
User Manual Craftsman 917378644 Lawn Mower
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.
LAWN MOWER PERFORMANCE

LAWN MOWER MAINTENANCE

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 assem- bled at the factory with the exception of those parts left unassembled for shipping purposes. All parts such as nuts, washers, bolts, etc., necessary to complete the as- sembly have been placed in the parts bag. 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.
TO REMOVE LAWN MOWER FROM CARTON
HOW TO SET UPYOUR LAWN MOWER TO UNFOLD HANDLE
IMPORTANT: Unfold handle carefully so as not to pinch or damage control cables.
Your lawn mower handle can be adjusted for your mowing comfort. Refer to "AD-JUST HANDLE" in the Service and Adjust- ments section of this manual.

TO ASSEMBLE GRASS CATCHER
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.

TO INSTALL ATTACHMENTS
Your lawn mower was shipped ready to be used as a mulcher. To convert to bag- ging, see "TO CONVERT MOWER" in the Operation section of this manual.
KNOW YOUR LAWN MOWER
READ THIS OWNER'S MANUAL AND ALL SAFETY RULES BEFORE OPERATING YOUR LAWN MOWER. Compare the illustrations with your lawn mower to familiarize yourself with the location of 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.


IMPORTANT: This lawn mower is shipped WITHOUT OIL OR GASOLINE in the engine.
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 Com- mission. The blade turns when the engine is running.
Operator presence control bar - must be held down to the handle to start the engine. Release to stop the engine.
Starter handle - used for starting engine.
Primer - pumps additional fuel from the carburetor to the cylinder for use when starting a cold engine.
Drive control bar - used to engage power-propelled forward motion of lawn mower.
Throttle control - used for starting the engine and allows you to select either FAST or SLOW engine speed.
The operation of any lawn mowercan result inforeign objects thrown intothe eyes,which can result in severe eye damage. Always wear safety glassesor eye shields while operating your lawn mower or performing any adjustments or repairs. We recommend standard safety glasses or a wide vision safety mask worn over spectacles.
HOW TO USE YOUR LAWN MOWER ENGINE SPEED
The engine speed is controlled by a throttle control located on the side of the upper handle. FAST position is for starting, normal cutting, trimming and better grass bagging. SLOW position is for light cutting, trimming and fuel economy.

ENGINE ZONE CONTROL
CAUTION: Federal regulations require an engine control to be installed on this lawn mower in order to minimize the risk of blade contact injury. Do not under any circumstances attempt to defeat the function of the operator control. The blade turns when the engine is running.
DRIVE CONTROL
NOTE: If after releasing the drive control the mower will not roll backwards, push the mower forward slightly to disengage drive wheels.
DRIVE CONTROL ADJUSTMENT
Over time, the drive control system may become "loose", resulting in decreased speed. There is a thumbscrew on the underside of the drive control housing to increase tension on the drive cable. Proceed as follows:
NOTE: If mower begins to "creep" forward, the drive cable is too tight. Rotate thumb- screw clockwise to loosen drive cable.

TO ADJUST CUTTING HEIGHT
Raise wheels for low cut and lower wheels for high cut, adjust cutting height to suit your requirements. Medium position is best for most lawns.
NOTE: Adjuster is properly positioned when plate tab inserts into hole in lever. Also, 9-position adjusters (if so equipped) allow lever to be positioned between the plate tabs.

TO CONVERT MOWER
Your lawn mower was shipped ready to be used as a mulcher. To convert to bagging:
CAUTION: Do not run your lawn mower without rear door closed, clipping deflector or approved grass catcher in place. Never attempt to operate the lawn mower with the rear door removed or propped open.

TO EMPTY GRASS CATCHER
NOTE: Do not drag the bag when empty- ing; it will cause unnecessary wear.

BEFORE STARTING ENGINE ADD OIL
Your lawnmower is shipped without oil in the engine. For type and grade of oil to use, see "ENGINE" in the Maintenance section of this manual.
CAUTION: DO NOT overfill engine with oil, or it will smoke heavily from the muffler on startup.
IMPORTANT:
ADD GASOLINE
CAUTION: Wipe off any spilled oil or fuel. Do not store, spill or use gasoline near an open flame.
CAUTION: Alcohol blended fuels called gasohol or using ethanol or metha- nol) 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. Empty 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.

TO STOP ENGINE
TO START ENGINE
NOTE: Due to protective coatings on the engine, a small amount of smoke may be present during the initial use of the prod- uct and should be considered normal.
NOTE: Incooler weather it may be necessary to repeat priming steps. In warmer weather over priming may cause flooding and engine will not start. If you do flood engine, wait a few minutes before attempting to start and do not repeat priming steps.
MOWING TIPS
CAUTION: Do not use de-thatcher blade attachments on your mower. Such attachments are hazardous, will damage your mower and could void your warranty.
MULCHING MOWING TIPS
IMPORTANT: For best performance, keep mower housing free of built-up grass and trash. See "CLEANING" in the Mainte- nance section of this manual.


GENERAL RECOMMENDATIONS
The warranty on this lawn mower does not cover items that have been subjected to operator abuse or negligence. To receive full value from the warranty, operator must maintain unit as instructed in this manual. Some adjustments will need to be made periodically to properly maintain your unit.
BEFORE EACH USE
LUBRICATION
LUBRICATION CHART

IMPORTANT: Do not oil or grease plastic wheel bearings. Viscous lubricants will attract dust and dirtthatwill shorten the life of the self-lubricating bearings. If you feel they must be lubricated, use only a dry, powdered graphite type lubricant sparingly.
LAWN MOWER
Always observe safety rules when per- forming any maintenance.
TIRES
DRIVE WHEELS
Check front drive wheels each time before you mow to be sure they move freely. The wheels not turning freely means trash, grass cuttings, etc. are in the drive wheel area and must be cleaned to free drive wheels. If necessary to clean the drive wheels, be sure to clean both front wheels.
NOTE: If after cleaning, the drive wheels do not turn freely, contact a Sears or other qualified service center.
BLADE CARE
For best results, mower blade must be kept sharp. Replace a bent or damaged blade.
TO REMOVE BLADE
TO REPLACE BLADE
IMPORTANT: Blade bolt is heat treated. If bolt needs replacing, replace only with approved bolt shown in the Repair Parts section of this manual.

TO SHARPEN BLADE
NOTE: We do not recommend sharpening the blade - but if you do, be sure the blade is balanced. Care should be taken to keep the blade balanced. An unbalanced blade will cause eventual damage to lawn mower or engine.
GRASS CATCHER
GEAR CASE
ENGINE LUBRICATION
Use only high quality detergent oil rated with API service classification SF-SJ. Select the oil's SAE viscosity grade according to your expected operating temperature.

NOTE: Although multi-viscosity oils (W30, 10W30 etc.) improve starting in cold weather, these multi-viscosity oils will result in increased oil consumption when used above 32°E Check your engine oil level more frequently to avoid possible engine damage from running low on oil. Change the oil after every 25 hours of operation or at least once a year if the lawn mower is not used for 25 hours in one year. Check the crankcase oil level before starting the engine and after each five (5) hours of continuous use. Tighten oil plug securely each time you check the oil level.
TO CHANGE ENGINE OIL
NOTE: Before tipping lawn mower to drain oil, empty fuel tank by running engine until fuel tank is empty.
1. Disconnect spark plug wire from spark plug and place wire where it cannot come in contact with spark plug.
2. Remove engine oil cap; lay aside on a clean surface.
3. Tip lawn mower on its side as shown and drain oil into a suitable container. Rock lawn mower back and forth to re- move any oil trapped inside of engine.

4. Wipe off any spilled oil from lawn mower or side of engine.
5. Slowly pour oil down the oil fill spout, stopping every few ounces to check the oil level with the dipstick.
6. Stop adding oil when you reach the FULL mark on the dipstick. Wait a minute to allow oil to settle.
7. Continue adding small amounts of oil, rechecking the dipstick until oil level settles at FULL. DO NOT overfill, or engine will smoke heavily from the muffler on startup.
8. Always be sure to retighten oil dipstick before starting engine.
9. Reconnect spark plug wire to plug.
AIR FILTER
Your engine will not run properly using a dirty air filter. Clean the foam pre-cleaner after every 25 hours of operation or every season. Replace paper cartridge every hours of operation or every season, whichever occurs first. Service air cleaner more often under dusty conditions.

MUFFLER
Inspect and replace corroded muffler as it could create a fire hazard and/or damage.
SPARK PLUG
Replace spark plug at the beginning of each mowing season or after every 100 hours of operation, whichever occurs first. Spark plug type and gap setting are shown in the "PRODUCT SPECIFIC ATIONS" section of this manual.
CLEANING
IMPORTANT: For best performance, keep mower housing free of built-up grass and trash. Clean the underside of your mower after each use.
CAUTION: Disconnect spark plug wire from spark plug and place wire where it cannot come in contact with spark plug.
CLEAN UNDER DRIVE COVER
Clean under drive cover at least twice a season. Scrape underside of cover with putty knife or similar tool to remove any build-up of trash or grass on underside of drive cover.
WARNING: To avoid serious injury, before performing any service or adjust- ments:
TO ADJUST CUTTING HEIGHT
See "TO ADJUST CUTTING HEIGHT" in the Operation section of this manual.
REAR DEFLECTOR
The rear deflector, attached between the rear wheels of your mower, is provided to minimize the possibility that objects will be thrown out of the rear of the mower into the operator's mowing position. If the deflector becomes damaged, it should be replaced.
TO REMOVE DRIVE BELT
TO REPLACE DRIVE BELT
NOTE: Always use factory approved belt to assure fit and long life.

TO ADJUST HANDLE
The handle can be mounted in a high or low position. The mounting holes in the bottom of lower handle are off center for raising or lowering the handle.

ENGINE SPEED
Your engine speed has been factory set. Do not attempt to increase engine speed or it may result in personal injury. If you believe that the engine is running too fast or too slow, take your lawn mower to a Sears or other qualified service center for repair and adjustment.
CARBURETOR
Your carburetor is not adjustable. If your engine does not operate properly due to suspected carburetor problems, take your lawn mower to a Sears or other qualified service center for repair and/or adjust- ment.
IMPORTANT: Never tamper with the engine governor, which is factory set for proper engine speed. Overspeeding the engine above the factory high speed setting can be dangerous. If you think the engine-governed high speed needs adjusting, contact a Sears or other qualified service center, which has proper equipment and experience to make any necessary adjustments.
Immediately prepare your lawn mower for storage at the end of the season or if the unit will not be used for 30 days or more.
LAWN MOWER
When mower is to be stored for a period of time, clean it thoroughly, remove all dirt, grease, leaves, etc. Store in aclean, dryarea.
HANDLE
You can fold your mower handle for storage.
NOTE: The upper handle has an "anti-fold" bracket located on the right side of the handle. This bracket prevents the upper handle from folding forward, which helps protect control cable(s) from damage.
IMPORTANT: When folding the handle for storage or transportation, be sure to fold the handle as shown or you may damage the control cables.

FUEL SYSTEM
IMPORTANT: It is important to prevent gum deposits from forming in essential fuel system parts such as carburetor, fuel filter, fuel hose, or tank during storage. Also, 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.
NOTE: Fuel stabilizer is an acceptable alternative in minimizing the formation of fuel gum deposits during storage. Add stabilizer to gasoline in fuel tank or stor- age container. Always follow the mix ratio found on stabilizer container. Run engine at least 10 minutes after adding stabilizer to allow the stabilizer to reach the car- buretor. Do not empty the gas tank and carburetor if using fuel stabilizer.
ENGINE OIL
Drain oil (with engine warm) and replace with clean engine oil. (See "ENGINE" in the Maintenance section of this manual).
CYLINDER
OTHER
IMPORTANT: Never cover mower while engine and exhaust areas are still warm.
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 stor- ing in any enclosure.
- See appropriate section in manual unless directed to a Sears Service Center.
1. Dirty air filter.
2. Out of fuel.
3. Stale fuel.
4. Water in fuel.
5. Spark plug wire is disconnected.
6. Bad spark plug.
7. Loose blade or broken blade adapter.
8. Control bar in released position.
9. Control bar defective.
10. Fuel valve lever (if so equipped) in OFF position.
11. Weak battery (if equipped).
12. Disconnected battery connector (if equipped).
1. Rear of mower housing or blade dragging in grass.
2. Cutting too much grass.
3. Dirty air filter.
4. Buildup of grass, leaves, and trash under mower
5. Too much oil in engine.
6. Walking speed too fast.
1. Worn, bent or loose blade.
2. Wheel heights uneven.
3. Buildup of grass, leaves and trash under mower.
1. Worn, bent or loose blade.
2. Bent engine crankshaft.
1. Engine flywheel brake is on when control bar is released.
2. Bent engine crankshaft.
3. Blade adapter broken.
4. Blade dragging in grass.