3369-93110 (506) OWNER / OPERATOR MANUAL CHAINSAWS G621AVS WARNING WARNING The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Before using our products, please read this manual carefully to understand the proper use of your unit.
SAFETY FIRST Instructions contained in warnings within this manual marked with a symbol concern critical points which must be taken into consideration to prevent possible serious bodily injury, and for this reason you are requested to read all such instructions carefully and follow them without fail. ■ WARNINGS IN THE MANUAL WARNING This mark indicates instructions which must be followed in order to prevent accidents which could lead to serious bodily injury or death.
1. Parts location 1. Front guard 2. Starter knob 3. Air cleaner 4. Choke knob 5. Throttle interlock 6. Right handle 7. Throttle lever 8. Latch 9. Engine switch 10. Fuel tank 11. Oil tank 12. Left handle 13. Saw chain 14. Guide Bar 2. Specifications ■ G621AVS Power unit : Displacement ···················································································· 3.78(62.
3. Symbols on the machine WARNING For safe operation and maintenance, symbols are carved in relief on the machine. According to these indications, please be careful not to take a mistake. (a). The port to refuel the "MIX GASOLINE" Position: Fuel cap (b). The port to refuel the chain oil Position: Oil cap (c). Put the switch to the "O" position, immediately the engine stops. Position: Rear-left of the unit (d).
4. For safe operation 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. 2. Use safety footwear, snug fitting clothing and eye, hearing and head protection devices. 3. Always use caution when handling fuel. Wipe up all spills and then move the chain saw at least ten(10) feet(three(3) m) from the fueling point before starting the engine.
4. For safe operation 16. Operate the chain saw only in well ventilated areas. Never start or run the engine inside a closed room or building. Exhaust fumes contain dangerous carbon monoxide. 17. Do not operate a chain saw in a tree unless specially trained to do so. 19. When transporting your chain saw, make sure the appropriate guide bar scabbard is in place. 20. This chain saw is equipped with a spark arrester built-in muffler. Periodically check the arrester to keep it in good order. 18.
5. Installing guide bar and saw chain WARNING The saw chain has very sharp edges. Use thick protective gloves for safety. F1 1. Loosen the nuts and remove the chain cover. (F1) 2. Install the attached spike to the power unit. 3. Fit the saw chain around the guide bar and, while gearing the chain to the sprocket, mount the guide bar to the power unit. Then fit the chain tensioner nut into the lower hole of the guide bar.
6. Fuel and Chain oil 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 3m (10ft) away from the fueling point before starting the engine. • The RedMax engines are lubricated by oil specially formulated for air-cooled 2-cycle gasoline engine use.
6. Fuel and Chain oil again for at least one minute. As some oils may be difficult to agitate depending on oil ingredients, sufficient agitation is necessary for the engine to last long. Be careful that, if the agitation is insufficient, there is an increased danger of early piston seizing due to abnormally lean mixture. 5. Put a clear indication on the outside of the container to avoid mixing up with gasoline or other containers. 6. Indicate the contents on outside of container for easy identification.
7. Operation F6 WARNING 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. F7 F8 ■ STARTING ENGINE 1. Fill fuel and chain oil tanks respectively, and tighten the caps securely. (F6) 2. Put the switch to "I" position. (F7) 3.
7. Operation ■ CHECKING OIL SUPPLY WARNING F11 Make sure to set up the bar and the chain when checking the oil supply. If not, the rotating parts may be exposed. It is very dangerous. After starting the engine, run the chain at medium speed and see if chain oil is scattered off as shown in the figure. (F11) (1) Chain oil F12 The oil flow can be changed by turning the adjuster knob on the top of the cylinder cover. Adjustment according to your work conditions.
7. Operation so that saw chain does not turn. If idling speed is too slow, turn the screw clockwise. 4. Make a test cut adjust the H needle for best cutting power, not for maximum speed. (1) L needle (2) H needle (3) Idle adjusting screw F14 ■ ICING PREVENTION SYSTEM This system prevents icing of the carburetor which sometimes happen while sawing in winter. When your saw is possible to be frozen at the carburetor during operation, use the system as follows: 1.
7. Operation F17 ■ CHAIN BRAKE This machine is equipped with an automatic brake to stop saw chain rotation upon occurrence of kickback while in saw cutting operation. The brake is automatically operated by inertial force which acts on the weight fitted inside the front guard. This brake can also be operated manually with the front guard turned down to the guide bar. To release brake, pull up the front guard toward the front handle till "click" sound is heard.
8. Sawing WARNING • Before proceeding to your job, read "For Safe Operation" section It is recommended to first practice sawing easy logs. This also helps you get accustomed to your unit. • Always follow the safety regulations. The chain saw must only be used for cutting wood. It is forbidden to cut other types of material. Vibrations and kickback vary with different materials and the requirements of the safety regulations would not be respected.
8. Sawing F21 ■ FELLING A TREE (F21) 1. Decide the felling direction considering the wind, lean of the tree, location of heavy branches, ease of job after felling and other factors. 2. While clearing the area around the tree, arrange a good foothold and retreat path. 3. Make a notch cut one-third of the way into the tree on the felling side. 4. Make a felling cut from the opposite side of the notch and at a level slightly higher than the bottom of the notch.
8. Sawing F22 F23 F24 A Log lying on the ground (F22) Saw down halfway, then roll the log over and cut from the opposite side. A Log hanging off the ground (F23) In area A, saw up from the bottom one-third and finish by sawing down from the top. In area B, saw down from the top one-third and finish by sawing up from the bottom. Cutting Limb of Fallen Tree (F24) First check to which side the limb is bent. Then make the initial cut from the bent side and finish by sawing from the opposite side.
9. Maintenance F26 Maintenance, replacement, or repair of the emission control device and systems may be performed by any non-road engine repair establishment or individual. WARNING Before cleaning, inspecting or repairing your 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 Loosen the knob and remove the air cleaner cover. Take off the filter element and brush off attached sawdust.
9. Maintenance F29 ■ PERIODICAL SERVICE POINTS 1. Cylinder fins Dust clogging between the cylinder fins will cause overheating of the engine. Periodically check and clean the cylinder fins after removing the air cleaner and the cylinder cover. When installing the cylinder cover, make sure that switch wires and grommets are positioned correctly in place. (F29) NOTE Be sure to block the air intake hole. F30 2. Fuel filter (a) Using a wire hook, take out the filter from the filler port.
9. Maintenance F32 4. Spark plug (F32) Clean the electrodes with a wire brush and reset the gap to 0.65 mm as necessary. Champion: CJ-7Y or NGK: BPM7A F33 5. Sprocket (F33) Check for cracks and for excesslve wear interfenng with the chain drive. If the wearing is found obviously, replace it with new one. Never fit a new chain on a worn sprocket, or a worn chain on a new sprocket. 6. Spark arrester Remove the front Cover of the muffler and inspect the spark arresting screen.
10. Maintenance of Saw Chain and Guide Bar F34 ■ SAW CHAIN WARNING It is very important for smooth and safe operation to keep the cutters always sharp. Your cutters need to be sharpened when: • Sawdust becomes powder-like. • You need extra force to saw in. • The cut way does not go straight. • Vibration increases. • Fuel consumption increases. Cutter setting standards: WARNING Be sure to wear safety gloves. Before filing: • Make sure the saw chain is held securely. • Make sure the engine is stopped.
10. Maintenance of Saw Chain and Guide Bar F36 ■ GUIDE BAR • Reverse the bar occasionally to prevent partial wear. • The bar rail should always be a square. Check for wear of the bar rail. Apply a ruler to the bar and the outside 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.
12. Troubleshooting Guide Case 1. Starting failure: Make sure the icing prevention system is not working. Check fuel for water or substandard mixture. Replace with proper fuel. ➜ Remove and dry the spark plug. Then pull the starter again with no choke. ➜ Replace with a new plug. ➜ ➜ Check for engine flooding. ➜ Check the spark. Case 2. Lack of power/Poor acceleration/Rough idling Check fuel for water or substandard mixture. Replace with proper fuel. ➜ Clean. ➜ Readjust speed needles.
13. Parts list CHAINSAWS G621AVS NOTE : 1. Use KOMATSU ZENOAH genuine parts as specified in the parts list for repair and/or replacement. 2. KOMATSU ZENOAH does not warrant the machines, which have been damaged by the use of any parts other than those specified by the company. 3. When placing parts orders for repair and/or replacement, check if the model name and the serial number are applicable to those specified in the parts list, then use parts number described in the parts list. 4.
13. Parts list Fig.
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G621AVS Fig.
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G621AVS Fig.B CARBBURETOR Key# PART NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Fig.
G621AVS Fig.D CUTTING HEAD Key# PART NUMBER 1A 180RNDD176 1B 200RNDD176 1C 240RNDD176 2A 72V66X 2B 72V70X 2C 72V81X Fig.
RedMax CHAIN SAWS LIMITED WARRANTY EMISSION-RELATED PARTS, FOR TWO (2) YEARS FROM THE DATE OF ORIGINAL DELIVERY, KOMATSU ZENOAH AMERICA INC. (THE COMPANY), THROUGH ANY RedMax DEALER, WILL REPAIR OR REPLACE, FREE OF CHARGE, FOR THE ORIGINAL AND EACH SUBSEQUENT PURCHASER, ANY PART OR PARTS FOUND TO BE DEFECTIVE IN MATERIAL AND/OR WORKMANSHIP.
RedMax Garantie limitée des tronçonneuses Pièces en rapport avec les émissions de gaz d'échappement : KOMATSU ZENOAH AMERICA INC., par l'intermédiaire de n'importe quel revendeur RedMax, réparera gratuitement ou remplacera gratuitement pour l'acheteur initial et chaque acheteur successif toute(s) pièce(s) se révélant de constitution et/ou de montage défectueux pendant deux (2) ans à compter de la date initiale de livraison d’une unité.
KOMATSU ZENOAH AMERICA INC.