OPERATOR'S MANUAL UT10927D / 16 in. (406 mm) 38cc Chain Saw UT10946D / 18 in. (457 mm) 45cc Chain Saw UT10942D / 20 in. (508 mm) 45cc Chain Saw Your new chain saw has been engineered and manufactured to Homelite’s high standard for dependability, ease of operation, and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance. WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using this product.
TABLE OF CONTENTS ■ Introduction ..................................................................................................................................................................... 2 ■ General Safety Rules .................................................................................................................................................. 3-4 ■ Specific Safety Rules .................................................................................................................
GENERAL SAFETY RULES ■ DO NOT OPERATE A CHAIN SAW WITH ONE HAND. Serious injury to the operator, helpers, bystanders, or any combination of these persons may result from one-handed operation. A chain saw is intended for two-handed use. WARNING: The warnings, labels, and instructions found in this section of the operator's manual are for your safety. Failure to follow all instructions may result in serious personal injury.
GENERAL SAFETY RULES ■ ALL CHAIN SAW SERVICE, other than the items listed in the instruction manual and all maintenance, should be performed by competent chain saw service personnel. (For example, if improper tools are used to remove the flywheel or if an improper tool is used to hold the flywheel in order to remove the clutch, structural damage to the flywheel could occur and subsequently could cause the flywheel to burst.
SPECIFIC SAFETY RULES PUSH AND PULL MAINTENANCE PRECAUTIONS See Figure 1. The reaction force is always opposite to the direction the chain is moving. Thus, the operator must be ready to control the PULL when cutting on the bottom edge of the bar and the PUSH when cutting along the top edge. Never operate a chain saw that is damaged, improperly adjusted, or is not completely and securely assembled. Be sure that the saw chain stops moving when the throttle control trigger is released.
SYMBOLS Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer. SYMBOL NAME EXPLANATION Safety Alert Symbol Indicates danger, warning or caution. It means attention!!! Your safety is involved.
SYMBOLS The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and the explanations with them, deserve your careful attention and understanding. The safety warnings do not by themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper accident prevention measures. Symbol Meaning DANGER: Indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury.
FEATURES TRIGGER RELEASE CHAIN OIL CAP FRONT HAND GUARD/CHAIN BRAKE FRONT HANDLE SAFE-T-TIP® CYLINDER COVER BAR MOUNTING NUTS CHOKE LEVER PRIMER BULB STARTER GRIP STARTER/FAN HOUSING REAR HANDLE STOP IGNITION SWITCH Page 8 FUEL MIX CAP THROTTLE TRIGGER Fig.
OPERATION pushed toward the bar, the chain should stop immediately. A chain brake does not prevent kickback. The chain brake should be cleaned and tested before each use. Refer to “Operation- Operating the Chain Brake” later in this manual for additional information. WARNING: The warnings and instructions in this section of the operator's manual are for your safety and to prevent serious personal injury.
OPERATION KICKBACK PRECAUTIONS See Figures 6 and 7. Rotational kickback occurs when the moving chain contacts an object at the Kickback Danger Zone of the guide bar. The result is a lightning fast, reverse reaction which kicks the guide bar up and back towards the operator. This reaction can cause loss of control which can result in serious injury. KICKBACK DANGER ZONE Fig. 6 ROTATIONAL KICKBACK ■ Keep gasoline and oil away from the eyes.
OPERATION OPERATING THE CHAIN BRAKE STOP Fig. 8 See Figures 10, 11 and 12. Refer to “Safety” earlier in this manual for additional information. Check the operating condition of the chain brake prior to each use. 1. Using the back of your left hand, engage the chain brake by pushing the chain brake lever/hand guard toward the bar while the chain is rotating rapidly. 2.
OPERATION 3. Set the Ignition Switch to the RUN (I) position. 4. Make sure the chain brake is in the RUN position by pulling back on the lever / hand guard. See Figure 15. 5. Fully press and release the PRIMER BULB 7 times. 6. Pull CHOKE lever all the way OUT to full position. The partial throttle position is automatically set when the choke lever is set at full choke. STARTING THE ENGINE See Figures 13 through 19. WARNING: Keep your body to the left of the chain line.
OPERATION Now you are ready to pick up the saw. Use the proper grip for both handles, refer to “Operation” for additional information. STOPPING THE ENGINE CHOKE LEVER Fig. 18 7. When the temperature is above 50° F, pull the STARTER GRIP until the engine attempts to start, but no more than 3 times. When the temperature is below 50° F, pull the STARTER GRIP until the engine attempts to start, but no more than 5 times. 8. Push CHOKE lever all the way IN. See Figure 18. 9.
OPERATION PREPARING FOR CUTTING PROPER GRIP ON HANDLES See Figure 22 and 23. Refer to “Specific Safety Rules – Safety Apparel” earlier in this manual for appropriate safety equipment. ■ Wear non-slip gloves for maximum grip and protection. ■ Hold the saw firmly with both hands. Always keep your LEFT HAND on the front handle and your RIGHT HAND on the rear handle so that your body is to the left of the chain line.
OPERATION BASIC OPERATING/CUTTING PROCEDURES Practice cutting a few small logs using the following technique to get the “feel” of using your saw before you begin a major sawing operation. 1. Take the proper stance in front of the wood with the saw idling. 2. Accelerate the engine to full throttle just before entering the cut by squeezing the throttle trigger. 3. Begin cutting with the saw against the log. 4. Keep the engine at full throttle the entire time you are cutting. 5.
OPERATION ADJUSTING IDLE SPEED FELLING TREES See Figure 28. ■ If the engine starts, runs, and accelerates but will not idle, turn the idle speed screw “ T ” clockwise to increase idle speed. ■ If the chain turns at idle, turn the idle speed screw “ T ” counterclockwise to reduce the idle RPM and stop the chain movement. If the saw chain still moves at idle speed, contact a Homelite Service Center for adjustment and discontinue use until the repair is made.
OPERATION PROPER PROCEDURE FOR TREE FELLING See Figures 30, 31, 32, and 33. 1. Pick your escape route (or routes in case the intended route is blocked). Clear the immediate area around the tree and make sure there are no obstructions in your planned path of retreat. Clear the path of safe retreat approximately 135° from the planned line of fall. 2. Consider the force and direction of the wind, the lean and balance of the tree, and the location of large limbs.
OPERATION Note: Never cut through to the notch. Always leave a band of wood between the notch and back cut (approximately 2 inches (5 cm) or 1/10 the diameter of the tree). This is called "hinge" or "hingewood". It controls the fall of the tree and prevents slipping or twisting or shootback of the tree off the stump. On large diameter trees, stop the back cut before it is deep enough for the tree to either fall or settle back on the stump.
OPERATION REMOVING BUTTRESS ROOTS See Figure 34. A buttress root is a large root extending from the trunk of the tree above the ground. Remove large buttress roots prior to felling. Make the horizontal cut into the buttress first, followed by the vertical cut. Remove the resulting loose section from the work area. Follow the correct tree felling procedure after you have removed the large buttress roots. Refer to “Operation – Proper Procedure for Tree Felling” earlier in this manual.
OPERATION BUCKING LOGS UNDER STRESS See Figure 37. Make the first bucking cut 1/3 of the way through the log and finish with a 2/3 cut on the opposite side. As you cut the log, it will tend to bend. The saw can become pinched or hung in the log if you make the first cut deeper than 1/3 of the diameter of the log. Give special attention to logs under stress to prevent the bar and chain from pinching. LOG SUPPORTED AT ONE END FINISHING CUT LOAD OVERBUCKING See Figure 38.
OPERATION LIMBING AND PRUNING See Figure 39. ■ Work slowly, keeping both hands on the saw with a firm grip. Maintain secure footing and balance. ■ Keep the tree between you and the chain while limbing. ■ Do not cut from a ladder, this is extremely dangerous. Leave this operation for professionals. ■ Do not cut above chest height as a saw held higher is difficult to control against kickback. LOAD SECOND CUT FIRST CUT 1/3 DIAMETER WARNING: FINISHING CUT Never climb into a tree to limb or prune.
MAINTENANCE ASSEMBLING THE BAR AND CHAIN See Figures 41 through 51. DANGER: Never start the engine before installing the guide bar, chain, drivecase cover, and clutch drum. Without all these parts in place, the clutch can fly off or explode exposing the user to possible serious injury. COMBINATION WRENCH WARNING: To avoid serious personal injury, read and understand all the safety instructions in this section. BAR MOUNTING NUTS Fig. 42 1.
MAINTENANCE 6. Lay out the saw chain in a loop and straighten any kinks. The cutters should face in the direction of chain rotation. If they face backwards, turn the loop over. 7. Place the chain drive links into the bar groove as shown in figure 46. 8. Position the chain so there is a loop at the back of the bar. 9. Hold the chain in position on the bar and place the loop around the sprocket. 10. Fit the bar flush against the mounting surface so that the bar studs are in the long slot of the bar.
MAINTENANCE 14. Remove all slack from the chain using the chain tensioning screw. Place a slotted screwdriver in the slot and turn clockwise until the chain seats snugly against the bar with the drive links in the bar groove. UT10942D CHAIN TENSIONING SCREW 15. Lift the tip of the guide bar up to check for sag. 16. Release the tip of the guide bar and turn the chain tensioning screw 1/2 turn clockwise. Repeat this process until sag does not exist. 17.
MAINTENANCE ADJUSTING THE CHAIN TENSION See Figures 52, 53, and 54. WARNING: Never touch or adjust the chain while the motor is running. The saw chain is very sharp. Always wear protective gloves when performing maintenance on the chain. ≈ 1. Stop the engine before setting the chain tension. 2. Make sure the guide bar mounting nuts are loosened to finger tight, turn the chain tensioner clockwise to tension the chain.
MAINTENANCE ■ Raker (depth gauge) clearance. 1. Too low increases the potential for kickback. 2. Not low enough decreases cutting ability. ■ If the cutter teeth hit hard objects such as nails and stones, or are abraded by mud or sand on the wood, have the Homelite Service Center sharpen the chain. Note: Inspect the drive sprocket for wear or damage when replacing the chain. If signs of wear or damage are present in the areas indicated, have the drive sprocket replaced by a Homelite Service Center.
MAINTENANCE LEFT HAND CUTTERS RIGHT HAND CUTTERS Fig. 59 Fig. 61 CAUTION: A dull or improperly sharpened chain can cause excessive engine speed during cutting which may result in severe engine damage. WARNING: Fig. 60 Improper chain sharpening increases the potential of kickback. WARNING: Failure to replace or repair a damaged chain can cause serious injury. WARNING: The saw chain is very sharp. Always wear protective gloves when performing maintenance to the chain.
MAINTENANCE TOP PLATE FILING ANGLE See Figure 62. ■ CORRECT 30° - file holders are marked with guide marks to align file properly to produce correct top plate angle. ■ LESS THAN 30° – for cross cutting. ■ MORE THAN 30° – feathered edge dulls quickly. SIDE PLATE ANGLE See Figure 63. ■ CORRECT 80o – Produced automatically if you use the correct diameter file in the file holder. ■ HOOK – “Grabs” and dulls quickly, increases the potential of KICKBACK.
MAINTENANCE MAINTAINING THE SAFE-T-TIP® NOSE GUARD See Figures 68 and 69. RESTORE ORIGINAL SHAPE BY ROUNDING THE FRONT CAUTION: Make sure the chain has stopped before you do any work on the saw. Fig. 66 WARNING: MAINTAINING THE GUIDE BAR Although the guide bar comes with a SAFE-T-TIP® anti-kickback device already installed, you need to check the tightness of the mounting screw before each use. See Figure 67. CAUTION: Make sure the chain has stopped before you do any work on the saw.
MAINTENANCE ■ Clean the pre-filter every 25 tanks of fuel or sooner, if required. Remove the cylinder cover, starter assembly and the fan housing baffle for access to the pre-filter in the engine housing. Note: If you use an air hose for drying, blow through both sides of filter. TIGHTEN 3/4 OF A TURN CAUTION: Fig. 69 MOUNTING THE SAFE-T-TIP® NOSE GUARD See Figures 68 and 69. 1. Mount the SAFE-T-TIP® on the bar nose. 2. Fit the locking rivet or tab in the recessed hole in the guide bar. 3.
MAINTENANCE CLEANING THE STARTER UNIT See Figure 73. Use a brush or compressed air to keep the cooling vents of the starter assembly free and clean of debris. CLEAN FLYWHEEL FINS Fig. 75 P STO CHECKING THE FUEL FILTER Fig. 73 See Figure 76. Check the fuel filter periodically. Replace it if contaminated or damaged. CLEANING THE ENGINE See Figures 74 and 75. Clean the cylinder fins and flywheel fins with compressed air or a brush periodically.
MAINTENANCE CLEANING THE SPARK ARRESTING MUFFLER CHAIN CATCHER See Figure 78. The muffler is equipped with a spark arrestor screen. A faulty spark arrestor screen can create a fire hazard. Through normal use the screen can become dirty and should be inspected weekly and cleaned as required. Always keep the muffler and spark arrestor on your saw in good condition. CLUTCH COVER WARNING Muffler surfaces are very hot during and after operation of the chain saw, keep all body parts away from the muffler.
BAR AND CHAIN COMBINATIONS UT10927D - UT10946D Length of Bar Guide Bar Part Number Chain Part Number 16 in. PS06132 PS06136 18 in. PS06131 PS06135 Length of Bar Guide Bar Part Number Chain Part Number 20 in. PS06301 PS06134 UT10942D TROUBLESHOOTING PROBLEM Engine will not start. (Make sure Ignition Switch is in start position “I”.) POSSIBLE CAUSE SOLUTION 1. Check spark. Remove air filter cover. Remove spark plug from cylinder.
TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION Engine starts, runs, and accelerates but will not idle. Carburetor requires adjustment. Turn idle speed screw “T” clockwise to increase idle speed. See Figure 81. Chain turns at idle. Carburetor requires adjustment. Turn idle speed screw “T” counterclockwise to decrease speed. See Figure 81. 1. Chain oil tank empty. 1. Oil tank should be filled every time that fuel tank is filled. 2.
WARRANTY LIMITED WARRANTY STATEMENT Homelite Consumer Product, Inc. warrants to the original retail purchaser that this HOMELITE product is free from defect in material and workmanship and agrees to repair or replace, at Homelite Consumer Products, Inc.’s discretion, any defective product free of charge within these time periods from the date of purchase.
OPERATOR'S MANUAL UT10927D / 16 in. (406 mm) 38cc Chain Saw UT10946D / 18 in. (457 mm) 45cc Chain Saw UT10942D / 20 in. (508 mm) 45cc Chain Saw WARNING: The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. CALIFORNIA PROPOSITION 65 For product information, technical help, dealer locations or parts ordering information visit our website at: www.homelite.com. HOMELITE CONSUMER PRODUCTS, INC.
