Cub Cadet 4 x 2 Big Country - Poly Bed & Steel Bed - Manual (Page 54)

4 X 2 Drive System - (Steel Bed)
50
4.6. Start the engine and check idle speed. The
engine should idle at 1,400 RPM + 150. Correct
the idle speed if it is not in this range. If it is
higher, the clutch will drag.
4.7. The idle speed is controlled by the amount of
tension on the small spring on the governor link-
age. See Figure 4.7.
4.8. The throttle stop on the carburetor should be set
so that no-load engine speed never falls below
1,000 RPM. See Figure 4.8.
NOTE: It is necessary to remove the air filter
assembly to reach the throttle stop screw.
• If the throttle stop is set too high it will over-ride
the governed idle. This may cause belt drag,
which will interfere with gear selection.
• If the throttle stop is set too low, the engine may
stall when load is suddenly removed at the same
time the throttle is returned to idle.
4.9. If the vehicle fails to reach full speed (20 MPH)
or has lost performance, and the belt is good,
confirm that the engine still achieves it’s speci-
fied top-no-load speed and that the CVT
responds accordingly.
4.10. Top-no-load engine speed should be 3,850 RPM
+ 150. Confirm this with a tachometer.
See Figure 4.10.
4.11. Watch the travel of the belt as the engine speed
increases from idle speed to top-no-load speed.
4.12. Engine top-no-load speed is adjustable using
the vertical phillips head screw on the governor
linkage. See Figure 4.12.
Figure 4.7
Idle speed = 1,370 RPM
Governed
idle Spring
Figure 4.8
Throttle
stop screw
Linkage
back
stop
against
pulled
Figure 4.10
TNL
Speed
= 3,870 RPM
Driven pulley sheaves are
fully separated
Figure 4.12
NOTE: Air filter
removed for clarity
Top-no-load
adjusted here
speed