Exmark metro 21 Operator's Manual page 42

Problem
Engine runs rough
Lawn mower or engine
vibrates excessively
Uneven cutting pattern
Discharge chute plugs
Lawn mower does not self-
propel (Self-Propelled Models
Only)
Possible Causes
1. The wire is not connected to
the spark plug.
2. The spark plug is pitted, fouled,
or the gap is incorrect.
3. The throttle lever is not in the
Fast position.
4. The air filter element is dirty
and is restricting the air flow.
1. The blade is bent or is out of
balance.
2. The blade mounting bolt is
loose.
3. The underside of the lawn
mower deck contains clippings
and debris.
4. The engine mounting bolts are
loose.
1. All four wheels are not at the
same height.
2. The blade is dull.
3. You are mowing in the same
pattern repeatedly.
4. The underside of the lawn
mower deck contains clippings
and debris.
1. The throttle lever is not in the
Fast position.
2. The cutting height is too low.
3. You are mowing too fast.
4. The grass is wet.
5. The underside of the lawn
mower deck contains clippings
and debris.
1. The self-propel drive cable is
out of adjustment or is
damaged.
2. There is debris under the belt
cover.
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Corrective Action
1. Connect the wire to the spark
plug.
2. Check the spark plug and adjust
the gap if necessary. Replace
the spark plug if it is pitted,
fouled, or cracked.
3. Move the throttle lever to the
Fast position.
4. Clean the air filter pre-cleaner
and/or replace the paper air
filter.
1. Balance the blade. If the blade
is bent, replace it.
2. Tighten the blade mounting bolt.
3. Clean the underside of the lawn
mower deck.
4. Tighten the engine mounting
bolts.
1. Place all four wheels at the
same height.
2. Sharpen and balance the blade.
3. Change the mowing pattern.
4. Clean the underside of the lawn
mower deck.
1. Move the throttle lever to the
Fast position.
2. Raise the cutting height.
3. Slow down.
4. Allow the grass to dry before
mowing.
5. Clean the underside of the lawn
mower deck.
1. Adjust the self-propel drive
cable. Replace the cable if
necessary.
2. Clean the debris from under the
belt cover.