5-25-2
Minimize Bucket SwingMinimize Bucket Swing
Semicircular LoadingSemicircular Loading
WORKING THE TRUCKWORKING THE TRUCK
Off-highway trucks are used on a variety of hauling jobs, from mine overburdenOff-highway trucks are used on a variety of hauling jobs, from mine overburden
removal to dam building. Every truck operation, regardless of the type of job, canremoval to dam building. Every truck operation, regardless of the type of job, can
be divided into four phases; loading, hauling, dumping and the empty return.be divided into four phases; loading, hauling, dumping and the empty return.
Note:Note: After coming to a stop for loading or unloading the truck, the Parking-After coming to a stop for loading or unloading the truck, the Parking-
Emergency Brake control can be pushed in to hold the brakes in the appliedEmergency Brake control can be pushed in to hold the brakes in the applied
position as though the foot brake is depressed.position as though the foot brake is depressed.
LoadingLoading
The most common methods of loading trucks are with hydraulic excavators, ropeThe most common methods of loading trucks are with hydraulic excavators, rope
shovels, and front end loaders. For maximum material movement, the truckshovels, and front end loaders. For maximum material movement, the truck
operator must help the loading machine operator hold loading time to a minimum.operator must help the loading machine operator hold loading time to a minimum.
The fewer manoeuvres the truck must make to get into loading position, theThe fewer manoeuvres the truck must make to get into loading position, the
sooner loading can start. And the shorter the distance the loading unit bucketsooner loading can start. And the shorter the distance the loading unit bucket
must travel between the cut, or stockpile and the truck body, the more passes itmust travel between the cut, or stockpile and the truck body, the more passes it
can make in a given period of time and the quicker the truck can be loaded.can make in a given period of time and the quicker the truck can be loaded.
Ideally, the hydraulic excavator or rope shovel should require 90Ideally, the hydraulic excavator or rope shovel should require 90
oo
or less swing toor less swing to
dump into the truck body for best loading efficiency. Required turning anddump into the truck body for best loading efficiency. Required turning and
backing to position the truck for loading should be held to a minimum. A commonbacking to position the truck for loading should be held to a minimum. A common
loading method is to have trucks travel a semicircle in the loading area. Thisloading method is to have trucks travel a semicircle in the loading area. This
method eliminates all backing. Waiting machines should stay about two truck-method eliminates all backing. Waiting machines should stay about two truck-
lengths behind the one being loaded to avoid any spillage from the loadinglengths behind the one being loaded to avoid any spillage from the loading
machine bucket or truck body. The operator of the waiting truck is also bettermachine bucket or truck body. The operator of the waiting truck is also better
able to judge the best spot for his truck when it is his turn to be loaded.able to judge the best spot for his truck when it is his turn to be loaded.
On some jobs, the loading machine might work most efficiently when trucks areOn some jobs, the loading machine might work most efficiently when trucks are
positioned on both sides of the loader. Thus, while one truck is being loaded,positioned on both sides of the loader. Thus, while one truck is being loaded,
another can move into position on the opposite side of the loader and the loadinganother can move into position on the opposite side of the loader and the loading
machine can swing over to load the next truck with a minimum of lost time. Sincemachine can swing over to load the next truck with a minimum of lost time. Since
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Holding Truck StationaryHolding Truck Stationary
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