HUSTLER ATZ, Operator'S Manual, Page: 35 / 48

604243 4-7 REV C
performance is affected. The reason is simple. The media in the
filter must be porous to allow air to pass through it. When dirty
air passes through the filter, the dirt plugs some of the holes in
the media and actually acts as part of the filter media. When the
next round of dirt enters, the first dirt helps filter out even
smaller particles making the filter more efficient at stopping dirt
from entering the engine. This is referred to as barrier filtration.
Of course, at some point the filter media becomes too clogged
to allow air to pass.
The mowing conditions will determine the frequency of air
filter element changing.
Air restriction indicator
These units have an air restriction indicator installed in the air
cleaner. Figure 4-9
Replace the element whenever the restriction indicator
reaches the change filter red line. Check the indicator daily and
replace element as needed or annually whichever occurs first.
Reset the indicator by pushing in on the yellow button after
each element change. Figure 4-9
General Engine Maintenance
Detailed instructions and recommendations for break-in and
regular maintenance are specified in the Engine Owner’s
manual. Please refer to this manual for engine servicing,
lubricating oil levels with quality and viscosity
recommendations, bolt torques, etc. The engine warranty is
backed by the engine manufacturer.
Fuel Evaporation System Filter
Some Hustler ® ATZ mowers have a fuel evaporation system
filter. This filter must be checked and replaced every 500 hours
or annually whichever comes first. Figure 4-10
Belts
Inspect belts frequently for wear and serviceability. Replace a
belt that shows signs of severe cuts, tears, separation, weather
checking and cracking, or burns caused by slipping. Slight
Figure 4-9
Reset
button
Indicator
Figure 4-10
Figure 4-11
Fuel evaporation
system filter
Mowers prior to serial number 13051286
Fuel evaporation
system filter
Mowers after serial number 13051286