ENGINE AR 1304571 - Caterpillar

Introduction
The AP-655C Asphalt Paver is equipped with four different standard hydraulic systems. The machine may include additional systems that are optional. The following systems are all of the hydraulic systems AP-655C Asphalt Paver:
Power Train System
Material Feed System
Vibratory System
Generator System (Option)
Auxiliary SystemAll of the different hydraulic systems utilize a separate hydraulic pump. However, all of the systems do share a common hydraulic tank and a common hydraulic oil cooler.Auxiliary System
The auxiliary pump draws hydraulic oil from the hydraulic tank in order to supply hydraulic oil to the following components of the auxiliary system:
Track tension system - A further explanation of the track tension system will be examined in the propel system. Refer to Service Manual, KENR5026, "Power Train".
Planetary brake (18) and (25) - A further explanation of the planetary brake will be examined in the propel system. Refer to Service Manual, KENR5026, "Power Train".
Planetary gear shift (19) and (26) - A further explanation of the track tension system will be examined in the propel system. Refer to Service Manual, KENR5026, "Power Train".
Screed extension (9) and (13)
Tow point (10) and (14)
Truck hitch (option) (11) and (15)
Ventilation system (16)
Manual brake release (17)
Screed lift (20) and (27)
Screed Counterbalance System (8)
Auger lift (21), (22) and (28)
Hopper hoist (23), (24) and (12) As the switch is activated, a signal is then sent to the solenoids. The solenoid will send a signal to the valve, which will energize the particular cylinder for the desired function. Most of the valves for the auxiliary system are contained in auxiliary bank (2). The auxiliary functions that are not contained in auxiliary bank valve (2) will be in a separate valve bank. Most of the valves are located near that particular function.Auxiliary PumpAuxiliary pump (1) draws hydraulic oil from common hydraulic tank (5) in order to supply pressure oil to the components of the auxiliary system.Auxiliary pump (1) is a variable displacement, pressure compensating, axial piston pump. The auxiliary pump also is equipped with displacement limiters for a variable pump flow output. As the engine is in operation, the auxiliary pump will turn. Although the auxiliary pump is always in operation, the auxiliary pump will only meet the demand of flow for each component that is active.Auxiliary pump (1) is also designed to stay at auxiliary pressure at all times. The pressure compensator control will limit the maximum pressure in the hydraulic system. This is done by varying the output flow of the pump. As the pressure at the pump rises above the nominal pressure of 13800 345 kPa (2000 50 psi), the control will decrease the displacement of the pump to the minimum output flow. As the pump reaches the nominal pressure, the control will regulate the pump displacement in order to produce an output flow that will limit the system pressure to the setting of the compensator. This setting at the pressure compensator will protect the hydraulic system. In addition, the auxiliary pump will only output the flow as a demand is in need.