WilTec 61493 User manual

Operation Manual
ARTICEL 61493
Read and follow the operating instructions and safety information before using for the first time.
Technical changes reserved!
Due to further developments, illustrations, functioning steps and technical data can differ
insignificantly.
Updating the documentation
If you have suggestions for improvement or have found any irregularities please contact us.
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The information contained in this document is subject to change without prior notice. o part of this
document can be copied or duplicated in another form without the prior written consent of WilTec
Wildanger Technik GmbH. The WilTec Wildanger Technik GmbH assumes no liability for any errors in
this user manual or the connection diagram.
Although WilTec Wildanger Technik GmbH has made every effort to make sure that this user manual
is complete, accurate and updated, errors cannot always be avoided. In the event of problems with
this user manual please complete and send this form back to us.
FAX-notification (+++49 2403 55592-15),
from: ________________________________________
Name: ________________
Firm:_____________________
Tel/Fax:__________________
I would like to report the followin mistakes:
_______________________________ ____________________________________
Customer Service WilTec Wildanger Technik GmbH
e-mail: [email protected]
Tel:++ [phone]
Introduction
Thank you for purchasing this quality product. To minimize the risk of injury by means of fire or
electric shock we ur e that our clients take some basic safety precautions when usin this
device. Please read the operation instructions carefully and make sure you have understood its
content.
Always use a grounded power connection with the appropriate mains voltage. You can find the
corresponding mains voltage on the type plate. If you have any doubts about the connection being
grounded, have it checked by a qualified professional. ever use a faulty electric cable.
Do not inspect the electrical part of the pressure pond filter in a wet or damp environment or when you
are wet yourself and protect it from direct sunlight. Install this device in a safe location so that nobody
can step on the cable, fall over or damage it. Disconnect the power plug before cleaning it and use
only a damp cloth for cleaning. Avoid using cleaning agents and make sure that no liquid enters the
electrical part of the pump.
The electric part of the device contains no parts that can be inspected or serviced by the user. Leave
the maintenance, adjustment and repair to qualified technical personnel. In case of unauthorised
intervention the 2-year warranty is no longer valid! Keep these operation instructions safe.
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SAFETY FIRST
Instructions contained in warnings within this manual marked with a symbol con-
cern critical points which must be taken into consideration to prevent possible serious
bodily injury, and for this reason you are requested to read all such instructions care-
fully and follow them without fail.
WARNINGS IN THE MANUAL:
WARNING
This mark indicates instructions which must be followed in order to prevent accidents
which could lead to serious bodily injury or death.
IMPORTANT
This mark indicates instructions which must be followed, or it leads to mechanical fail-
ure, breakdown, or damage.
NOTE
This mark indicates hints or directions useful in the use of the product.
Content of this Operator’s Manual
1. Parts location
2. Specifications
3. Warnin labels on the machine
4. Symbols on the machine
5. For safe operation
6. Fuel
7. Operation
8. Maintenance
9. Stora e
10. Disposal
11. Troubleshootin
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1. Parts location
1. Fuel tank
2. Starter
3. Throttle lever
4. Ignition switch
5. Throttle Cable
6. Muffler
7. Blade
8. Front handle
9. Rear handle
2. Specifications
Model TMHT230B/TMHT260B/TMHT230B-2/TMHT260B-2
Type Reciprocating double-sided dual blades
Dry weight 6.5(kg)
Blade size 550(mm) /620mm
Blade pitch 28(mm)
Transmission Centrifugal clutch, Cam-crank
En ine
Type Air-cooled 2-stroke gasoline
Model 1E32F/1E34F
Displacement 22.5 (cm3) /25.4 (cm3)
Max. Output (0.9kW) at 7500/min-1 (rpm)
Idle speed 2800±200/min-1 (rpm)
Fuel mixture (Gasoline 25 : Oil 1)
Fuel tank capacity 0.58(liter)
Sound pressure level Measurement: 97, 7dB (A) K = 3 dB (A)
Sound power level measurement 107, 7dB (A ) K = 3 dB (A)
Sound power level Lwa 110dB (A)
Vibrations front handle 6.984m/s2
Vibrations rear handle 8.293 m/s2 K = 1.5 m/s2
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3. Warnin labels on the machine
(1) Read owner's manual before operating this machine.
(2) Wear head, eye and ear protection.
(3) Handling this machine improperly could result in accidents causing serious injury
or death. Read this manual carefully and practice using the hedge trimmer until you
are fully acquainted with all operations and have learned to use it correctly.
(4) This is extremely sharp and can easily cause cuts.
IMPORTANT
If warning labels peel off or become soiled and impossible to read, you should contact the dealer from
which you purchased the product to order new labels and affix them in the required location(s).
WARNING
ever modify your hedge trimmer. We won’t warrant the machine, if you use the remodeled hedge
trimmer or you don’t observe the proper usage written in the manual.
4. Symbols on the machine
For safe operation and maintenance, symbols are carved in relief on the machine. Accord-
ing to these indications, please be careful not to take a mistake.
(a) The port to refuel the "MIX GASOLI E"
Position: FUEL TA K CAP
(b) The direction to close the choke
Position: AIR CLEA ER COVER
(c) The direction to open the choke
Position: AIR CLEA ER COVER
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5. For safe operation
1. THIS MACHINE CAN CAUSE SERIOUS INJURIES. Read this manual carefully
until you completely understand and follow all safety and operating instructions.
Also, know how to stop the machine quickly in an emergency.
2. Keep this manual handy so that you may refer to it later whenever any questions
arise. Also note, if you have any questions which cannot be answered herein, con-
tact the dealer from whom you purchased the product.
3. Always be sure to include this manual when selling, lending, or otherwise transfer-
ring the ownership of this product.
4. ever allow children or anyone unable to fully understand the directions given in
the manual to use the machine.
WORKING CONDITION
1. When using the product, you should wear proper clothing and protective equip-
ment.
(1) Helmet
(2) Ear protectors
(3) Protection goggles or face protector
(4) Thick work gloves
(5) on-slip-sole work boots
2. And you should carry with you.
(1) Attached tools
(2) Properly reserved fuel
(3) Spare blade
(4) Things to notify your working area (rope, warning signs)
(5) Whistle (for collaboration or emergency)
(6) Hatchet or saw (for removal of obstacles)
(7) First-aid kit
3. Do not wear loose clothing, jewelry, short trousers, sandals, or go barefoot. Do
not wear anything which might be caught by a moving part of the unit. Secure hair
so it is above shoulder length.
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WORKING CIRCUMSTANCE
2. ever start the engine inside a closed room or building. Exhaust gases contain
dangerous carbon monoxide.
2. ever use the product, a. when the ground is slippery or when you can’t maintain a
steady posture.
b. At night, at times of heavy fog, or at any other times when your field of vision might
be limited and it would be difficult to gain a clear view of the working area.
c. During rain storms, during lightning storms, at times of strong or gale-force winds, or
at any other times when weather conditions might make it unsafe to use the product.
WORKING PLAN
You should never use the product when under the influence of alcohol or drugs, when
suffering from exhaustion or lack of sleep, when suffering from drowsiness as a result
of having taken cold medicine or at any other time when a possibility exists that your
judgment might be impaired or that you might not be able to operate the product prop-
erly and in a safe manner.
When planning your work schedule, allow plenty of time to rest. Limit the amount of
time over which the product is to be used continuously to somewhere around 30 ~ 40
minutes per session, and take 10 ~ 20 minutes of rest between work sessions. Also try
to keep the total amount of work performed in a single day under 2 hours or less.
WAR I G
1. If you don’t observe the working time, or working manner (See “USI G THE PROD-
UCT”), Repetitive Stress Injury (RSI) could occur. If you feel discomfort, redness and
swelling of your fingers or any other part of your body, see a doctor before getting
worse.
2. To avoid noise complaints, in general, operate product between 8 a.m. and 5 p.m.
on weekdays and 9 a.m. to 5 p.m. on weekends.
OTE
Check and follow the local regulations as to sound level and hours of operations for the
product.
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BEFORE STARTING THE ENGINE
1. The area within a perimeter of 15 m (50 ft) of the person using the product should be considered a
hazardous area into which no one should enter. If necessary, yellow warning rope, warning signs
should be placed around the perimeter of the area. When work is to be performed care should also be
taken to constantly look around or otherwise check for the presence and locations of other people
working so as to maintain a distance between each person sufficient to ensure safety.
2. Check the condition of working area to avoid any accident by hitting hidden obstacles such as
stumps, stones, cans, or broken glass.
IMPORTA T
Remove any obstacle before beginning work.
3. Inspect the entire unit for loose fasteners and fuel leakage. Make sure that the cutting attachment is
properly installed and securely fastened.
STARTING THE ENGINE
1. Keep bystanders, especially children, and animals at least 15 m (50 ft) away from the operating
point. If you are approached, immediately stop the engine.
2. The product is equipped with a centrifugal clutch mechanism, so the cutting attachment might begin
to rotate as soon as the engine is started. When starting the engine, place the product onto the ground
in a flat clear area and hold it firmly in place so as to ensure that neither the cutting part nor the throttle
come into contact with any obstacle when the engine starts.
WAR I G: ever place the throttle into the high-speed position when starting the engine. ever start
the engine at the cutting attachment side.
3. After starting the engine, check to make sure that the cutting attachment stops rotating when the
throttle is moved fully back to its original position. If it continues to rotate even after the throttle has
been moved fully back, turn off the engine and take the unit to your authorized servicing dealer for re-
pair.
USING THE PRODUCT
IMPORTA T: Cut only materials recommended by the manufacturer. And use only for tasks explained
in the manual.
1. Grip the handles firmly with both hands using your whole hand. Place your feet slightly apart
(slightly further apart than the width of your shoulders) so that your weight is distributed evenly across
both legs, and always be sure to maintain a steady, even posture while working.
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2. Maintain the speed of the engine at the level required to perform cutting work, and never raise the
speed of the engine above the level necessary.
3. If the unit starts to shake or vibrate, turn off the engine and check the whole unit. Do not use it until
the trouble has been properly corrected.
4. Keep all parts of your body away from rotating cutting attachment and hot sur-
faces.
5. ever touch the muffler, spark plug, or other metallic parts of the engine while
the engine is in operation or immediately after shutting down the engine. Doing so
could result in serious burns or electrical shock.
6. While operating the machine be always sure of a safe and secure operating po-
sition especially when using steps or a ladder.
IF SOMEONE COMES:
1. Guard against hazardous situations at all times. Warn adults to keep pets and
children away from the area. Be careful if you are approached. Injury may result from
flying debris.
2. If someone calls out or otherwise interrupts you while working, always be sure to
turn off the engine before turning around.
MAINTENANCE
1. In order to maintain your product in proper working order, perform the maintenance and checking
operations described in the manual at regular intervals.
2. Always be sure to turn off the engine before performing any maintenance, checking procedures or
working on the machine.
(1) Check if everything is alright!
WARNING: The metallic parts reach hi h temperatures immediately after stoppin the en ine.
3. When replacing the cutting attachment or any other part, or when replacing the oil or any lubricant,
always be sure to use only products which have been certified for use with the product.
4. In the event that any part must be replaced or any maintenance or repair work not described in this
manual must be performed, please contact a representative from the store nearest authorized servic-
ing dealer for assistance.
5. Do not use any accessory or attachment other than those bearing the mark and recommended for
the unit.
6. Under no circumstances should you ever take apart the product or alter it in any way. Doing so
might result in the product becoming damaged during operation or the product becoming unable to op-
erate properly.
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HANDLING FUEL
1. The engine of the product is designed to run on a mixed fuel, which contains
highly flammable gasoline. ever store cans of fuel or refill the tank of the unit in any
place where there is a boiler, stove, wood fire, electrical sparks, welding sparks, or
any other source of heat or fire which might ignite the fuel.
2. ever smoke while operating the unit or refilling its fuel tank.
3. When refilling the tank, always turn off the engine and allow it to cool down. Take
a careful look around to make sure that there are no sparks or open flames any-
where nearby before refueling.
(1) Refill after cooling the engine.
4. Wipe spilled fuel completely using a dry rag if any fuel spillage occurs during refu-
eling.
5. After refueling, screw the fuel cap back tightly onto the fuel tank and then carry the unit to a spot 3
m or more away from where it was refueled before turning on the engine.
6. Do not inhale fuel fumes as they are toxic.
TRANSPORTATION
1. When hand-carrying the product, covers over the cutting part if necessary, lift up the product and
carry it paying attention to the blade.
2. ever transport the product over rough roads over long distances by vehicle without removing all
fuel from the fuel tank. If doing so, fuel might leak from the tank during transport.
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6. Fuel
FUEL
WAR I G
Gasoline is very flammable. Avoid smoking or bringing any flame or sparks
near fuel. Make sure to stop the engine and allow it cool before refueling the
unit. Select outdoor bare ground for fueling and move at least 10 ft (3 m) away
from the fueling point before starting the engine.
GASOLINE REQUIREMENTS
All 2-Stroke Products are powered by Professional-Commercial Duty, Hi-Performance, Hi-RPM, Air
Cooled 2-Stroke engines.
Hi-Performance 2-stroke engines produce higher HP outputs as compared to standard Home Owner
Duty or Light Commercial Duty production engines offered by most manufacturers. Exhaust emission
are controlled by the fundamental engine parameters and components (eq., carburetion, ignition timing
and port timing) without addition of any major hardware or the introduction of an inert material during
combustion.
Gasoline/Oil mixture Stora e Recommendations:
Store your gasoline or gasoline/oil mixture in a cool dry area in a tightly sealed approved container to
limit the entry of moisture and additional air (oxygen). Moisture and air cause the development of var-
nish and gum, making the fuel stale. Stored gasoline and gasoline/oil mixture ages and loses its oc-
tane rating and volatility. Do not mix more gasoline/oil than you intend to use in 30 days, and 60 days
when fuel stabilizer is added.
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HOW TO MIX FUEL
RECOMMENDED MIXING RATIO GASOLINE/OIL 25:1:
Gasoline Liter: 0.5 1.0 1.5 2.0 2.5
2-Stroke Oil ml: 20 40 60 80 100
Pay attention to agitation.
1. Measure out the quantities of gasoline and oil to be mixed.
2. Put some of the gasoline into a clean, approved fuel container.
3. Pour in all of the oil and agitate well for 10seconds.
4. Pour in the rest of gasoline and agitate again for at least one minute. As some oils may be difficult
to agitate depending on oil ingredients, sufficient agitation is necessary. Be careful that, if the agitation
is insufficient, there is an increased danger of early piston seizure due to abnormally lean mixture.
5. Place a clear indication on the outside of the container to avoid mixing up with gasoline or other
containers that do not contain oil.
6. Indicate the contents on outside of container for easy identification.
FUELING THE UNIT
1. Untwist and remove the fuel cap. Rest the cap on a clean surface.
2. Put fuel into the fuel tank to 80% of the full capacity.
3. Fasten the fuel cap securely and wipe up any fuel spillage around the unit.
WARNING
1. Select flat and bare ground for fueling.
2. Move at least 10 feet (3 meters) away from the fueling point before starting the engine.
3. Stop the engine before refueling the unit. At that time, be sure to sufficiently agitate the mixed gaso -
line in the container.
FOR YOUR ENGINE LIFE, AVOID:
1. FUEL WITH O OIL (RAW GASOLI E). It will cause severe damage to the internal engine parts
very quickly.
2. GASOHOL – It can cause deterioration of rubber and/or plastic parts and disruption of engine lubri-
cation.
3. OIL FOR 4-STROKE E GI E USE – It can cause spark plug fouling, exhaust port blocking, or pis -
ton ring seizure.
4. Mixed fuels which have been left unused for a period of one month or more may clog the carburetor
and result in the engine failing to operate properly.
5. In the case of storing the product for a long period of time, clean the fuel tank after rendering it
empty. ext, start the engine and run the carburetor dry of residual fuel.
6. In the case of scrapping the used mixed oil container, scrap it only at an authorized depository site.
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OTE
As for details of quality assurance, read the description in the section Limited Warranty carefully.
Moreover, normal wear and change in product with no functional influence are not covered by the war-
ranty. Also, be careful that, if the usage in the instruction manual is not observed as to the mixed gaso-
line, type of oil or fuel to be used described therein, it may not be covered by the warranty.
7. Operation
STARTING ENGINE
WARNING
Keep the blades clear of the surroundin as they will start movin upon startin of the en ine.
1. When first starting up after putting fuel into the machine, push the priming pump
until fuel runs out in the clear tube. Then close the choke. Choking may not be
necessary when re-starting right after stopping the engine. (OP1)
(1) Primer pump (2) Choke lever (3) CLOSE (4) OPE
2. Pull the throttle lever and push the lock button to set the lever in the START po-
sition. (OP2)
(1) Throttle lever (2) Lock button
3. Slide the ignition switch to the engine side to set it in the O position. (OP3)
4. Rest the unit on a firm place. Pull the starter knob quickly. (OP4)
OTE
• Avoid pulling the rope to its end or returning it by releasing the knob. Such ac-
tions can cause starter failures.
5. When the engine has started, gradually open the choke.
6. Allow the engine to warm up for a half minute before starting operation.
OTE
• If the engine won't start after several attempts, open the choke and repeat pulling the rope or remove
the spark plug and dry it.
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STOPPING ENGINE
1. Release the throttle lever and run the engine at idling speed for a half minute.
2. Slide the ignition switch to the STOP Position.
IMPORTA T
Except for an emergency, avoid stopping the engine while pulling the throttle lever.
OTE
If the engine won't stop when setting the ignition switch to the stop position, close the choke lever and
stop the engine. In this case, please repair the machine, at your nearest servicing dealer.
ADJUSTING IDLING SPEED
1. When the engine tends to stop frequently at idling mode, turn the idle set
screw clockwise.
OTE
1. Idle set screw
2. When the cutting blades keep moving after releasing the throttle trigger, turn the idle set screw
counter-clockwise. Warm up the engine before adjusting the idling speed.
HOW TO USE
The blades spacing is 28mm. Cutting too thick twigs or metal wires can not only break the blade teeth
but also give damage to the drive mechanism. When trimming leaves and thin twigs, guide the blades
as drawing a half circle on the surface, and you will get a better finish.
Running the engine at high speed with the blades Jammed up can shorten the life of clutch parts.
When the blades have been jammed by thick twigs, stop operation at once and draw your unit off the
objects after stopping the engine. When clipping comparatively thick twigs, move your unit slowly back
and forth like a saw, and they can be cut to a fine finish.
OTE
When a new unit is first operated, in the first few minutes grease may come out of the gear case. But,
since this is excess grease, there is no cause for alarm. For next use just wipe it off with the engine
stopped.
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HEDGE TRIMMING TECHNIQUES
Trim sides of a hedge first and then top.
Vertical cut:
With the 2-sided blade model CHT2250 use an arcing cut from the bottom up-
wards, then downwards to use both sides of the blades (OP7).
Horizontal cut:
In order to get the best cutting results, slightly tilt the blade (5°–10°) towards the
cutting direction (OP8). Cut slowly, especially with thick hedges.
WAR I G
Always follow the safety precautions. The hedge-trimmer must only be used to trim hedges or small
bushes. It is forbidden to cut other types of material. Do not use the hedge-trimmer as a lever to lift,
move or break objects, nor lock it on fixed supports. It is forbidden to apply tools or applications that
are not the ones indicated by the manufacturer onto the hedge-trimmer’s power take-off. Do not use it
for pruning trees or cutting grass.
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8. Maintenance
MAI TE A CE CHART
System/components Procedure Before
use
Every
25
Hours
after
Every
50
Hours
after
Eve-
ry100
Hours
after
Note
E
G
I
E
fuel leaks, fuel sp llage w pe out
fuel tank, a r f lter, fuel f lter nspect/clean replace, f necessary
dle adjust ng screw see adjust ng
dl ng speed
replace carburetor
f necessary
spark plug clean and readjust
plug gap
GAP : 0.65 mm
replace, f necessary
cyl nder f ns, ntake a r cool ng vent clean
muffler, spark arrester, cyl nder exhaust port clean
T
R
I
M
M
E
R
throttle lever, gn t on sw tch check operat on
cutt ng parts replace f
someth ng’s wrong
gear case grease
screws/nuts/bolts t ghten/replace not adjust ng screws
debr s guard make sure to attach
WAR I G
Make sure that the engine has stopped and is cool before performing any service to the machine.
Contact with moving cutting head or hot muffler may result in a personal injury.
AIR FILTER
The air filter, if clogged, will reduce the engine performance. Check and clean the filter ele-
ment in warm, soapy water as required. Dry completely before installing. If the element is
broken or shrunk, replace with a new one. (MA1) Air filter
FUEL FILTER
When the engine runs short of fuel supply, check the fuel cap and the fuel filter for block-
age. (MA2) Fuel filter
SPARK PLUG
Starting failure and misfiring are often caused by a fouled spark plug. Clean the spark plug
and check that the plug gap is in the correct range. For a replacement plug, use the correct
type. REPLACEME T PLUG IS LD L8RTF
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IMPORTA T
ote that using any spark plug other than those designated may result in the engine failing to operate
properly or in the engine becoming overheated and damaged.
To install the spark plug, first turn the plug until it is finger tight, then tighten it a quarter turn more with
a socket wrench. [TIGHTE I G TORQUE: 87~121 in-lbs (9.8~13.7 .m.)]
WAR I G
Inspect periodically, the muffler for loose fasteners, any damage or corrosion. If any sign of exhaust
leakage is found, stop using the machine and have it repaired immediately. ote that failing to do so
may result in the engine catching on fire.
SPARK ARRESTER (MA4)
The muffler is equipped with a spark arrester to prevent red hot carbon from
flying out of the exhaust outlet. Periodically inspect and clean as necessary
with a wire brush. In the State of California it is required by law (Section 4442
of the California Public Resources Code) to equip a spark arrester when a gas
powered tool is used in any forest covered, brush covered, or grass covered
unimproved land.
(1) Spark arrester
INTAKE AIR COOLING VENT
WAR I G
ever touch the cylinder, muffler, or spark plugs with your bare hands immedi-
ately after stopping the engine. The engine can become very hot when in oper-
ation, and doing so could result in severe burns. Clean the cylinder fins with
compressed air or a brush. (MA5)
(1) Cylinder
(2) Intake air cooling vent (back)
IMPORTA T
If waste gets stuck and causes blockage around the intake air cooling vent or between the cylinder
fins, it may cause the engine to overheat, and that in turn may cause mechanical failure on the part of
the hedge-trimmer.
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BLADES
Oil blades each gas tank filling. (MA6)
WAR I G
Make sure that the blade bolts are well tightened. The blade assembly is de-
signed to automatically compensate for any play between the blades.
Sharpening (MA7):
Always keep the file or sharpener at an angle of 45° to the blade, and: Always
grind in the direction of the cutting edge.
ote: files cut only in one direction. Lift the file from the blade when returning to
start a new pass. Remove every burr from the edge of the blade with a slip stone.
Remove as little material as possible. Before refitting the sharpened blades, remove filings and then
apply grease. Do not try to sharpen a damaged blade: change it or take it to a Service dealer.
REDUCTION GEARBOX
Refill gear housing every 25 working hours. Use grease pump. Feed grease until
it comes out of the base of blades. (MA8)
PROCEDURES TO BE PERFORMED AFTER EVERY 100 HOURS OF USE
1. Remove the muffler, insert a screwdriver into the vent, and wipe away any car-
bon buildup. Wipe away any carbon buildup on the muffler exhaust vent and cylin-
der exhaust port at the same time.
2. Tighten all screws, bolts, and fittings.
3. Check to see if any oil or grease has worked its way in between the clutch lin -
ing and drum, and if so wipe it clean.
9. Stora e
1. Oil the blade to prevent rust.
2. Empty the fuel tank and put the cap back on.
3. Remove the spark plug and pour a small amount of oil into the cylinder.
4. Rotate the crankshaft several times using the starting rope in order to distribute the oil. Put the
spark plug back in.
5. Wrap the engine with a plastic sheet.
6. Store the trimmer in a dry place, preferably not in direct contact with the floor and away from heat
sources.
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10. Disposal
When disposing your machine, fuel or oil for the machine, be sure to allow your local regulations.
11. Troubleshootin
Case 1: Starting failure
CHECK PROBABLE CAUSES ACTIO
fuel tank incorrect fuel drain it and fill in correct fuel
fuel filter fuel filter is clogged clean
carburetor adjustment screw out of normal range adjust to normal range
sparking (no spark) spark plug is fouled/wet clean/dry
sparking (no spark) plug gap is incorrect correct (Gap: 0.65 mm)
spark plug disconnected retighten
Case 2: Engine starts but does not keep running/re-starting is very hard.
CHECK PROBABLE CAUSES ACTIO
fuel tank incorrect fuel or staled fuel drain it and fill in correct fuel
carburetor adjustment screw out of normal range adjust to normal range
muffler, cylinder (exhaust port) carbon is built-up wipe away
air cleaner clogged with dust wash
cylinder fin, fan cover clogged with dust clean
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