An ALF Cab Latch, or cab lock/hold down switch, is a device that is used to secure the cab of an American LaFrance fire truck to the chassis. It is typically located on the front of the cab, and it works by engaging a latch that is located on the chassis. When the latch is engaged, the cab is prevented from tilting or moving.
They are a critical safety feature, as it helps to prevent the cab from becoming separated from the chassis in the event of an accident or rollover. It is also important to ensure that the ALF Cab Latch is properly adjusted, as a loose latch can allow the cab to move, which can create a dangerous situation.