REV B 4-6 606835
the cleaning assumes responsibility for the integrity of the
filter from then on. The warranty for air filters expires upon
cleaning or servicing in any manner because the condition of
the filter after servicing is completely out of the filter
manufacturer’s control. Therefore, on a dust ingested engine
failure, there will be no warranty consideration if the air filter
element has been cleaned or serviced in any manner.
A partially dirty air filter element works better than a new
element. Therefore, a dirty filter element is not bad for the
engine unless it is excessively restricting the air flow and
engine 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 4-13
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 4-13
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. Special attention should
be paid to applicable data which will not be duplicated here.
Belts
Inspect belts frequently for wear and serviceability.
Replace a belt that shows signs of:
• severe cuts
• tears
• separation
• weather checking
• cracking
• burns caused by slipping.
A. Air cleaner canister
B. Dust cap
C. Clamp
Figure 4-12
A. Reset button B. Indicator
Figure 4-13
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