F U E L S Y S T E M
TM 5-3805-258-24-1
T E S T I N G A N D A D J U S T I NG
DASHPOT SCREW ADJUSTMENT
(TYPICAL EXAMPLE)
1. Dashpot adjustment screw.
1. Turn dashpot adjustment screw (1) in (clock-
wise) until it stops.
2. Turn dashpot adjustment screw out (counter-
clockwise) 1/2 ± 1/4 turn.
Checking Balance Point
The balance point for the engine is:
1.
2.
3.
4.
At 20 rpm higher than full load speed.
The point where the power adjustment screw is
against the load stop.
The point where the engine has the most horse-
power output.
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
NOTE: It is important, to the correct operation of
the transmission, that the BALANCE POINT is
adjusted to the correct specifications.
NOTE: The rack setting must be correct before
an adjustment is made to the balance point.
1. Connect a tachometer which has good accuracy
to the tachometer drive.
2. Connect a continuity light to the brass terminal
screw (1) on the rear of the governor. Connect
the other end of the light to a place on the fuel
system which is a good electrical ground.
3.
4.
5.
6.
7.
8.
9.
10.
11.
TERMINAL LOCATION
(TYPICAL EXAMPLE)
1. Brass terminal screw.
Start the engine.
With the engine at operating conditions, run the
engine at high idle.
Make a record of the speed of the engine at high
idle.
Add load on the engine slowly until the contin-
uity light just comes on. This is the balance
point.
Make a record of the speed at the balance point.
Repeat Step 6 several times to make sure that
the recording is correct.
Stop engine. Make a comparison of the records
from Steps 5 and 7 with the information given
in the FUEL SETTING INFORMATION.
If the full load speed is not correct; adjust the
HIGH IDLE speed to make a change in the full
load speed.
If the high idle speed is out of tolerance and the
full load speed is correct, look for a weak gover-
nor spring or the wrong governor spring. Both
the full load speed and the high idle speed must
be in the tolerance given in-the FUEL SET-
TING INFORMATION.
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