TM 55-2815-574-24
0099
ADJUSTMENT
1.
Set governor (Figure 3, Item 7) switches (Figure 3, Items 1 and 2) and potentiometers
(Figure 3, Items 3, 4, 5, and 6).
a.
Position switch S1 (Figure 3, Item 1) to the OFF position.
b.
Position switch S2 (Figure 3, Item 2) to the ON position.
c.
Set GAIN potentiometers (Figure 3, Item 5) to second division from the zero position.
NOTE
The throttle potentiometers and the governor actuator operate synchronously.
Therefore, there is no delay so the DROOP adjustment screw must remain in the full
counterclockwise position.
d.
Set DROOP potentiometers (Figure 3, Item 3) to the full counterclockwise position.
e.
Set S1 potentiometers (Figure 3, Item 4) to the third division from the zero position.
2.
Start the engine TM 55-1925-205-10.
NOTE
If engine does not idle at 800 RPM, the speed potentiometers (Figure 3, Item 6) must be
adjusted.
3.
Operate engine at 800 RPM.
4.
Adjust the speed potentiometers (Figure 3, Item 6) until engine maintains 800 RPM.
NOTE
The engine should not be under load while adjusting the I and GAIN.
5.
Finalize the S1 and GAIN settings.
NOTE
The actuator lever may need to be disturbed to make it oscillate.
a.
Turn the GAIN potentiometers (Figure 4, Item 5) clockwise slowly until actuator lever (Figure 4, Item 1)
oscillates.
b.
Turn the GAIN potentiometers (Figure 4, Item 5) counterclockwise slowly until the actuator lever
(Figure 4, Item 1) stops oscillating.
NOTE
The gain adjustment is set correctly when the actuator lever is disturbed and it
oscillates three to five times getting slower on each oscillation until it stabilizes.
c.
Disturb the actuator lever (Figure 4, Item 1) and verify that it oscillates three to five times getting
slower and slower.
d.
Operate the vessel and verify that the load-to-performance change is satisfactory.
NOTE
If the vessel s performance is satisfactory, skip to Step 7.
e.
Turn the GAIN potentiometers counterclockwise one setting.
0099-4