3304 & 3306 – Engine Running Fuel System Operation

When the engine is running, any movement of the governor control shaft (1) makes a change in the speed of the engine. Counterclockwise movement (A) causes an increase in engine speed until the movement is held by the high idle stop (2). Clockwise movement (B) makes a decrease in engine speed until the movement is held by the low idle stop (3). More clockwise movement (B) moves the linkage beyond the detent (4) in the control. Still more clockwise movement (B) causes the pumps to stop injection and, because no fuel goes to the cylinders, the engine stops.

1. Governor control shaft. 2. High idle stop. 3. Low idle stop. 4. Detent. A. Counterclockwise movement. B. Clockwise movement.

1. Governor control shaft. 5. Groove. 6. Tooth. 7. Lever. 8. Edge of lever (7). 9. Lever.

Governor control shaft (1) has a groove (5) which fits a tooth (6) in lever (7). Any movement of shaft (1) moves lever (7) in the same direction. If the shaft and lever have counterclockwise movement (A), an edge (8) of lever (7) comes into contact with lever (9).

10. Seat. 11. Washer. 12. Governor spring. 13. Seat. 14. Riser.

13. Seat. 15. Load stop. 16. Load stop pin. 17. Lever. 18. Lever.

18. Lever. 19. Hole. 20. Pin.

More counterclockwise movement (A) pushes lever (9) against seat (10), washer (11), governor spring (12), seat (13), and riser (14). The movement of seat (13) pushes against lever (17) which works like a bellcrank and pushes load stop pin (16) up. The load stop pin (16) can be pushed up until it is in contact with the load stop (15). This is the limit for the movement toward maximum fuel for injection. At the same time the lower end of lever (18) is in the groove in riser (14). As the riser moves, lever (18) works like a bellcrank and moves pin (20) which is in the top end of the lever. The outer end of pin (20) has the shape of a ball. It fits in a hole (19) in the bottom part of lever (23). The turning of lever (23) makes lever (24) turn the fuel control shaft (21) through spring (22). This makes an increase in the fuel for injection to the cylinder.

19. Hole. 21. Fuel control shaft. 22. Spring. 23. Lever. 24. Lever. 25. Pin.

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