H&S 1226 Operator's Manual page 21

OPERATION
BARN DOORS - OPTIONAL
Barn doors are optional on the Big Dog.
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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