Assessments - 3, GPA: 4
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5. Sprocket Check for cracks and for excessive wear interfering with the chain drive. If the wear is considerable, replace it with new one. Never fit a new chain on a worn sprocket, or a worn chain on a new sprocket. 6. Way of the cooling air WARNING • The engine metal parts can burn your skin. Never touch the cylinder, muffler or ignition plug etc. during operation or right after stopping the engine. • Before starting the engine, check around the muffler and take off sawdust. If you do not, it will cause the overheating and a fire. For preventing the trouble, please keep clean around the muffler. This engine is air-cooled. Dust clogging between the inlet port of the cooling air and cylinder fins will cause overheating of the engine. Periodically check and clean the cylinder fins after removing the air cleaner and the cylinder cover. Fuel filter IMPORTANT inlet port of the cooling air When installing the cylinder cover, make sure that switch wires (b) Wash the filter with gasoline. and grommets are positioned correctly in place. Replace with new one if clogged with dirt completely. GB-15 G2500 / G2500 OPS 7. Muffler WARNING If you do not attach the muffler correctly, after engine starts, the muffler will be loosen and the hightemperature exhaust gas spout. After cleaning the muffler, pay attention to fit up the muffler according to the explanation as follows. 1. Muffler body, muffler cover and baffle will be combined correctly. 2. Be sure the gasket is not broken. If it is broken, change to WARNING the new one. Don't pull the starter when detaching it from the unit. 3. Before tightening the screw, rub the gross on it. 4. After making a test run, re-tighten the screw (TORQUE: 6.9-7.8 N.m./70-80 kg-cm) Right after stopping the engine, do not touch the muffler with one's bare hands. It will cause to burn your hands. If carbon clogs between the muffler, it will cause the poor-output and the trouble in starting. After each 100 hours, check and clean inside the muffler. 8. Maintenance of Saw Chain and Guide Bar ¦ Saw Chain Place the file on the cutter and push straight forward. Keep the file position as illustrated. WARNING It is very important for smooth and safe operation to always keep the cutters sharp. WARNING WARNING Be sure to wear safety gloves. Before filing: • Make sure the saw chain is held securely. •Make sure the engine is stopped. • Use a round file of proper size for the chain. Chain type: 91VG / 25AP File size: 5/32 in (4.0 mm) GB-16 8. Recoil Starter • For recoil maintenance, when attaching or detaching the starter of One-push-start model, the select lever should be in the position of the rear side (G2500 One-push-start only). • Don't pull the starter when detaching it from the unit. It will cause machine defect or serious injury by touching rotating parts on your body part carelessly. Select lever Set direction The cutters need to be sharpened when: • Sawdust becomes powder-like. •You need extra force to saw in. • The cut path does not go straight. •Vibration increases. • Fuel consumption increases. Cutter setting standards: After each cutter has been filed, check the depth gauge and file it to the proper level as illustrated. Appropriate gauge checker Make the shoulder round .025. (0.64 mm) Depth gauge standard WARNING Be sure to round off the front edge to reduce the chance of kickback or tie-strap breakage. Make sure every cutter has the same length and edge angles as illustrated. Cutter length Filing angle Side plate angle Top plate cutting angle ¦ Guide Bar • Reverse the bar occasionally to prevent partial wear. • The bar rail should always be square. Check for wear of the bar rail. Apply a ruler to the bar and the out 9. Troubleshooting Guide G2500 / G2500 OPS side of a cutter. If a gap is observed between them, the rail is normal. Otherwise, the bar rail is worn. Such a bar needs to be corrected or replaced. Ruler G B WARNING: This saw is equipped with one of the following low kickback bar/chain combinations: Zenoah Part Number Bar Size Guide Bar Saw Chain Drum 10 2475-52110 2475-52210 2475-51110 10 2475-52120 3622-52210 2841-51110 Gap No gap Chain tilts Case 1. Starting failure WARNING Make sure the icing prevention system is not work ing. Check fuel for water or substandard mix-a Replace with proper fuel. ture. d Remove and dry the Check for engine spark plug. flooding. a Then pull the starter again with no choke. d Check spark ignition. a Replace with a new plug. 10. Disposal When disposing your machine, fuel or oil for the machine, be sure to allow your local regulations. Case 2. Lack of power/Poor acceleration/ Rough idling Check fuel for water or substandard mix-a Replace with proper fuel. ture. d Check air filter and fuel filter for clog-a Clean. ging. d Check carburetor for inadequate adjustment. a Readjust speed needles. Case 3. Oil does not come out Check oil for sub- Replace. a standard quality. d Check oil passage Clean. and ports for clog-a ging. If the unit seems to need fur...
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