Homelite UT10517/18 User Manual Page 1

OPERATOR’S MANUALUT10517 / 18 in. 42cc Chain SawUT10518 / 18 in. 46cc Chain SawUT10520 / 20 in. 46cc Chain SawSAVE THIS MANUAL FOR FUTURE REFERENCEYou

Page 10 WARNING:Do not allow familiarity with this product to make you careless. Remember that a careless fraction of a second is sufficient to inflic

Page 11 FUEL AND REFUELINGHANDLING THE FUEL SAFELYWARNING:Check for fuel leaks. If any are found, correct them before using the saw to prevent fire or

Page 12 RUN POSITION FILLING THE FUEL TANKSee Figure 2.Clean the surface around the fuel cap to prevent con-tamination.Loosen the fuel cap slowly

Page 13 RUN POSITION STARTER GRIPOPERATIONSTARTING THE ENGINESee Figures 6 - 11.Starting the product differs depending on whether the engine is cold

Page 14 BRAKE POSITIONOPERATIONPull starter grip until engine runs. NOTE: Allow the saw to run in this position 15-30 sec-onds, depending upon th

Page 15 ADJUSTING IDLE SPEEDSee Figure 15.If the engine starts, runs, and accelerates, but will not idle, turn the idle speed screw “T” clockwise to

Page 16 OPERATIONKICKBACK PRECAUTIONSSee Figures 17 - 18.Rotational kickback occurs when the moving chain contacts an object at the Kickback Danger Zo

Page 17 Fig. 20Fig. 21OPERATIONPROPER CUTTING STANCESee Figure 20.Balance your weight with both feet on solid ground.Keep left arm with elbow loc

Page 18 OPERATIONFELLING TREESHAZARDOUS CONDITIONSWARNING:Do not fell trees during periods of high wind or heavy precipitation. Wait until the ha

Page 19 WEDGEFig. 25HORIZONTAL CUTVERTICALCUTLOOSESECTIONFig. 26Fig. 27OPERATION On large diameter trees, stop the back cut before it is deep enough

Page 2  Introduction ...

Page 20 OPERATIONBUCKING WITH A WEDGESee Figure 28.If the wood diameter is large enough for you to insert a soft bucking wedge without touching the ch

Page 21 UNDERBUCKINGSee Figure 31.Begin on the under side of the log with the top of the saw against the log; exert light pressure upward. During unde

Page 22 RUN POSITION WARNING:When servicing, use only identical Homelite replacement parts. Use of any other parts may create a hazard or caus

Page 23 CUTTERSCHAIN ROTATIONCHAIN DRIVE LINKSFig. 41Fig. 39MAINTENANCEFig. 38Fig. 40Lay out the new saw chain in a loop and straighten any kinks. T

Page 24 MAINTENANCEFig. 42Fig. 43Fig. 44Replace the outer guide bar plate ensuring that the bar pin groove is at the bottom with the upper and lower

Page 25 Fig. 48≈ .050 in.Fig. 47Fig. 46Fig. 49MAINTENANCERetension the chain whenever the flats on the drive links hang out of the bar groove. NOT

Page 26 MAINTENANCESHARPENING THE CUTTERSSee Figures 50 - 53.Be careful to file all cutters to the specified angles and to the same length, as fast cu

Page 27 INCORRECTMORE THAN 30° TOP PLATE FILING ANGLELESS THAN 30° Fig. 5430° CORRECTINCORRECTBACKWARD SLOPESIDE PLATE FILING ANGLEFig. 5580° CORRECTH

Page 28 MAINTENANCEMAINTAINING THE GUIDE BARSee Figure 59.CAUTION:Make sure the chain has stopped before you do any work on the saw.Every week of us

Page 29 MAINTENANCECLEANING THE AIR FILTERSee Figures 62 - 64.For access to the air filter and carburetor area, loosen the three screws holding the

Page 3 WARNING:Read and understand all instructions. Failure to follow all instructions listed below, may result in electric shock, fire and/or seriou

Page 30 MAINTENANCEADJUSTING THE CARBURETORSee Figures 65 - 67.Before adjusting the carburetor:Use a brush or compressed air to clean the starter co

Page 31 CLEANING THE ENGINESee Figures 68 - 69.Clean the cylinder fins and flywheel fins with compressed air or a brush periodically. Dangerous overhe

Page 32 INSPECTING/CLEANING THE SPARK ARRESTOR SCREENSee Figure 72.The muffler is equipped with a spark arrestor screen. A faulty spark arrestor scree

Page 33 TROUBLESHOOTINGProblem Possible Cause SolutionEngine will not start. [Make sure ignition switch is in the RUN ( l ) position.]No spark.

Page 34 TROUBLESHOOTINGProblem Possible Cause SolutionBar and chain running hot and smoking.Chain oil tank empty.Chain tension is too tight. Oiler is

Page 35 LIMITED WARRANTY STATEMENTHomelite Consumer Products, Inc., (“Homelite”) warrants to the original retail purchaser that this HOMELITE brand ou

Page 36 WARRANTYTHE FOLLOWING CALIFORNIA AIR RESOURCES BOARD (CARB) STATEMENT ONLY APPLIES TO MODEL NUMBERS REQUIRED TO MEET THE CARB REQUIREMENTS.The

Page 37 EMISSIONS MAINTENANCE SCHEDULE AND WARRANTED PARTS LISTEmissions Parts Inspect Clean Replace Clean Every Replace Before Every Ev

HOMELITE CONSUMER PRODUCTS, INC.1428 Pearman Dairy RoadAnderson, SC 29625Phone 1-800-242-4672www.homelite.com WARNING:The engine exhaust from this p

Page 4 SPECIFIC SAFETY RULESWARNING:The warnings, labels, and instructions found in this sec-tion of the operator’s manual are for your safety. Failur

Page 5 Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper inter-pretation of these symbols w

Page 6 SERVICEServicing requires extreme care and knowledge and should be performed only by a qualified service technician. For service we sug

Page 7 GLOSSARY OF TERMSBuckingThe process of cross cutting a felled tree or log into lengths.Chain BrakeA device used to stop the saw chain

Page 8 PRODUCT SPECIFICATIONSFEATURESBar length: UT10517, UT10518 ....18 in. UT10520 ...

Page 9 FEATURESFig. 1bKNOW YOUR CHAIN SAWSee Figures 1a - 1b.The safe use of this product requires an understanding of the information on the tool an