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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.
Improper installation of an air filter element
Dust must not leak past the seals on each end of the air filter element. The filter must be aligned within the
canister and properly seated for an effective seal so that no dirt can enter the engine.
Damaged filter, seals or canister
Never bang or bump the filter element against the tire or any solid object, as dust and dirt particles will be
forced through the media causing continual passing of dirt into the engine. Visually inspect the outside of
the air cleaner canister periodically for external damage and replace if necessary.
Incorrect air cleaner element
Use only the correct Donaldson air filter element, Hustler part number 785261, which is designed to fit the
canister properly.
Hustler air filter elements have the correct media composition, filter area, micron size and dimensions.
Always use genuine Hustler filters. Many aftermarket filters have been found to be incompatible with
Hustler's canisters and engines.
The air filter must remain intact to block passage of dirt and foreign particles from entering the engine.
Being inclined to disbelieve the need for more expensive air filter elements used on gasoline engines may
cause some individuals to opt for a less expensive part.
The filter element must be sufficient size and construction to withstand stresses, caused by rapid cycling of
the air volume demanded by the engine, without cracking or tearing under fatigue and pressure (especially
diesel engines). Therefore, Hustler Turf Equipment and the engine manufacturers have carefully selected
a reliable filter designed to fit the needs of the engines. The filter specified is a Donaldson filter, Hustler
part number 785261.
Owners should be reminded that failure to use original equipment replacement parts is an "alteration" and
will not be considered for warranty in the event of engine damage.
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 rotate 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 cup. Make sure it seals all the way around the air cleaner body, then tighten the clamps.
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 a machine without an air filter installed.
Air restriction indicator
Any unit with a Kohler or Kawasaki engine will have an air restriction indicator installed in the air cleaner
"FIG. 40".
Replace the element whenever the restriction indicator shows 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 "FIG. 40"
10-29
108602 10/08
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