SCREW AS 2564579 - Caterpillar

Lift or Tilt Cylinder Sensor Dynamic - Test
Note: This procedure is performed while the signal wire is disconnected from the VIMS interface module.This quick check is used to determine if the sensor is functioning. The accuracy of the sensor is not checked. Perform this test only after successfully completing the Testing and Adjusting, "Lift or Tilt Cylinder Sensor Dynamic Test".The Electrical System Schematic can be used to determine the connector contacts that correspond to a failed machine condition. Use the proper service tools to remove the connector contact of the signal wire from the machine harness connector of the VIMS interface module.Two items are checked in this test:
A sensor signal is present at the VIMS interface module.
The signal voltage increases with a corresponding increase in the monitored system. The signal voltage decreases with a corresponding decrease in the monitored system. Procedure
CHECK THE FREQUENCY OF THE SIGNAL. .
Ensure that the key start switch is in the OFF position and that the sensor is connected to the machine harness.
Insert the 7X-1710 Multimeter Probe leads in the back of the machine harness connector along side of the signal and ground circuit wires.
Turn the key start switch to the ON position. DO NOT START THE ENGINE.
Measure the frequency between the signal contact and the ground contact. Record the frequency.Expected Result: The frequency is between 150 Hz and 2500 Hz.Results:
OK - Frequency is between 150 Hz and 2500 Hz. The frequency is correct. The VIMS is receiving a valid signal. If the problem still persists further testing is required. Proceed to Step 2.
NOT OK - Frequency is NOT between 150 Hz and 2500 Hz. The frequency is not correct. The sensor is out of range. Replace the sensor. STOP.
CHANGE THE LIFT OR TILT CYLINDER PRESSURE.
Load the bucket in order to increase the cylinder pressure. Proceed to Step 3.
CHECK THE FREQUENCY OF THE SIGNAL.
At the machine harness connector for the VIMS interface module, measure the frequency between the signal contact and the ground contact.Expected Result: The frequency is greater than the value that was recorded in Step 1.Note: The frequency should increment smoothly. The difference between the frequencies of this test CHECK THE FREQUENCY OF THE SIGNAL and the previous step CHECK THE FREQUENCY OF THE SIGNAL depend on the amount of change that is introduced into the system.Results:
OK - Frequency is greater. The frequency incremented smoothly. The sensor is not the cause. STOP.
NOT OK - Frequency is NOT greater. The probable cause is a failed sensor. Replace the sensor. STOP.