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When cutting on a slope or hillside, always stand uphill. Keep in mind that the wood is heavy and that it will bend and pinch the saw if improperly supported. The trunk will weaken at the point where you make the cut unless the tree is lying on perfectly flat ground or supported as shown. If you make the cut with the tree on the ground, don’t let the saw’s chain dig into the earth; it is harmful for the saw, and you stand a good chance of being struck by flying debris. To cut the trunk, use the bucking and two-cut sequence shown. The first cut should be no deeper than one-third the trunk diameter. DANGER • Kickback is generated when the rotation of the chain is arrested for some reason. The most dangerous effect of this action occurs when the nose of the bar contacts another object, the chain is momentarily stopped and all the energy of the engine throws the bar upwards and backwards towards the operator. • The chain saw industry and government agencies have attempted to prescribe various safety devices, but the best protection is to avoid kickback. • Comply with the safety precautions as listed in this manual and Safety Manual. Uphill position Finish cut First cut Board or flat stones CS-680 20 CHAIN BRAKE OPERATION • Set the lever in the unlocked position before starting to cut. • If the brake is tripped by kickback reaction, the chain will stop immediately. Release the throttle to avoid possible damage to the engine or clutch. • Do not attempt to operate the engine with the brake locked. TESTING THE BRAKE • Start the engine on a solid level surface and run at a fast idle until warm. • Hold the saw firmly by the handles and accelerate the engine to a fast idle. • Slowly operate the chain brake lever while holding the saw firmly on the ground. When the brake lever trips, the chain should stop. Immediately release the throttle trigger. WARNING If the chain does not stop immediately, return the saw to your authorized ECHO dealer for repair. NOTE • For practice, while cutting a small tree, push the lever forward to lock the brake. • Confirm that the brake works properly before each use. • If the chain brake is clogged with wood chips, function of the brake may deteriorate. Always keep the device clean. • Do not increase engine revolution while the chain brake is locked. • Use the chain brake only in starting or in emergencies. • When using throttle latch at starting, keep the chain brake locked. And after starting the engine, unlock the brake immediately. IMPORTANT Do not allow the saw to tip forward in order to avoid damage to the chain. Chain brake function When the lever is pushed forward, chain brake instantly stops the chain. Chain brake unlock When the lever is fully pulled, toward the operator, brake is unlocked. Kickback motion Kickback motion End of the guide bar may be placed at the height of about 35 cm (14 in.). 35 cm (14 in.) Rear handle should be gripped lightly with the right hand. Plug Air cleaner cover Warm weather position Cold weather “storage” position End of the guide bar may be placed at the height of about 35 cm (14 in.). 35 cm (14 in.) Rear handle should be gripped lightly with the right hand. Plug Air cleaner cover Warm weather position Cold weather “storage” position AUTOMATIC CHAIN BRAKE Kickback produced from the tip of the guide bar will trip the automatic chain brake. To make sure that the automatic chain brake operates properly, follow these steps: 1. Stop the engine. 2. Hold the saw with the guide bar approximately 35 cm (14 in.) above a wooden surface. Right hand should hold the rear handle, and left hand should hold the front handle. 3. Release the front handle and drop the end of the guide bar against the wooden surface. 4. The impact should lock the chain brake. IMPORTANT When checking the operation of the automatic chain brake, use a soft surface substance like wood to provide the impact so the chain is not damaged. WINTER OPERATION Use the winter plug to prevent carburetor trouble in winter. • Remove air cleaner cover. Remove plug from warm weather position, and install into cold weather “storage” position. NOTE For operation at normal temperature return the plug to its original place. (5°C, 41°F) It causes over heating of the engine. 21 CS-680 CHAIN AND GUIDE BAR COMBINATION The following combinations are recommended for model CS-680. Guide Bar Saw chain Length mm (in.) ECHO Part No. Pitch mm (in.) Type OREGON Links Double Guard Symmetrical 406 (16) 508 (20) 610 (24) 686 (27) 16D0PD3860 20D0PD3870 24D0PD3881 —————— 16D0PS3860 20D0PS3870 24D0PS3881 27D0PS3893 9.53 (3/8) 9.53 (3/8) 9.53 (3/8) 9.53 (3/8) 72LPX,72V 72LPX,72V 72LPX,72V 72LPX,72V 60 70 81 93 GUIDE BAR Replacement guide bars. The following guide bars may be considered to have equivalent kickback energy. • Sprocket nose guide bars of the same length and nose radius, same pitch and having the same number of teeth. • Hard nose guide bars of the same length and nose radius as a sprocket nose bar. SAW CHAIN CAUTION ...