2-13. Installing Boarding Ladder (cont'd.)
b. To install, first turn left latch handle (1) to right and right latch handle (2) to left.
c. Insert ladder ends into holes provided in bracket below each door.
d. To lock ladder in position, turn left latch handle (1) to left and right latch handle (2) to right.
2-14. Air Reservoir Drain Cock
a. The hand operated drain cock (2) is located at center and bottom of air reservoir (1).
Wear goggles when opening drain cock. Failure to do so could result in serious eye injury.
XM1063 has three air reservoir drain cocks. M129A4
has two air reservoir drain cocks. Be sure to open/
close all drain cocks.
b. Turn drain cock counterclockwise to open to drain moisture
and to release air pressure if brakes lock. Turn clockwise to
c. Open drain cocks if semitrailer is to remain inactive for any
length of time.