| |
| Illustration 1 | g01072713 |
|
(1) Implement pump
(2) Implement control valves (3) Hydraulic tank (4) Case drain filter (5) Remote taps for the implement hydraulics (6) Hydraulic oil filter (7) Pilot control valves | |
| |
| Illustration 2 | g01072654 |
Hydraulic implement pump (1) is a pressure compensated piston pump with variable displacement. The pump provides the oil flow for the implement hydraulic system. Oil is pumped from the hydraulic tank and to the control valves. The oil is then available to activate the implements when the operator moves the implement control levers.
A compensator valve is attached to the hydraulic pump. The compensator valve regulates pump output flow in response to the demands of the system. This valve also limits the maximum system pressure.
The hydraulic pump is mounted to the lower left portion of the torque converter housing.
| |
| Illustration 3 | g01072540 |
| |
| Illustration 4 | g01072541 |
Bulldozer control lever (8) controls lifting and tilting of the blade. The bulldozer control lever also controls the angle of the blade. Ripper control lever (9) is located behind the bulldozer control lever. The ripper control lever controls the lift operation of the ripper, if the machine is equipped with a ripper.
| |
| Illustration 5 | g01072544 |
|
Top view | |
The system contains three control valves, or four control valves if the machine is equipped with a ripper. The control valves control the oil flow to the implement cylinders. The control valve stack (2) is located behind the access door on the right side of the machine.
All the control valves have makeup valves or combination line relief and makeup valves except for the tilt control valve. The line relief valves protect the cylinders and the lines from pressure spikes that are caused by outside forces on the blade. Makeup valves work in conjunction with the return oil restrictor in order to combine return oil flow with supply oil. This occurs when implements are moved rapidly and the demand for oil exceeds the flow capacity of the pump oil.
Oil to the control valve, from the control valve, and from the resolver network flows through the inlet manifold. The inlet manifold is mounted directly to the control valve stack. There is an return oil restrictor in the outlet port of the inlet manifold. The restrictor works in conjunction with the makeup valves in order to prevent pump cavitation. This is done by restricting the flow of return oil when an implement is moved rapidly. This forces the return oil to build pressure and dump over the makeup valves in order to supplement the pump flow.
The signal resolver network is contained within the control valves. This network of check valves compares pressures within the circuits in order to send the highest signal pressure to the pump compensator valve through the signal line. The pump compensator valve determines the system load and flow needs from the signal that is received from the resolver network.
| |
| Illustration 6 | g01245598 |
|
D6N with FTC CBF300-Up CCG400-Up ALH735-Up CBJ400-Up ALR635-Up | |
| |
| Illustration 7 | g01245601 |
|
D5N with FTC AGG1335-Up AKD1135-Up CFH0300-Up CKT0400-Up | |
The hydraulic pressure taps provide convenient testing of the system conditions, including pump discharge pressure (10) and pilot pressure (11). The pressure taps are located behind the access door on the right side of the machine.
| |
| Illustration 8 | g01072650 |
Hydraulic tank (3) is located at the rear of the machine on the right side. The hydraulic tank is a reservoir that contains the hydraulic oil. The main oil filter assembly is a part of the hydraulic tank assembly. The filter stops debris in the oil that flows from the control valves back to the tank in order to prevent damage to the hydraulic system components.
| |
| Illustration 9 | g01072629 |
Case drain filter (4) stops debris in the oil that flows from the pump case drain back to the tank in order to prevent damage to the hydraulic system components. The case drain filter is located behind the access door on the right side of the machine.