RedMax G621AVS User Manual

OWNER/OPERATOR MANUAL

CHAINSAWS

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.

WARNING

Before using our products, please
read this manual carefully to
understand the proper use of your
unit.

WARNING

APPLICABLE SERIAL NUMBERS : 330138 and up

G621AVS

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 instructions which must be
followed in order to prevent accidents which could
lead to serious bodily injury or death.

This mark indicates instructions which must be
followed, or it leads to mechanical failure,
breakdown, or damage.

This mark indicates hints or directions useful in the
use of the product.

NOTE

CONTENTS

1. Parts location …………………………………3

2. Specifications …………………………………3

3. Symbols on the machine ……………………4

4. For safe operation ……………………………5

5. Installing guide bar and saw chain …………7

6. Fuel and chain oil ……………………………8

7. Operation ……………………………………10

8. Sawing ………………………………………14

9. Maintenance …………………………………17

10.

Maintenance of Saw Chain and Guide Bar

………20

11. Storage ………………………………………21

12. Troubleshooting Guide ……………………22

13. Parts list ………………………………………23

WARNING

IMPORTANT

2. Specifications

■ G621AVS

Power unit :

Displacement ···················································································· 3.78(62.0) cu-in(cm3)
Fuel ············································································· Mixture(Gasoline 50 : 2-cycle oil 1)
Fuel tank capacity ················································································· 22.4(0.67) fl.oz( )
Chain oil ························································································ Motor oil SAE #10W-30
Oil tank capacity ···················································································· 11.8(0.35) fl.oz( )
Carburetor ········································································· Diaphragm type (Walbro HDA)
lgnition system ··································································································· Solid-state
Spark plug ······························································································· Champion CJ-7Y
Oil feeding system ··········································································· Variable delivery type
Sprocket : Pitch – No. of teeth ··························································· 3/8in(9.53mm) – 7T
Dimensions : L – W – H ········································ 17.3(433)x10.2(255)x11.4(285) in(mm)
Dry weight ································································································ 11.9(5.3) lbs(kg)

Cutting attachment :

Guide bar : Type – Size ······················································· 18(45), 20(50), 24(60) in(cm)
Saw chain : Type – Pitch – Gauge ·······················

Oregon 72V – 3/8(9.53) – 0.050(1.27) in(mm)

Specifications are subject to change without notice.

1. Parts location

 3 

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

 4 

3. Symbols on the machine

Made in Japan

RedMax

IMPORTANT ENGINE INFORMATION

THIS ENGINE CONFORMS TO US EPA
PH1 FOR SMALL OFF-ROAD ENGINES.

ENGINE FAMILY : 5KZXS. 0625MN:EM
ENGINE DISPLACEMENT : 62cc

REFER TO OWNER'S MANUMAL FOR MAINTE­NANCE SPECIFICATIONS AND ADJUSTMENTS.

MANUFACTURED :

INFORMATION IMPORTANTE CONCERNANT LE MOTEUR

Ce moteur conformc aux normcs U.S. EPA
PH1 pour les petits moteurs tout-terrain.

Type de moteur :

5KZXS. 0625MN:EM

Cylindrée du moteur : 62cc

Se référer au Manuel de l'utilisateur pour les
spécifications d'entretien et les réglages.

Made in Japan

RedMax

Manufacturé :

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). Starting the engine, if you pull out the choke knob (at the back-

right of the rear handle) to the point of the arrow, you can set the
starting mode as follows

• First-stage position – starting mode when the engine is warm.

• Second-stage position – starting mode when the engine is cool.

Position: Upper-right of the aircleaner cover

(e). The screw under the "H" stamp is The High-speed adjustment

screw.
The screw under the "L" stamp is The Slow-speed adjustment
screw.
The screw at the left of the "T" stamp is the Idle adjustment
screw.

Position: Left side of the rear handle

(f). It shows the directions that the chain brake is released (for the

white arrow) and activated (for the black arrow).

Position: Front of the chain cover

WARNING

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.

3a) Eliminate all sources of sparks or

flame (ie. smoking, open flames, or
work that can cause sparks) in the
areas where fuel is mixed, poured, or
stored.

3b) Do not smoke while handling fuel or

while operating the chain saw.

4. Do not allow other persons to be near
the chain saw when starting the engine
or cutting a wood. Keep bystanders and
animals out of the work area. Children,
pets, and bystanders should be a
minimum of thirty(30) feet away when
you start or operate the chain saw.

5. Never start cutting until you have a clear
work area, secure footing, and planned
retreat path from the falling tree.

6. Always hold the chain saw firmly with
both hands when the engine is running.
Use a firm grip with thumb and fingers
encircling the chain saw handles.

7. Keep all parts of your body away from
the saw chain when the engine is
running.

8. Before you start the engine, make sure
the saw chain is not contacting anything.

9. Always carry the chain saw with the
engine stopped, the guide bar and saw
chain to the rear, and the muffler away
from your body.

10. Always inspect the chain saw before
each use for worn, Ioose, or changed
parts. Never operate a chain saw that is
damaged, improperly adjusted, or is not
completely and securely assembled. Be
sure that the saw chain stops moving
when the throttle control trigger is
released.

11. All chain saw service, other than the
items listed in the Operator’s Manual,
should be performed by competent chain
saw service personnel. (e.g., if improper
tools are used to remove the flywheel, or
if an improper tool is used to hold the
flywheel in order to remove the clutch,
structural damage to the flywheel could
occur which could subsequently cause
the flywheel to disintegrate).

12. Always shut off the engine before setting
it down.

13. 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.

14. When cutting a limb that is under
tension, be alert for spring back so that
you will not be struck when the tension in
the wood fibers is released.

15. Keep the handles dry, clean and free of
oil or fuel mixture.

 5 

 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 bar which
occurs when the saw chain at the nose
of the guide bar contacts an object.
Kickback can lead to dangerous loss of
control of the chain saw.

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.

KICKBACK SAFETY PRECAUTIONS FOR

CHAIN SAW USERS

● Kickback may occur when the nose or tip of the guide bar touches an object, or when the
wood closes in and pinches the saw chain in the cut. Tip contact in some cases may
cause a lightning fast reverse reaction, kicking the guide bar up and back towards the
operator. Pinching the saw chain along the top of the guide bar may push the guide bar
rapidly back towards the operator. Either of these reactions may cause you to lose
control of the saw which could result in serious personal injury.

● Do not rely exclusively on the safety devices built into your saw. As a chain saw user you
should take several steps to keep cutting jobs free from accident or injury.

(1) With a basic understanding of kickback you can reduce or eliminate the element of

surprise. Sudden surprise contributes to accidents.

(2) Keep a good grip on the saw with both hands, the right hand on the rear handle, and

the left hand on the front handle, when the engine is running. Use a firm grip with
thumbs and fingers encircling the chain saw handles. A firm grip will help you reduce
kickback and maintain control of the saw. Don’t let go.

(3) Make certain that the area in which you’re cutting is free from obstructions. Do not let

the nose of the guide bar contact a log, branch, or any other obstruction which could

be hit while you are operating the saw.
(4) Cut at high engine speeds.
(5) Do not overreach or cut above shoulder height.
(6) Follow manufacturers sharpening and maintenance instructions for saw chain.
(7) Only use replacement bars and chains specified by the manufacturer or the

equivalent.

WARNING

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 lower hole of the
guide bar. (F1)

(1) Chain cover
(2) Chain tensioner nut

Pay attention to the correct direction of the saw
chain. (F2)

(1) Moving Direction

4. Fit the chain cover to the power unit and fasten
the nuts to finger tightness.

5. While holding up the tip of the bar, adjust the
chain tension by turning the tensioner screw until
the tie straps just touch the bottom side of the
bar rail.

6. Tighten the nuts securely with the bar tip held up
(12~15 N·m). Then check the chain for smooth
rotation and proper tension while moving it by
hand. If necessary, readjust with the chain cover
loose.

7. Tighten the tensioner screw. (F3)

(1) Loosen
(2) Tighten

A new chain will expand its length in the beginning
of use. Check and readjust the tension frequently
as a loose chain can easily derail or cause rapid
wear of itseif and the guide bar.

NOTE

5. Installing guide bar and saw chain

F1

F2

F3

 7 

WARNING

NOTE

 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 to operate on
unleaded gasoline.

• Make sure to use gasoline with a
minimum octane number of 89 RON
(USA/Canada: 87AL)

• If you use a gasoline of a lower octane
value than prescribed, there is a danger
that the engine temperature may rise and
an engine problem such as piston seizing
may consequently occur.

• Unleaded gasoline is recommended to
reduce the contamination of the air for the
sake of your health and the environment.

• Poor quality gasolines or oils may damage
sealing rings, fuel lines or fuel tank of the
engine.

■ HOW TO MIX FUEL

Pay attention to agitation.

1. Measure out the quantities of gasoline
and oil to be mixed.

2. Put some of the gasoline into a clean,
approved fuel container.

3. Pour in all of the oil and agitate well.

4. Pour In the rest of gasoline and agitate

IMPORTANT

• 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. If RedMax oil is not
available, use an anti-oxidant added
quality oil expressly labeled for air-cooled
2-cycle engine use. (JASO FC GRADE
OIL or ISO EGC GRADE)

• Do not use BIA or TCW (2-stroke water­cooling type) mixed oil.

WARNING

50:1 MIXING CHART

GASOLINE gal. 1 2345

2-CYCLE OIL fl.oz 2.6 5.2 7.8 10.4 13

GASOLINE liter 1 2345

2-CYCLE OIL ml 20 40 60 80 100

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 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.

■ FUELING THE UNIT

1. Untwist and remove the fuel cap. Rest the
cap on a dustless place.

2. Put fuel into the fuel tank to 80% of the full
capacity.

3. Fasten the fuel cap securely and wipe up
any fuel spillage around the unit.

1. Select bare ground for fueling.

2. Move at least 10feet (3meters) away from
the fueling point before starting the
engine.

3. Stop the engine before refueling the unit.
At that time, be sure to sufficiently agitate
the mixed gasoline in the container.

FOR YOUR ENGINE LIFE, AVOID;

1. FUEL WITH NO OIL(RAW GASOLINE) –
It will cause severe damage to the internal
engine parts very quickly.

2. GASOHOL – It can cause deterioration of
rubber and/or plastic parts and disruption
of engine lubrication.

3. OIL FOR 4-CYCLE ENGINE USE – It can
cause spark plug fouling, exhaust port
blocking, or piston ring sticking.

4. Mixed fuels which have been left

unused for a period of one month or
more may clog the carburetor and result

in the engine failing to operate properly.

5. In the case of storing the product for a

WARNING

long period of time, clean the fuel tank
after rendering it empty. Next, activate the
engine and empty the carburetor of the
composite fuel.

6. In the case of scrapping the used mixed
oil container, scrap it only at an authorized
repository site.

As lot details of quality assurance, read the
description in the section Limited Warranty
carefully. Moreover, normal wear and
change in product with no functional
influence are not covered by the warranty.
Also, be careful that, if the usage in the
instruction manual is not observed as to the
mixed gasoline, etc. described therein, it
may not be covered by the warranty.

NOTE

 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. While holding the throttle lever together with the
throttle interlock, push in the side latch and
release the throttle lever to hold it at the starting
position. (F8)

4. Pull out the choke knob to the closed position.
(F9)

(1) Chain oil (2) Fuel
(3) Switch (4) Throttle lever
(5) Throttle interlock (6) Latch
(7) Choke knob

When restarting immediately after stopping the
engine, leave the choke knob at the open position.

5. While holding the saw unit securely on the
ground, pull the starter rope vigorously. (F10)

Do not start the engine while hanging the chain
saw with a hand. The saw chain may touch
your body. It's very dangerous.

6. When engine has ignited first, push in the choke
knob and pull the starter again to start the
engine.

7. Allow the engine to warm up with the throttle
lever pulled slightly.

Keep clear of the saw chain as it will start
rotatIng upon starting of engine.

WARNING

7. Operation

F6

F7

F8

F9

F10

WARNING

NOTE

WARNING