CONVERSION AR-ROADING 2063776 - Caterpillar

Illustration 1 g00447024
Lever Raise ModulationIllustration 1 represents the interpretation by the Implement ECM of the signal from the lift lever when the lift lever is in the RAISE position. As the lever is moved away from the CENTER position, no current is supplied to the raise solenoid for the lift linkage until the lever is three degrees from the center. At three degrees of lever travel, the ECM supplies the Start of Modulation Current (1) to the raise solenoid. As the lever is moved toward the detent, the current that is supplied to the raise solenoid increases. The increase is linear up to the Raise Maximum Modulation Current (2). The maximum modulation current is reached just before the lever enters the detent position. Entering the detent position does not increase the current more.
Illustration 2 g00447025
Lever Lower ModulationIllustration 2 represents the interpretation by the Implement ECM of the signal from the lift lever when the lift lever is in the LOWER position. As the lever is moved away from the center, no current is supplied to the solenoid valve until the lever is three degrees from the center. At three degrees of lever travel, the ECM supplies the Start of Modulation Current (3) to the lower solenoid. As the lever is moved toward the detent, the current that is supplied to the lower solenoid increases. The increase is linear up to the Lower Maximum Modulation Current (4). The maximum modulation current is reached just before the lever enters the detent position. As the lever is moved into the detent position, the ECM will increase the current. The current will increase until pilot pressure shifts the main valve into the FLOAT position.Note: The Start of Modulation Current provides pilot pressure in order to shift the main valve spool. When the main spool is shifted, hydraulic oil will flow to the cylinders. The Start of Modulation Current varies for each valve. The Start of Modulation Current must be adjusted for each valve. The currents must be calibrated on each machine. Refer to the Service Manual module Testing and Adjusting, "Electro-Hydraulic System, Calibration".Note: The Maximum Modulation Current provides enough pilot pressure in order to fully shift the main valve spool. When the main valve spool is shifted fully, the cylinder will reach maximum velocity. The Maximum Modulation Current must be adjusted for each valve. The currents must be calibrated on each machine. Refer to the Service Manual module Testing and Adjusting, "Electro-Hydraulic System, Calibration".