Craftsman 247.77638 User manual
Sears, Roebuck and Co., Hoffman Estates, IL 60179, U.S.A.
Visit our web site: www.craftsman.com
CAUTION: Before using
this product, read this
manual and follow all
safety rules and operating
instructions.
Operator’s Manual
1450 Series Engine
Chipper Shredder
Model No. 247.77638
• SAFETY
• ASSEMBLY
• OPERATION
• MAINTENANCE
• PARTS LIST
• ESPAÑOL
5/4/2009
FORM NO. 769-05040
®
For questions, call
1-800-4-MY-HOME
2
TABLE OF CONTENTS
WARRANTY
PRODUCT SPECIFICATIONS MODEL NUMBER
Warranty Statement..................................Page 2
Safe Operation Practices.......................... Pages 3-6
Safety Labels............................................ Page 7
Assembly ..................................................Pages 8-11
Operation..................................................Pages 12-13
Service and Maintenance.........................Pages 14-17
Off-Season Storage..................................Page 18
Trouble Shooting....................................... Page 19
Parts List...................................................Page 20-30
Label Map.................................................Page 31
Repair Protection Agreement ...................Page 34
Español .....................................................Page 35
Service Numbers...................................... Back Cover
Engine Series: 1450
Engine Oil Type: SAE 30
Engine Oil Capacity: 28 ounces
Fuel: Unleaded Gasoline
Spark Plug: Champion® RC-12YC
Spark Plug Gap: .030”
Model Number.................................................................
Serial Number .................................................................
Date of Purchase .............................................................
Record the model number, serial number
and date of purchase above
© Sears Brands, LLC
CRAFTSMAN FULL WARRANTY
When operated and maintained according to all supplied instructions, if this chipper shredder fails due to a defect in material or workmanship
within two years from the date of purchase, return it to any Sears store, Sears Parts & Repair Service Center, or other Craftsman outlet in the
United States for free repair (or replacement if repair proves impossible).
This warranty applies for only 90 days from the date of purchase if this chipper shredder is ever used for commercial or rental purposes.
This warranty covers ONLY defects in material and workmanship. Sears will NOT pay for:
• Expendableitemsthatbecomewornduringnormaluse,includingbutnotlimitedtoblades,sparkplug,aircleaner,flailscreenandcatcher
bag.
• Standardmaintenanceservicing,oilchanges,ortune-ups.
• Tirereplacementorrepaircausedbypuncturesfromoutsideobjects,suchasnails,thorns,stumps,orglass.
• Tireorwheelreplacementorrepairresultingfromnormalwear,accident,orimproperoperationormaintenance.
• Repairsnecessarybecauseofoperatorabuse,includingbutnotlimitedtodamagecausedbyimpactingobjectsthatbendtheframeor
crankshaft, or over-speeding the engine.
• Repairsnecessarybecauseofoperatornegligence,includingbutnotlimitedto,electricalandmechanicaldamagecausedbyimproper
storage, failure to use the proper grade and amount of engine oil, or failure to maintain the equipment according to the instructions
contained in the operator’s manual.
• Engine(fuelsystem)cleaningorrepairscausedbyfueldeterminedtobecontaminatedoroxidized(stale).Ingeneral,fuelshouldbeused
within 30 days of its purchase date.
• Normaldeteriorationandwearoftheexteriorfinishes,orproductlabelreplacement.
This warranty applies only while this product is within the United States.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Sears,RoebuckandCo.,HoffmanEstates,IL60179
3
SAFETY INSTRUCTIONS
TRAINING
Read, understand, and follow all instructions on the machine and•
in the manual(s) before attempting to assemble and operate.
Keep this manual in a safe place for future and regular reference
and for ordering replacement parts.
Read the Operator’s Manual and follow all warnings and safety•
instructions.Failuretodosocanresultinseriousinjurytothe
operator and/or bystanders. For questions, call 1-800-659-5917.
Be familiar with all controls and their proper operation. Know how•
to stop the machine and disengage them quickly.
Never allow children under 16 years of age to operate this•
machine. Children 16 and over should read and understand the
instructions and safe operation practices in this manual and on
the machine and be trained and supervised by an adult.
Never allow adults to operate this machine without proper•
instruction.
Keep bystanders, pets, and children at least 75 feet from the•
machine while it is in operation. Stop machine if anyone enters
the area.
Never run an engine indoors or in a poorly ventilated area. Engine•
exhaustcontainscarbonmonoxide,anodorlessanddeadlygas.
Do not put hands and feet near rotating parts or in the feeding•
chambers and discharge opening. Contact with the rotating
impeller can amputate fingers, hands, and feet.
Never attempt to unclog either the feed intake or discharge•
opening, remove or empty bag, or inspect and repair the machine
while the engine is running. Shut the engine off and wait until all
moving parts have come to a complete stop. Disconnect the spark
plug wire and ground it against the engine.
PREPARATION
Thoroughly inspect the area where the equipment is to be used.•
Removeallrocks,bottles,cans,orotherforeignobjectswhich
couldbepickeduporthrownandcausepersonalinjuryor
damage to the machine.
Always wear safety glasses or safety goggles during operation•
andwhileperforminganadjustmentorrepair,toprotectyour
eyes.Thrownobjectswhichricochetcancauseseriousinjuryto
the eyes.
Wear sturdy, rough-soled work shoes and close-fitting slacks and•
shirts.Loosefittingclothesorjewelrycanbecaughtinmovable
parts. Never operate this machine in bare feet or sandals. Wear
leather work gloves when feeding material in the chipper chute.
Before starting, check all bolts and screws for proper tightness to•
be sure the machine is in safe working condition. Also, visually
inspect machine for any damage at frequent intervals.
Maintain or replace safety and instructions labels, as necessary.•
WARNING
This symbol points out important safety instructions which, if not
followed, could endanger the personal safety and/or property of
yourself and others. Read and follow all instructions in this manual
before attempting to operate this machine. Failure to comply with
theseinstructionsmayresultinpersonalinjury.Whenyouseethis
symbol,HEEDITSWARNING!
DANGER
This machine was built to be operated according to the safe opera-
tion practices in this manual. As with any type of power equipment,
carelessness or error on the part of the operator can result in
seriousinjury.Thismachineiscapableofamputatingfingers,hands,
toes and feet and throwing debris. Failure to observe the following
safetyinstructionscouldresultinseriousinjuryordeath.
WARNING
CALIFORNIA PROPOSITION 65
EngineExhaust,someofitsconstituents,andcertainvehicle
components contain or emit chemicals known to State of California
to cause cancer and birth defects or other reproductive harm.
WARNING
Your Responsibility—Restrict the use of this power machine to
persons who read, understand and follow the warnings and instruc-
tions in this manual and on the machine.
SAVE THESE INSTRUCTIONS!
4
SAFETY INSTRUCTIONS
Safe Handling of Gasoline:
Toavoidpersonalinjuryorpropertydamageuseextremecarein
handlinggasoline.Gasolineisextremelyflammableandthevaporsare
explosive.Seriouspersonalinjurycanoccurwhengasolineisspilled
on yourself or your clothes which can ignite. Wash your skin and
change clothes immediately.
Use only an approved gasoline container.•
Never fill containers inside a vehicle or on a truck or trailer bed•
with a plastic liner. Always place containers on the ground away
from your vehicle before filling.
When practical, remove gas-powered equipment from the truck•
ortrailerandrefuelitontheground.Ifthisisnotpossible,then
refuel such equipment on a trailer with a portable container, rather
thanfromagasolinedispensernozzle.
Keepthenozzleincontactwiththerimofthefueltankor•
container opening at all times until fueling is complete. Do not use
anozzlelock-opendevice.
Extinguishallcigarettes,cigars,pipesandothersourcesof•
ignition.
Never fuel machine indoors.•
Never remove gas cap or add fuel while the engine is hot or run-•
ning. Allow engine to cool at least two minutes before refueling.
Never over fill fuel tank. Fill tank to no more than ½ inch below•
bottomoffillernecktoallowspaceforfuelexpansion.
Replace gasoline cap and tighten securely.•
Ifgasolineisspilled,wipeitofftheengineandequipment.Move•
unit to another area. Wait 5 minutes before starting the engine.
Toreducefirehazards,keepmachinefreeofgrass,leaves,or•
other debris build-up. Clean up oil or fuel spillage and remove any
fuel soaked debris.
Never store the machine or fuel container inside where there is an•
open flame, spark or pilot light as on a water heater, space heater,
furnace, clothes dryer or other gas appliances.
OPERATION
Do not put hands and feet near rotating parts or in the feeding•
chambers and discharge opening. Contact with the rotating
impeller can amputate fingers, hands, and feet.
Before starting the machine, make sure the chipper chute, feed•
intake, and cutting chamber are empty and free of all debris.
Thoroughly inspect all material to be shredded and remove any•
metal,rocks,bottles,cans,orotherforeignobjectswhichcould
causepersonalinjuryordamagetothemachine.
Ifitbecomesnecessarytopushmaterialthroughtheshredder•
hopper, use a small diameter stick. Do not use your hands or feet.
Iftheimpellerstrikesaforeignobjectorifyourmachineshould•
start making an unusual noise or vibration, immediately shut
the engine off. Allow the impeller to come to a complete stop.
Disconnect the spark plug wire, ground it against the engine and
perform the following steps:
Inspectfordamage.a.
Repair or replace any damaged parts.b.
Check for any loose parts and tighten to assure continuedc.
safe operation.
Do not allow an accumulation of processed material to build up in•
the discharge area. This can prevent proper discharge and result
in kickback of material through the feed opening.
Do not attempt to shred or chip material larger than specified•
onthemachineorinthismanual.Personalinjuryormachine
damage could result.
Never attempt to unclog either the feed intake or discharge•
opening while the engine is running. Shut the engine off, wait until
all moving parts have stopped, disconnect the spark plug wire and
ground it against the engine before clearing debris.
Never operate without the shredder hopper, chipper chute, or•
chute deflector properly attached to the machine. Never empty or
change discharge bag while the engine is running.
Keep all guards, deflectors and safety devices in place and•
operating properly.
Keep your face and body back and to the side of the chipper•
chute while feeding material into the machine to avoid accidental
kickbackinjuries.
Never operate this machine without good visibility or light.•
Do not operate this machine on a paved, gravel or non-level•
surface.
Do not operate this machine while under the influence of alcohol•
or drugs.
Muffler and engine become hot and can cause a burn. Do not•
touch.
Never pick up or carry machine while the engine is running.•
Ifsituationsoccurwhicharenotcoveredinthismanual,usecare•
andgoodjudgement.ContactCustomerSupportforassistance
and the name of the nearest service dealer.
MAINTENANCE & STORAGE
Never tamper with safety devices. Check their proper operation•
regularly.
Check bolts and screws for proper tightness at frequent intervals•
to keep the machine in safe working condition. Also, visually
inspect machine for any damage and repair, if needed.
Before cleaning, repairing, or inspecting, stop the engine and•
make certain the impeller and all moving parts have stopped.
Disconnect the spark plug wire and ground it against the engine
to prevent unintended starting.
Do not change the engine governor settings or overspeed the•
engine.Thegovernorcontrolsthemaximumsafeoperatingspeed
of the engine.
5
SAFETY INSTRUCTIONS
Maintain or replace safety and instruction labels, as necessary.•
Follow this manual for safe loading, unloading, transporting, and•
storage of this machine.
Never store the machine or fuel container inside where there is an•
open flame, spark or pilot light such as a water heater, furnace,
clothes dryer, etc.
Allow machine to cool at least 5 minutes before storing.•
Always refer to the operator’s manual for proper instructions on•
off-season storage.
Ifthefueltankhastobedrained,dothisoutdoors.•
Observe proper disposal laws and regulations for gas, oil, etc. to•
protect the environment.
According to the Consumer Products Safety Commission (CPSC)•
and the U.S. Environmental Protection Agency (EPA), this product
has an Average Useful Life of seven (7) years, or 60 hours of
operation. At the end of the Average Useful Life have the machine
inspectedannuallybyanauthorizedservicedealertoensurethat
all mechanical and safety systems are working properly and not
wornexcessively.Failuretodosocanresultinaccidents,injuries
or death.
DO NOT MODIFY ENGINE
Toavoidseriousinjuryordeath,donotmodifyengineinanyway.
Tampering with the governor setting can lead to a runaway engine and
cause it to operate at unsafe speeds. Never tamper with factory setting
of engine governor.
NOTICE REGARDING EMISSIONS
Engines which are certified to comply with California and federal
EPA emission regulations for SORE (Small Off Road Equipment) are
certified to operate on regular unleaded gasoline, and may include
the following emission control systems: Engine Modification (EM),
OxidizingCatalyst(OC),SecondaryAirInjection(SAI)andThreeWay
Catalyst (TWC) if so equipped.
SPARK ARRESTOR
Ifasparkarresterisused,itshouldbemaintainedineffectiveworking
orderbytheoperator.IntheStateofCaliforniatheaboveisrequired
by law (Section 4442 of the California Public Resources Code). Other
states may have similar laws. Federal laws apply on federal lands.
A spark arrester for the muffler is available through your nearest Sears
Parts and Repair Service Center.
WARNING
This machine is equipped with an internal combustion engine and
should not be used on or near any unimproved forest-covered,
brushcoveredorgrass-coveredlandunlesstheengine’sexhaust
system is equipped with a spark arrester meeting applicable local or
state laws (if any)
6
SAFETY INSTRUCTIONS
SAFETY SYMBOLS
This page depicts and describes safety symbols that may appear on this product. Read, understand, and follow all instructions on the machine
before attempting to assemble and operate.
Symbol Description
READ THE OPERATOR’S MANUAL(S)
Read, understand, and follow all instructions in the manual(s) before attempting to assemble and
operate
WARNING— ROTATING BLADES
Keep hands out of inlet and discharge openings while machine is running. There are rotating blades
inside
BYSTANDERS
Keep bystanders, pets, and children at least 75 feet from the machine while it is in operation. Stop
machine if anyone enters the area.
WARNING— THROWN DEBRIS
Never operate without the chute deflector properly attached to the machine.
EYE PROTECTION
Always wear safety glasses or safety goggles when operating this machine.
WARNING: Your Responsibility—Restrict the use of this power machine to persons who read, understand and follow the
warnings and instructions in this manual and on the machine.
SAVE THESE INSTRUCTIONS!
7
SAFETY LABELS
DO NOT OPERATE THIS MACHINE
UNLESS THE CHUTE DEFLECTOR
HAS BEEN PROPERLY INSTALLED.
DANGER
TO AVOID SERIOUS INJURY:
•Read the owner's manual(s) before starting and
using unit.
•Keep all shields and guards in place and securely
attached.
•Keep hands, feet, face, clothing and long hair out of
Shredder Hopper, Chipper Chute and Discharge
Chute while the engine is running. Rotating cutting
blades inside these openings will cause serious
personal injury if contacted. Material being
processed
may bounce back from inlet openings or be thrown
from the discharge chute. Long hair or loose clothing
may be pulled sucked into the inlet openings.
•Do not place branches over 1/2 inch diameter into
the large Shredder Hopper. Branches over 1/2 inch in
diameter should be placed in the Small Chipper
Chute.
•If the chipped shredder jams or becomes clogged,
immediately shut off the engine and wait for all
moving parts to come to a complete stop before
clearing.
•Do not install remove, adjust, or service the
discharge screen or any other part while the engine
is running. Blade contact can occur.
DANGER
TO AVOID SERIOUS INJURY:
•Do not operate on uneven ground where unit is
unstable. Do not operate on pavement, gravel or
other hard surfaces since objects can ricochet
and cause injury.
•To avoid a fire hazard, keep leaves, grass, and other
combustible materials away from hot engine and
muffler.
•Keep children and others away from area of
operation.
•Wear approved safety glasses, gloves and ear
protection.
INSTRUCTIONS:
TO RAISE AND LOWER HOPPER
TO AVOID
EYE INJURY,
WEAR SAFTEY
GLASSES.
DO NOT DEPOSIT
MATERIAL LARGER THAN
1/2" DIAMETER IN LARGE
SHREDDER HOPPER.
THIS MAY DAMAGE
MACHINE.
WARNING
DANGER
ROTATING CUTTING BLADES.
KEEP HANDS AND FEET OUT
OF OPENINGS WHILE MACHINE
IS RUNNING.
DANGER
• ROTATING CUTTING BLADES.KEEP HANDS
AND FEET OUT OF OPENING WHILE
MACHINE IS RUNNING.
• DO NOT OPERATE THIS MACHINE UNLESS
THE CHUTE DEFLECTOR HAS BEEN
PROPERLY INSTALLED AND IS SECURED
WITH THE HAND KNOBS.
8
ASSEMBLY
IMPORTANT: This unit is shipped without gasoline or oil in the engine.
Be certain to service engine with gasoline and oil as instructed in the
Operation section of this manual before operating your machine.
NOTE: Reference to right and left hand side of the Chipper Shredder
is observed from the operating position.
OPENING CARTON
Cut each corner of the carton vertically from top to bottom.1.
Remove all loose parts.2.
Remove loose packing material.3.
REMOVING UNIT FROM CARTON
Lift unit from the rear to detach it from underlying carton material1.
and roll unit out of carton.
Check carton thoroughly for any other loose parts.2.
LOOSE PARTS IN CARTON
Hopper Assembly•
Bag•
Chute Deflector•
Chipper Chute•
Tamper•
Safety Glasses•
Engine Oil•
Owner’s Manual•
ATTACHING THE HOPPER ASSEMBLY
A.1. Removesixhexnutsandwashersfromtheweldstudsonthe
impeller housing. Do not remove support plate. See Figure 1.
B. Place hopper assembly into position in front of impeller
housing, aligning holes in hopper assembly collar with weld
studs.
C. Slide hopper assembly onto weld studs and replace washers
andhexnuts.Donottightencompletely.
2. A. Lift hopper assembly up to impeller bracket assembly. See
Figure 2.
B. Slide the release rod out slightly to hook the hopper bracket
onto the rod. See Figure 2.
C.Tightenthesixhexnutsthatsecurehopperassemblyto
impellerhousingandalsotightenthehexnutsthatsecure
hopper bracket to hopper assembly.
Figure 2
Figure 1
A
B
C
A
B
9
ASSEMBLY
Figure 3
ATTACHING THE CHUTE DEFLECTOR
A. Remove the wing knobs from each side of the lower impeller1.
housing. See Figure 3.
B.Removethehexlocknut,spacers,andhexboltfromthetopof
the impeller housing.
2. A. Align the chute deflector in position on the discharge opening
andinserthexboltwithspacerthroughhingeonchute
deflector (spacers fit inside of hinges). See Figure 4.
B.Placesecondspaceroverhexboltinsideotherhingeand
securewithhexlocknut.
C. Secure both sides of chute deflector to impeller housing using
wing knobs previously removed.
ATTACHING THE CHIPPER CHUTE
A.Removethethreecuppedwashersandhexnutsfromweld 1.
studs around the opening on the side of the impeller housing.
See Figure 5.
B.Removethehexbolts,flatwashers,andlocknutsfromthetwo
holes on the upper end of the support brace.
Figure 4
A
A
B
B
A
B
C
Figure 5
A
B
10
ASSEMBLY
2. A. Align the chipper chute over the weld studs, so the slot in the
bottom of the chute is facing down. See Figure 6.
B. Secure chipper chute with the three cupped washers (cupped
sideagainstthechipperchute)andhexnutspreviously
removed. Do not tighten the nuts at this time.
3. The chipper shredder was shipped with one end of the support
brace already secured to the lower frame. Loosen but do not
remove the bolts securing the brace to the frame.
A. Align the holes in the chute with the holes in the top of the
brace and attach brace to chipper chute with hardware
previously removed. The flat washers should be placed under
the bolt heads and against the inside surface of the plastic
chipper chute. Tighten securely. See Figure 7.
B. Tighten the bolts securing the support brace to the frame.
C. Tighten the three nuts on the weld studs holding the chipper
chute to the impeller housing.
ATTACHING THE BAG
To attach the bag:1.
A. Place the opening of the bag completely over the chute
deflector.
B. Pull on the drawstring until the bag is tight around chute
deflector opening.
C. Clip drawstring back on itself, tight against chute deflector to
secure into position. See Figure 8.
Figure 8
A
BC
Figure 7
A
BC
Figure 6
A
B
11
OPERATION
TAMPER
This plug is inserted into the chipper chute to push twigs and small
branches towards the impeller blades without endangering your hands.
THROTTLE CONTROL
This lever controls the engine speed and stop function. Through three
separate positions on the lever from left to right, the operation is as
follows:
CHOKE CONTROL
The choke control is used to choke the carburetor and assist in starting
the engine.
Meets ANSI Safety Standards
CraftsmanYardVacuumsconformtothesafetystandardoftheAmericanNationalStandardsInstitute(ANSI).
WARNING
Theoperationofanychippershreddercanresultinforeignobjects
being thrown into the eyes, which can damage your eyes severely.
Always wear the safety glasses provided with this unit or eye shields
beforechippingorshreddingandwhileperforminganyadjustments
or repairs.
Now that you have set up your chipper shredder for operation, get
aquainted with its controls and features. These are described below
and illustrated on this page. This knowledge will allow you to use your
new equipment to its fullest potential.
CHIPPER CHUTE
Allows twigs and small branches up to 3” in diameter to be fed into the
impeller for chipping. See Figure 9.
HOPPER ASSEMBLY
Allow leaves and small branches up to 1/2 diameter to be fed into the
impeller for chipping and shredding. Material can be raked into hopper
assembly by lowering the hopper assembly. See Figure 9.
RELEASE ROD
The release rod is located on the impeller bracket assembly and it
is used to release or lock the hopper when raising or lowering. See
Figure 9.
CHUTE DEFLECTOR
Chipped and shredded debris is discharged out the chute deflector.
The unit may be operated with or without the collection bag attached to
the chute deflector. See Figure 9.
Figure 9
Chute
Deflector
Oil Fill
Gas Fill
Release Rod
Tamper
(large) Hopper Assembly
(small) Chipper Chute
STOP
Start/ Run Slow/ Idle Engine Off
12
OPERATION
GAS AND OIL FILL-UP
Oil (one bottle shipped with unit)
First Time Use
Remove oil fill plug.1.
With the chipper shredder on level ground, use a funnel to empty2.
entire contents of oil bottle provided into the engine.
Replace oil fill plug and tighten.3.
Subsequent Uses
OnlyusehighqualitydetergentoilratedwithAPIserviceclassification
SF, SG, or SH. Select the oil’s SAE viscosity grade according to the
expectedoperatingtemperature.Followthechartbelow.
Although multi-viscosity oils (5W30, 10W30, etc.) improve starting
in cold weather, they will result in increased oil consumption when
used above 32°F. Check your engine oil level more frequently to avoid
possible engine damage from running low on oil.
Check the oil level by removing the oil fill plug and looking into1.
the oil fill hole. Oil should be visible up to the threads of the oil fill
plug, almost to the point of overflowing. Fill if necessary. Capac-
ityisapproximately28oz.Overfillingcancauseahazardous
situation,besuretowipeupanyspilledorexcessoil.
Replace oil fill plug and tighten.2.
Keep oil level at FULL. Running the engine with too little oil can3.
result in permanent engine damage.
Gasoline
WARNING
Useextremecarewhenhandlinggasoline.Gasolineisextremely
flammableandthevaporsareexplosive.Neverfuelmachineindoors
orwhiletheengineishotorrunning.Extinguishcigarettes,cigars,
pipes, and other sources of ignition.
Remove fuel cap from the fuel tank.1.
Make sure the container from which you will pour the gasoline is2.
clean and free from rust or foreign particles. Never use gasoline
that may be stale from long periods of storage in its container.
Gasoline that has been sitting for any period longer than four
weeks should be considered stale.
Fill fuel tank with clean, fresh, unleaded regular gasoline only. Do3.
not use gasoline containing METHANOL. Replace fuel cap.
NOTE: Check the fuel level periodically to avoid running out of gaso-
linewhileoperatingthechippershredder.Iftheunitrunsoutofgasas
it is chipping, it may be necessary to unclog the discharge area before
itcanberestarted.RefertoSERVICEANDMAINTENANCEsection.
TO START ENGINE
Attach spark plug wire and rubber boot to spark plug.1.
Fill tank to no more than 1/2 inch below bottom of filler neck to2.
providespaceforfuelexpansion.
Turn the fuel shut-off valve to the ON position.3.
Move the choke lever on the engine to CHOKE4. position. (A
warm engine may not require choking.) See Figure 10.
Move throttle control to START/RUN (Rabbit)5. position. See
Figure 10.
Standing behind the unit, grasp starter handle and pull rope out6.
until you feel a drag.
Oil Viscosity Chart
5W30
Colder Warmer
SAE30
CAUTION
Alcohol blended fuels (called gasohol or using ethanol or methanol)
can attract moisture which leads to separation and formation of acids
during storage. Acidic gas can damage the fuel system of an engine
while in storage.
CAUTION
To avoid engine problems, the fuel system should be emptied before
storage for 30 days or longer. Drain the gas tank, start the engine
and let it run until the fuel lines and carburetor are empty. Use
freshfuelnextseason.SeeSTORAGEInstructionsforadditional
information.
CAUTION
Never use engine or carburetor cleaner products in the fuel tank or
permanent damage may occur.
STOP
Figure 10
13
OPERATION
NOTE: A noise will be heard when finding the start of the compression
cycle. This noise is caused by the flails and fingers, which are part of
theshreddingmechanism,anditshouldbeexpecteduntiltheimpeller
reaches full speed.
Pull the rope with a rapid, continuous, full arm stroke. Keep a firm7.
grip on the starter handle. Let the rope rewind slowly.
Repeat, if necessary, until engine starts. When engine starts,8.
move choke control gradually toward the RUN position..
Ifenginefalters,movechokecontrolbacktowardtheCHOKE9.
position and repeat steps 5 though 8.
ALWAYS keep the throttle control in the START/RUN position10.
when operating the chipper shredder.
TO STOP ENGINE
Move throttle control lever to slow (turtle)1. position.
Whenever possible, gradually reduce engine speed before
stopping engine.
Move throttle control lever to STOP2. or OFF position.
Turn the fuel shut-off valve to the OFF position.3.
Disconnect spark plug wire and4. ground it against the engine to
prevent accidental starting while the equipment is unattended.
SHREDDING
Yard waste such as leaves and pine needles can be placed in the
hopper for shredding. After material has been processed by the shred-
der blade and flails, it will be forced out of the chute deflector, and, if
attached, into a debris collection bag.
Observe the following guidelines when shredding yard debris:
Never attempt to shred material other than normal yard debris•
(leaves, twigs, pine cones, etc.).
Avoid shredding fibrous plants such as tomato vines, palm fronds,•
etc., until they are thoroughly dried out. Fresh vines do not shred
well and tend to wrap themselves around the impeller and flails.
Place reasonable amounts of debris into the hopper at a time. Do•
not overload the hopper.
Allow the material in the hopper to be drawn into the blades and•
shredded before adding additional debris to the hopper. Failure to
due so may result in a clogged hopper, clogged chute deflector or
a stalled engine.
CHIPPING
Branches up to 3” in diameter can be fed into the chipper chute.
Observe the following guidelines when chipping branches:
Keep both hands firmly on the branch as you feed it into the•
chipper chute.
Never feed more than one branch into the chipper chute at a time.•
Never feed anything other than branches (or wood) into the•
chipper chute.
Apply intermittent pressure (force, in short pulses) while feeding•
larger (3-inch diameter) branches into the chipper chute, to avoid
bogging or stalling the engine.
IMPORTANT: Never feed branches with a diameter greater than
three (3) inches into the chipper chute. Doing so can result in serious
damage to your unit’s chipper blades, flails or impeller.
NOTE: For best performance, always operate the unit with sharp
chipperblades.Ifanoticeablelossinperformanceisencountered
while chipping branches, the chipper blades should be replaced.
LOWERING THE HOPPER ASSEMBLY
With one hand grasp the handle at the top of the hopper assem-1.
bly and lift slightly.
With the other hand pull out on the release rod and lower the2.
hopper assembly to the ground.
TO EMPTY BAG
Un-clip drawstring and loosen bag from chute deflector opening.1.
Empty bag and reattach to the discharge chute opening. Pull on2.
the drawstring until the bag is tight around the chute opening and
clip the drawstring tight against the chute deflector.
IMPORTANT: The flail screen is located inside the housing in the
dischargearea.Iftheflailscreenbecomesclogged,removeand
clean as instructed in the Service and Maintenance section. For best
performance, it is also important to keep the chipper blades sharp.
14
SERVICE AND MAINTENANCE
Clean area around the spark plug base. Do not sandblast spark•
plug. Spark plug should be cleaned by scraping or wire brushing
and washing with a commercial solvent.
Remove and inspect the spark plug. Check gap to make sure it is•
set at .030”. See Figure 11.
Replace the spark plug if electrodes are pitted, burned, or the•
porcelain is cracked.
GENERAL RECOMMENDATIONS
Always observe all safety rules found on product labels and in•
this operator’s manual when performing any maintenance. Safety
rules can be found on the product labels and in this Operator’s
Manual beginning on page 3.
The warranty on this chipper shredder does not cover items that•
havebeensubjectedtooperatorabuseornegligence.Toreceive
full value from warranty, operator must maintain the equipment as
instructed here.
Someadjustmentswillhavetobemadeperiodicallytomaintain•
your unit properly.
Periodically check all fasteners and make sure these are tight.•
ENGINE MAINTENANCE
Checking the Spark Plug
Clean spark plug and reset the electrode gap to 0.030” at least once a
season; replace every 100 hours of operation.
WARNING
Always stop engine and disconnect spark plug wire before performing
anymaintenanceoradjustments.Alwayswearsafetyglassesduring
operationorwhileperforminganyadjustmentsorrepairs.
Figure 11
Electrode Porcelain
.030 (.76 mm) gap
Interval Item Service Service Log
Each Use Engine oil level1.
Loose or missing hardware2.
Unit and engine.3.
Check1.
Tighten or replace2.
Clean3.
1st 5 - 8 hours Engine oil1. Change1.
25 hours Engine oil†1.
Air cleaner2.
Control linkages and pivots3.
Change1.
Replace2.
Lube with light oil3.
Annually or 50 hours Engine oil1.
Muffler2.
Change1.
Inspect2.
Annually or 100 hours Spark plug1. Clean, check and reset gap, or1.
replace spark plug.
Before Storage Fuel system1. Run engine until it stops from lack of1.
fuel or add a gasoline additive to the
gas in the tank.
† Under heavy load or in high temperatures
WARNING
Before performing any type of maintenance/service, disengage all
controls and stop the engine. Wait until all moving parts have come to
a complete stop. Disconnect spark plug wire and ground it against the
engine to prevent unintended starting. Always wear safety glasses during
operationorwhileperforminganyadjustmentsorrepairs.
Follow the maintenance schedule given below. This chart describes
service guidelines only. Use the Service Log column to keep track of
completed maintenance tasks. To locate the nearest Sears Service
Center or to schedule service, simply contact Sears at
1-800-4-MY-HOME®.
MAINTENANCE SCHEDULE
15
SERVICE AND MAINTENANCE
Servicing the Air Cleaner
The air cleaner prevents damaging dirt, dust, etc., from entering the
carburetor and being forced into the engine and is important to engine
life and performance. Never run the engine without an air cleaner
completely assembled.
Replace the air cleaner every 25 hours of operation.
Loosen screws that hold the air filter cover.1.
Open cover and remove air filter. See Figure 12.2.
Discard old air filter.3.
Installnewairfilter.4.
Close the cover and tighten screws.5.
NOTE:Ifthefilteristornordamagedinanyway,replaceit.
Check Engine Oil
Make sure engine is level and the area around oil fill cap is clean.1.
Remove oil fill cap.2.
Oil should be near the top of the oil fill cap threads, almost to the3.
point of overflowing
Change Engine Oil
OnlyusehighqualitydetergentoilratedwithAPIservice•
classification SF, SG, or SH. Select the oil’s SAE viscosity grade
accordingtotheexpectedoperatingtemperature.Refertoopera-
tion section for viscosity chart.
Change engine oil after the first five to eight hours of operation,•
and every fifty hours or every season thereafter. Change oil every
twenty five hours when operating engine under heavy load or in
high temperatures.
To Drain Oil
Run the engine to warm the oil.1.
With engine OFF but still warm, d2. isconnect the spark plug wire
and keep it away from spark plug.
Remove oil drain cap located at the base of the engine, and drain3.
oil into an appropriate receptacle. See Figure 13.
CAUTION
Usedoilisahazardouswasteproduct.Disposeofusedoilproperly.
Do not discard with household waste. Check with your local authori-
ties or Sears Service Center for safe disposal/recycling facilities.
When engine is drained of all oil, replace and tighten the oil drain4.
cap.
Withtheenginelevel,refillwithapproximately28oz.offreshoil.5.
Fill the oil up into the threads of the oil fill plug, almost to the point
of overflowing.
Replace the oil fill plug and wipe up any oil that may have spilled6.
or overflowed.
Replace spark plug wire before starting.7.
CAUTION
Donotusepressurizedairorsolventstocleantheaircleaner
cartridge.
Figure 13
End Cap
Oil Drain
Figure 12
Cover
Air Filter
16
SERVICE AND MAINTENANCE
REMOVING THE FLAIL SCREEN
WARNING
Before performing any type of maintenance on the machine, wait for
all parts to stop moving and disconnect the spark plug wire. Failure
tofollowthisinstructioncouldresultinpersonalinjuryorproperty
damage.
Ifthedischargeareabecomesclogged,removetheflailscreenand
clean area as follows:
Stop the engine. Make certain the chipper shredder has come to1.
a complete stop.
Disconnect spark plug wire from spark plug and ground against2.
the engine.
A. Remove the bag and two wing knobs on each side of the chute3.
deflector. See Figure 14.
B. Lift the chute deflector up to keep it out of the way.
C. Remove the two hairpin clips from each clevis pin which
extendthroughthehousingandremovepins.
D. Remove the flail screen from inside the housing and clean the
screen by scraping or washing with water. See Figure 14.
4. Reinstall the screen, making certain to reassemble the flail screen
with the curve side down.
5. Reattach the chute deflector with the hardware previously removed
and connect the bag to unit.
SHARPENING OR REPLACING CHIPPER
BLADES
Disconnect the spark plug wire and ground against the engine.1.
Remove the flail screen as instructed in the previous section.2.
Removethechipperchutebyremovingthreehexnutsand3.
washers.
Remove the chipper chute support brace from the frame by4.
removingthehexbolts.
Service Muffler
WARNING
Temperatureofmufflerandnearbyareasmayexceed150˚F(65˚C).
Avoid these areas.
Inspectmufflerevery50hours,andreplaceifnecessary.•
Replacement parts for the muffler must be the same and installed
in the same position as the original parts.
Clean Engine
Daily or before every use, clean grass, chaff or accumulated•
debris from engine. Keep linkage, spring, and controls clean.
Keep area around and behind muffler free of any combustible
debris.
Keeping engine clean allows air movement around engine.•
Engine parts should be kept clean to reduce the risk of overheat-•
ing and ignition of accumulated debris.
CAUTION
Do not use water to clean engine parts. Water could contaminate fuel
system. Use a brush or dry cloth.
Carburetor Adjustment
Thecarburetoronthisengineisnotadjustable.
Engine Speed
LUBRICATION
WARNING
Do not attempt to alter the engine speed by tampering with the
engine’s governor linkage. Doing so could result in serious personal
injuryanddamagetotheengine.TheengineRPMhasbeensetat
the factory.
Hopper Assembly• - Lubricate the pivot points on the hopper
assembly with light oil once a season.
Discharge Chute• - Lubricate the pivot points on the discharge
chute with light oil once a season.
Release Rod• - Lubricate the release rod and spring with light oil
once a season.
CLEAN EQUIPMENT
Clean the chipper shredder thoroughly after each use.•
Wash bag periodically with water. Allow to dry thoroughly in•
shade.
Iftheflailscreenbecomesclogged,removeandcleanas•
instructed below.
NOTE: Cleaning with a forceful spray of water is not recommended as
it could contaminate the fuel system.
Figure 14
A
B
C
D
17
SERVICE AND MAINTENANCE
Carefully separate the hopper assembly from the impeller as-5.
sembly and remove the shredder plate. The shredder plate can be
identified by referring to item 29 in the parts list on page 20 & 21.
NOTE: When reassembling the shredder plate, make certain the
embossed tab faces inward towards the impeller.
Remove the two wing knobs that secure the chute deflector and6.
raise the chute.
Inserta1/2”or3/4”diameterpipethroughtheflailscreenintothe7.
impeller to keep it from turning or remove the flail screen and
insert a piece of wood into the chute opening.
A.Removethetwointernalhexscrews,lockwashers,andhex8.
lock nuts which secure the shredder blade to the impeller.
B.Removethehexbolt,lockwasher,andflatwasherto
completely free shredder blade. See Figure 16.
Installareplacementblade(PartNo.742-0544)withthehardware9.
removedearlierorsharpenandreplaceexistingblade.
IMPORTANT: When reassembling the shredder blade, tighten center
bolt to between 550 and 700 in.-lbs. and the two outside bolts to
between 250 and 350 in.-lbs.
NOTE:Usea3/16”hexkey(Allen)wrenchontheoutsideofthe
shredderbladeanda1/2”box(orsocket)wrenchontheinsideofthe
shredderblade.HoldtheAllenwrenchstationaryandrotatethebox
(or socket) wrench to loosen the nut. Use caution when removing the
blade to avoid contacting the weld studs on housing.
IMPORTANT: When sharpening the blade, follow the original angle
ofgrindasaguide.Itisextremelyimportantthateachcuttingedge
receives an equal amount of grinding to prevent an unbalanced blade.
Anunbalancedbladewillcauseexcessivevibrationwhenrotatingat
high speeds and may cause damage to the unit. The blade can be
tested by balancing it on a screwdriver or nail. Remove metal from the
heavy side until it is balanced evenly.
Rotate impeller assembly by hand until you locate one of two5.
chipper blades in the chipper chute opening.
Removethebladebyremovingtheinternalhexscrews,lock6.
washers,andhexnutswhichsecureittotheimpeller.Retainthe
hardware. See Figure 15.
NOTE:Usea3/16”hexkey(Allen)wrenchontheoutsideoftheblade
anda1/2”box(orsocket)wrenchontheinsideoftheimpeller.Hold
theAllenwrenchstationaryandrotatethebox(orsocket)wrenchto
loosen the nut.
7.Installareplacementblade(PartNo.742-0544)withthehardware
removedearlierorsharpenandreplaceexistingblade.
IMPORTANT: When sharpening the blade, protect hands by using
gloves. Follow the original angle of grind and make sure to remove an
equal amount from each blade.
8.Toreplacetheotherblade,rotatetheimpellertoexposethe
second blade and repeat the steps above.
NOTE: Make certain blades are reassembled with the sharp edge
facing the same direction as when removed. Torque hardware to 250
- 300 in. lbs.
WARNING
The impeller’s chipper blades and shredder blade are sharp. Wear
leather work gloves to protect your hands.
SHARPENING OR REPLACING THE
SHREDDER BLADE
Stop the engine and make certain that all moving parts have1.
come to a complete stop.
Disconnect the spark plug wire and ground against the engine.2.
Lower the hopper assembly and place a block under the flail housing.3.
Removethesixhexlocknutsandflatwashersfromtheweld4.
studs on the flail housing. Retain the hardware.
Figure 15
Figure 16
A
A
B
Weld Studs
Flail Housing
Chipper Blade
Impeller
18
OFF-SEASON STORAGE
PREPARING THE ENGINE
For engines stored over 30 days:
To prevent gum from forming in fuel system or on carburetor1.
parts, run engine until it stops from lack of fuel or add a gasoline
additivetothegasinthetank.Ifyouuseagasadditive,runthe
engine for several minutes to circulate the additive through the
carburetor—after which the engine and fuel can be stored up to
sixmonths.
While engine is still warm, change the oil. See Change Engine Oil2.
inSERVICEANDMAINTENANCEsection.
Removesparkplugandpourapproximately1oz.(30ml)ofclean3.
engine oil into the cylinder. Pull the recoil starter several times to
distribute the oil, and reinstall the spark plug.
Clean engine of surface debris.4.
PREPARING THE CHIPPER SHREDDER
When storing the chipper shredder in an unventilated or metal•
storage shed, care should be taken to rustproof the non-painted
surfaces. Using a light oil or silicone, coat the equipment,
especially any springs, bearings, and cables.
Removealldirtfromexteriorofengineandequipment.•
Follow lubrication recommendations.•
Store equipment in a clean, dry area.• Donotstorenextto
corrosivematerials,suchasfertilizer.Do not store in an area
where equipment is present that may use a pilot light or has a
component that can create a spark.
WARNING
Never store chipper shredder with fuel in tank indoors or in poorly
ventilated areas where fuel fumes may reach an open flame, spark,
or pilot light as on a furnace, water heater, clothes dryer, or gas
appliance.
19
TROUBLESHOOTING
Problem Cause Remedy
Engine fails to start Throttle lever not in correct starting position1.
Choke not in the CHOKE position2.
Spark plug wire disconnected3.
Faulty spark plug4.
Fuel tank empty or stale fuel5.
Cannot pull recoil cord6.
Engine flooded7.
Move throttle lever to START/RUN position.1.
Move CHOKE to the CHOKE position.2.
Connect wire to spark plug.3.
Clean,adjustgap,orreplace.4.
Fill tank with clean, fresh gasoline.5.
Obstruction lodged in impeller. Disconnect spark6.
plugwireandremovelodgedobject.
Wait a few minutes to restart.7.
Engine runs erratically Unit running on CHOKE1.
Spark plug wire loose2.
Stale fuel3.
Water or dirt in fuel system4.
Dirty air cleaner5.
Low engine RPM6.
Carburetoroutofadjustment7.
Move choke lever to the RUN position.1.
Connect and tighten spark plug wire.2.
Fill tank with fresh gasoline.3.
Refill with fresh fuel.4.
Clean or replace air cleaner filter.5.
Always run engine at full throttle.6.
Contact your Sears Parts & Repair Center.7.
Engine overheats Engine oil level low1.
Air flow restricted2.
Fill engine with proper amount and type of oil.1.
Clean debris from around the engine’s cooling fins2.
and blower housing.
Engine hesitates at high RPMs Spark plug gap set too close1. Removesparkplugandadjustgap.1.
Engine idles poorly Fouled spark plug1.
Dirty air cleaner2.
Replacesparkplugandadjustgap.1.
Replace air cleaner cartridge.2.
Excessivevibration Loose parts or damaged impeller1. Stop engine immediately and disconnect spark plug1.
wire. Contact your Sears Parts & Repair Center.
Unit does not discharge 1. Chute deflector clogged
2.Foreignobjectlodgedinimpeller
3. Low engine RPM
Stop engine immediately and disconnect spark1.
plug wire. Clean flail screen and inside of discharge
opening.
Stop engine and disconnect spark plug wire.2.
Removelodgedobject.
Always run engine at full throttle.3.
Rate of discharge slows
considerably or composition of
discharged material changes
Low engine RPM1.
Chipper blade dull2.
Always run engine at full throttle.1.
Replace or sharpen chipper blade or contact your2.
Sears Parts & Repair Center.
WARNING
Before performing any type of maintenance/service, disengage all
controls and stop the engine. Wait until all moving parts have come to
a complete stop. Disconnect spark plug wire and ground it against the
engine to prevent unintended starting. Always wear safety glasses during
operationorwhileperforminganyadjustmentsorrepairs.
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20
PARTS LIST
Craftsman Chipper Shredder — Model No. 247.77638
34
38
35
A
A
B
B
20
2
34
37
28
34
34
35
35
34
8
25 123
48
7
7
21
19
9
2
11
14
3
27
5
13
34
13
16
15
11
18
18
11
24
16
30
6
38
40
34
29
41
38 34
33
10
10
12
38
38
22
39
26
32
36 31
17
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