PIN & BUSHING GP 3498261 - Caterpillar

Two Functions No Longer Used
The functions for former terminals 28 and 25 are not required on the 2301A Governor. However, these two terminals are still used with different functions assigned. See Chart.
Added Terminals
Load signal terminals 12 and 13 are now located on the terminal strip. Terminals 12, 22 and 27 are common terminals to be used for shield connections. Do not use these terminals when replacing a 2301 Governor with the 2301A Governor. See Special Instruction.
Actuators In Tandem
The 2301A Governor can not be used to run actuators in tandem as shown in the Special Instruction.
Make two changes to Sheet 3 and to Sheet 4 of the Special Instruction. Mark out the Note B and all of Detail A on both sheets.Changes In Control Adjustments
The 2301A Governor does not have a de-droop adjustment and the stability adjustment has been replaced by a Reset Adjustment. Adjustments for Actuator Compensation and for Start-Fuel Limit have been added. The illustration shows the panels for both governors.
New Start-Up And Adjustment Procedures
Initial Prestart Settings
1. Rated SpeedA. Set the Rated Speed potentiometer to minimum (fully counterclockwise).B. Set the external speed trim, if used, to mid-position.2. Reset - Set at mid-position.3. Gain - Set at mid-position.4. Ramp Time - Set at minimum (fully counterclockwise).5. Low Idle Speed - Set at maximum (fully clockwise).6. Load Gain - Set at mid-position.7. Droop - Set at minimum (fully counterclockwise).
Comparison of Adjustments.8. Actuator Compensation.A. Set the Actuator Compensation potentiometer at 2 on the 0 to 10 potentiometer scale for diesel, gas turbine, or fuel injected gasoline engines.B. Set the Actuator Compensation potentiometer at 6 on the 0 to 10 potentiometer scale for carbureted gas engines.9. Start Fuel Limit - Set at maximum (fully clockwise).10. Be sure the actuator is connected to terminals 20 and 21.Prestart Checks
1. Ground Checks. Measure the resistance between terminals 22 and the switch gear cabinet, and between 25 and 22. If the resistance is not infinity, remove each wire from the terminal strip until the resistance becomes infinite. Correct any wiring problems before proceeding. Be sure the power is not connected to 16 and 15.2. Make sure the fuel linkage is free and does not stick or bind.3. Check wiring and see that all screw terminals are tight.Initial Engine Operation
Use the procedure in the 2301 Governor Service Manual (Pages 24, 25 of SENR2928-01) with the following two exceptions: ... The terminal numbers referred to have to be changed as shown in the preceding Chart or in the Special Instruction.... The following procedures must replace Step J, "Gain And Stability Adjustment": 1. Adjust for stable operation.
If engine operation is stable, go to the following "Speed Setting Adjustment" procedure.
If the engine is hunting at a rapid rate, slowly decrease the GAIN (turn the potentiometer counterclockwise) until performance is stable. Adjusting the GAIN may cause a momentary speed change which can be minimized by turning the GAIN potentiometer slowly.
If the engine is hunting at a slow rate, increase the RESET (turn the potentiometer clockwise) until the engine stabilizes. If