LINES GP-AIR 4928366 - Caterpillar

Illustration 1 g00872329
(1) Cover screw for the "OVERSPEED" potentiometer (2) Cover screw for the "CRANK TERM" potentiometer (3) Cover screw for the "OIL STEP" potentiometer (4) Retainer clip (5) "OVERSPEED" indicator (6) "RESET" switch
To gain access to the potentiometers, remove cover screws (1), (2), and (3) .
Connect the positive "+" lead from a source of 24 VDC to "8-40 VDC" terminal 6. Connect the negative "-" lead to "8-40 VDC" terminal 5.
Connect the frequency generator's positive "+" lead to "PICK-UP SIG" terminal 4. Connect the negative "-" lead to "PICK-UP SHLD COM" terminal 3.
Turn ON the 24 VDC for the speed switch.
Adjust the speed switch's crank terminate relay.
Connect the 9U-7330 Digital Multimeter to "CRANK TERM NO" terminal 10 and "CRANK TERM COM" terminal 11. Set the multimeter to the "Ohms" scale.
Turn ON the power to the frequency generator.
Adjust the frequency generator to 0 Hz.
Adjust the frequency to 691 Hz.
Slowly increase the frequency in increments of 1 Hz and observe the resistance between terminals 10 and 11. Continue to increase the frequency in 1 Hz increments until the frequency is 701 Hz.Note: A frequency of 701 Hz corresponds to the setpoint for the crank terminate speed of 165 rpm.Expected ResultThe resistance became less than 5 ohms at a frequency of 701 Hz. The circuit is closed and the crank terminate relay is operating correctly.ResultsOK - The resistance became less than 5 ohms at a frequency of 701 Hz. The circuit is closed and the crank terminate relay is operating correctly. Proceed to Step 7.Not OK - The resistance became less than 5 ohms at a frequency of less than 701 Hz (165 rpm). The crank terminate relay was energized too soon. The setpoint is too low and the setpoint must be adjusted. To reset the relay, turn OFF the power to the speed switch. Use the 4C-4029 Adjustment Tool to turn potentiometer (2) clockwise for two full turns (720 degrees). Continue to provide a frequency of 701 Hz. Turn ON the power to the speed switch and slowly turn potentiometer (2) counterclockwise until the resistance is less than 5 ohms. Then turn OFF the power to the speed switch. Adjust the frequency generator to 0 Hz. Turn ON the power to the speed switch. Repeat Steps 6.d and 6.e until the