Toro GROUNDSMASTER 345 - Manual (Page 17)

TORO GM 345 Ford VSG-411 Gas Engine
Notes
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15
Anti-Surge Adjustment.
1. Move the throttle rapidly from SLOW to FAST. The engine should not surge, if the engine surges proceed to
step 2.
2. Check the V-belts from the engine to the governor pulley and assure that they are tight.
•
The belt is adjusted to 45 lbs of tension on a belt gauge for a new belt.
•
A used belt is re-tensioned to 28 lbs.
•
The replacement belt PN is 67-8510.
3. Loosen the jam nut that retains the anti-surge screw. Rotate the screw clockwise 1/8 of a turn at a time until
the surging stops.
4. Check the low and high idle speed to be sure that there is no change in the initial settings. If the idle speed
has increased, the anti-surge screw has been turned in too far and it must be backed out.
Other things to check when engine surges:
A. Carburetor too rich or lean.
B. Binding in the throttle linkage.
C. Governor worn internally.
Governor Spread or Sensitivity Adjustment.
Governor spread is the difference between the no load governed speed, and the full load speed.
For the governor to work correctly this spread should be 5 to 10 percent.
To check governor spread, check and record the no-load high idle speed and compare this to the loaded high
idle speed.
To increase the spread adjust the adjustment bolt to position the spring farther away from the lever hub. To
decrease the spread position the spring closer to the hub.