Troy-Bilt 78 Benutzerhandbuch

The engine speed is controlled by a balance between 

the force applied by a spring (pulling the throttle open) and 
a flyweight mechanism within the engine applying force to 
the governor arm (pushing the throttle closed).               
See Figure 4.41.

NOTE: While the mechanism is simple and robust, 

it is important to pay attention when working 
on parts near the governor. Binding caused 
by interference with mis-routed lines or 
cables may make the governor unrespon-
sive.

NOTE: When a governed engine “hunts”, it is gen-

erally an indication of a lean fuel/air mixture, 
rather than a problem with the governor.

To remove the governor arm from the governor shaft:

1.

Remove the fuel tank by following the steps 
described in the Fuel Tank section of this chapter.

NOTE: Mark or note which holes the spring and 
linkage was in to ensure they go back in the same 
holes.

2.

Unhook the governor spring.

3.

Loosen the nut and clamp bolt. See Figure 4.42.

4.

Carefully spread open the seam on the arm.

5.

Carefully slide the Governor arm off of the governor 
shaft.

6.

Unhook the governor linage and throttle return 
spring.

To install the governor arm:

1.

Rotate the governor shaft clockwise until it stops.

2.

Slide the arm onto the shaft. The flat on the top of the shaft should be roughly parallel to the arm.                  
See Figure 4.42.

NOTE: There is a hairpin clip that keeps the governor shaft from sliding into the engine. It may be necessary to 
hold the shaft while sliding the arm on to prevent the hairpin clip from “popping off” and allowing the governor 
shaft to fall into the engine.

3.

Tighten the nut on the clamp bolt to secure the arm.

4.

Attach the governor linkage and spring.

5.

Adjust the governor to maintain top no-load speed as described in a previous section of this chapter.

Spring tension

Governor action

Loosen nut

Spread here

For Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com