BigDog BigDog Mowers X Diablo, Operator'S Manual

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dust. Locate and repair the source of ingested dirt.
6. Never operate a 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 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 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.
General engine maintenance
IMPORTANT: 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 servic-
ing, lubricating oil levels with quality and viscosity recommen-
dations, 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.
Fuel evaporation system filter
All BigDog ® X Diablo mowers have a fuel evaporation
system filter. This filter must be checked and replaced every 500
hours or annually whichever comes first. Figure 4-8
Belts
Inspect belts frequently for wear and serviceability. Replace a
belt that shows signs of severe cuts, tears, separation, weather
checking and cracking, or burns caused by slipping. Slight
raveling of belt covering does not indicate failure, trim ravelings
with a sharp knife.
Inspect the belt pulley grooves and flanges for wear. A new
belt, or one in good condition, should never run against the
bottom of the groove. Replace the pulley when this is the case,
otherwise belt will lose power and slip excessively.
Figure 4-7
Safety filter
Figure 4-8
WARNING
If the pump belt fails, loss of control will occur especially
when operating on a slope.
If you lose steering control
while operating the machine, place the steering con-
trol levers in the park brake position immediately.
Inspect the machine and involve your BigDog
® Mow-
ers dealer to resolve the problem before continuing to
operate.
Fuel evaporation
system filter