TM 5-3825-226-24
Checking Balance Point (Full Load Speed)
The balance point for the engine is:
1.
At full load speed.
2.
The point where the load stop pin is against the
load stop.
3.
The point where the engine gets the maximum
amount of fuel per stroke.
4.
The point where the engine has the most
horsepower 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 terminal
screw (I) 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 continuity
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.
2-64
