SHAFT AS-BALANCE 7W9941 - Caterpillar

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 Hydraulic Pump 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 14 g01154870
Backup System Connections (11) Hydraulic Pump ECM (12) Starter Switch (20) Main Backup Switch (21) Swing Brake Release Solenoid (23) Power Shift Pressure Proportional Reducing Valve (39) Engine ECM (48) Engine Speed Selector Switch (49) Acceleration/Deceleration at Backup (50) Backup ResistorThe "Backup System" has been installed to allow an operator to manually control a limited amount of machine functions in order to move a machine in the event that other machine functions have failed.The main backup switch (20) is