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| Illustration 1 | g00935664 |
(1) Implement pump (6) Implement control valves (7) Hydraulic tank (8) Case drain filter (11) Remote taps for the implement hydraulics (12) Hydraulic oil filter | |
Hydraulic Pump
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| Illustration 2 | g00918609 |
Hydraulic implement pump (1) is a variable displacement, pressure compensated piston pump. 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. Compensator valve (2) 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 torque converter housing (3) .
Implement Control Levers
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| Illustration 3 | g00918612 |
Bulldozer control lever (4) controls lifting and tilting of the blade. The bulldozer control lever also controls the angle of the blade. The ripper control lever (5) is located behind the bulldozer control lever. The ripper control lever controls the lift operation of the ripper on machines that are equipped with a ripper. The control levers are connected to the control valves by linkages.
Implement Control Valve
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| Illustration 4 | g00918617 |
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. Control valve stack (6) 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 pump oil flow capacity.
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 a 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.
Signal Resolver Network
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.
Hydraulic Tank and Filter
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| Illustration 5 | g00918619 |
Hydraulic tank (7) is located at the rear of the machine on the right side. The hydraulic tank is a reservoir that contains the hydraulic oil for both the implement hydraulic system and the steering hydraulic system. 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.
Case Drain Filter
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| Illustration 6 | g00926290 |
Case drain filter (8) stops debris in the oil that flows from the implement pump case drain and the steering 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.
Pressure Taps
The hydraulic pressure taps provide convenient testing of the system conditions, including pump discharge pressure (9) and signal pressure (10). The pressure taps are located behind the access door on the right side of the machine.