Craftsman 917.77374 owner manual Engine, Lubrication, Muffler

ENGINE

LUBRICATION

Use only high quality detergent oil rated

with API service classification SG-SL.

Select the oil's SAE viscosity grade

according to your expected operating

temperature.

SAE VISCOSITY GRADES

F -20 0 30 32 40 60 80 100

TEMPERATURE RANGE ANTiCiPATED BEFORE NEXT OIL CHANGE

NOTE: Although multi-viscosityoils

(5W30, 10W30 etc.) improve starting in

cold weather, these multi-viscosity oils 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. Change the oil after every 25 hours of operation or at least once a year if the unit 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 trimmer to drain oil, drain 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 trimmer on its side as shown and

drain oil into a suitable container. Rock trimmer back and forth to remove any oil trapped inside of engine.

Container

4.Wipe off any spilled oil from trimmer or side of engine.

5.Fill engine with oil (See "ADD OIL" in the Operation section of this manual).

6.Replace engine oil cap.

7.Reconnect spark plug wire to spark plug.

AIR FILTER

Your engine will not run properly and may be damaged by using a dirty air filter. Replace the air filter cartridge every 100 hours of operation or every season, which- ever occurs first. Service air cleaner more often under dusty conditions.

TO CLEAN AIR FILTER

1.Loosen screw and tilt cover to remove.

2.Carefully remove cartridge.

3.Clean by gently tapping on a flat sur-

face. If very dirty, replace cartridge.

_I, CAUTION: Petroleum solvents, such as kerosene, are not to be used to clean cartridge. They may cause deterioration of the cartridge. Do not oil cartridge. Do not use pressurized air to clean or dry cartridge.

4.Install cartridge, then replace cover making sure the tabs are aligned with the slots in the back plate. Fasten screw securely.

Lip Back plate

/

Cart_

Slot

Cover

tab

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 trimmer free of built-up grass and trash. Clean the underside of your trimmer after

11 each use.