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Truck Hitches The purpose of a truck hitch on the front of the paver hopper is to keep the truck dumping hot mix into the hopper in contact with the paver. If, during dumping, the truck and the paver separate and hot mix spills, it must be cleaned up before the paver passes over it. Two types of truck hitches are in common use. One type uses an extension that reaches under the truck and hooks onto the rear axle of the truck. The other type of hitch has retractable rollers that are attached to the truck push bar and grip the outer side of the rear wheels of the truck. The rollers revolve with the wheels while the truck dumps its load into the hopper. Pivoted Truck Push Rollers The pivoted push roller is a device, mounted on the front of the paver, that adjusts when alignment between the truck and paver is uneven. This device reduces the uneven force exerted on the paver by the misaligned truck, minimizing interference in the steering of both vehicles. ASPHALT FINISHERS (PAVERS) Various makes and models of asphalt finishers are used by the Naval Construction Force (NCF). Two types are shown in figure 16-38. Even though the finishers may operate differently, their primary jobs are all the same: receiving asphalt and spreading it in a predetermined, uniform length, width, thickness, and shape. The finisher also provides initial compaction of the mat (layer of mixture in place.) Because asphalt finishers are different, you must always read the operator's manual for the unit you are operating. It is also good to have a practice sand laydown before actually using a hot mix. This is to familiarize yourself and others with the machine and also ensure that the machine is working properly. Figure 16-39 shows a practice laydown, using just the aggregate mix without the asphalt.
Figure 16-38.-Two common types of asphalt finishers.
Figure 16-39.-Practice laydown. 16-35 |
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