Quantcast AIR FUEL RATIO CONTROL - TM-5-2815-232-140150

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WOODWARD UG8 LEVER GOVERNOR
TESTING AND ADJUSTING
9.
Do Steps I thru 8 to check the speed droop and
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adjust again if needed.
SPEED DROOP ASSEMBLY
AIR FUEL RATIO CONTROL
8. Droop cam. 9. Screw. 16. Droop lever. A. Speed
droop setting.
The UG8 Lever governors are equipped with an
air fuel ratio control. Most adjustments are made at the
SPEED DROOP CHART
factory or when the unit is rebuilt and there is a test
Droop Percentage
Distance A
bench available to make the adjustments. The following
3
8.33 mm (.328 In.)
adjustment can be used to control acceleration smoke
5
6.76 mm (.266 in.)
and engine response.
10
3 58 mm (.141 in)
Adjustment
NOTE:  Dimension (A) is an approximate dimension.
The final adjustments must be determined with the
NOTE: Engine must be shutdown before making this
engine running.
adjustment to keep dirt and foreign material out of the
governor.
4.
Install the air fuel ratio control on the governor.
See Steps 12 thru 16 in the Adjustment for Zero
1.
Remove the cover assembly and shut-off
Droop.  Start the engine and run to get the
actuator as a unit from the top of the governor.
engine to the normal temperature of operation.
2.
Turn adjusting screw (I) clockwise to reduce
5.
Put a load on the engine to get maximum full
smoke or counterclockwise to increase engine
load. Make a note of the full load rpm.
response.
6.
Remove all load from the engine and make a
3.
Turn the adjusting screw 1/2 turn or less in the
note of the no load high idle rpm.
desired direction.
7.
Find the difference of the no load high idle rpm
4.
Replace the top cover assembly and shut-off
and the full load rpm. Divide the difference by
actuator on the governor.
the full load rpm and multiply times 100. The
result is the percent of speed droop.
5.
Start the engine and check the acceleration
smoke and engine response to see if further
No load high idle speed full load rpm X 100 = % of
adjustment is necessary.  If necessary repeat
Full load rpm
speed droop
Steps I, 2 and 3.
8.
If the speed droop is not correct, stop the engine
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and move droop cam (8) toward speeder plug
(7) to increase speed droop, or move away from
LOCATION OF ADJUSTMENT SCREW
the speeder plug to decrease speed droop.
1. Adjusting screw.
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