G2500 848C1293A4 (501) G B OWNER’S MANUAL CHAIN SAWS G2500 GB-1
G2500 EXPLANATION OF SYMBOLS AND SAFETY WARNINGS Read operator's instruction book before operating this machine. Wear head, eye and ear protection. Warning! Danger of kickback. Use the chain saw with two hands. Use appropriate protections for foot-leg and hand-arm. Read, understand and follow all warnings. This saw is for trained tree service operators only.
G2500 G B DECLARATION OF CONFORMITY TO MACHINES DIRECTIVE (Directive 98/37/EC, 89/336/EEC) and to the regulations governing transposition Internal control production MANUFACTURER : KOMATSU ZENOAH No. 9, 1-Chome MINAMIDAI, KAWAGOE City SAITAMA, JAPAN DECLARES THAT THE DESIGN OF THE MACHINE DESCRIBED BELOW: Model Serial no.
G2500 1. For safe operation This chainsaw has been especially designed for tree maintenance and should therefore only be used by trained operators when working on trees. 1. Never operate a chain saw when you are fatigued, ill, or upset, or under the influence of medication that may make you drowsy, or if you are under the influence of alcohol or drugs. 9. Never start cutting until you have a clear work area, secure footing, and a planned retreat path from the falling tree. 10.
G2500 16. Always shut off the engine before setting it down. 17. Use extreme caution when cutting small size brush and saplings because slender material may catch the saw chain and be whipped toward you or pull you off balance. 18. When cutting a limb that is under tension, be alert for springback so that you will not be struck when the tension in the wood fibers is released. 19. Never cut in high wind, bad weather, when visibility is poor or in very high or low temperatures.
G2500 WORKING WITH TREE SERVICE CHAIN-SAWS FROM A ROPE AND HARNESS This chapter sets out working practices to reduce the risk of injury from tree service chainsaws when working at height from a rope and harness. While it may form the basis of guidance and training literature, it should not be regarded as a substitute for formal training. The saw should only be attached to the recommended attachment points on the harness. These may be at mid-point (front or rear) or at the sides.
G2500 G B Gaining a good footing at the working position can be assisted by use of a temporary foot stirrup created from an endless sling.
G2500 2. Explanation of Symbols on the Machine For safe operation and maintenance, symbols are carved in relief on the machine. According to these indications, please be careful not to make any mistake. The port to refuel “MIX GASOLINE” Position: Fuel cap The port to top up chain oil Position: Oil cap Setting the switch to the “O” position, the engine stops immediately. Position: Front at the top of the rear handle Starting the engine.
G2500 3. Installing Guide Bar and Saw Chain A standard saw unit package contains the items as illustrated. Power unit Bar protector G B Plug wrench Guide bar Saw chain Screwdriver for carburetor adjustment Open the box and install the guide bar and the saw chain on the power unit as follows: 5. Fit the chain tensioner nut into the lower hole of the guide bar, then install the chain cover, and fasten the mounting nut to finger tightness. The saw chain has very sharp edges.
G2500 4. Fuel and Chain Oil ■ FUEL WARNING • Gasoline is very flammable. Avoid smoking or bringing any flame or sparks near fuel. Make sure to stop the engine and allow it cool before refueling the unit. Select outdoor bare ground for fueling and move at least 3 m (10 ft) away from the fueling point before starting the engine. • The Komatsu Zenoah engines are lubricated by oil specially formulated for air-cooled 2-cycle gasoline engine use.
G2500 5. Operating the Engine It is very dangerous to run a chainsaw that mounts broken parts or lacks any parts. Before starting engine, make sure that all the parts including bar and chain are installed properly. ■ STARTING THE ENGINE 1. Fill fuel and chain oil tanks respectively, and tighten the caps securely. 6. When engine has ignited, first push in the choke knob to the first-stage position and then pull the starter again to start the engine. 7.
G2500 1. H and L needles are restricted within the number of turn as shown below. H needle : -1/4 L needle : -1/4 2. Start the engine and allow it to warm up in low speed for a few minutes. 3. Turn the idle adjusting screw (T) counterclockwise so that the saw chain does not turn. If the idling speed is too slow, turn the screw clockwise. 4. Make a test cut and adjust the H needle for best cutting power, not for maximum speed.
G2500 • • This saw is equipped with a chain brake that will stop the chain in the event of kickback if operating properly. You must check the chain brake operation before each usage by running the saw at full the throttle for I 2 seconds and pushing the front hand guard forward. The chain should stop immediately with the engine at full speed. If the chain is slow to stop or does not stop, replace the brake band and clutch drum before use.
G2500 7. Maintenance Before cleaning, the inspecting or repairing the unit, make sure that engine has stopped and is cool. Disconnect the spark plug to prevent accidental starting. ■ MAINTENANCE AFTER EACH USE 1. Air filter 2. Fuel filter (a) Using a wire hook, take out the filter from the filler port. Fuel filter Loosen the knob and remove the air cleaner cover. Take off the filter elements and tap off attached sawdust. When they are extremely dirty, shakewash with gasoline.
G2500 6. Way of the cooling air • 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. 7.
G2500 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. 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.
G2500 10. Specifications Power unit: Displacement (cm3): ............................................. 25.4 Fuel: ................ Mixture (Gasoline 50 : Two-cycle oil 1) Fuel tank capacity (cm3): ....................................... 230 Chain oil: ................................. Motor oil SAE# 10W-30 Oil tank capacity (cm3): .......................................... 160 Carburetor: ......................................... Diaphragm type lgnition system:: ..........................................
