Kohler Command Pro ECV850, Service Manual

Page: 49 / 104

Governor System
49 19 690 01 Rev. -- KohlerEngines.com
GOVERNOR
These engines are equipped with an electronic governor or a mechanical governor.
ELECTRONIC GOVERNOR
Components
F
A
B
G
J
H
I
K
E
D
C
A
Governor Control
Unit (GCU)
B
Digital Linear
Actuator (DLA)
C
DLA Bracket
Mounting Nuts
D Wiring Harness
E Connector F
Throttle Body
Assembly
G
Throttle Body Lever
Adapter
H Linkage Spring
I Throttle Linkage J
Plastic Linkage
Retaining Clip
K
DLA to DLA Bracket
Mounting Screws
Electronic governor regulates engine speed at varying
loads. Typical electronic governor includes:
● Digital linear actuator (DLA).
● Throttle linkage.
● Linkage spring.
● Linkage retaining clip.
● Governor control unit (GCU).
Digital Linear Actuator (DLA)
Energizing bi-directional digital linear actuator coils in
proper sequence, causes threaded shaft to move out
of, or back into rotor, in precise linear increments. When
power is removed, actuator shaft remains in position.
DLA must initialize (fully extend) to move throttle plate to
closed position, and partially open for starting. Correct
adjustment of DLA is critical to achieve full range of
throttle plate movement. See Adjustment.
Governor control unit (GCU) senses engine speed
by pulse voltage inputs from EFI ECU module. GCU
regulates engine speed by variable input voltage from a
customer-supplied source.
NOTE: Actual speeds depend on application. Refer to
equipment manufacturer’s recommendations.
Potentiometer Speci fi cations
Wiper Voltage Engine Speed (RPM)
0-1 Low Speed Endpoint
1-9 Variable Speed Endpoint
9-16 High Speed Endpoint
Linkage
NOTE: Throttle linkage spring must be in place and
installed correctly to ensure proper throttle
operation and performance.
Throttle linkage spring will fully open throttle plate if
linkage becomes detached from DLA. This will create an
overspeed condition causing engine to shut down. DLA
shaft will have to be manually screwed back into body,
and then retracted before reassembling linkage.