Exmark NAV20KC - Manual (Page 27)

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a) Stop engine, wait for all moving parts to stop, and remove key. Engage
parking brake.
b) Clean all debris from rotating engine air intake screen and from around
engine shrouding.
c) Clean all debris from around engine and drive belts.
d) For 27HP Kohler units: Swing out the fuel tank and remove debris from
around the oil cooler positioned at right front corner of engine.
4.1.4 Check safety interlock system.
Service Interval: Daily
a) Check starting circuit. Starter should crank with, parking brake engaged,
PTO disengaged and speed control lever in the neutral position. The
operator does not need to be in the seat to start the engine.
Try to start with operator in seat, parking brake disengaged, PTO
disengaged and speed control lever in the neutral position - starter must
not crank.
Try to start with operator in seat, parking brake engaged, PTO engaged and
speed control lever in the neutral position - starter must not crank.
Try to start with operator in seat, parking brake engaged, PTO
disengaged, and the speed control lever forward (out of neutral), starter
must not crank.
b) Check the kill circuits. Run engine at one-third throttle, disengage parking
brake and raise off of seat (but do not get off of machine) engine must stop
after approx. 1/2 second has elapsed (seat has time delay kill switch to
prevent cut-outs on rough terrain).
Run engine at one-third throttle, engage PTO and raise off of seat (but do
not get off of machine) engine must stop after 1/2 second has elapsed.
NOTE: If machine does not pass any of these tests, do not operate.
Contact your authorized EXMARK SERVICE DEALER.
IMPORTANT: It is essential that operator safety mechanisms be connected
and in proper operating condition prior to use for mowing.
4.1.5 Check for loose hardware.
Service Interval: Daily
a) Stop engine, wait for all moving parts to stop, and remove key. Engage
parking brake.
b) Visually inspect machine for any loose hardware or any other possible
problem. Tighten hardware or correct the problem before operating.
4.1.6 Service air cleaner.
Service Interval: 50 hrs.
More often under severe conditions.
See Engine manual for additional information.
a) Stop engine, wait for all moving parts to stop, and remove.
b) Tilt hopper up to gain access to the air cleaner.
c) Loosen retaining clips and remove air cleaner compartment cover.
d) Remove paper element. Check the condition of the paper element.
Replace if dirty, bent or damaged.
e) Check the condition of the inner element. Replace whenever it appears dirty,
typically every other time the paper element is replaced. Clean the base
around the inner element before removing, so dirt does not get into the engine.