2-24. UNCOUPLE FROM TRUCK (ALL EXCEPT M917A1 AND
M917A1 W/MCS) (Cont).
Steps i through m apply to M915A2.
Pull secondary lock release handle (4) out and lift to engage catch.
Pull primary lock release handle (3) out.
Release parking brake and slowly pull forward until trailer clears fifth
Stop and set parking brake.
Pull trailer air supply valve OUT and disconnect and secure trailer air
hoses and cables.
Steps n through q apply to M916A1 and M916A2.
Pull secondary lock release handle (1) out and raise to engage
hooks on fifth wheel housing.
Pull primary lock release handle (2) out and hook on fifth wheel
Secure trailer with winch cable (paragraph 2-28) to prevent trailer
from pushing tractor from beneath it.
Slowly pull truck forward until semitrailer is supported by landing