SECTION III. PRINCIPLES OF OPERATION

TM-5-3895-373-10 Distributor Liduid Bitumious Seaman-Maxon Inc Model BIT Manual
Page Navigation
7

TM 5-3895-373-10 SECTION III. PRINCIPLES OF OPERATION 1.12 PAVING MACHINE. The paving machine consists of the tractor and screed. It is normally manned with one paving machine operator and two screed crew members. The tractor unit pushes a haul truck while the haul truck unloads paving material into the tractor hopper. The twin dual slat conveyor system on the tractor unit carries the paving material from the hopper to the augers. Two electrically- controlled flow gates, mounted behind the hopper, regulate the amount of material fed to the augers at the back of the tractor. The augers spread the paving material evenly along the length of the leading edge of the screed. As the tractor unit moves forward, it tows the screed over the paving material. Burners on the screed heat the screed plate and maintain its temperature equal to that of the paving material to prevent sticking. The screed is equipped with a vibrating screed plate, which provides a high degree of compaction to the paving material passing underneath it. Both the tractor and screed units are equipped with controls that impact the paving operation. The paving machine operator can operate virtually all machine functions. The screed crew control boxes contain controls limited to paving functions. 1.13 TRACTOR. The tractor is powered by a Perkins T4.236 turbocharged diesel engine coupled to a pump drive gearbox that provides power to five hydraulic pumps. Two hydraulic propulsion pumps are attached to the gearbox and provide hydraulic oil pressure to drive the propulsion motors mounted on the track frame. Two hydraulic auxiliary pumps and a hydraulic auxiliary vibration pump are attached in tandem to the propulsion pumps. These pumps provide hydraulic oil power to auger/conveyor motors, vibration motors, and all hydraulic cylinder functions on the paving machine. Additional components such as push rollers, hopper wings, and flow gates are discussed in the following paragraphs. 1.13.1 Track Drive. The paving machine is mounted on steel crawler tracks equipped with rubber track pads mounted on steel track pad plates. The hydraulically- powered track drive evenly distributes and supports the weight of the paving machine for greater stability. The tracks operate individually in the forward and reverse directions at variable speeds. The tracks can be counter-rotated for quick turning maneuvers. 1.13.2 Push Rollers. The push rollers are located on the front of the paving machine. The push rollers contact the tires of the haul truck and allow the tractor to push it while receiving paving material. To compensate for misalignment between tractor and haul truck, the push rollers are mounted on a pivoting bumper. 1-7

Privacy Statement
Press Release
Contact