TRACK GP 3985235 - Caterpillar

Tool Control
When an attachment tool is being operated, the engine speed and the pump flow are controlled according to the type of tool. For more information, refer to the appropriate service manual for the tool control of the machine that is being serviced.Selection Of A Tool
There are five preprogrammed tools. The operator selects the tool. The monitor is used to make the selection. The following items are examples of some parameters which can be adjusted in order to accommodate a particular tool:
The engine speed dial setting
Pump flow for one or two pumps
Pump flow for one or two directions
The horsepower setting for the attachment pumpEngine Speed Control
When the pedal is operated, the actual setting of the engine speed dial is compared to the position of the engine speed dial that was set by the parameter. The engine speed control will lower the engine speed to the selected engine speed that was set in the adjustable parameter. When the tool is deactivated, the speed of the engine will return to the actual speed of the setting of the engine speed dial.When the attachment tool is being operated, the AEC and the one touch low idle are released. Note: If the programmed value is higher than the engine speed dial indicator, the engine speed will not be raised.Main Pump Flow Control
Some tools use the flow of the main pump. A pressure switch detects the pressure change. A proportional reducing valve restricts the main pump flow. A resolver valve selects the higher pressure between the pressure in the control valve and the pressure from the proportional reducing valve. This signal restricts the pump flow to a lower pressure. The main pump flow is then reduced.This process results in better simultaneous operation of the tool and operation of the implement.Main Pump Control During Use Of The Auxiliary Pump
The machine ECM detects an attachment pump operation. This offsets the load of the attachment pump. This process also prevents a decrease of the engine speed. If an attachment pump is operated with 50 percent of the rated load and the main pumps are operated at the same time, a reduction in engine speed is prevented.Backup System
Illustration 12 g01216056
Backup System Connections (12) Machine ECM (13) Starter Switch (22) Main Backup Switch (23) Swing Brake Release Solenoid (25) Power Shift Pressure Proportional Reducing Valve (41) Engine ECM (51) Backup Resistor (53) Acceleration/Deceleration at Backup (54) Engine Speed Selector SwitchThe "Backup System" allows limited manual control of machine movement functions in the event that other machine functions have failed.The main backup switch (22) is located to the right rear of the console. When the main backup switch (22) is turned to the MAN position, the viscous fan speed is set to maximum, the power to the machine ECM is removed and the "Limited Mobility Mode" is activated. At this time, the joysticks and the travel pedal cease to function. The engine speed dial on the switch panel of the right console does not function. The engine speed can be