Electrical System and Hydraulic System Diagram
The following diagram shows the electrical components and the hydraulic components of the auxiliary system for the AP-655C Asphalt Paver.
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| Illustration 1 | g00951650 |
Hydraulic System and Electrical System for the Auxiliary System (1) Auxiliary pump (2) Auxiliary bank valve (3) Pressure manifold (4) Return manifold (5) Hydraulic tank (6) Return filter (7) Suction strainers (8) Left and right screed counterbalance valves (9) Left and right screed extenders (10) Left and right tow point control (11) Truck hitch (option) (12) Left and right hopper hoist cylinders (13) Bank valve (screed extenders) (14) Tow point valves (15) Bank valve (truck hitch) (16) Ventilation motor (17) Brake release valve (hand pump) (18) Planetary brake line (19) Planetary gear shift line (20) Left and right solenoid valves (screed lift) (21) Solenoid valve (auger raise) (22) Solenoid valve (auger lower) (23) Solenoid valve (hopper raise) (24) Solenoid valve (hopper lower) (25) Solenoid valve (planetary brake) (26) Solenoid valve (planetary shift) (27) Left and right screed lift cylinders (28) Left and right auger hoist cylinders | |
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 System
All 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 Pump
Auxiliary 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. This situation creates a setting that will never over work the efficiency of the hydraulic pump. As a function is selected, hydraulic oil is routed from auxiliary pump (1) to pressure manifold (3) .
Pressure Manifold
Pressure manifold (3) acts as a splitter for the different supply lines to the components. There is not a reduction in flow of any kind. The pressure oil is simply split and routed to auxiliary bank (2) and some of the other auxiliary components.
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| Illustration 2 | g00953181 |
Pressure Manifold (30) Supply line from the auxiliary pump (31) Supply line to tow point valves (32) Supply line to truck hitch valve (33) Supply line to auxiliary bank valve (34) Supply line to right track takeup (35) Supply line to left track takeup | |
The above illustration is a quick reference to pressure manifold (3) and the different ports that the supply lines will connect to. Screed extenders (9) receive hydraulic oil from the pressure manifold. This supply line is a quick disconnect at the rear of the machine. Supply line (33) routes pressure oil to screed extender valve (13). This is necessary for the capability of different attachments. Refer to the corresponding screed manual for your machine. The hydraulic flow will route directly from pressure manifold (3) to the following components:
- Tow point valves (14)
- Truck hitch valve (option) (15)
- Auxiliary bank valve (2)
The tow point control is covered separately in this manual. Refer to System Operation, "Tow Point Control" for further explanation of the tow point system.
Refer to Service Manual, KENR5029, "Truck Hitch System" for further explanation of optional equipment.
Refer to Service Manual, KENR5026, "Accumulator" for further explanation of the track tensioning system.
Auxiliary Bank Valve
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| Illustration 3 | g00977397 |
Auxiliary Bank Valve with Solenoid Valve Descriptions (2) Auxiliary bank valve (16) Flow control valve (ventilation) (20) Screed lift valves (21) Auger (raise) (22) Auger (lower) (23) Hopper (raise) (24) Hopper (lower) (25) Planetary brake (26) Planetary shift (26) Pressure reducing valve (planetary shift) | |
Auxiliary bank valve (2) routes pressure oil to the following components:
- Ventilation motor (16)
- Screed lift cylinders (27)
- Auger lift cylinders (28)
- Hopper hoist cylinders (12)
- Planetary brake (18)
- Planetary shift (19)
Refer to System Operation, "Bank Valve - Auxiliary" for a further explanation of the auxiliary bank valve.
Return Manifold
As pressure manifold (3) acts as a splitter for the different supply lines to the components, return manifold (4) performs the same function. Instead of routing pressure oil to the auxiliary components, return manifold (4) routes return oil back to hydraulic tank (5) through return filter (6). This will recirculate the hydraulic oil and reduce the chance of contaminants in the system. There is no reduction in flow until the oil reaches return filter (6) with a 170 kPa (25 psi) bypass valve.
The only difference in routing between the two manifolds is the way that the hydraulic oil returns to the tank. Auxiliary bank valve (2) routes return oil directly to return filter (6).
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| Illustration 4 | g00977407 |
Return Manifold (4) Return manifold (36) Return line from cooling fan motor (37) Return line from generator pump (case drain) (38) Return line for optional pump (plugged) (39) Return line for truck hitch valve (40) Return line from generator motor (41) Return line from tow point valves (42) Main return line to the hydraulic return filter (43) Return line from the auxiliary pump | |
The above illustration is a quick reference to return manifold (4) and the different ports that the supply lines connect to. After the hydraulic oil has been returned to hydraulic tank (5) through return filter (6), the oil is then recirculated into the hydraulic system.