c. Upper and Lower Governor Cut Off Speeds

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 c. Upper and Lower Governor Cut Off Speeds. (1) Ensure that the fuel pump has been prepared for calibration in accordance with step b, above. (2) Close the idle orifice valve (10, Figure 6-17), throttle leakage valve (8), and pressure control valve (6). Open the fuel flow control valve (5) completely. (3) Adjust the fuel pump speed to 1800 rpm. (4) Adjust the fuel flow control valve (5, Figure 6-17) until the main flowmeter (15) indicates 1275 lbs/hr (575 kg/hr). There must be no air in the main flowmeter (15). (5) Adjust the suction valve (4, Figure 6-16) to get a reading of 7 inches (127 mm) Hg on vacuum gage (7, Figure 6-17). If you cannot get the vacuum gage to indicate 57 inches (127 mm) Hg, check for a restriction in the fuel pump test stand (5, Figure 6-15) filter or in the supply hose (5, Figure 6-16). (6) Open the pressure control valve (6, Figure 6-17) and increase the fuel pump speed until the fuel pump pressure gage (18, Figure 6-17) indicates that fuel pump pressure is just beginning to decrease. This peak fuel pump pressure must be reached at a fuel pump speed of 2010 to 2040 rpm. (7) If the fuel pump speed is less than 2010 to 2040 rpm, increase the speed by adding governor spring shims (10, Figure 6-11). If the fuel pump speed is greater than 2010 to 2040 rpm, decrease the speed by removing shims (10). Each 0.001 inch of shim (10) thickness will cause a change in fuel pump speed of approximately 2 rpm. Shims (10) are available in thick nesses of 0.005, 0.010, and 0.020 inch (0.13, 0.25, and 0.51 mm). (8) After replacing the spring pack cover (5, Figure 6-1 1), and with the fuel pump running in the fuel pump test stand (5, Figure 6-15), open the fuel flow control valve (5, Figure 6-17) completely. Rotate the throttle shaft (45, Figure 6-11) fully clockwise and counter clockwise to help purge air from the fuel pump. When no air is present in the main flowmeter (1 5, Figure 6-17), adjust the main flowmeter as in step (4), above. (9) Adjust the fuel pump speed to 1800 rpm. Turn in the setscrew (28, Figure 6-11), located on top of the cover (23), until the fuel pump pressure gage (18, Figure 6-17) indicates that fuel pump pressure is just beginning to decrease. This peak fuel pump pressure must be reached at a fuel pump speed of 1910 to 1940 rpm. If the fuel pump speed is more or less than 1910 to 1940 rpm, adjust the setscrew (28), located on top of the cover (23), until peak fuel pump pressure is reached at this speed. (10) Lock the throttle shaft (30) into position by turning in the setscrew (28), located on the rear side of the cover (23), until it contacts the throttle shaft stop (34). Tighten the adjusting screw nuts (25 and 27) on the setscrews (28), located on the top and on the rear side of the cover (23), to lock the throttle shaft (30) in position. (11) Remove the locking pliers and universal spring installed to the throttle shaft (30) in step b (11), above. No further adjustments are required to the upper governor. d. Throttle Leakage. (1) Remove the universal spring and locking pliers installed on the throttle shaft (45, Figure 6-11) in step b (9), above, and reinstall so that the throttle shaft is held in the fully dosed position (rotated fully dodkwise). Ensure that the adjusting screw (55), located towards the rear of the fuel housing (66), does not interfere with the movement of the control end (51). (2) Open the throttle leakage valve (8, Figure 6-17) completely, and dose the fuel flow control valve (5) and idle orifice valve (10) completely. Adjust the fuel pump speed to 1800 rpm. NOTE The following adjustment must be made with the test oil temperature between 900 and 100 °F (32° and 38°C). The temperature of the test oil may be reduced if too hot by slowing the fuel pump speed of the fuel pump test stand. If the temperature of the test oil exceeds 135 °F (57°C), however, the test oil must be drained and replaced with new test oil. (3) Using the adjusting screw (55, Figure 6-11), located towards the rear of the fuel pump housing (66), adjust the throttle leakage to 110 cc/min., as indicated by the leakage flowmeter (13, Figure 6-17). (4) Lock the adjusting screw (55, Figure 6-11), located towards the rear of the fuel pump housing (66), by tightening the hexagonal nut (54). Recheck the throttle leakage. 6-37

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