Exmark NAV20KC - Manual (Page 41)

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6.2 MOWER CUTS UNEVENLY.
a) Check air pressure in drive tires; 15 psi.
Semi-pneumatic casters do not require inflation.
A more uniform cutting height may be obtained with higher tire pressure on
rough terrain.
A lower tire pressure provides more flotation.
b) Check deck support pins are secure and correct spacers are position under
hairpins.
c) Check deck leveling (See Adjustments in Deck Manual).
Note: The front of the mower deck will be approximately 1/4” lower than the
back of the mower deck. This is the “rake” of the deck.
d) Check the distance from the bottom edge of the deck skirt to the tip of each
blade. Measurement should be consistent between all blade tips.
6.3 ENGINE WILL NOT START.
a) Make sure the battery has a full charge. See section 4.1.2 for charging
instructions.
b) Be sure the throttle control is midway between the “SLOW” and “FAST”
positions, and the choke is in the “ON” position for a cold engine or the
“OFF” position for a warm engine.
c) Make sure there is fuel in the fuel tank and that the fuel valve is open.
d) Make sure the parking brake is set and speed control levers in the neutral
position.
e) Check that the PTO is disengaged, park brake is engaged and speed
control is in “Neutral”.
f) Check that the spark plug wires are properly connected.
g) Check for loose or faulty wiring connections.
h) Check for corrosion at all wiring connections. Even minor corrosion may
cause a faulty connection. Clean connector terminals thoroughly with
electrical contact cleaner, apply dielectric grease and reconnect.
i) Check safety switch adjustment (See Section 4.2.5).
NOTE: When disconnecting electrical connectors DO NOT pull on the
wires to separate the connectors.
NOTE: After carefully checking the above steps, attempt to start the
engine. If it does not start, contact your authorized Exmark service dealer.
IMPORTANT: It is essential that all operator safety mechanisms be
connected and in proper operating condition prior to mower use.
When a problem occurs, do not overlook the simple causes. For example:
starting problems could be caused by an empty fuel tank.
The following table lists some of the common causes of trouble. Do not attempt
to service or replace major items or any items that call for special timing of
adjustments procedures (such as valves, governor, etc.). Have this work done
by your Engine Service Dealer.