LINKAGE AR-BUCKET 3904349 - Caterpillar

Illustration 1 g00796965
Place "CB1" in the OFF position in order to remove the power.
Disconnect the speed sensor from terminals 4 and 5 of the tachometer.
Connect the positive lead of the signal generator to terminal 4 of the tachometer and to terminal 5 of the tachometer.
Place "CB1" in the ON position.
Measure the voltage at terminal +4 of the tachometer with respect to terminal −5 of the tachometer. The voltage should be greater than 3.5 volts.
Check the following components and refer to Table 1.
Engine Crank Terminate Relay
Engine Crank Terminate Time Delay Relay
Engine Oil Step Relay
Engine Overspeed RelaySet the 163-0096 Diagnostic and Calibration Tool to 10 Hz below the setpoint that is desired. The output for that setting should remain OFF. Change the settings to 10 Hz above the setpoint that is desired. The output terminal of the tachometer should have 24 VDC with respect to terminal 2. The output of the relay for that setting should turn on.
Table 1
Rated Speed    Crank Termination    Time Delay for the Crank Termination    Oil Step    Overspeed    
720 RPM     723 Hz     723 HZ +9 sec     2295 Hz     3458 Hz    
750 RPM     723 Hz     723 HZ +9 sec     2391 Hz     3602 Hz    
900 RPM     723 Hz     723 HZ +9 sec     2869 Hz     4322 Hz    
930 RPM     723 Hz     723 HZ +9 sec     2964 Hz     4466 Hz    
1000 RPM     723 Hz     723 HZ +9 sec     3188 Hz     4803 Hz    
1050 RPM     723 Hz     723 HZ +9 sec     3347 Hz     5043 Hz    
Output Terminal of the Tachometer     14     12     11     9    
Output of the Relay     "ECTR"     "ECTTDR"     "EOSTR"     "EOSSR"    Note: Once the output of the crank termination is activated, the output will stay on until the frequency of the signal generator is set to 10 Hz and two seconds pass.Note: The output of the oil step activates after a 9 second delay after the frequency is set above the setpoint. The oil step will deactivate when the frequency falls below the setpoint.