Homelite UT10570 manual

OPERA T OR'S MANU AL UT10560 / 16 in. (406 mm) 38cc Chain Saw UT10550 / 18 in. (457 mm) 45cc Chain Saw UT10570 / 20 in. (508 mm) 45cc Chain Saw Y our new chain sa w has been engineered and manuf actured to Homelite’ s high standard f or dependability , ease of operation, and operator saf ety . Properly cared for , it will giv e you years of [...]

Page 2 ■ ■ ■ ■ ■ Introduction ..................................................................................................................................................................... 2 ■ ■ ■ ■ ■ General Saf ety Rules ....................................................................................................[...]

Page 3 W ARNING: 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. Safe operation of this tool requires that you read and understand this operator's manual and all labels affixed to the tool. Safety is a combi[...]

Page 4 W ARNING: 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 PRECAUTIONS ■ ■ ■ ■ ■ DO NOT CUT VINES and/or small underbrush (less than 3 in./76 mm in diameter). ■ ■ ■ ■ ■ MUFFLER S[...]

Page 5 PUSH AND PULL See Figure 1. The reaction f orce is always opposite to the direction the chain is moving. Thus, the oper ator 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. MAINTENANCE PRECAUTIONS Never operate a chain saw that is damaged, improperly adjusted, or is n[...]

Page 6 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 Indicates danger, warning or caution. It means attention!!! Your safety is involved. Your manual contains special mes[...]

Page 7 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[...]

Page 8 FEA TURES STOP Fig. 2 FRONT HAND GUARD/CHAIN BRAKE FRONT HANDLE CYLINDER COVER TRIGGER RELEASE REAR HANDLE THROTTLE TRIGGER IGNITION SWITCH FUEL CAP CHAIN OIL CAP STARTER/FAN HOUSING STARTER GRIP SAFE-T-TIP ® PRIMER BULB CHOKE LEVER BAR MOUNTING NUTS[...]

Page 9 Fig. 3 RUN POSITION BRAKE POSITION Fig. 5 Fig. 4 SAFE-T-TIP ® W ARNING: The warnings and instructions in this section of the operator's manual are for your safety and to prevent serious personal injury. UNDERSTANDING YOUR CHAIN SAW SAFETY DEVICES SAFE-T-TIP ® ANTI-KICKBACK NOSE GUARD See Figure 3. The SAFE-T -TIP ® prev ents kickbac [...]

Page 10 W ARNING: Always shut off engine before fueling. Never add fuel to a machine with a running or hot engine. Move at least 30 ft. (9 m) from refueling site before starting the engine. DO NOT SMOKE! Failure to heed this warning can result in possible personal injury. FUEL AND REFUELING HANDLING THE FUEL SAFELY See Figure 8. W ARNING: Check for[...]

Page 11 ADDING OIL See Figures 9 and 10. Use HOMELITE Bar and Chain Oil. It is designed for chains and chain oilers, and is formulated to perform over a wide temperature range with no dilution required. Chain saw should use approximately one tank of oil per tank of fuel. Note: Do not use dirty, used or otherwise contaminated oils. Damage may occur [...]

Page 12 STARTING THE ENGINE See Figures 13 through 19. W ARNING: Keep your body to the left of the chain line. Never straddle the saw or chain, or lean over past the chain line. 1. Place the chain saw on level ground and ensure that no objects or obstructions are in the immediate vicinity that could come in contact with the bar and chain. 2. Hold t[...]

Page 13 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 lev er all the wa y IN. See Figure 18. 9. Pull the ST AR TER GRIP until engine r[...]

Page 14 PREPARING FOR CUTTING PROPER GRIP ON HANDLES See Figure 22 and 23. Ref er to “Specific Saf ety Rules – Safety Apparel” earlier in this manual for appropriate safety equipment. ■ ■ ■ ■ ■ W ear non-slip gloves f or maximum grip and protection. ■ ■ ■ ■ ■ Hold the saw firmly with both hands. Always k eep your LEFT HAND[...]

Page 15 BASIC OPERATING/CUTTING PROCEDURES Practice cutting a f ew small logs using the f ollowing technique to get the “feel” of using your saw before you begin a major sawing operation. 1. T ake the proper stance in front of the w ood with the saw idling. 2. Accelerate the engine to full throttle just before entering the cut by squeezing the [...]

Page 16 W ARNING: Weather conditions and altitude may affect carburetion. Do not allow bystanders close to the chain saw while adjusting the carburetor. ADJUSTING IDLE SPEED 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. ■ ■ [...]

Page 17 PROPER PROCEDURE FOR TREE FELLING See Figures 30, 31, 32, and 33. 1. Pick your escape route (or routes in case the in- tended route is blocked). Clear the immediate area around the tree and make sure there are no obstruc- tions in your planned path of retreat. Clear the path of safe retreat approximately 135° from the planned line of fall.[...]

Page 18 Note: Never cut through to the notch. Always leave a band of wood between the notch and back cut (approxi- mately 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 shoot- back of the tree off the stump. On large [...]

Page 19 REMOVING BUTTRESS ROOTS See Figure 34. A b uttress root is a large root e xtending 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 pr[...]

Page 20 BUCKING LOGS UNDER STRESS See Figure 37. Make the first b ucking cut 1/3 of the wa y 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 unde[...]

Page 21 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[...]

Page 22 ASSEMBLING THE BAR AND CHAIN See Figures 41 through 51. D ANGER: 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. W ARNING: To avoid serious personal injury, read and understand al[...]

Page 23 6. La y out the saw chain in a loop and straighten an y kinks. The cutters should face in the direction of chain rotation. If the y face bac kwards , 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[...]

Page 24 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. CHAIN TENSIONING SCREW MAINTENANCE Fig. 49 Fig. 50 Fig. 51 15. Lift the tip of the guide bar up to check for sag. 16. Release th[...]

Page 25 ADJUSTING THE CHAIN TENSION See Figures 52, 53, and 54 . W ARNING: 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 fing[...]

Page 26 CUTTING CORNER SIDE PLATE DEPTH GAUGE TOE GULLET HEEL RIVET HOLE TOP PLATE Fig. 57 ■ 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 Se[...]

Page 27 Fig. 59 Fig. 60 LEFT HAND CUTTERS RIGHT HAND CUTTERS Fig. 61 CA UTION: A dull or improperly sharpened chain can cause excessive engine speed during cutting which may result in severe engine damage. W ARNING: Improper chain sharpening increases the potential of kickback. W ARNING: Failure to replace or repair a damaged chain can cause seriou[...]

Page 28 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 80 o – Produced automatically if you use the[...]

Page 29 Fig. 66 MAINTAINING THE GUIDE BAR See Figure 67. CA UTION: Make sure the chain has stopped before you do any work on the saw. Every week of use, reverse the guide bar on the saw to distribute the wear for maximum bar life. The bar should be cleaned ev er y day of use and chec ked f or wear and damage. F eather ing or burring of the bar rail[...]

Page 30 CA UTION: Never run the engine without the air filter, serious damage could result. Make sure the air filter is correctly placed in the air filter cover before reassembly. ■ 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-filte[...]

Page 31 CLEANING THE ENGINE See Figures 74 and 75. Clean the cylinder fins and flywheel fins with compressed air or a brush periodically. Dangerous overheating of the engine may occur due to impurities on the cylinder. W ARNING Never run the saw without all the parts, including the drivecase cover and starter housing, securely in place. Because par[...]

Page 32 CLEANING THE SPARK ARRESTING MUFFLER 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. Alwa ys keep the muffler and spark arrestor on your sa w in good condition. [...]

Page 33 PROBLEM POSSIBLE CAUSE SOLUTION Engine will not start. (Make sure Ignition Switch is in start position “I”.) Engine starts but will not accelerate properly. Engine starts but will not run properly at high speed . Engine does not reach full speed and/or emits excessive smoke. 1. No spark. 2. Flooded engine. Carburetor requires “ L ” [...]

Page 34 PROBLEM POSSIBLE CAUSE SOLUTION Engine starts, runs, and accelerates but will not idle. Chain turns at idle. Bar and chain running hot and smoking. Engine starts and runs, but chain is not rotating. Carburetor requires adjustment. Carburetor requires adjustment. 1. Chain oil tank empty. 2. Chain tension is too tight. 3. Oiler is not functio[...]

Page 35 W ARRANTY CALIFORNIA EMISSION CONTROL LIMITED W ARRANTY ST A TEMENT Y OUR W ARRANTY RIGHTS AND OBLIGA TIONS HOMELITE CONSUMER PR ODUCTS, INC. The U .S. En vironmental Protection Agency (EP A), the Calif ornia Air Resources Board (CARB), and Homelite Consumer Products, Inc. are pleased to e xplain the Emission Control System W arranty on y o[...]

HOMELITE CONSUMER PRODUCTS, INC. 1428 Pearman Dairy Road, Anderson, SC 29625 Post Office Box 1207, Anderson, SC 29622 Phone 1-800-chainsaw (1-800-242-4672) www.homelite.com OPERA T OR'S MANU AL UT10560 / 16 in. (406 mm) 38cc Chain Saw UT10550 / 18 in. (457 mm) 45cc Chain Saw UT10570 / 20 in. (508 mm) 45cc Chain Saw For product information, tec[...]