Troy-Bilt 78 Manual De Usuario

     The Governor gear and cup are located inside the 

crankcase cover. The flyweights and the governor cup are 
inter locked on this family of engines. The governor gear 
and cup are serviced as a complete assembly.                

1.

Remove the engine from the equipment that it pow-
ers.

2.

Remove the crank case cover from the engine by 
following the steps described in Chapter 10: Cam, 
Crankshaft and Piston.

3.

Position the crank case cover over an open vise so 
that the governor gear can pass through its jaws.

4.

Drive out the governor pin using a pin punch.      
See Figure 4.44.

NOTE: There is a washer between the governor 

cup and the crank case cover. this washer 
will fall out when the governor comes out.

5.

Install the governor gear and cup assembly by plac-
ing the washer on the inside of the crank case 
cover. See Figure 4.45.

6.

Apply a small amount of releasable thread locking 
compound such as Loctite® 242 (blue) to the gover-
nor pin.

7.

Position the governor gear and cup assembly with 
the pin in the hole in the crank case cover.

8.

By gently striking the governor cup, drive the gover-
nor pin into the crank case cover until it is flush with 
the out side of the cover.

9.

Install the crank case cover by following the proce-
dures described in Chapter 10: Cam, Crankshaft 
and Piston.

10.

Install the engine onto the equipment it came off of.

11.

Test run the engine in a safe area before returning it 
to service.

Governor pin

Pin punch

Washer

Governor cup

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