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 210 of 452
UNCOUPLING AND DISCONNECTING TRACTOR FROM TRAILER
CAUTION
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.
1. Shift transmission control lever to neutral (N) and apply parking brake. Verify
that parking brake indicator lamp comes on. This prevents tractor from running
out from under trailer when unlocking fifth wheel.
2. Pull out trailer air supply valve.
3. Leave cab and block trailer wheels with chocks.
4. Lower trailer landing gear until bases or wheels touch ground. Turn crank two
more revolutions so when trailer is uncoupled, it will not drop down sharply and
will be nearly level.
5. Disconnect and secure trailer service and emergency air hoses and lamp cable(s).
6. Unlock fifth wheel by first pulling primary lock release handle and then secondary
lock release handle.
CAUTION
Do not pull all the way out from under the trailer until
verifying the landing gear will support the trailer. If it
collapses, the rear frame area of the tractor will be able to
catch the front of the trailer before equipment damage
occurs.
7. Enter cab and slowly pull tractor forward until trailer kingpin is free from lock
guard and landing gear is supporting trailer weight. Stop the tractor.
8. Have crew member observe trailer kingpin to ensure it clears properly during
separation. Ensure kingpin clears tractor rear frame crossmember when pulling
tractor out from under trailer.
9. Pull tractor slowly forward, allowing the trailer gooseneck and kingpin to
completely clear the rear frame area of tractor.
TM 9-2320-273-10
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