1.11. CHARACTERISTICS, CAPABILITIES, AND DATA

TM 5-3895-373-20 1.11. CHARACTERISTICS, CAPABILITIES, AND DATA. The paving machine is a turbosupercharged, 4-cylinder, diesel powered, hydraulically driven tracked vehicle. The engine is coupled to a dual main pump drive gearbox which drives two propulsion pumps in tandem with two auxiliary pumps and one auxiliary vibration pump. The propulsion pumps supply hydraulic pressure to the track drive motors. The auxiliary hydraulic pumps are used to operate all controls and cylinder drive functions. Control handles on the operator control panel control each track drive motor located on the undercarriage of the paving machine. Paving speed is from 0 to 135 fpm (O to 41 mpm) with travel speed (switch selected) of 0 to 3.2 mph (O to 5, 2 kph). Hydraulic cylinders automatically maintain tension on the 12-inch wide steel track pad. A high wear-resistant rubber pad is attached to each track pad. Spring applied hydraulically released disc brakes are located between the hydraulic drive motors and torque hubs. In the event that hydraulic pressure or electrical power is lost, the brakes are automatically applied. Push rollers are located in front of the material hopper and are designed to ride against the rear wheels of the paving material haul truck. The push rollers allow the paving machine to push the haul truck forward, while continuing to receive material into the hopper and spread the paving material at the same time. Hopper wings are hydraulically raised and lowered from the operator control console. Dual slat conveyors move the paving material from the hopper to the auger, and are independently controlled from the operator control console. Two electric actuators control flow gates that meter the amount of material conveyed to the augers. Two 12-inch (304 mm) augers spread the paving material in front of the screed. Four diesel fuel-fired burners are located on the screed. The burners heat the screed plates to approximately 300°F (150°C) to prevent paving material from sticking to the screed plates. The screed is hydraulically extendable from 8 to 14 feet (2, 4 to 4, 3 m) and can be extended further to 16 feet (4, 9 m) with bolt-on screed and auger extensions. Mechanical adjustments on the screed control the thickness, slope, and crown of the paving material. The screed vibrator provides the initial compaction of the paving material. The amount of compaction is controlled by the frequency and amplitude of vibration. Vibration is controlled by the screed vibration control valve, located underneath the operator platform on the rear tractor bulkhead. 1.12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. The following provides the location and description of major paving machine components maintained by the organizational maintenance activity. 1.12.1. Engine Compartment. The engine compartment houses the paving machine drive system and hydraulic power components, air cleaner, filters, radiator, hydraulic oil cooler, exhaust system, and flow gates. These components are described as follows: a. Drive System and Hydraulic Power. The paving machine drive system includes a turbosupercharged diesel engine with a pump drive gearbox adapted to the engine flywheel. Directly coupled to the gearbox drives are two main hydraulic propulsion pumps. The propulsion pumps provide hydraulic power to the left and right track drive motors. Two auxiliary hydraulic pumps, and one vibration pump are connected to the propulsion pumps in tandem. These pumps provide hydraulic power to non-propulsion hydraulic functions needed to operate the paving machine. 1-3