Exmark Commercial 21 4500-686 Rev. B - Manual (Page 31)

Maintenance
3. If the lawn mower does not self propel with bail
engaged, tighten the belt by turning the drive
cable nuts clockwise. To maximize belt life, Do
Not overtighten the belt.
If the lawn mower creeps forward without the
bail engaged, loosen the belt by turning the drive
cable nuts counterclockwise.
Figure 33
1. Adjustment of drive cable nuts
4. Reinstall the belt cover by pushing down on the
rear first and then snapping the front onto the
mower housing.
5. Check the operation for desired drive control.
6. Repeat steps 2 through 5 as necessary for further
adjustment.
Note: Adjustment to obtain desired ground
speed at full bail travel may be made in order to
accommodate slower speeds.
Adjusting the Blade
Brake Cable
(Blade Brake Clutch Units
Only)
Adjust whenever a new blade brake cable assembly
is installed or if the blade control lock lever does not
operate properly.
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug.
3. Remove the belt cover by pulling upward on the
back of the cover to unsnap the front and back
cover tabs (see Figure 32). Remove any debris
under the cover.
4. Loosen the cable clamp screw until the cable
conduit slides (see Figure 34).
Figure 34
1. Spring 3. Cable clamp screw
2. Cable conduit
5. Pull the cable until there is approximately 1/8
inch in slack. Do Not put tension on the spring.
6. Tighten the screw to lock the adjustment in place.
7. Reinstall the belt cover by pushing down on the
rear first and then snapping the front onto the
mower housing.
8. Connect the wire to the spark plug.
9. Check the operation of the blade control lock
lever (see Figure 13). The lever must reset itself
to lock out the blade control bail. If it does not,
repeat steps 4 through 8.
10. Perform the “Checking the Blade Brake Clutch
(Blade Brake Clutch Units Only)” procedure in
Operation.
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