no one is standing behind tractor or trailer during the
coupling procedure. Failure to comply may result in serious
injury or death to personnel. Seek medical attention in the
event of an injury.
Ensure the kingpin couples with the fifth wheel. Failure to
comply may result in damage to equipment, and possible
injury or death to personnel. Seek medical attention in the
event of an injury.
CAUTION
Ensure the kingpin does not contact fifth wheel ramps when
coupling. Failure to comply may result in damage to
equipment.
For M915A1 the M967/M969 fuel tankers must be hauled
with fifth wheel placed two notches rearward from HAUL
position. Failure to comply may result in damage to
equipment.
NOTE
Two lamp cables, one 12V and one 24V, are stored in the
tool box under the passenger seat. The cover at either end of
the 24V cable should be locked in the open position, by
sliding the metal tab back, before connecting the lamp cable.
1. Ensure tractor is centered in front of trailer at centerline as shown in figure 6.
2. Back tractor under trailer gooseneck until fifth wheel ramps meet trailer kingpin
in throat of fifth wheel.
3. Stop, shift to neutral (N), and apply parking brake.
4. Verify correct alignment as shown in figure 6.
5. Ensure contact between trailer and fifth wheel ramps. If kingpin is positioned too
high, it will not engage fifth wheel correctly.
6. Connect trailer service and emergency air hoses on tractor pressure couplings.
7. Enter cab and push in trailer air supply control knob and set trailer brake hand
control.
8. Release parking brake control.
9. Shift transmission control lever to reverse (R) and back up until fifth wheel locks
firmly on kingpin.
10. Shift transmission control lever to first gear (1) and pull against load with trailer
brake hand control set. This applies pressure against kingpin and provides a test
to ensure a secure coupling.
11. Set parking and service brakes.
12. Release trailer brake hand control and shift transmission control lever to neutral
(N).
TM 9-2320-273-10
0012
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