H&S 8200 Series Operator's Manual page 19

OPERATION
BARN DOORS
Barn doors are optional on the Wide Body.
Latches for the doors are located at the
bottom center of the rear doors.
These latches lock in the main apron
chain of the rear drive shaft to hold doors
closed when loading. When the hydraulics
are activated, the main aprons turn, and
the latches flip to open, allowing the rear
door to swing free. Upon completion of
unloading, activate the switch for the rear
door air cylinders to close.
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