Check For Loose Hardware; Service Air Filter(Kawasaki Units) - Exmark METRO 21 Operator's Manual

Maintenance
Figure 21
1. Cutting angle
8. Check the balance of the blade by placing the
center hole of the blade over a nail or screwdriver
shank clamped horizontally in a vise (Figure 22).
If either end of the blade rotates downward, file
that end (not the cutting edge). The blade is
properly balanced when neither end drops.
Figure 22
1. Blade
2. Vise
9. For Installation: Make sure to grasp the end of
the blade using a rag or a thickly padded glove.
For Blade Brake Clutch Units: Install a sharp,
balanced Exmark blade, the accelerator, the
anti-scalp cup, and the blade nuts. The sail of
the blade must point toward the top of the lawn
mower housing for proper installation. Torque
the blade nuts to 15-27 ft-lb (20-37 N m).
For Units without a Blade Brake Clutch: Install a
sharp, balanced Exmark blade, the accelerator,
and blade bolt. The sail of the blade must point
toward the top of the lawn mower housing for
proper installation. Torque the blade nuts to 50
ft-lb (68 N m).
DANGER
Operating the lawn mower without the
accelerator in place can cause the blade to
flex, bend, or break. Thrown objects from a
broken blade can result in serious injury or
death to the operator or bystanders.
Do Not operate the lawn mower without the
accelerator.
2. Cutting edge radius
3. Screwdriver
10. Return the lawn mower to its upright position.
11. Connect the wire to the spark plug.

Check for Loose Hardware

Service Interval: Before each use or daily
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Visually inspect machine for any loose hardware
or any other possible problem. Tighten hardware
or correct the problem before operating.
Service Air Filter
(Kawasaki Units)
Service Interval: Every 25 hours—Clean
Note: Do Not operate the engine without the air
filter assembly; extreme engine damage will occur.
1. Stop engine, wait for all moving parts to stop.
2. Disconnect the wire from the spark plug
(Figure 10).
3. Remove the cover and clean it thoroughly.
26
the foam pre-cleaner
(Kawasaki Units).
Every 300 hours—
Replace the paper air
filter (Kawasaki Units).
(May need more often in
dusty conditions. See
the Engine manual for
additional information.)