Kohler COMMAND CH18-745 User Manual download pdf (Page 46)

5.13

Section 5

Fuel System and Governor

Governor Control Unit (GCU) senses engine speed by

pulse voltage inputs from the ignition modules. The

GCU regulates the engine speed by variable input

voltage from a customer-supplied potentiometer or a

single pole, single throw (SPST) switch.

Potentiometer Specifications:

Adjustment Procedure

The DLA must be in the fully retracted position during

assembly. The full range of throttle plate movement will

not be achieved if the DLA is partially extended when

assembled. Loosen the two DLA mounting plate

screws located on the top of the actuator plate. With

the throttle linkage centered in the U-Clip at the end of

the DLA shaft, slide the DLA bracket assembly back

until the throttle plate is fully open. Torque the

mounting plate screws to 2.5 N·m (22 in. lb.).

Troubleshooting Procedure

Engine starts, but will not continue to run

1. Check the linkage connection between the DLA

and throttle plate.

2. Verify the DLA initializes when power is supplied

(key switch in the start or run position).

3. Test the potentiometer wiper output voltage (if

equipped).

4. Test the SPST switch (if equipped).

5. Check the wire harness and connections.

Engine does not run at the expected speed

1. Check to see that the throttle linkage and DLA

have full range of motion having no mechanical

interference.

2. Test the potentiometer wiper voltage (if equipped).

3. Test the SPST switch (if equipped).

1860 low speed endpoint

variable speed endpoint

3600 high speed endpoint

Wiper Voltage

0-1

1-9

9-16

Engine Speed (RPM)

1860 low speed endpoint

3600 high speed endpoint

Engine Speed (RPM)

Switch Position

Open

Closed

SPST Switch Specifications:

GCU Safety Features

In the event of an engine overspeed condition, the

GCU will shut down the engine by grounding the

ignition modules.

The GCU will shut down the engine by grounding the

ignition when power to the GCU is lost.

Linkage

The throttle linkage spring will fully open the throttle

plate if the linkage becomes detached from the DLA.

This will create an overspeed condition causing the

engine to shut down. The DLA shaft will have to be

manually screwed back into the body, and then

retracted before reassembling the linkage.

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Kohler COMMAND CH18-745 User Manual Page 46

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