TM 5-3805-260-24
Checking Balance Point (Full Load Speed)
The balance point for the engine is:
1.
At full load speed.
2.
The point the load stop pin is against the load , top.
3.
The point where the engine gets the maximum amount of fuel per stroke.
4.
The point where the engine has the most horse- power output.
5.
The point where an increase in load on the engine puts the engine in a lug condition (a condition in which a
small increase in load makes the engine speed get much less).
Procedure for Checking Balance Point
1.
Connect a tachometer which has good accuracy to the tachometer drive.
TERMINAL LOCATION
1. Brass terminal screw.
2.
Connect a continuity light to the brass ter-minal screw (1) on the cover for the load stop. Connect the other
end of the light to a place on the fuel system which is a good electrical connection.
3.
Start the engine.
4.
With the engine at operating conditions, run the engine at high idle.
5.
Make a record of the speed of the engine at high idle.
6.
Add load on the engine slowly until the con-tinuity light just comes on. This is the balance point.
7.
Make a record of the speed at the balance point.
8.
Repeat Step 6 several times to make sure that the recording is correct.
9.
Stop engine. Make a comparison of the records from Steps 5 and 7 with the information from the ENGINE
INFORMATION plates on the side of the engine or with the information given in the RACK SETTING
INFORMATION.
10.
If the full load speed is not correct, adjust the HIGH IDLE speed to make a change in the full load speed.
11.
If the high idle speed is out of tolerance and the full load speed is correct, look for a weak governor spring or
the wrong governor spring. Both the full load speed and the high idle speed must be in the tolerance given in
the RACK SETTING INFORMATION.
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