Exmark 4500-686 Rev. B User Manual

Maintenance

The fuel filter (screen) element is located inside the
fuel tank (if applicable).

Note: The ECSHN21 does not have a removable
fuel tank.

1. Stop the engine and wait for it to cool down.

Note: Drain gasoline for a cold engine only.

2. Disconnect the wire from the spark plug

(Figure 11).

3. Close the fuel valve.

4. Disconnect the fuel line by loosening the tube

clamp at the carburetor.

5. Open the fuel valve by turning the lever to the

open position.

6. Drain the gasoline completely from the tank and

fuel line into an approved fuel container.

7. Remove the fuel tank from the mower.

8. Close the fuel valve.

9. Pour a small amount of fuel in the fuel tank, move

the fuel around in the tank, and pour it out into
an approved fuel container.

10. Install the fuel tank and fuel line.

Adjustments

Note: Wait for all moving parts to stop and remove
spark plug wire before servicing, cleaning, or making
any adjustments to the unit.

Adjusting the Self-Propel
Drive
(Self-Propelled Units Only)

If the lawn mower does not self-propel or has a
tendency to creep forward when the control bail
is released, adjust the drive cable nuts as shown in
Figure 33.

DANGER

Checking the operation of the mower with the
belt cover removed will allow debris to be thrown
in the operator’s or bystander’s direction and can
result in serious personal injury or death.

Do Not operate the unit when cover is not in
place.

1. Stop the engine and wait for all moving parts to

stop.

2. Remove the belt cover by pulling upward on the

back of the cover to unsnap the front and back
cover tabs. Remove any debris under the cover.

Figure 32

Belt cover tabs