RedMax G621AVS manual

OWNER / OPERA T OR MANUAL CHAINSA WS 3369-93110 (506) The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. W ARNING Before using our products, please read this manual carefully to understand the proper use of your unit. W ARNING APPLICABLE SERIAL NUMBERS [...]

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 This mark indicates i[...]

2. Specifications ■ G621AVS Power unit : Displacement ···················································································· 3.78(62.0) cu-in(cm 3 ) Fuel ················································[...]

 4  3. Symbols on the machine Made in Japan RedMax IMPORT ANT ENGINE INFORMA TION THIS ENGINE CONFORMS T O US EP A PH1 FOR SMALL OFF-RO AD ENGINES. ENGINE F AMIL Y : 5KZXS. 0625MN:EM ENGINE DISPLACEMENT : 62cc REFER T O OWNER'S MANUMAL FOR MAINTE- NANCE SPECIFICA TIONS AND ADJUSTMENTS. MANUF ACTURED : INFORMA TION IMPORT ANTE CONCERNANT [...]

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 a[...]

 6  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. 18. Guard against kickback. Kickback is the upward motion of the guide b[...]

The saw chain has very sharp edges. Use thick protective gloves for safety. 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 lowe[...]

 8  6. Fuel and Chain oil ■ RECOMMENDED MIXING RATIO GASOLINE 50:OIL 1 • Exhaust emission are controlled by the fundamental engine parameters and components(eq., carburation, ignition timing and port timing) without addition of any major hardware or the introduction of an inert material during combustion. • These engines are certified t[...]

6. Fuel and Chain oil  9  ■ CHAIN OIL Use motor oil SAE 10W-30 all year round, or SAE 30-40 in summer and SAE 20 in winter. Do not use waste or regenerated oil that can cause damage to the oil pump. NOTE again for at least one minute. As some oils may be difficult to agitate depending on oil ingredients, sufficient agitation is necessary fo[...]

 10  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 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 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 The oil flow can be changed by turnin[...]

 12  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 ■ ICING PREVENTION SYSTEM This system prevents icing of the carburetor which sometimes happen while sawing in wi[...]

7. Operation ■ 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 t[...]

 14  • 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. •A lways 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 ki[...]

■ 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 [...]

 16  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 (F2[...]

9. Maintenance Maintenance, replacement, or repair of the emission control device and systems may be performed by any non-road engine repair establishment or individual. 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 E[...]

 18  9. Maintenance ■ 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 corre[...]

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 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 [...]

 20  ■ SAW CHAIN I t 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: Be sure t[...]

10. Maintenance of Saw Chain and Guide Bar ■ 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 [...]

12. T roubleshooting Guide Case 1. Starting failure: Make sure the icing prevention system is not working. Case 2. Lack of power/Poor acceleration/Rough idling Case 3. Oil does not come out Check fuel for water or substandard mixture. Check for engine flooding. Check the spark. Check fuel for water or substandard mixture. Check air filter and fuel [...]

 23  13. Parts list 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 [...]

 24  Fig.A-1 POWER UNIT (1) 13. Parts list G621A VS[...]

 25  G621A VS Q'TY Key# PART NUMBER DESCRIPTION NOTE /UNIT Fig.A-1 POWER UNIT (1) 2 3356-12141 Grommet 1 3 848-C90-14B3 Gasket 1 4 2618-14120 Insulator 1 5 848-C90-14C2 Gasket 1 6 2616-14211 Gasket 1 7 3310-12281 Bolt 4 8 848-C90-2104 Crankcase assy 1 9 848-C90-2112 • Crankcase comp. 1 10 04065-03515 • Snap ring 1 11 T4012-21240 • [...]

 26  G621A VS Fig.A-2 POWER UNIT (2)[...]

G621A VS  27  Q'TY Key# PART NUMBER DESCRIPTION NOTE /UNIT Fig.A-2 POWER UNIT (2) 1 3356-24101 Brake band comp. 1 2 3356-24111 • Band 1 3 3356-24120 • Arm 1 4 04025-00408 • Pin 1 5 3356-24140 Roller 1 6 2622-24210 Lever 1 7 848-C92-5431 Stopper 1 8 2622-24600 Spring 1 9 3356-24240 Spring 1 10 0308-00060 Snap ring 2 11 2623-25310 Sp[...]

Q'TY Key# PART NUMBER DESCRIPTION NOTE /UNIT 1 3369-81000 Carburetor assy 1 2 3306-81380 Screen 1 3 3350-81130 Cover 1 4 3350-81140 Cover 1 5 3366-81151 Shaft assy 1 6 3366-81340 Valve 1 7 3356-81171 Shaft assy 1 8 2629-81180 Valve 1 9 1488-81190 Stop 1 10 3356-81310 Valve 1 11 3350-81220 Ball 1 12 3350-81230 Gasket 1 K2 13 3350-81240 Gasket 1[...]

 29  Q'TY Key# PART NUMBER DESCRIPTION NOTE /UNIT K2 3350-06020 Gasket kit 1 OP K3 3350-06030 Diaphragm kit 1 OP K8 2623-06012 Double spike kit 1 OP Q'TY Key# PART NUMBER DESCRIPTION NOTE /UNIT 1 2890-96100 Puller assy 1 OP 2 2616-96210 Wrench 1 OP 3 3350-96220 Stopper 1 OP 4 3350-96240 Gauge 1 OP 5 3350-96510 Guide 1 OP 6 3330-9721[...]

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. EMISSION-RELATED PARTS ARE: THE CARBURETOR[...]

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 [...]

KOMA TSU ZENOAH AMERICA INC. 4344 Shackleford Road Suite 500 Norcross, Georgia 30093 ©P rinted in Japan[...]