3606 and 3608 Engines Caterpillar

Adjusting the Governor Actuator Linkage

The governor actuator linkage must be adjusted in order to synchronize the actuator travel with the travel of the engine fuel control linkage.

Note: Before the adjustment of the actuator linkage is made, the fuel injectors must be correctly synchronized. Refer to System Operation, Testing and Adjusting, "Fuel Injector Synchronization".

Illustration 1	g01346033
Governor actuator linkage (1) Synchronizing pin (2) Governor actuator (3) Governor terminal shaft (4) Governor control housing (5) Shaft (6) Rod (7) Lever (A) Location for Synchronizing pin (B) Location for dial indicator (C) Angle of installation

1. Remove the two plugs from location (A) and from location (B) on governor control housing (4) .

2. Remove synchronizing pin (1) from the storage location in the governor control housing. Install the synchronizing pin in the governor control housing at location (A) without the spacer.

   Tighten the synchronizing pin to the following torque. ... 10 ± 2 N·m (7 ± 1 lb ft)

3. Rotate shaft (5) in the "Fuel On" direction until the flat surface of the fuel stop lever contacts synchronizing pin (1). Hold the shaft in position. Dead weights are recommended.

4. For the 4C-6594 Timing and Fuel Setting Tool, install the 5P-4814 Collet Clamp in the threaded hole at location (B). Slide the 6V-3075 Dial Indicator with the 5P-7263 Indicator Contact Point into the 5P-4814 Collet Clamp. When the contact point seats against the fuel stop lever, slide the indicator inward or slide the indicator outward until the indicator dial reads +5.00 mm (+0.197 inch). Tighten the collet in order to hold the indicator in position. The indicator is now ready to be used.

5. Remove synchronizing pin (1) from the governor control housing and install the pin into the storage location. Install the plug in the threaded hole at location (A) .

6. Remove rod assembly (6) .

7. Rotate governor terminal shaft (3) to the minimum fuel position. Then hold the governor terminal shaft in place.

8. Install lever (7) on shaft (3) so the centerline of the lever is 40.7 degrees from the vertical centerline. This is shown by angle (C) .

9. Adjust rod assembly (4) between the control housing lever and the actuator lever (3). Use the appropriate procedure that follows.

   1. If the 4C-6594 Timing and Fuel Setting Tool is being used, adjust the rod assembly until the 6V-3075 Dial Indicator displays a reading of −4.50 mm (−0.177 inch). Secure the rod assembly in place with the locknuts. Ensure that each rod end on the rod assembly has the same amount of thread engagement.

Show/hide table

Personal injury or death can result from flying objects generated by engine overspeed. The engine could overspeed as a result of improper linkage assembly, adjustment, or governor deadband. Be prepared to stop the engine by activating the engine air shut-off or closing the air off to the air inlets.

10. The definition of governor deadband is the total amount of travel between the point of actual fuel shutoff and the actual "FUEL OFF" position. When the 6V-3075 Dial Indicator is used and when the reading of the maximum actuator "FUEL OFF" is more positive than −4.50 mm (−0.177 inch), the governor deadband can be eliminated. −3.75 mm (−0.148 inch) is an example of a reading that is more positive than −4.50 mm (−0.177 inch). This can cause an engine overspeed.

11. Remove the plug from location (A). Remove synchronizing pin (1) from the storage location in the governor control housing, and install the pin at location (A) without the spacer. When the 6V-3075 Dial Indicator is used, ensure that the indicator still reads +5.00 mm (+0.197 inch). If the indicated reading is not correct, repeat Step 3 through Step 9. If the indicated reading is correct, continue with the procedure. If the 6V-3075 Dial Indicator is used, adjust the dial indicator in order to read 0.00 mm (0.000 inch). This must be done before continuing the procedure.

12. Check the fuel setting. Refer to System Operation, Testing and Adjusting, "Fuel Setting".

13. Remove the dead weight from the actuator terminal shaft.

14. Remove synchronizing pin (1) from location (A) and install the plug. Install the synchronizing pin and install the spacer in the storage location.

15. Remove all tooling from location (B) in the governor control housing. Install the plug at location (B) .

16. Before starting the engine, put a mark on the governor actuator's position indicator at the point of minimum governor travel. This is the engine's stopped position.

Show/hide table

The engine may overspeed due to incorrect assembly or adjustment. Engine overspeed could result in personal injury, loss of life and/or property damage. Be prepared to stop the engine by activating the engine shutdown system or closing the air inlet lines.

17. Start the engine and operate the engine at low idle. Put a mark on the governor actuator's position indicator. This is the engine running position.

18. The engine running position of the governor actuator must be six degrees or more above the engine's stopped position.

19. Operate the engine at high idle without a load in order to ensure that the governor actuator can control the engine.