Governor - TM-10-3930-630-120085

TM 10-3930-630-12

(5)Remove nuts (26) and lockwashers (27) and

remove carburetor (32) and governor (28) from

manifold.

(6) Lift governor, gaskets (29) and spacer (30)

from carburetor. Remove elbow (7) from carburetor.

(7) Remove studs (31) from carburetor.

d. Installation.

(1) Install studs (31, fig. 445) in carburetor

(32).

(2) Install new gaskets (29), spacer (30) and

governor (28) on carburetor.

(3) Install assembled carburetor and governor

on manifold, using a new gasket. Carburetor studs

should extend through manifold flange.

(4) Secure carburetor in position with nuts (26)

and lockwashers (27).

(5) Install elbow (7) in carburetor and connect

fuel hose (17) to elbow.

Figure 4-48. Governor adjustment

(6) Slide air inlet hose on carburetor and

tighten clamp.

c. Removal. Refer to paragraph 4-58 to remove

(7) Connect throttle cable (fig. 447) and choke

governor.

cable to carburetor levers.

c. Installation. Refer to paragraph 4-58 and install

(8) Operate engine and adjust carburetor (b

governor.

above).

(9) Close left side panel

4-60.

Fuel Pump

4-59.

Governor

a. General. The mechanically operated fuel pump

is located on the left front side of the engine below the

a. General The velocity type governor is mounted

air cleaner.

between the carburetor and manifold. Operation of the

b. Pressure Test.

governor prevents the engine speed from exceeding

(1) Open left side panel

2450 rpm. Air mixed with gas flows through the

(2) Disconnect fuel outlet hose (17, fig. 4-45)

governor throat. Velocity of the air creates a pressure

from fuel pump. Use appropriate fittings and connect a

above the governor valve. A regulating spring is

0-15 psi pressure gage between fuel pump and

attached to the throttle valve and tends to keep the

carburetor.

valve open. When the pressure above the valve

(3) Start engine and allow to reach operating

exceeds the force exerted by the spring the valve will

temperature. Check pressure on gage at idle and

move toward the closed position. The closing action of

maximum speed. At 1800 rpm gage should register

the valve will exactly balance he spring and when this

between 1 to 214 psi.

occurs governing action takes place and maximum

(4) If pressure is not within limits described

speed is fixed at this point. An adjusting screw varies

above, replace fuel pump.

spring tension and thereby regulates top speed.

(5) Remove gage and connect hose (17) to

b. Adjustment.

fuel pump. Stop engine and close side panel.

(1) Start engine and allow engine to reach

c. Removal

operating temperature.

(1) Close fuel tank shutoff cock (46, fig. 445).

(2) Open left side panel

(2) Open left side panel.

(3) Adjust accelerator and choke cable

(3) Disconnect fuel hose (6) from fuel filter

operation (para 4-58) if necessary.

(52).

(4) Depress accelerator and check maximum

(4) Disconnect hose (17) from fuel pump (21).

speed of engine. Speed should be 2350 to 2450 rpm

Remove screws (19) and lockwashers (20) and remove

(5) If engine speed is not within the above

fuel pump (21) from side of engine. Remove gasket

limits, adjust governor with the adjusting screw (fig. 4-

(22).

48). The screw is located on the left bottom side of the

(5) Remove fuel filter (52) and fittings from

governor. Turn screw clockwise to increase engine

fuel pump.

speed and counterclockwise to decrease engine speed.

d Installation.

(6) Stop engine and close left side panel

(1) Install fittings (8, 16, and 18, fig. 4-45) in fuel

4-57