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Figure 4-7
Recommended service procedure
1. Release clamps 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. Reinstall the dust cap. 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. Never 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 replace 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 whenever 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
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
REV G
element. Therefore, a dirty filter element is not bad for the
engine unless it is excessively restricting the air flow and engine
Safety filter
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.
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
recommendations, bolt torques, etc. The engine warranty is
backed by the manufacturer. Special attention should be paid to
applicable data which will not be duplicated here.
Carbon Canister
Some FasTrak
incorporated into the fuel system. Figure 4-8
This is a mandatory feature that is required on all mowers
using gasoline engines that are put into operation in California.
These canisters should be replaced every 5 years or if they
become damaged.
Carbon
canister
Fuel Evaporation System Filter
Some FasTrak
filter. This filter must be checked and replaced every 300 hours
4-6
oil
levels
with
quality
®
SD mowers will have a carbon canister
Figure 4-8
®
SD mowers have a fuel evaporation system
and
viscosity
Fuel evaporation
system filter
602901
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