Kohler 27EFOZ, Service Manual

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TP-5936 7/04 12 Section 4 Fuel System
4.6 Fuel Pump
The fuel pump transfers fuel from a source to the fuel
injection pump.
Fuel Pump Test Procedure
1. Remove the two leads from the terminals at the
bottom of the fuel pump. The pump terminals are
labeled (--) and (+). See Figure 4-5.
2. Connect the inlet side of the pump to a fuel source.
Disconnect the outlet hose from the fuel filter and
place the hose end in a container to catch the fuel.
3. Connect the positive (+) terminal of the 12-volt
battery to the positive terminal of the fuel pump.
Connect the negative terminal of the fuel pump to
the negative (--) terminal of the battery. You should
hear the pump operate and see the fuel discharge
from the pump outlet. Replace the pump if it does
not operate.
I-940
1. Fuel inlet
2. Negative terminal
3. Positive terminal
4. Fuel outlet
1
2 3
4
Figure 4-5 Fuel Pump
4.7 Governor
The centrifugal, mechanical governor keeps the engine
speed constant by automatically adjusting the amount
of fuel supplied to the engine according to changes in
the load. No regular service is required on the governor.
The factory adjusts the governor during run-in, and
further adjustment should not be needed unless poor
governor control develops after extended generator
usage.
60 Hz generator sets are designed to operate at
57--63 Hz, 1800 rpm under full load and 1890 rpm under
no load.
50 Hz generator sets are designed to operate at
47--53 Hz, 1500 rpm under full load and 1590 rpm under
no load.
Check the engine speed using a frequency meter
connected to the load leads. Loosen the locking nut on
the speed adjusting screw. Turn the screw clockwise to
increase the speed and frequency.
Turn the screw
counterclockwise to decrease the speed. Tighten the
locknut at the new setting. See Figure 4-6.
Governor Adjustment Procedure
1. Loosen the locknut on the speed adjusting screw.
2. Turn the speed adjusting screw clockwise to
increase the speed and frequency or
counterclockwise to decrease the speed.
3. Tighten the locknut at the new setting. See
Figure 4-6.
4. Adjust the voltage regulator. See Section 7.5,
Voltage Regulator Adjustment.
GB-250000A-K
1 2
3
1. Governor
2. Locknut
3. Speed adjusting screw
Figure 4-6 Governor