REV D 4-6 604466
IMPORTANT: All oil drips or spills must be cleaned off
of the exhaust system before operating the machine.
Engine Air Filter
Perform engine air filter maintenance per the Maintenance
Schedule shown elsewhere in this manual.
A specially designed dry filter is standard equipment on
these
mowers and supplies clean combustion air to the engine. Figure
4-6
These mowers are equipped with a sa
fety filter. The filter
element slides over the safety filter. Figure 4-7
The safety element does not require servicing unless it
becomes contaminated with
dirt or moisture.
Recommended service procedure
1. Release cla
mps and remove element. Clean the canister
with a damp cloth.
2. Before installing
a new element, inspect it by placing a
bright light inside and rotating the element slowly,
looking for any holes or tears in the paper. Also check
gaskets for cuts or tears. Do not attempt to use a damaged
element which will allow abrasive particles to enter the
engine.
3. Rein
stall the dust cup. Make sure it seals all the way
around the air cleaner body, then tighten the clamps.
Figure 4-6
4. Check all fittings
and clamps periodically for tightness
and inspect hoses for holes or cracks.
5. Periodically check the intake hose for
signs of ingested
dust. Locate and repair the source of ingested dirt.
6. Nev
er operate the machine without an air filter installed.
Overservicing
Overservicing occurs when an air filter element is removed
for
cleaning or replacement before it is necessary. Each time the
filter is removed a small amount of dirt and dust could fall in the
intake system. This accumulated dirt can cause a dusted engine.
It only takes a few grams of ingested dirt over the normal
service life of an engine to cause a dusted engine.
Do not clean the element, but r
eplace with a new element
only. Cleaning used air filter elements, through improper
cleaning procedures, can get dust on the inside of the filter
causing dirt ingestion and engine failure.
It is important to note that whene
ver an air filter element is
cleaned by any method, the person or company performing 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’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
Figure 4-5
Figure 4-6
Pre-cleaner
Canister
Dust cap
Figure 4-7
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