Owner's Manual
CRAFTSMAN+
6.75 HORSEPOWER
21" REAR DISCHARGE
POWER PROPELLED
ELECTRIC START
ROTARY LAWN MOWER
Model No.
917.377631
• Safety
• Assembly
• Operation
• Maintenance
• Espa_ol
• Repair Parts
CAUTION:
Read and follow all
Safety Rules and Instructions
before operating this equipment
Sears, Roebuck and Co., Hoffman Estates, IL 60179
W_rrat_
S_fety_lules
A_ern_ly
Ol_era|on
M_intel_ance Sihelule|
M_intelhanle
2 Product Specifications 11
2 Service and Adjustments 14
4 Storage 14
6 Troubleshooting 16
10 Repair Parts 34
10 Parts Ordering Back Cover
ui
If
ON CRAFTSMAN POWER MOWER
purchase, when this Craftsman Lawn Mower is maintained,
according to the operating and maintenance instructions inthe
repair free of charge any defect in material or workmanship.
is used for commercial or rental purposes, this warranty
the date of purchase.
worn during normal use, such as rotary mower
:3 ;,air cleaners and spark plug.
• operator abuse or negligence, including bent crank- _
shafts arld,the failure to the equipment according to the instructions con-
tained in the owner's manual.
Warranty service is available by returning the Craftsman power mower to the nearest
Sears Service Center/Department inthe United States. This warranty applies only while
this product is in use in the United States.
This Warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
SEARS, ROEBUCKAND CO., D/817 WA, HOFFMAN ESTATES, ILLINOIS 60179
TRAINING:
• Read this operator's manual carefully.
Become familiar with the controls and
know how to operate your mower
properly. Learn how to quickly stop
mower.
• Do not allow children to use your mower.
Never allow adults to use mower without
proper instructions.
• Keep the area of operation clear of all
persons, especially small children and
pets.
• Use mower only as the manufacturer
intended and as described in this manual.
• Do not operate mower if ithas been
dropped or damaged in any manner.
Always have damage repaired before
using your mower.
• Do not use accessory attachments that
are not recommended by the manufac-
turer. Use of such attachments may be
hazardous.
• The blade turns when the engine is
running.
PREPARATION:
• Always thoroughly check the area to be
mowed and clear itof all stones, sticks,
wires, bones, and other foreign objects.
These objects will be thrown by the blade
and can cause severe injury.
• Always wear safety glasses or eye
shields when starting and while using
your mower.
• Dress properly. Do not operate mower
when barefoot or wearing open sandals.
Wear only solid shoes with good trac_tion
when mowing.
2
• Check fuel tank before starting engine.
Do not fill gas tank indoors, when the
engine is running or when the engine is
hot. Allow the engine to cool for several
minutes before fillingthe gas tank. Clean
off any spilled gasoline before starting the
engine.
• Always make wheel height adjustments
before starting your mower. Never
attempt to do this while the engine is
running.
• Mow only in daylight or good artificial
light.
OPERATION:
• Keep your eyes and mind on your mower
and the area being cut. Do not let other
interests distract you. ---
• Do not mow wet or slippery grass. Never
run while operating your mower. Always
be sure of your footing -- keep a firm
hold on the handles and walk.
• Do not put hands or feet near or under
rotating pads. Keep clear of the discharge
opening at all times.
• Always stop the engine whenever you
leave or are not using your mower, or
before crossing driveways, walks, roads,
and any gravel--covered areas.
• Never direct discharge of material toward
bystanders nor allow anyone near the
mower while you are operating it.
• Before cleaning, inspecting, or repairing
your mower, stop the engine and make
absolutely sure the blade and all moving
parts have stopped. Then disconnect the
spark plug wire and keep it away from the
spark plug to prevent accidental starting.
• Do not continue to run your mower ifyou
hit a foreign object. Follow the procedure
outlined above, then repair any damage
before restarting and operating you
mower.
• Do not change the govemor settings or
overspeed the engine. Engine damage or
personal injurymay result.
• Do not operate your mower if it vibrates
abnormally. Excessive vibration is an
indication of damage; stop the engine,
safely check for the cause of vibration
and repair as required.
• Do not run the engine indoors. Exhaust
fumes are dangerous.
• Never cut grass by pulling the mower
towards you. Mow across_e fame_f--
slopes, never up and down or you might
lose your footing. Do not mow exces-
sively steep slopes. Use caution when
operating the mower on uneven terrain or
when changing directions -- maintain
good footing.
• Never operate your mower without proper
guards, plates, grass catcher or other
safety devices in place.
MAINTENANCE AND STORAGE:
• Check the blade and the engine mounting
bolts often to be sure they are tightened ,.,.
properly.
• Check all bolts, nuts and screws at
frequent intervals for proper tightness to
be sure mower is in safe working
condition.
• Keep all safety devices in place and
working.
• To reduce fire hazard, keep the engine-
free of grass, leaves or excessive grease
and oil.
• Check grass catcher often for deteriora-
tion and wear and replace wom bags.
Use only replacement bags that are
recommended by and comply with
specifications of the manufacturer of your
mower.
• Always keep a sharp blade on your
mower.
• Allow engine to cool before storing in any
enclosure.
• Never store mower with fuel inthe tank
inside a building where fumes may reach
an open flame or an-ignition-source such
as a hot water heater, space heater,
clothes dryer, etc.
CAUTION: Always disconnect spark plug
wire and place wire where it cannot
contact spark plug in order to prevent
accidental starting when setting up,
transporting, adjusting or making repairs.
WARNING
The engine exhaust from this product
contains chemicals known to the State of
C_);fornia to cause cancer, birth defects, or
oth_r reproductive harm.
3
Theseaccessorieswereavailablewhenthislawnmowerwasproduced.Theyar_so
availableatmostSearsretailoutletsandservicecenters.MostSearsstores can also oerc_
repair partsfor you,when you providethe model number of your lawn mower. Some of these
accessoriesmay notapplytoyour lawn mower.
LAWN MOWER PERFORMANCE
CUPPING DEFLECTOR
FOR REAR DISCHARGE LAWN MOWERS
GRASS CATCHERS
FOR
REAR DISCHARGE
LAWN MOWERS
MULCHER KITS
GRASS CATCHERS
FOR "
SIDE DISCHARGE
LAWN MOWERS +-
STABlUZER
GAS CANS
LAWN MOWER MAINTENANCE
MUFFLERS AIR FILTERS
BELTS BLADES
BLADE ADAPTERS WHEELS
+
SPARK PLUGS
ENGINE OIL
Read these instructions and this manual in
its entirety before you attempt to assemble
or operate your new lawn mower. Your
new lawn mower has been assembled at
the factory with the exception of those
parts left unassembled for s_ipping
purposes. To ensure safe and proper
operation of your lawn mower, all parts
and hardware you assemble must be
tightened securely. Use the correct tools
as necessary to ensure proper tightness.
All parts such as nuts, washers, bolts, etc.,
necessary to complete the assembly have
been placed in the parts bag.
TO REMOVE LAWN MOWER FROM
CARTON
• Remove loose parts included with
mower.
• Cut down two end corners of carton and
lay end panel down flat.
• Remove all packing materials except
padding between upper and lower
handle and padding holding operator
presence control bar to upper handle.
Roll lawn mower out of carton and check
carton thoroughly for additional loose
pads.
HOW TO SET UP YOUR LAWN
MOWER ......... -.....
TO UNFOLD HANDLE
IMPORTANT: Unfold handle carefully so
as not to pinch or damage control cables.
• Raise lower handle section to operating
position and squeeze the bottom ends of
lower handle towards each other until
the pin in handle can be inserted into
one of the three height adjustment
holes.
• Remove protective padding, raise upper
handle section into place on lower
handle and tighten both handle knobs.
• Remove any packing material from
around control bar.
• Your handles may be adjusted for your
mowing comfort. Refer to Service and
Adjustments section of this manual.
4
Operator presence
control,bar
Upper handle
Lower
handle
3-position
Handle
adjustment
bracket
Mowing
position
Handle
pin
J
TO INSTALL ATTACHMENTS
Your lawn mower was shipped ready to be
used as a mulcher. To convertto4N_jgirlg
or discharging:
• Open rear door and remove mulcher
plug. Store mulcher plug in a safe
place.
• You can now install catcher or optional
clipping deflector.
• To retum to mulching operation, install
mulcher plug into discharge opening of
mower.
Mulcher Plug
TO PREPARE BATTERY
NOTE: Your battery must be charged
before you can start your lawn mower.
• Disconnect engine battery connector
(male) from battery connector (female)
• Connect battery charger connector
(male) to battery connector (female).
• Plug battery charger into 110 volt A.C.
outlet.
• Leave battery charger connected for 24
hours before starting your engine for the
first time.
• After charging, connect engine connec-
tor (male) to battery connector (female).
Your engine has an integral alternator for
partial charging. Connect your battery
charger to charge battery as required.
IMPORTANT: The engih-e_alt-ei'fi_f6r-will
not charge a discharged battery.
At the end of the mowing season the
battery should be charged for 48 hours to
protect the battery during winter storage.
CAUTION: Always disconnect the engine
connector (male) from the battery
connector (female) to prevent accidental
starting when transporting or storing your
lawn mower after the season.
5
READ THIS OWNER'S MANUALAND SAFETY RULES BEFORE OPERATING YOU'_,WN
k4OWER. Compare the illustrations with your lawn mower to familiarize yourself with the
kx_ationof various controls and adjustments. Save this manual for future reference.
These symbols may appear on your lawn mower or in literature supplied with the product.
Learn and understand their meaning.
CAUTION ENGINE ENGINE FAST SLOW CHOKE FUEL OIL DANGER, KEEP HANDS
OR WARNING ON OFF AND FEET AWAY
<NOW YOUR LAWN MOWER
Ddve control
Electric start key_
Operator presencecontrol
Starter handle
Cable clip
Grass catcher
Wheel adjuster
lever
Gasoline cap
Primer
Engine oil cap w/dipstick
Housin.c
MEETS CPSC SAFETY REQUIREMENTS
Sears rotary walk-behind power lawn mowers conform to the safety standards of the
American National Standards Institute and the U.S. Consumer Product Safety Commis-
sion. The blade turns when the engine is running,
Operator presence control - must be
held down to the handle to start the
engine. Release to stop the engine.
Primer - pumps additional fuel from the
carburetor to the cylinder for use when
starting a cold engine.
Starter handle - used for starting the
engine.
Drive control bar - used to engage
power-propelled foward motion of lawn
mower.
Mulcher plug - Located at the rear
discharge opening must be removed when
converting to bagging operation.
Electric start key - used for starting the
engine.
6
The ()peration ofany lawn mowercan resultin
foreign objectsthrown intothe eyes, which can
resultin severe eye damage. Alwayswear
safety glasses or eye shieldswhile operating
your lawn mower or performingany adjust-
mentsor repairs. We recommend awide
visionsafety mask overthe spectacles or
standardsafetyglasses.
HOW TO USEYOUR LAWN MOWER
ENGINE SPEED
The engine speed was set at the factory for
optimum performance. Speed isnotadjust-
able.
ENGINE ZONE CONTROL
CAUTION: Federal regulationsrequirean
engine controlto be installedon this lawn
mower in order to minimize'the riskofblade
contact injury.Do notunder any circu_
attempt to defeat the function of the operator
control.The bladetums when the engine is
running.
• Your lawn mower is equipped withan
operator presence controlbar which
requiresthe operator tobe positioned
behind the lawn mOwer handle tostart and
operate the lawn mower.
TO ADJUST CUTTING HEIGHT
• Allfour wheals are adjustedby a single
lever.
• Pull adjuster levertoward wheel. To raise
mower, move lever forward to desired
position.To lower mower, move the lever
toward the rear.
LowerWheels forhigh cut
\
Acluster
Lever
J
Raise Wheels for low cut
TO OPERATE DRIVE SYSTEM
• To startforward motion, liftdrive controlbar
upto handle.
• To stop forward motion,release drive
control bar.
IMPORTANT: Always keep drive controlbar
fully engaged against handle when in use.
Drive
Operatorpresence controlbar
controlbar--
Toengage_'_ Drivecontrol
drive control desengaged
TO ATTACH GRASS CATCHER
• Liftthe rear doorofthe lawn mower and
place the grasscatcher frame hooksintothe
slotsofthe rear door.
• The grasscatcher issecured tothe lawn
mower housingwhen the reardoor is
lowered onto the grass catcher frame.
CAUTION: Do not runyour lawn mower
withoutclippingdeflectoror approved grass
catcher in place. Never attempt to operate the
lawn mower withthe rear door removed or
propped open.
Rear door
slots
Grass
handle
Catcher frame
hook
TO EMPTY GRASS CATCHER
• Liftup on grasscatcher using the frame
handle.
• Remove grasscatcher with clippingsfrom
under lawn mower handle.
• Empty d'_opingsfrom bag using both frame
handle and bag handle.
NOTE: Do not drag the bag when emptying;
itwillcause unnecessary wear.
/
BEFORE STARTING ENGINE__
OIL
Your lawn mower isshipped withoutoilinthe
engine.
• Be sure mower is leveland area around oil
fillis dean.
• Remove engineoilcap w/dipstickand fill to
the full lineonthe dipstick.
• Use 20 ozs. of oil. For type and grade of oil
to use, see =ENGINE" in Maintenance
sectionof this manual.
• Pour oilslowly. Do notover fill.
• Check oillevelbefore each use. Add oilif
needed. Filltofull lineon dipstick.
• To read properlevel, tightenengine oilcap
each time.
• Reinstallengine oilcap and tighten.
7
• Change the oilafter every 25 hoursof
operationor each season. You may need
to change the oilmore often underdusty,
dirtyconditions.
GAS
• Fill fuel tank. Use fresh, clean, regular
unleaded gasoline with a minimum of 87
octane. (Use of leaded gasoline will
increase carbon and lead oxide deposits
and reduce valve life). Do not mix,oil
with gasoline. Purchase fuel in quanti-
ties that can be used within 30 days to
assure fuel freshness.
IMPORTANT: WHEN OPERATING IN
TEMPERATURES BELOW 32°F(0°C), use
fresh, clean winter grade gasoline to help
insure good cold weather starling.
WARNING: Experience indicates that
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. To avoid engine
problems, the fuel system should be
emptied before storage of 30 days or
longer. Drain the gas tank; start the
engine and let it run until the fuel lines and
carburetor are empty. Use fresh fuel next
season. See Storage Instructions for
additional information. Never use engine
or carburetor cleaner products in the fuel
tank or permanent damage may occur.
CAUTION: Fill to bottom of gas tank filler
neck. Do not overfill. Wipe off any spilled
oil or fuel. Do not store, spill or use
gasoline near an open flame.
Gasolinefiller
Engineoil cap
w/dipstick j cap
TO START ENGINE
• To start a cold engine, push primer five
(5) times before trying to start. Use a
firm push. This step is not U_Jall_ -
necessary when starting an engine
which has already run for a few minutes.
• Hold operator presence control bar
down to the handle.
• Tum electric start key clockwise to crank
engine.
IMPORTANT: Do not crank engine more
than five continuous seconds between
each time you try to start. Wait 5 to 10
seconds between each attempt.
• To start engine using the auxiliary
starter handle, follow the steps above.
Exchange the use of the start key for-_
starter handle. Pull starter handle
quickly. Do not allow starter rope to
snap back.
• To stop engine, release operator
presence control bar.
NOTE: In cooler weather it may be
necessary to repeat priming steps. In
warmer weather over priming may cause
flooding and engine will not start. If youdo
flood engine wait a few minutes before
attempting to start and do not repeat
priming steps.
MOWING TIPS
• Under certain conditions, such as very tall
grass,it may be necessary to raisethe
heightof cutto reduce pushingeffortand to
keep fromoverloadingthe engine and
leavingclumps of grass clippings.
• For extremely heavy cutting,reduce the
width of cut by overlapping previously cut
path and mow slowly.
• When using a rear discha_ la_WTrnowerin
moist, heavy grass, dumps of cut grass
may not enter the grass catcher. Reduce
groundspeed (pushing speed) and/or run
the lawn mower overthe area a second
time.
• Ifa trailof clippingsislefton the rightside of
a rear discharge mower, mow in a clock-
wise directionwith a small overlap tocollect
the dippings on the next pass.
• Pores in clothgrass catcherscan become
filledwith dirtand dustwith use and
catchers willcollectless grass. To prevent
this, regularlyhose catcher offwithwater
and letdry before using.
• Keep top of engine around starterclearand
clean of grass clippingsand chaff. This will
help engine air flow and extend engine life.
8
MULCHING MOWING TIPS
IMPORTANT:Forbestperformance,keep
mowerhousingfree of built-upgrass and
trash.See =Cleaning" in Maintenance section
of this manual.
• The special mulchingblade WIUrecut the
grass cr=ppingsmany times and reduce
them in size so that as they fagonto the
lawn they will disperse intothe grass and
not be noticed. Also,the mulched grass will
biodegrade quicklyto providenutrientsfor
the lawn. Always mulch withyour highest
engine (blade) speed as this wRIprovidethe
best recuffingaction ofthe blades.
• Avoid cuttingyour lawn when it is wet. Wet
grass tends toform dumps and interferes
with the mulchingaction:-The best time to
mow your lawn is the early aftemoon. At
this time the grass has driedand the newly
cut area will notbe exposed to the direct
sun.
• For best results,adjustthe lawn mower
cuttingheight sott'_t the lawn mower cuts
offonlythe topone-third ofthe grasFblades.
Ifthe lawn is overgrownit willbe,meesSary
to raisethe height of cutto reduce pushing
effortand to keep from overloadingthe
engine and leavingclumps ofmulched
grass. For extremely heavy mulching,
reduce your widthof cutby overlapping•
previouslycutpath and mow slowly.
• Certaintypes of grass and grass conditions
may require thatan area be mulched a
second time to completelyhidethe
clippings. When doinga second cut,mow
acrossor perpendiculartothe firstcut path.
• Change yourcuttingpattem from week to
week. Mow north tosouthone weektherr-.
change to east towest the next week. This
will help prevent mating and grainingofthe
lawn.
Max,/3
. °", i 1 .
9
ASYOUCOMPLETE
Ir _".,'_ -It
Checkfor LooseFasteners
Clean/InspectGrassCatcher
,(IfEquipped)
v'
v'
v'
v'
v'
v'3
Clean La_m Mower
Clean Under Drive Cover
W, {Power-Propelled Mowers)Check drive belt/pulleys
,(Power-Propelled Mowers)
R Check/Sharpen/Replace Blade
Lu_caUonChart V' V'
Clean Battery/Recharge ....
(Electric Start Mowers) _ Ik/4
RECheck EngineOilLevel
Change Engine Oil _1_1._
Clean Air Fdter
Inspect Muffler
N Clean or Replace Spark Plug
Replace Air Filter Paper Cartridge If 2
1- Change moreoftenwhenoporaHngunder aheavyloador klhlghamblemlem_ms.
2 - SeNice more oftenwhenopemlk_ In di_yordustyconddJons.
3 - Replace bladesmornoftenwhenmowingin sandysoiL
4 - Charge 48 houmat end ofseason.
GENERAL RECOMMENDATIONS
The warranty on this lawn mower does not
cover items that have been subjectedto
operator abuse or negligence. To receivefull
value from the warranty,operator must
maintain mower as instructedinthis manual.
Some adjustments willneed to be made
periodicallyto propertymaintainyour unit.
All adjustments in the Service and Adjust-
ments section ofthis manual shouldbe
checked at least once each season.
• Once a year, replace the spark plug,
replace airfilterelement and check blade for
wear. A new spark plugand clean/new air
filterelement assures proper air-fuelmixture
and helpsyour engine rail betterand last
longer.
• Followthe maintenance schedule in this
manual.
BEFORE EACH USE
• Check engine oillevel.
• Check for loosefasteners.
LUBRICATION
Keep unitwell lubricated(See "LUBRICATION
CHART").
LUBRICATION CHART
(_ Engineoil (_ Wheel
adjuster
(_)- Drive pins
__0 _Brake....
spring
bracket
(_ Rear
door
(_0 Spray lubricant
hinge
(_ Refer to Maintenance "ENGINE"
section.
IMPORTANT: Do not oilor grease plastic
wheel bearings.Viscouslubricantswill
attractdust and dirtthat will shorten the
lifeofthe selflubricatingbearings. If you
feel they mustbe lubricated,use only a
dry,powderedgraphitetype lubricant
spa ngly.
10
PRODUCT SPECIFICATIONS
MODEL NUMBER 917.377631
SERIAL NUMBER
DATE OF PURCHASE
HORSEPOWER: 6.75
DISPLACEMENT: 12.56 CU. IN.
GASOLINE CAPACITY/TYPE: 1.25 QUARTS
UNLEADED REGULAR
OIL TYPE (API-SF/SG/SH): SAE 30 (ABOVE 32°F)
SAE 5W,,30 (BELOW 32°F)
OIL CAPACITY: 20 OZS.
SPARK PLUG(GAP: .030") CHAMPION RN4C
VALVE CLEARANCE: INTAKE: .004 - .008
EXHAUST: .004 - .008
SOLID STATE IGNITION
AIR GAP: .0125 IN.
BLADE BOLT TORQUE: 35-40 FT. LBS.
• The model and serial numbers will be found on a decal attached to the rear of the
lawn mower housing.Record both serial number and date of purchase in space
provided above.
.AWN MOWER
Always observe safety rules when performing
any maintenance.
TIRES
• Keep tires free of gasoline,oil,or insect
controlchemicals which can harm rubber.
• Avoid stumps,stones, deep ruts,sharp
objects and other hazards that may cause
tiredamage.
BLADE CARE
Forbest results,mower blade must be kept
sharp. Replace bent or damaged blades.
TO REMOVE BLADE
• Disconnect spark plug wire from spark plug
and place wire where itcannot come in
contactwith spark plug.
• Turn lawn mower on itsside. Make sure air
filterand carburetor are up.
• Use a wood block between blade and
mower housingto preventblade from
tumingwhen removing blade bolt.
• Protectyour hands withgloves and/or wrap
blade with heavy cloth.
• Remove blade boltby turningcounter-
clockwise.
• Remove blade and attachinghardware
(bolt,lockwasher and hardened washer).
NOTE: Remove the blade adapter and check
the key inside hubof bladeadapter. The key
must be in good conditionto work properly.
Replace adapter ifdamaged.
TO REPLACE BLADE
IMPORTANT:
treated.
• Position the blade adapter on the engine
crankshaft. Be sure key=in-adapterand
crankshaft keyway are aligned.
• Positionblade on the blade adapter aligning
the two (2) holesin the bladewith the raised
lugsonthe adapter.
• Be sure the trailingedge ofblade (opposite
sharp edge) isuptoward the engine.
• Installthe bladeboltwiththe lockwasher
and hardened washer intoblade adapter
and crankshaft.
• Use blockofwood between blade and lawn
mower housingand tightenthe blade bolt,
tuming clockwise
The recommendedtightening torque is35-
40ft. Ibs.
Bladeboltisgrade_8heat
11
NOTE: We donotrecommendshaq_ning
blade-butifyoudo, besurethebladeis
balanced.
TO SHARPEN BLADE
Care should be taken to keep the blade
balanced. An unbalanced blade wiUeause
eventual damage to lawn mower or engine.
. The blade can be sharpened .with a fileor
on a grindingwheel. Do not attemptto
sharpen while onthe mower.
• To check blade balance, drive a nailintoa
beam or walL Leave about one inchofthe
straightnagexposed. Place center holeof
blade over the head of thenail. If blade is
balanced, itshould remain in a horizontal
position, if eitherend of thQblade moves
downward, sharpen the heavy end unblthe
blade isbalanced.
Key
Blade,
Blade
bolt
Blade Crank-
adaptor shaft
keyway
• Lock
washer Crank-
Hardened Blade
washer Trailing shaft
edge adaptor
GRASS CATCHER
• The grass catcher may be hosed with
water, but must be dry when used.
• Check your grass catcher often for
damage or deterioration. Through
normal use itwill wear. If catcher needs
replacing, replace only with a manufac-
turer approved replacement catcher.
Give the lawn mower model number
when ordering.
DRIVE WHEELS
Check rear drive wheels each time you
mow to be sure they move freely. The
wheels not tuming freely means trash,
grass cuttings, etc., may be inside the
drive wheel and dust cover area and must
be cleaned out to free drive wheels.
If necessary to clean the drive wheels,
check both rear wheels.
• Remove hubcaps and Iocknuts.
* Remove wheels from wheel adjuster
axles.
• Remove any trash or grass cuttings from
inside the dust cover, pinion and/or drive
wheel gear teeth.
12
• The pinion gear must be installed with
the left gear on the left side and with the
right gear on the rightside, from an
operator's view.
• The pinion gear is stamped with an "L"
(left) or "R" (right) on the inside. If
installed incorrectly, the drive system will
not work.
• Place wheels back on adjuster axles.
• Replace Iocknuts and hubcaps.
NOTE: Pinions and drive pawls should be
cleaned and lubricated with grease
approximately every 25 hours or once a
year.
LocknutWash_^o"_
Drive pin
Dust cover
Pinion
E-dng
ENGINE _.
LUBRICATION
Use onlyhighquarrydetergentoil ratedwith
AP! service classificationSF, SG or SH.
Select the oil'sSAE viscositygrade according
to yourexpected operatingtemperature.
SAE VISCOSITY GRADES
4 I,
=IF -20" 0" 30" 32" 40" 60" 80° 100"
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE
NOTE: Althoughmulti-viscosityoils(5W30,
10W30 etc.) improvestartingincold weather,
these multi-viscosityoilswillresultin increased
oilconsumption when used_abo-Ve32°F..
Check your engineoillevel more frequently to
avoidpossibleengine damage from running
low ono=1.
Change the oilafterevery 25 hours of
operationor at least once a year ifthe lawn
mower isnot usedfor 25 hours in one year.
Check the crankcase oillevel before starting
the engine and aftereach five(5) hours of
continuoususe. Tighten oil plug securelyeach
timeyou check the oillevel.
TOCHANGE ENGINE OIL
NOTE: Before tippinglawnmower to drain oJ,
drainfuel tank by runningengine unb'lfuel tank
isempty.
• Disconnect spark plugwirefrom spark plug
and place wire where itcannot come in
contact sparkplu
• Remove engine oilcap;lay aside on a clean
surface.
• Tip lawn mower on itsside as shown and
drainoil intoa suitablecontainer. Rock lawn
mower back and forth to remove any oil
trapped inside ofengine.
• W'_eeoff any spilledoilon lawn mower and
on side of engine.
• Fill engine with oil. RII only tothe =FULL"
line on the dipstick. DO N(_T OVER RLL
• Replace engine oil cap.
• Reconnect spark plugwire to spark plug.
Container
AIR FILTER
Your engine will not run properly and may
be damaged by using a dirty air filter.
Replace the air filter every year, more
often if you mow in very dusty, dirty
conditions. Do not wash air filter.
TO CHANGE AIR FILTER
• Remove the air filter by turning clock-
wise to the stop and pull away from
collar.
• Remove filter from inside of cover.
• Clean the inside of the cover and the
collar to remove any dirt accumulation.
• Insert new filter into cover.
• Put air filter cover and filter into collar
aligning the tab with the slot.
• Push in on cover and tum counterclock-
wise to tighten.
Coil
Clip
Tum
clockwiseto
remove
Air filter
Tab
counter-
clockwise
to
Air filter
tighten
cover
MUFFLER ";
Inspect and replace corrodedmuffleras it
couldcreate afirehazard and/or damage.-
SPARK PLUG
Change your spark plug each year to make
your engine start easier and run better. Set
spark pluggap at .030 inch.
CLEANING
IMPORTAN'E For best performance, keep
mower housingfree of built-upgrassand trash.
Clean undersideof mower housingafter each
use.
CAUTION: Disconnectspark plug wire from
spark plugand place wire where itcannot
come in contactwiththe spark plug.
• Turn lawn mower on itsside. Make sureair
filter and carburetorare up. Clean the
undersideofyour lawn mower by scraping
to remove build-upof grass and trash.
• Clean engine oftento keep trashfrom
accumulating.A dogged engine runshotter
and shortensengine life.
• Keep finished surfaces and wheels free of
allgasoline,oil,etc.
• We do not recommend using-a'_tdeh hose
toclean lawn mower unlessthe electrical
system,muffler,air filterand carburetorare
covered to keep water out. Water in engine
can resultin shortened engine life.
13
CAUTION; BEFOREPERFORMING ANY
SERVICE OR ADJUSTMENTS:
= Release €ontrolbar.
° Make surethe bladeand all moving
partshavecomp steppecL
• Disconnectsparkplugwirefrom
spark plugand place where itcannot
come incontact withplug.
LAWN MOWER
TO ADJUST cUTnNG HEIGHT
See "TOADJUSTCUTI'ING HEIGHT"inthe
Operationsectionofthis manual.
REAR DEFLECTOR ....
The rear detlector,attached between the rear
wheels of your lawn mower, isprovidedto
minimize the possibilitythat objectswillbe
thrown out the rear ofthe lawn mower intothe
operator'smowing position. Ifthe rear
deflectorbecomes damaged, itshould be
TO ADJUST HANDLE
The handle onyour lawn mower hasthree (3)
height positions- adjustto heightthat suits
you.
• Squeeze the bottom ends of lowerhandle
towards each otheruntilthe pinin handle
can be inserted intoone of the three height
adjustment holes.
High
Med.
Low
/ 3-position
Handle
adjustment
bracket
ENGINE ..
ENGINE SPEED
Yourengine speed has been factoryset.- Do
not attempt to increase enginespeed or it
may resultin personal injury. Ifyou believe
thatthe engine is runningtoo fast or too slow,
take your lawn mower to an authorized
servicecenter/departmentfor repairand
adjustmenL
CARBURETOR
Yourcarburetorhas a non-adjustablefixed
mainjet for mixturecontrol. If yourengine
doesnot operate properlydue to suspected
carburetorproblems, take your lawn mower to
an authorized service center/departmentfor
repairand adjustment.
Immediately prepare your lawn mower for
storage at the end ofthe season or ifthe unit
will notbe used for 30 days or more.
LAWN MOWER
When lawn mower is to be storedfora period
oftime, clean itthoroughly, remove all dirt,
grease, leaves, etc. Store in a clean, dry area.
• Clean entire lawn mower (See "CLEANING"
in the Maintenance section of this manual).
• Lubricate as shown in the Customer
Maintenance section of this manual.
• Be sure that all nuts, bolts,screws, and pins
are securely fastened. Inspect moving
partsfor damage, breakage and wear.
Replace if necessary.
• Touch up all rusted orchipped paint
surfaces;sand lightlybefore painting.
HANDLE
• You canfold your lawn mower handle for
storage.
• Loosenthe two (2) handle Imobson-sides of
the upper handle and allow handle tofold
downto the rear.
• Squeeze the bottomends oflower handle
toward each other untilpinsin handle clear
the brackets and pivot entirehandle
assemblyforward and allow itto reston
mower.
• When settingup your handlefrom the
storageposition,the lowerhandle will
requiremanually lockingintothe mowing
position.
IMPORTANT: When folding the handlefor
storageor transportationbe suretofoldthe
handle as shown or you may damage the
controlcables.
14
Operator presence
control bar
Upper handle
Uft up
Uftup
Mowing
Lower position
handle
J
ENGINE
FUELSYSTEM
IMPORTANT: Itisimportantto preventgum
depositsfrom forming in essentialfuel system
partssuchas carburetor,fuel filter, fuel hose,
or tank duringstorage.Also, experience
intimatesthat alcoholblended fuels (called
gasoholor using ethanolor methanol) can
attractmoisturewhich leads to separationand
formaUon ofacids duringstorage. Acidicgas
can damage thefuel system of an engine
while in storage.
• Drain the fuel tank.
• Startthe engine and let it run untilthe fuel
linesand carburetor are empty.
• Never use engine or carburetor cleaner
productsin the fuel tank or permanent
damage may occur.
• Use fresh fuel nextseason.
NOTE: Fuel stabilizerisan acceptable
altemative in minimizingthe formation offuel
gum depositsduringstorage. Add stabilizerto
gasolineinfuel tank orstorage container.
Alwaysfollow the mk ratiofound on stabilizer
container. Run engineat least 10 minutes
after addingstabilizerto allowthe stabir_.erto
reach the carburetor. Do notdrain the gas
tank and carburetorifusing fuel stabilizer.
ENGINE OIL
Drain oil(withenginewaml) andreplace
clean engine oil. (See "ENGINE" inlhe
Maintenance sectionof thisl_"--tahU.i_._
CYMNDER
• Removesparkplug.
• Pour one ounce (29 mi) ofoilthrough spark
plug hole intocylinder.
• Pull starterhandleslowlya few times to
dL_tn]_Jteoil.
• Replace with new spark plug.
BATTERY
Disconnect the battery from the engine
connector and charge battery 48 hours.
OTHER
• Do not store gasolinefrom one season to-----
another.
• Replaceyourgasolinecan ifyourcan starts
torust Rustand/ordirtinyourgasolinewiU
cause problems.
• Ifpossible,storeyourunitindoorsand cover
ittogiveprotectionfromdustand dirL
• Cover yourunitwitha suitableprotective
coverthatdoes not retainmoisture.Do not
use plastic.Plasticcannotbreathewhich
allowscondensationtoformand wiUcause
your unit to rust.
IMPORTANT: Never covermower while
engine and exhaust areas are stillwarm.
CAUTION: Never store the lawn mower
with gasoline in the tank inside a building
where fumes may reach an open flame or
spark. Allow the engine to cool before
storing in any enclosure.
15
PROBLEM
TROUBLE SHOOTING
CAUSE
Will not start
Loss of power
Poor cut - unever
Excessive vibra-
tion
Starter rope hard
to pull
• Dirty air filter.
• Out of fuel.
• Stale fuel.
• Water in fuel.
• Spark plug wire is dis-.
connected
• Bad spark plug.
• Loose blade or broken
blade adapter.
• Control bar in released
position
• Control bar defective
• Weak battery
• Disconnected battery
connector.
• Rear of lawn mower
housing/blade dragging in
heavy grass.
• Cutting too much grass.
• Dirty air filter.
• Buildup of grass, leaves
and trash under mower.
• Too much oil in engine.
• Walking speed too fast.
• Wom, bent or loose blade.
• Wheel heights uneven.
• Buildup of grass, leaves,
and trash under mower.
• Wom, bent or loose blade.
• Bent engine crankshaft.
• Engine flywheel brake is
on when control bar is
released.
• Bent engine crankshaft
• Blade adapter broken.
• Blade dragging in grass.
CORRECTION
• Clean/replaceair filter.
• Fill fuel tank.
• Drain tank and refill with fresh
clean fuel.
• Drain fuel tank and carburetor
and refill tank with fresh gaso-
line.
• Connect wire to plug.
• Replace spark plug.
• "13ghten'bladeboltor replace
blade adaPter.
• Depress'i:ontrolbar to handle.
• Replace control bar.
• Charge battery.
• Connect battery to engine.
• Set in =Higher Cut" position.
• Set in =Higher Cut" position.
• Clean/replace air filter.
• Clean underside of mower
housing.
,, Check oil level.
• Cut at slower walking speed.
• Replace blade. Tighten blade
bolt.
• Set all wheels at same height.
• Clean underside of mower
housing.
• Replace blade. Tighten blade
bolt.
• Contact an authorized service
center/department.
• Depress control bar to upper
handle before pulling starter
rope.
• Contact an authorized service
center/department.
• Replace blade adapter.
• Move lawn mower to cut grass
or to hard surface to start _
engine.
16 _
TROUBLE SHOOTING
;)ROBLEM CAUSE CORRECTION
Loss of drive
(Self-Propelled
Mowing)
Grass catcher
not filling (If so
equipped)
Hard to push
• Drive wheels not turning
with drive control engaged.
• Belt not driving.
• Cutting height too low.
• Lift on blade worn off.
• Catcher not venting air.
• Grass is too high or wheel
height is too low.
• Rear of lawn mower
housing/blade dragging
in grass.
• Grass catcher too full.
• Handle height position not.
right for you.
• Adjust or replace drive control
cable, if broken.
• Put belt on pulleys or replace
belts if broken.
• Raise cutting height.
• Replace blade.
• Clean grass catcher.
• Raise cutting height.
• Raise rear of lawn mower
housing one (1)
setting higher.
• Empty grass catcher.
• Adjust handle height to suit.
17
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ROTARY LAWN MOWER - - MODEL NO. 917.377631 .
BATTERY
3
I
I
I
I
I
KEY
NO.
1
2
3
4
5
PART
NO.
161334
750909
17411312
86353
111549X
DESCRIPTION
BatteryBox
Battery
Hex WasherHead Screw
13x.750
ConnectorMountingClip
BatteryCharger
38
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CRAFTSMAN 4-CYCLE ENGINE
MODEL NUMBER 143.986718
9O0
157
153_
_223 185
_370A
224 207
3OO
292
29O
238 250
4O
_RAFTSMAN 4-CYCLE ENGINE MODEL NUMBER 143.986718
KEY PART
NO. NO. DESCRIPTION
KEY PART
NO. NO. DESCRIPTIOI_': _
1 36835A
2 26727
6 33734
7 36557
12 32447
12A 36558
12B
14
15
16
17
18
19
2O
30
40
41
42
43
45
46
48
50
52
69
70
36694
28277
30589
34839A
31335
651018
36281
32600
35801
35544A
35545A
35546
35541
35542
35543
35547A
35548A
35549
20381
32875A
32610A
35616
37011
29914
35261
36995
72 30572
73 28833
75 27897
80 30574A
81 30590A
82 30591
83 30588A
86 650488
89 611004
90 611044
92 650815
93 650816
100 34443B
101 610118
103 651007
110 37047
110A 36953
110B 36954
119 36738
120 36721
125 36471
36472
126 29314B
29315C
130 650912
130A650999
135 34645
150 31672
151 31673
153 36649
154 650913
Cylinder (Incl. 2 & 20) 155 35624A
Dowel Pin 157 650914
Breather Element 158 36629
Breather Ass'y. (Incl. 6 & 12A) 159 35626
Breather Tube 160 35627
Breather Cover & Tube 161 30063
(Incl.12B) 178 29752
Breather Tube Elbow 182 30088A
Washer 184 26756
Governor Rod (Incl. 14) 185 36579
Governor Lever 186 32653
Governor Lever Clamp 187 36580
Screw, Torx T-15, 8-32 x 19/64" 189 650831
Extension Spdng 191 36559
Oil Seal 195 610973
Crankshaft 196 35035
Piston, Pin &'Ring Set (Std.) 207 34336
Piston, Pin & Ring Set (.010"OS) 216 33086
Piston, Pin & Ring Set (.020"OS) 223 651044
Piston & Pin Ass'y. (Std.) 223A 651043
Piston & Pin Ass'y. (.010" OS) 224 36581
(Incl. 43) 238 650932
Piston & Pin Ass'y. (.020" OS) 239 34338
(Incl. 43) 241 36919
Ring Set (Std.) 245 36905
Ring Set (.010" OS) 250 36920
Ring Set (.020" OS) 260 37180
Piston Pin Retaining Ring 261 30063
Connecting Rod Ass'y. (Incl. 46) 262 650831
Connecting Rod Bolt 263A 37184
Valve Lifter 275 36950
Camshaft (MCR) 276 36949
Oil Pump Ass'y. 277 651039
Mounting Flange Gasket 285 35000A
Mounting Flange 287 650926
(Incl. 72 thru 83) 290 29774
Oil Drain Plug (Incl. 73) 292 26460
Drain Plug Gasket 298 28763
Oil Seal 300 36916
Governor Shaft 301 36246
Washer 305 35647
Governor Gear Ass'y. (Incl. 81) 306 36996
Governor Spool 307 35499
Screw, 1/4-20 x 1-1/4" 309 650562
Flywheel Key 310 35648
Flywheel 313 34080
Belleville Washer 314 650767
Flywheel Nut 315 36952
Solid State Ignition 322 35013
Spark Plug Cover 322A 610885
Screw, Ton(T-15,10-24 x 15/16" 325 35249
Ground Wire 325A 37152
Ground Wire 325B 29443
D.C. Starter Wire 341A 36578
Cylinder Head Gasket 347 651038
Cylinder Head 370A 36261
Exhaust Valve (Std.) (Incl. 151) 370C 37199
Exhaust Valve (1/32" OS) 380 640160
(Incl. 151) 390 590739
Intake Valve (Std.) (Incl. 151) 395 35709
Intake Valve (1/32" OS) 400 36806B
(Incl. 151) 900
Screw, 5/16-18 x 1-1/2" 900
Screw, 5/16-18 x 2-41/64" from 71-999
Resistor Spark Plug (RN4C)
Valve Spdng
Valve Spring Cap
Push Rod Guide
Rocker Arm Stud
Rocker Arm
Lock Nut
Push Rod
Rocker Arm Cover Gasket
Rocker Arm Housing
Screw, Torx T-30, 1/4-20 x 1/2"
Nut & Lock Washer, 114-28
Screw, 1/4-28 x 1"
Carburetor Gasket
Intake Pipe
Governor Link
Spacer
Screw, 1/4-20 x 1/2"
S.E, Brake Ass'y. (Incl. 195)
Terminal
Power Restart Switch ....
Thlottie Unk
R.P.M. Adjusting Lever
Screw, 1/4-20 x 2-25/32"
Screw, 1/4-20 x 1-31/64"
Intake Pipe Gasket
Screw, 10-32 x 49/64"
Air Cleaner Gasket
Air Cleaner Collar
Air Cleaner Filter
Air Cleaner Cover
Blower Housing
Screw, Torx T-30, 1/4-20 x 1/2"
Screw, 1/4-20 x 1/2"
Starter Grill
Muffler (Incl. 276 & 277)
Locking Plate
Screw, 1/4-20 x 2-47/64"
Starter Cup
Screw, 8-32 x 21/64"
Fuel Line
Fuel Une Clamp
Screw, 10-32 x 35/64"
Fuel Tank (Incl. 292 & 301)
Fuel Cap
Oil Fill Tube
_O'-Ring
"O"-Ring
Screw, 10-32 x 1/2"
Dipstick
Spacer ....
Screw, 8-32 x 27/64"
Alternator Coil
Connector Body
Connector Body
Spring Clip
Spring Clip
Spring Clip
Blower Housing Support Bracket
Screw, 10-32 x 27132"
Lubrication Decal
Pdmer Decal
Carburetor (IncL 184)
Rewind Starter
Electric Starter Motor (12 Volt)
Gasket Set (Incl. Items Marked *)
Replacement Engine NONE
Replacement S/B 750834, order
RPM High 3000 to 3300
NOTE: This engine could have been_uilt
with 590702 starter.
41
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