Craftsman 917.378920 User Manual
Owner’s Manual
ROTARY LAWN MOWER
6.75 Horsepower
Power-Propelled
21" Multi-Cut
Model No.
917.378920
• Español, p. 19
CAUTION:
Read and follow all
Safety Rules and In struc tions
before operating this equipment
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
Visit our Craftsman website: www.sears.com/craftsman
TABLE OF CONTENTS
Warranty...................................................2
Safe ty Rules ..........................................2-4
Prod uct Spec i fi ca tions .............................. 4
Assembly / Pre-Operation ........................6
Op er a tion.............................................7-11
Maintenance Sched ule...........................12
Maintenance......................................12-15
Ser vice and Ad just ments...................15-16
Stor age..............................................16-17
Trou ble shoot ing .................................17-18
Re pair Parts.......................................36-43
Sears Service .......................... Back Cov er
WARRANTY
LIMITED TWO YEAR WARRANTY ON CRAFTS MAN POWER MOWER
For two years from date of purchase, when this Crafts man Lawn Mower is maintained,
lubricated, and tuned up according to the operating and maintenance in struc tions in the
owner’s manual, Sears will repair free of charge any defect in material or work man ship.
If this Craftsman Lawn Mower is used for commercial or rental purposes, this warranty
applies for only 90 days from the date of purchase.
This Warranty does not cover:
• Expendable items which become worn during normal use, such as rotary mower
blades, blade adapters, belts, air cleaners and spark plug.
• Repairs necessary because of operator abuse or neg li gence, including bent crank shafts and the failure to main tain the equipment according to the instructions con tained in the owner’s manual.
Warranty service is available by re turn ing the Craftsman power mower to the near est Sears
Parts & Repair Center in the United States. This war ran ty ap plies only while this product
is used in the United States.
This Warranty gives you specifi c legal rights, and you may also have other rights which
vary from state to state.
Sears, Roebuck And Co., D/817 WA, Hoffman Estates, IL 60179
SAFETY RULES
IMPORTANT: This cutting machine is capable of amputating hands and feet and throw-
ing objects. Failure to observe the following safety instructions could result in serious
injury or death.
Look for this symbol to point out
im por tant safety precautions. It means
CAU TION!!! BECOME ALERT!!!
YOUR SAFE TY IS INVOLVED.
WARNING: In order to prevent ac ci den tal starting when setting up, trans port ing, ad just ing or making repairs,
always dis con nect spark plug wire and
place wire where it can not come in contact with plug.
WARNING: Engine exhaust, some of its
constituents, and certain vehicle com po nents contain or emit chem i cals known
to the State of Cal i for nia to cause can cer
and birth defects or oth er re pro duc tive
harm.
WARNING: Battery posts, terminals and
related accessories contain lead and lead
compounds, chemicals known to the State
of Cal i for nia to cause can cer and birth
defects or oth er re pro duc tive harm. Wash
hands after handling.
CAUTION: Muffl er and other engine
parts become extremely hot during
operation and remain hot after engine has
stopped. To avoid severe burns on contact,
stay away from these areas.
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I. GENERAL OPERATION
• Read, understand, and follow all
in struc tions on the machine and in the
manual(s) before starting. Be thor ough ly
familiar with the controls and the proper
use of the machine before starting.
• Do not put hands or feet near or under
rotating parts. Keep clear of the dis charge opening at all times.
• Only allow responsible individuals, who
are familiar with the in struc tions, to operate the machine.
• Clear the area of objects such as rocks,
toys, wire, bones, sticks, etc., which
could be picked up and thrown by the
blade.
• Be sure the area is clear of other people
before mowing. Stop ma chine if anyone
enters the area.
• Do not operate the mower when bare-
foot or wearing open sandals. Al ways
wear substantial foot wear.
• Do not pull mower backwards unless
absolutely nec es sary. Always look down
and behind before and while moving
backwards.
• Do not operate the mower without
proper guards, plates, grass catcher or
oth er safety protective devices in place.
• See manufacturer’s instructions for
proper operation and installation of
accessories. Only use accessories approved by the manufacturer.
• Stop the blade(s) when crossing grav el
drives, walks, or roads.
• Stop the engine (motor) whenever you
leave the equip ment, before clean ing the
mower or unclogging the chute.
• Shut the engine (motor) off and wait until
the blade comes to complete stop before
removing grass catcher.
• Mow only in daylight or good artifi cial
light.
• Do not operate the machine while under
the infl uence of alcohol or drugs.
• Never operate machine in wet grass.
Always be sure of your footing: keep a
fi rm hold on the handle and walk; never
run.
• Disengage the self-propelled mech-
a nism or drive clutch on mowers so
equipped before starting the engine
(motor).
• If the equipment should start to vi brate
abnormally, stop the engine (motor) and
check immediately for the cause. Vibration is generally a warning of trouble.
• Always wear safety goggles or safe ty
glasses with side shields when op er at ing
mower.
II. SLOPE OPERATION
Slopes are a major factor related to slip
and fall accidents which can result in
severe injury. All slopes require extra caution. If you feel uneasy on a slope, do not
mow it.
DO:
• Mow across the face of slopes: nev er
up and down. Exercise extreme caution
when changing direction on slopes.
• Remove obstacles such as rocks, tree
limbs, etc.
• Watch for holes, ruts, or bumps. Tall
grass can hide obstacles.
DO NOT:
• Do not trim near drop-offs, ditches or
embankments. The operator could lose
footing or balance.
• Do not trim excessively steep slopes.
• Do not mow on wet grass. Reduced footing could cause slipping.
III. CHILDREN
Tragic accidents can occur if the op er a tor
is not alert to the presence of children.
Children are often attracted to the ma chine
Never
and the mowing activity.
that children will remain where you last
saw them.
• Keep children out of the trimming area
and under the watchful care of an oth er
re spon si ble adult.
• Be alert and turn machine off if chil dren
enter the area.
• Before and while walking back wards,
down
look behind and
• Never allow children to operate the machine.
• Use extra care when approaching blind
corners, shrubs, trees, or other objects
that may obscure vision.
for small chil dren.
assume
IV. SERVICE
• Use extra care in handling gasoline and
other fuels. They are fl ammable and
vapors are explosive.
- Use only an approved container.
- Never remove gas cap or add fuel
with the engine running.
Allow engine to cool before refueling.
Do not smoke.
- Never refuel the machine indoors.
- Never store the machine or fuel
container inside where there is an
open fl ame, such as a water heater.
• Never run a machine inside a closed area.
• Never make adjustments or repairs with
the engine (motor) running. Dis con nect the
spark plug wire, and keep the wire away
from the plug to prevent ac ci den tal starting.
3
• Keep nuts and bolts, especially blade
attachment bolts, tight and keep equipment in good condition.
• Never tamper with safety devices. Check
their proper operation reg u lar ly.
• Keep machine free of grass, leaves, or
other debris build-up. Clean oil or fuel spillage. Allow machine to cool before storing.
• Stop and inspect the equipment if you
strike an object. Repair, if nec es sary,
before restarting.
• Never attempt to make wheel height adjustments while the engine (mo tor) is running.
• Grass catcher components are sub ject
to wear, dam age, and de te ri o ra tion,
which could expose moving parts or
allow objects to be thrown. Frequently
check com po nents and replace with
man u fac tur er’s recommended parts,
when necessary.
• Mower blades are sharp and can cut.
Wrap the blade(s) or wear gloves, and
use extra caution when ser vic ing them.
• Do not change the engine governor setting or overspeed the engine.
PRODUCT SPECIFICATIONS
Serial Number:
Date of Purchase:
Gasoline Capacity / Type: 1.6 Quarts (Unleaded Regular)
Oil Type (API-SF-SJ): SAE 30 (above 32°F); SAE 5W-30 (below 32°F)
Oil Capacity: 20 Ounces
Spark Plug (Gap: .030") Champion RJ19LM or J19LM
Blade Bolt Torque: 35-40 ft. lbs.
• The model and serial numbers will be found on a decal on the rear of the lawn mower
housing. Record both serial number and date of purchase in space provided above.
Repair Protection Agreements
Congratulations on making a smart purchase.
designed and manufactured for years of
dependable operation. But like all products, it may require repair from time to
time. That’s when having a Repair Protection Agreement can save you money and
aggravation.
Your new Craftsman® product is
Purchase a Repair Protection Agreement
now and protect yourself from unexpected
hassle and expense.
Here’s what’s included in the Agreement:
• Expert service by our 12,000 profe-
sional repair specialists.
• Unlimited service and no charge for
parts and labor on all covered repairs.
• Product replacement if your covered
product can’t be fi xed.
• Discount of 10% from regular price of
service and service-related parts not
covered by the agreement; also, 10%
off regular price of preventive maintenance check.
• Fast help by phone – phone support
from a Sears technician on products
requiring in-home repair, plus convenient repair scheduling.
Once you purchase the Agreement, a
simple phone call is all that it takes for you
to schedule service. You can call anytime
day or night, or schedule a service appointment online.
Sears has over 12,000 professional repair
specialists, who have access to over 4.5
million quality parts and accessories.
That’s the kind of professionalism you can
count on to help prolong the life of your
new purchase for years to come. Purchase
your Repair Protection Agreement today!
Some limitations and exclusions apply.
For prices and additional information
call 1-800-827-6655.
Sears Installation Service
For Sears professional installation
appliances, garage door openers, water
heaters, and other major home items, in
the U.S.A. call 1-800-4-MY-HOME®.
of home
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ACCESSORIES
These accessories were available when this lawn mower was produced. They are not
shipped with your mower. They are also available at most Sears retail outlets and
service centers. Some of these accessories may not apply to your lawn mower.
5
ASSEMBLY / PRE-OPERATION
Read these instructions and this manual in
its entirety before you attempt to assemble
or operate your new lawn mower.
IMPORTANT: This lawn mower is shipped
WITHOUT OIL OR GASOLINE in the engine.
Your new lawn mower has been as sem bled at the factory with the exception of those parts left unassembled for
shipping pur pos es. To ensure safe and
proper op er a tion of your lawn mower, all
parts and hard ware you assemble must be
tight ened securely. Use the correct tools
as nec es sary to ensure proper tightness.
All parts such as nuts, wash ers, bolts, etc.,
nec es sary to complete the as sem bly have
been placed in the parts bag.
TO REMOVE LAWN MOWER FROM
CARTON
1. Remove loose parts included with
mower.
2. Cut down two end corners of carton
and lay end panel down fl at.
3. Remove all packing materials except
padding be tween upper and lower
handle and padding holding operator
presence control bar to upper handle.
4. Roll lawn mower out of carton and
check carton thor ough ly for additional
loose parts.
HOW TO SET UP YOUR LAWN
MOW ER
TO UNFOLD HANDLE
IMPORTANT: Unfold handle carefully so
as not to pinch or damage con trol cables.
1. Raise handles until lower handle sec-
tion locks into place in mowing position.
2. Remove protective padding, raise up-
per handle sec tion into place on lower
handle and tighten both handle knobs.
3. Remove handle padding holding
operator pres ence control bar to upper
handle.
Your lawn mower handle can be adjusted
for your mowing comfort. Refer to “AD JUST HANDLE” in the Service and Adjustments section of this manual.
Operator presence
control bar
Upper handle
LIFT
UP
LIFT UP
Mowing
position
Lower handle
TO ASSEMBLE GRASS CATCH ER
1. Put grass catcher frame into grass bag
with rigid part of bag on the bottom.
Make sure the frame handle is outside
of the bag top.
2. Slip vinyl bindings over frame.
NOTE: If vinyl bindings are too stiff, hold
them in warm water for a few minutes. If
bag gets wet, let it dry before using.
Catcher
frame
handle
Vinyl
bindings
Frame
opening
TO INSTALL ATTACHMENTS
Your lawn mower was shipped ready to be
used as a mulcher. To convert mower to
bagging or discharging, see “TO CON VERT MOWER” in the Operation section
of this manual.
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