DeWalt DW168F - Maintenance CHART; CLEANING AIR Fliter Element; Oil

14

MaIntenanCe
Procedure Daily 50 hours
or weekly
(whichever
comes first)
100 hours 150 hours
or monthly
(whichever
comes first)
500 Hours
Clean engine exterior X
Cleanbatterypackand
charger
X
Checkoillevel X
Change oil * X(1)
Clean air filter X(1)
Cleansparkplugs
X
Checkfuelline,hoseclamps
andfueltank
X
Oilleakinspection X
Sparkarrestor
X
Sediment cup
X
Clean inline fuel filter
X
Checkforunusual
noise/vibration
X
Checkandadjustvalve
clearance(.15mmintake,
.2mmexhaust)
X
Prepare unit for Storage
Prepare unit for storage if it is to remain idle for more then 30
days
* The engine oil must be changed after the first 20 hours or operation. Thereafter change oil every
100 hours of operation or monthly, whichever comes first.
(1)Performmorefrequentlyindustyorhumidconditions
SPARK PLUG CONDITION CHECK
 • Removethesparkplugforinspection
 • AlwaysuserecommendedplugseeSpecifications
 • Setgaptospecification,seeSpark Plug under Maintenance Standards.
1. Normal Plug – Slightly rounded electrodes with light coat of ashy brown deposits indi-
cate normal wear and a healthy engine.
2. Oil Fouling –Wetoilyfilmwillpreventtheplugfromsparking.Thisconditionsignals
worn valves or piston rings. This condition can be caused by running the engine in
thechokeposition.Checkvalvesandpistonrings,overhaulifneeded.Replacespark
plug.
3. Carbon Fouling–Blackdrysootcoveringtheelectrodesindicatesincompletecom-
bustion.Thiscanbearesultofweakignitionorarichmixture.
  a.Checkcarburetoradjustment,adjustspeedifneeded.
  b.Checkairfilter,cleanifneeded.
4. Gap Bridging – A combustion particle lodged between the electrodes carries current
across the gap. This does not normally signal engine problems elsewhere.
5. Whitened Electrodes – This is evidence combustion is too hot and there is overheat-
ing. This can result from too lean fuel mixture.
  a.Make sure spark plug is correct type, see Spark Plug under Maintenance
Standards.
b. Ignition timing malfunction. Set ignition air coil gap, see the Flywheel Ignition
Adjustment section.
6. Excessive Wear – Plug worn to the point of having encrusted deposits and thin
rounded out electrodes. Replace plug.

WARNING: Hot surfaces. Risk of burn. Engine and surrounding parts are very hot, do not
touch. Allow engine to cool prior to servicing.
A dirty air cleaner will restrict airflow to the carburetor. To prevent carburetor mal func tion,
service the air filter regularly. Service more frequently when operating the generator in
extremely dusty areas.
WARNING: Using gasoline or flam mable solvent to clean the filter element can cause a
fire or explosion.
WARNING: Risk of fire. Do not operate without air filter.
TO CLEAN THE ELEMENTS
(DW168F-2E, DW177F-E, DW168F-2H, DW177F-H)
1. Remove the wing nut and the air filter cover.
2. Remove the second wing nut and remove the filter.
3. Remove the foam-type pre-filter from the filter.
4. Inspect foam and paper elements. Replace them if damaged.
TO CLEAN THE ELEMENTS
Foam element: Wash element in warm, soapy
water. Then saturate it in clean engine oil.
Squeezetheelementtoremoveexcessoil.
Paper element: Clean element by tapping
gently to remove dust. Use compressed air to
blow off dust.
WARNING: When using compressed air, user
always must wear eye protection that conforms to
ANSI Z87.1. (CAN/CSA Z94.3).
Never use oil. Always blow the element from the
inside.Ifusingcompressedairkeeptheairpressurelessthan30psi.
Place the foam pre-filter over the paper element and reinstall it onto the engine.
(DW168F-2F, DW177FD-F, DW188F)
1. Unsnap the air filter cover clips and remove
the air cleaner cover.
2. Remove the elements from air filter.
3. Wash elements in warm soapy water and
rinse thoroughly. Allow the elements to dry
thoroughly.
 4.Soak the elements in clean engine oil and
squeezeouttheexcessoil.NOTE: Theenginewillsmokeduringinitialstart-upiftoo
much oil is left in the elements.
5. Reinstall the air filter elements and snap air filter cover in place.

WARNING: Hot surfaces. Risk of burn. Engine and surrounding parts are very hot, do
not touch. Allow engine to cool prior to servicing.
TO CHECK OIL
1. Place unit on a flat level surface.