Exmark COMMERCIAL 21, Operator'S Manual

Page: 32 / 40

Maintenance
WARNING
Grass clippings and other objects can be thrown
from an open discharge tunnel. Thrown objects
can cause serious injury or kill the operator or
bystanders.
Never start or operate the lawn mower unless one
of the following is true:
• Mulch Mode:
• The discharge tunnel plug is locked
securely in the discharge tunnel.
• The discharge tunnel door is closed
against frame.
• Bag Mode:
• The discharge tunnel plug is removed.
• The grass bag is locked in place.
• The discharge tunnel door is closed
against bag.
• Optional Rear Discharge Mode:
• The optional rear discharge deflector is
locked in place.
• The discharge tunnel door is closed
against deflector.
Cleaning Under the Belt
Cover (Self-Propelled Units
Only)
Service Interval: Every 50 hours
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug.
3. Pull upward on the back of the cover to unsnap
the front and back cover tabs (see Figure 28).
4. Lift off the cover and brush out all the debris
around the belt area.
5. Install the belt cover by pushing down on the rear
first and then snapping the front onto the mower
housing.
6. Connect the wire to the spark plug.
Cleaning the Blade
Brake Clutch Shield
(Blade Brake Clutch Units
Only)
Service Interval: Every 50 hours
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug.
3. Drain the gasoline from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter
section.
4. Tip the lawn mower onto its right side (air filter
up).
5. Remove the blade nuts and the blade (see
Figure 22).
Figure 32
1. Screws 2. BBC Shield
6. Remove the three screws holding the BBC shield
onto the unit (see Figure 32).
7. Remove the BBC shield and brush or blow all
the debris from under the shield and around the
BBC system.
8. Install the BBC shield. Tighten the screws to
secure the BBC shield to the deck.
9. Install the blade and the two blade nuts. Torque
the blade nuts to 44-56 ft-lb (60-76 N m).
10. Turn the lawn mower upright.
11. Connect the wire to the spark plug.
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