Starter; Ignition; Fuel System - Kohler COM7.5 Service Manual

4.3 Starter

Check the starter if the generator set engine does not
crank. Check the battery voltage and connections
before proceeding. Check for a locked rotor or other
fault condition that may have shut down the unit. Correct
the fault condition and reset the controller to clear a fault
shutdown.
Note: Always check the wiring and connections before
replacing components.
The crank cycle attempts to start three times, cranking
for 15 seconds and then resting for 15 seconds between
attempts. The fault LED on the control board lights to
indicate an overcrank shutdown; reset the controller if
the LED lights during these tests.
Move the generator set master switch to Start and check
for 12 VDC to the starter relay on lead 71 during the
crank attempt. See Figure 4-5. If there is no voltage to
the starter during the crank cycle, check the connections
and the continuity of the wiring harness leads. Then
check for voltage from the controller at P2-1 (see the
wiring diagram, Section 7). If there is no voltage at P2-1
during cranking, replace the control board.
1. Starter motor
2. Starter relay (crank relay)
Figure 4-5 Starter Components
26 Section 4 Component Testing and Adjustment
1
2
photos4-4
To test the starter relay, check for 12 VDC to the starter
motor during the crank attempt. If there is voltage to the
relay but not to the starter motor, check the connection
between the relay and the starter motor.
connection is good, replace the relay.
If there is voltage to the starter motor but the starter
motor does not crank the engine, refer to the Kohler
CH20 Engine Service Manual for starter service
information. The generator set engine uses a solenoid
shift electric starter.

4.4 Ignition

The COM7.5 engine uses a capacitive discharge
ignition system. Refer to the Engine Service Manual for
ignition service information. See Section 2.6 of this
manual for spark plug information.

4.5 Fuel System

WARNING
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
Fire.
Can cause severe injury or death.
Do not smoke or permit flames or
sparks near fuels or the fuel system.
Combustible materials. A fire can cause severe injury or
death. Generator set engine fuels and fuel vapors are
flammable and explosive. Handle these materials carefully to
minimize the risk of fire or explosion. Equip the compartment
or nearby area with a fully charged fire extinguisher. Select a
fire extinguisher rated ABC or BC for electrical fires or as
recommended by the local fire code or an authorized agency.
Train all personnel on fire extinguisher operation and fire
prevention procedures.
If the
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