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| Illustration 1 | g00781325 |
Pilot operated hydraulic control ( hydrostatic). (1) Pilot valve (2) Control lever (3) Plungers (4) Resolver block (5) Solenoid valve ( hydrostatic) | |
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| Illustration 2 | g00781326 |
Pilot operated hydraulic control ( work tool). (6) Pilot valve (7) Control lever (8) Plungers (9) Solenoid valve ( work tool) | |
There are two pilot valves on the machine. Hydraulic oil flows to the two pilot valves from separate circuits. Hydraulic oil for both circuits comes from the gear pump.
The first pilot valve (1) controls the motion of the machine. The control lever (2) is moved to a desired position. The plungers (3) for the pilot valve are moved by the control lever. The plungers direct the oil flow to the resolver block (4). The resolver block directs the hydraulic oil to the actuator pistons for the piston pumps ( hydrostatic). The solenoid valve ( hydrostatic) (5) is an interlock solenoid. The solenoid must be energized in order for oil to flow to the pilot valve. Refer to the Systems Operation, "General Information" for more information on the interlock system.
The second pilot valve (6) controls the motion of the work tool. The control lever (7) is moved to a desired position. The plungers (8) for the pilot valve direct the pilot hydraulic oil to the respective spool in the control valve. The work tool reacts accordingly. The solenoid valve ( work tool) (9) is an interlock solenoid. The solenoid must be energized in order for oil to flow to the pilot valve. Refer to the Systems Operation, "General Information" for more information on the interlock system.
The control levers on both pilot valves are spring centered. When the levers are released, the levers will return to the NEUTRAL position.
Refer to the Operation and Maintenance Manual, "Speed and Direction Control (Joystick)" and the Operation and Maintenance Manual, "Work Tool Control (Joystick)" for information on the operation of the pilot operated hydraulic controls.
Options for the Pilot Valve
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| Illustration 3 | g00860493 |
Horn Switch (if equipped)
The horn switch (3) (if equipped) is located on the handle of the pilot operated hydraulic control ( hydrostatic). The horn switch operates the horn (4) .
Refer to the Operation and Maintenance Manual, "Horn" for information on the operation of the horn.
Fourth Function Control (if equipped)
The fourth function control (1) (if equipped) is located on the handle of the pilot operated hydraulic control ( hydrostatic). The fourth function control controls the operation of the auxiliary electrical circuit (5) .
Refer to the Operation and Maintenance Manual, "Fourth Function Control" for information on the operation of the fourth function.
Two Speed Control (if equipped)
The two speed control (2) (if equipped) is located on the handle of the pilot operated hydraulic control ( hydrostatic). The two speed control engages the high speed operation of the piston motor ( hydrostatic).
Refer to the Operation and Maintenance Manual, "Two Speed Control" for information on the operation of the two speed function.