Exmark Commercial 21 850 - Manual (Page 18)

Operation
Figure 14
1. Mulch plug 3. Lip
2. Discharge door 4. Mower housing
4. Lower the discharge door.
• Removing the Mulch Plug:
Note: When grass is thick and lush, clippings
may collect on and around the discharge tunnel
plug. This may make it difficult to remove the
plug. Clean the plug thoroughly after each use.
1. To remove the mulch plug, raise the discharge
door and pull the mulch plug out of the
discharge tunnel.
2. Lower the discharge door.
Checking the Blade Brake Clutch
(Blade Brake Clutch Units Only)
Check the Blade Brake Clutch (BBC) system before
each use to ensure that it is operating properly.
Normal Test:
1. Stop the engine and wait for all moving parts to
stop.
2. Move the lawn mower onto a paved surface in
a non-windy area.
3. Set all four wheels to the 2 1/2 inches (6.4 cm)
cutting height (see Figure 16 and Figure 17)
4. Take a half sheet of newspaper and crumple
it into ball small enough to go under the deck
(about 3 inches or 7.6 cm in diameter) as shown
in Figure 15.
Figure 15
1. Crumpled newspaper 2. 5 inches (12.7 cm)
5. Place the ball of newspaper 5 inches (12.7 cm) in
front of the lawn mower.
6. Start the engine.
7. Push the blade control lock lever forward to
release the blade control bail (Figure 4).
8. Squeeze the blade control bail against the handle.
blade should engage.
9. Release the blade control bail. You should hear a
“bang.” The blade should stop in three seconds.
The blade control lock lever should reset to lock
the blade control bail.
10. Immediately push the lawn mower over the
newspaper ball.
11. Stop the engine and wait for all moving parts to
stop.
12. Walk around the lawn mower to check for the
newspaper ball. If the ball did not go under the
deck, repeat steps 6 through 11.
13. Pull the lawn mower away from the newspaper.
If the newspaper ball unravels or is shredded,
the blade has not properly stopped, resulting
in an unsafe operating condition. Contact an
Authorized Service Dealer.
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