Figure 3-5. Engine overspeed governor, showing adjusting points.

TM 5-4320-258-34

(4) If the engine did not shut off as the

(2) Disconnect the electrical leads from the

result of the tripping of the overspeed governor, the

terminals at the top of engine overspeed governor. Tag

overspeed governor requires adjustment. If the engine

leads to facilitate reassembly.

stopped before the tachometer indicated 2650 rpm, the

(3) Remove and disassemble the

engine overspeed governor must be adjusted.

overspeed governor and related parts as shown in figure

(5) To adjust the engine overspeed

3-6.

governor, loosen the lock screw (3, fig. 3-5) that

secures the cap (2) in position. To decrease the engine

shutoff speed, rotate the cap clockwise. To raise the

engine shutoff speed, turn the cap counterclockwise.

Tighten the lock screw.

1. Cap screw

2. Lock washer

3. Overspeed governor

4. Cap screw

5. Lock washer

6. Governor arm

7. Nut

8. Lock washer

1. Reset button

9. Cap screw

2. Cap

10. Adapter

3. Lock screw

11. Governor drive shaft

Figure 3-6. Engine overspeed governor and related

Figure 3-5. Engine overspeed governor, showing

parts, exploded view.

adjusting points.

c. Cleaning and Inspection.

(6) Recheck the speed at which the

(1) Wipe the exterior of the engine

overspeed governor stops the engine as directed in

overspeed governor with a cloth dampened with

steps (1) through (3) above. Readjust until the engine

cleaning solvent (FED. Spec. P-D-680); dry thoroughly.

shuts off at 2700 rpm. Replace the engine overspeed

Take care to prevent solvent from entering the interior

governor if it cannot be adjusted.

of the unit.

(7) Reconnect the engine speed governor.

(2) Wash all remaining parts with cleaning

b. Removal.

solvent (FED. Spec. P-D-680). Remove the grease

(1) Remove the tachometer drive from the

governor arm (TM 5-4320-258-12)

3-9