SYSTEMS OPERATION
(75V1-UP, 90N6121-UP)
CROSS SECTION OF FUEL SYSTEM WITH DASHPOT GOVERNOR
11. Fuel transfer pump. 13. Camshaft. 14. Housing for fuel injection pumps. 15. Lever. 16. Governor housing. 17. Load stop
pin. 18. Cover. 19. Sleeve control shafts {(two). 20. Inside fuel passage.'21. Drive gear for fuel transfer pump. 22. Lever on
governor shaft. 23. Piston for dashpot governor. 24. Spring for dashpot governor. 25. Governor springs (inner spring is for low
idle: outer spring is for high idle). 26. Spring seat. 27. Over fueling spring. 28. Thrust collar. 29. Load stop lever. 30. Carrier
and governor weights. 31. Sleeve levers. E. Orifice for dashpot.
in compression and move thrust collar (28) for-
From fuel transfer pump (11), fuel under
ward. As thrust collar (28) moves forward, the
pressure, fills the housing for the fuel injection
connecting linkage will cause sleeve control shafts
pumps (14). Pressure of the fuel in housing (14) is
(19) to turn.' With this movement of the sleeve
controlled by bypass valve (12). Pressure of the
control shafts, levers (31) will lift sleeves (32) to
fuel at FULL LOAD is 30 5 psi (2.1 0.4
make an increase in the amount of fuel sent to the
kg/cm2). If the pressure of fuel in housing (14)
engine cylinders.
gets too high, bypass valve (12) will move (open)
to let some of the fuel return to the inlet of fuel
When starting the engine, the force of over fuel-
transfer pump (11).
ing spring (27) is enough to push thrust collar (28)
to the full fuel position. This lets the engine have
Lever (15) for the governor is connected by
the maximum amount of fuel for injection when
linkage and governor springs (25) to the sleeve
starting. At approximately 400 rpm, governor
control shafts (19). Any movement of lever (22)
weights (30) make enough force to push spring
will cause a change in the position of sleeve control
(27) together. Thrust collar (28) and spring seat
shafts (19).
(26) come into contact. From this time on, the
governor works to control the speed of the engine.
When lever (15) is moved to give more fuel to
the engine, lever (22) will put governor springs (25)
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