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4-9
NOTE: Models 927053 & 927061 are equipped with a
fuel shutoff valve located on the right fuel tank mount (Fig.
4-9b). Rotate the valve to the forward position to prevent
fuel flow to the fuel pump. The middle position (shown)
allows fuel to flow from the right fuel tank to the fuel pump.
The rear position allows fuel to flow from the left fuel tank
to the fuel pump.
Engine oil and filter
Check engine oil daily and after every 4 hours of
operation. Crankcase dipstick and oil filler tube are located
at the rear of the machine (Fig. 4-10). Tractor must be
setting level when checking oil. Refer to engine manual and
maintenance schedule for oil recommendation and
capacities.
Change the engine oil and filter after the first 5 hours of
operation, per the engine manufacturer’s recommendations
after that. If tractor is being operated in extremely dirty
conditions, then it is recommended oil be changed more
frequently.
The oil drain and oil filter are located at the rear of the
engine. Fig. 4-10
Engine air filter
Perform engine air filter maintenance per the Service
Interval chart on page 4-2.
A specially designed dry filter is standard equipment on
the Hustler Z and Super Z tractors and supplies clean
combustion air to the engine. Fig. 4-11
Safety filter
The Super Z liquid cool tractor is equipped with a safety
filter. The filter element slides over the safety filter. Use
Hustler part number 785279 only when replacing the safety
filter.
NOTE: The safety filter does not require servicing unless
it becomes contaminated with dirt or moisture.
Recommended service procedure
Many engine failures can be attributed to improper air
cleaner servicing. Ingested dust and dirt will cause cylinder,
piston and bearing damage in a few hours. “Dusted”
engines will result from:
1. Overservicing the air filter element.
2. Improper installation.
3. Damaged filter, seals or canister.
4. Incorrect air filter element size.
5. Use of poorly designed aftermarket air filter elements.
Air cleaner servicing is an inexpensive maintenance
check that can prevent costly non-warrantable premature
engine damage.
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 element, 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 Donaldson
warranty for air filters expires upon cleaning or
servicing in any manner because the condition of the
filter after servicing is completely out of their 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.
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
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