WOODWARD UG8 LEVER GOVERNOR
TESTING AND ADJUSTING
WOODWARD UG8 LEVER GOVERNOR COMPENSATING ADJUSTMENT Although the governor may appear to be operating satisfactorily at no load, high overspeeds and underspeeds after load changes and slow return to normal speed are the results of incorrect compensation adjustments. After the temperature of the engine and the oil in the governor have reached normal operating values, make compensation adjustments with the engine running at no load conditions.
UG8 LEVER GOVERNOR 1. Compensation pointer. 2. Nut. 3. Plug. 1.
Loosen nut (2) that holds compensation pointer (1) and move the pointer up as far as it will go. Tighten the nut.
2.
Remove plug (3) from the base of the governor to get access to the needle valve.
3.
Use a screwdriver and turn the needle valve three to five turns in a counterclockwise (open) direction. Make sure the screwdriver engages with the shallow slot of the compensating needle valve and not in the deep slot that is at right angles to the shallow screwdriver slot.
4.
Let the engine surge for approximately 30 seconds to help remove air from the governor oil passages.
5.
Loosen nut (2) that holds compensation pointer (1) and move the pointer down as far as it will go. Tighten the nut.
6.
Slowly turn the needle valve in a clockwise direction until the engine surge just stops.
7.
Now check the number of turns the needle valve is open. To find the number of turns the needle valve is open, close the valve completely and make a note of the number of turns needed to close the valve.
8.
Open the needle valve to the same position at which the engine did not surge (Step 6).
9.
Move the governor linkage to change the engine speed. If the engine does not surge, and the needle valve is 1/2 to 3/4 of a turn open, the governor adjustment is correct. Install plug (3) in the base. If the needle valve is more than 3/4 of a turn open, do the steps that follow.
10.
Loosen nut (2) and move compensation pointer (1) up two marks on the pointer scale.
11.
Turn the needle valve three to five turns in a counterclockwise direction.
12.
Let the engine surge for approximately 30 seconds to help remove air from the governor oil passages.
13.
Slowly turn the needle valve in a clockwise direction until the engine surge just stops.
14.
Now check the number of turns the needle valve is open. To find the number of turns the needle valve is open, close the valve completely and make a note of the number of turns needed to close the valve.
15.
Open the needle valve to the same position at which the engine did not surge (Step 13).
16.
Move the governor linkage to change the engine speed. If the engine does not surge, and the needle valve is 1/2 to 3/4 of a turn open, the governor adjustment is correct. Install plug (3) in the base. If the needle valve is more than 3/4 of a turn open, do Steps 10 thru 16 again.
A needle valve that is opened less than 1/2 turn will cause a slow return of the engine to normal speed after a load change. If the compensation pointer is too far toward the maximum position, the engine speed change will be too great when the load changes. 128
