When removing the front platform on unit A, refer to paragraph 4-12 and remove switch box.
Remove two hex nuts (8, figure 4-21), flat washers (2), two lock washers (7), and two screws (1)
that secure the two switch box supports (3).
Remove fifteen self-locking nuts (9), thirty-six flat washers (6 and 10), and fifteen screws (5) that
secure the platform (4) to the trailer. Discard self-locking nuts.
Three flat washers (10) are used under the platform on each side, to shim the
Remove front platform.
Position new front platform (4) on the trailer over mounting holes.
Install fifteen screws (5), thirty-six flat washers (6 and 10), and fifteen new self-locking nuts (9) to
secure platform (4).
When replacing front platform for Unit A, refer to paragraph 4-12 and install switch box assembly.
Install two screws (l), new lock washers (7), four flat washers (2), and two nuts (8), that secure
switch box supports.