Assessments - 4, GPA: 4
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WARNING: Improper chain sharpening increases the potential of kickback. WARNING: Failure to replace or repair a damaged chain can cause serious injury. MAINTENANCE CUTTING CORNER SIDE PLATE TOP PLATE DEPTH GAUGE RIVET HOLE HEEL TOE GULLET Fig. 49 Fig. 50 Fig. 51 LEFT HAND CUTTERS RIGHT HAND CUTTERS Fig. 52 TOP PLATE FILING ANGLE See Figure 53. n CORRECT 30° – file holders are marked with guide marks to align file properly to produce correct top plate angle. n LESS THAN 30° – for cross cutting. n MORE THAN 30° – feathered edge dulls quickly. SIDE PLATE ANGLE See Figure 54. n CORRECT 80° – Produced automatically if you use the correct diameter file in the file holder. n HOOK – “Grabs” and dulls quickly; increases the potential of KICKBACK. Results from using a file with a diameter too small or a file held too low. n BACKWARD SLOPE – Needs too much feed pressure; causes excessive wear to the bar and chain. Results from using a file with a diameter too large or file held too high. MAINTAINING DEPTH GAUGE CLEARANCE See Figure 55 - 57. n Maintain the depth gauge at a clearance of .025 in. Use a depth gauge tool for checking the depth gauge clearances. n Every time the chain is filed, check the depth gauge clearance. ..n Use a flat file and a depth gauge jointer to lower all gauges uniformly. Use a .025 in. depth gauge jointer. After lowering each depth gauge, restore original shape by rounding the front. Be careful not to damage adjoining drive links with the edge of the file. ..n Depth gauges must be adjusted with the flat file in the same direction the adjoining cutter was filed with the round file. Use care not to contact cutter face with flat file when adjusting depth gauges. MAINTENANCE RAKER (DEPTH GAUGE) CLEARANCE TOP PLATE FILING ANGLE .025 in. 30° Fig. 55 DEPTH GAUGE JOINTER CORRECT LESS THAN 30° MORE THAN 30° FLAT FILE Fig. 56 INCORRECT Fig. 53 SIDE PLATE FILING ANGLE RESTORE ORIGINAL SHAPE BY ROUNDING THE FRONT 80° CORRECT Fig. 57 HOOK BACKWARD SLOPE INCORRECT Fig. 54 MAINTAINING THE GUIDE BAR See Figure 58. CAUTION: 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 every day of use and checked for wear and damage. Feathering or burring of the bar rails is a normal process of bar wear. Such faults should be smoothed with a file as soon as they occur. A bar with any of the following faults should be replaced: n Wear inside the bar rails that permits the chain to lay over sideways n Bent guide bar n Cracked or broken rails n Spread rails Lubricate guide bars weekly with a sprocket at their tip. Using a grease syringe, lubricate weekly in the lubricating hole. Turn the guide bar and check that the lubrication holes and chain groove are free from impurities. MOUNTING THE SAFE-T-TIP NOSE GUARD See Figures 59 - 60. n Mount the SAFE-T-TIP on the bar nose. n Fit the locking rivet or tab in the recessed hole in the guide bar. n Tighten the screw with your finger. n From the finger tight position, tighten the screw an additional 3/4 of a turn using a wrench. MAINTAINING THE SAFE-T-TIP NOSE GUARD See Figures 59 - 60. CAUTION: Make sure the chain has stopped before you do any work on the saw. WARNING: Although the guide bar comes with a SAFE-T-TIP antikickback device already installed, check the tightness of the mounting screw before each use. Use the following instructions to tighten the mounting screw of the nose guard. These are specially hardened screws. If you cannot install the screw tightly, replace both the screw and the SAFE-T-TIP before further operation. NOTE: Do not replace the screw with an ordinary screw. Use only identical replacement parts from the manufacturer when replacing parts. In addition to preventing chain contact with solid objects at the nose of the bar, the SAFE-T-TIP also helps keep the chain away from abrasive surfaces, such as the ground. Keep it on the right hand side of the bar where it will be between the chain and the ground during flush with ground cutting. The mounting screw requires a 5/16 in. wrench (or adjustable wrench) to achieve the recommended tightness of 35 to 45 in.lb. A tightness within this range can be achieved by using the following method. n Tighten the screw with your fingers. n Tighten screw an additional 3/4 turn using a wrench. MAINTENANCE LUBRICATING HOLE Fig. 58 MOUNTING SCREW SAFE-T-TIP Fig. 59 TIGHTEN 3/4 OF A TURN Fig. 60 CLEANING THE AIR FILTER See Figures 61 - 63. n For access to the air filter and carburetor area, loosen the three screws holding the cylinder cover. n Activate chain brake. n Lift the front of the cylinder cover past chain brake lever. n Lift the back of the cylinder cover past the handle. n Before removing the air filter from the carburetor, blow or brush as much loose dirt and sawdust from around the carburetor and chamber as possible. NOTE: Make sure to pull the choke rod out to keep the carbureto...
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