RedMax EB4401 Owner's manual

The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
WARNING
OWNER/OPERATOR MANUAL
BACKPACK BLOWER
848L3A93A0 (309)
EB4401
Thank you for purchasing a RedMax
product.
Before using our blower, please read
this manual carefully to understand the
proper use of your unit.
310001 and up
APPLICABLE SERIAL NUMBERS :

Read this manual carefully to understand all
safety precautions, controls, proper operation
and maintenance of your RedMax blower.
Failure to do so could result in serious injury.
Instructions labeled as shown at left, concern critical steps or
procedures which must be followed in order to prevent accidents
which could lead to serious bodily injury or death.This mark is
used to indicate instructions which must be followed without
exception.
Instructions labeled as shown at left concern steps or procedures
which, if not followed correctly, could lead to mechanical failure,
breakdown, or damage.
Used to label supplementary instructions designed to provide
hints or directions useful in the use of the product.
WARNING
IMPORTANT
NOTE
SAFETY FIRST
Instructions contained in warnings within this manual and warning seals marked
with a symbol on the blower 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.
Note that there may be times when warning seals peel off or become soiled and
impossible to read. If this happens, you should contact the dealer from which
you purchased the product to order new seals and affix the new seal(s) in the
required location(s).
■ Notes on types of warnings

CONTENTS
SAFETY PRECAUTIONS·······························································4
OPERATOR
USE OF BLOWER
FUEL
WORKING CONDITION
AVOID NOISE PROBLEM
AVOID CHANCES OF DAMAGE
WARNING LABELS ON THE MACHINE·······································7
SYMBOLS ON THE MACHINE······················································8
PARTS LOCATION & SPECIFICATIONS······································9
ASSEMBLY ····················································································9
BLOWER TUBE
FUEL·····························································································10
HOW TO MIX FUEL
FUELING THE UNIT
OPERATION·················································································12
CONTROL ARM
STARTING ENGINE
ADJUSTING IDLE SPEED
STOPPING ENGINE
MAINTENANCE ···········································································14
AIR CLEANER
FUEL FILTER
SPARK PLUG
MUFFLER
SPARK ARRESTER
AIR INLET NET
SHOULDER STRAP
STORAGE ····················································································16
PARTS LIST ·················································································17

•Read this Blower Owner/Operator Manual
carefully. Be sure you understand how to
operate this unit properly before you use
it. Failure to do so could result in serious
injury.
•Be sure to keep this manual handy so that
you may refer to it later whenever any
questions arise. Also note that you are
requested to contact the dealer from
whom you purchased the product for
assistance the event that you have any
questions which cannot be answered
herein.
•Always be sure to include this manual
when selling, lending, or otherwise
transferring the ownership of this product.
■OPERATOR
•Refrain from operating the blower if you are
tired, ill, or upset, or if you are under the
influence of alcohol, drugs or medication.
•To reduce the risk of hearing loss
associated with sound level(s), hearing
protection is required.
•Always wear eye protection and foot
protection. Eye protection should meet
the requirements of ANSI Z87.1.
•To reduce the risk of injury associated with
the inhalation of dust, use a face filter mask
in dusty conditions.
•Wear rubber-soled shoes or shoes with
WARNING
Safety Precautions
some other form of anti-slip protection to
help protect you against falling.
•To reduce the risk of injury associated with
objects being drawn into rotating parts, do
not wear loose clothing, scarves, neck
chains, unconfined long hair, and the like.
■USE OF BLOWER
•Each time before starting the engine,
inspect the entire unit to see if every part is
in good order and is securely tightened in
place. If any damage is found in the fuel
line, the exhaust line, or the ignition wiring,
do not use the blower until it has been
repaired.
•Before starting operation, always make
sure to check if any obstacles are left
inside the volute case. The obstacles may
cause damage on fan and volute case and
serious injury.
Check to see if the shock-absorbing rubber
mount has become cracked or otherwise
damaged. Note that failing to replace this
rubber mount when it has become
cracked or damaged may cause the
engine to come loose from its frame
during use, thus resulting in possible
serious bodily injury.
•If cracked, be sure to replace without delay.
WARNING
IMPORTANT
4

•To reduce the risk of injury associated with
contacting rotating parts, stop the engine
before installing or removing attachments.
Do not operate without net in place.
Always disconnect the spark plug before
performing maintenance or accessing
movable parts.
•Do not allow children to use blower. Make
sure that each person you authorize to
operate the blower understands all of the
safety rules in this manual.
•Avoid using any accessory or attachment
other than those bearing the RedMax mark
for use with the blower.
•Drain the fuel from the fuel tank before
transporting or storing the blower.
•When storing the blower, choose a space
indoors free from moisture and out of the
reach of children.
•Examine the blower at intervals for loose
fasteners and rusted or damaged parts.
Use special care around the fuel line, the
muffler, and the ignition wiring.
•All engine service except for those
described in this manual should be
performed by competent service personnel.
Improper service to the blower fan and
muffler could cause a hazardous failure.
WARNING
Safety Precautions
■FUEL
To reduce the risk of fire and burn injury:
•Handle fuel with care. It is highly
flammable.
•Do not smoke while handing fuel.
•Do not refuel a hot engine.
•Do not refuel a running engine.
•Avoid spilling fuel or oil. Always wipe unit
dry before using.
•Move at least 10 ft. (3 meters) away from
the fueling point before starting engine.
•Always store gasoline in a container
approved for flammable liquids.
•Make sure the unit is properly assembled
and in good operating condition.
■WORKING CONDITION
•Check the work area that the blower will be
used in and remove or cover all valuables
that may be damaged by the air blast or
thrown debris.
•To reduce the risk of injury associated with
exhaust fume inhalation, do not operate in
unventilated area. The exhaust gases
contain harmful carbon monoxide.
•Do not allow bystanders in work area.
•Do not point the blower nozzle in the
direction of people or pets.
WARNING
5

•Avoid using the blower where stable footing
and balance are not assured.
•Never to touch the spark plug or plug cord
while the engine is in operation. Doing so
may result in being subjected to an
electrical shock.
•Never to touch the muffler, spark plug, or
other metallic parts of the engine while the
engine is in operation or immediately after
shutting down the engine. These metallic
parts reach high temperatures during
operation and doing so could result in
serious burns.
■AVOID NOISE PROBLEM
Check and follow the local regulations
as to sound level and hours of
operations for blower.
•Operate power equipment only at
reasonable hours-not early in the morning
or late at night when people might be
disturbed. Comply with times listed in local
ordinances.
•To reduce sound levels, limit the number of
pieces of equipment used at any one time.
•Operate power blowers at the lowest
possible throttle speed to do the job.
•Check your equipment before operation,
especially the muffler, air intakes and air
filters.
•Loosen compacted leaves, grass or debris
with a rake or broom beforehand, so that
the lowest possible throttle setting would
get the job done.
•In dusty conditions, slightly dampen
surfaces or use mister attachment when
water is available.
■AVOID CHANCES OF DAMAGE
•Watch out for children, pets, open windows
or freshly washed cars, and blow debris
safely away.
•Use the full blower nozzle extension so the
air stream can work close to the ground.
•After using blowers and other equipment,
CLEAN UP! Dispose of debris in trash
receptacles.
•Always check to be sure that no debris has
been blown onto someone else’s property.
NOTE
6
Safety Precautions

7
(1) Read owner's manual before operating this machine.
(2) Wear head, eye and ear protection.
(3) Handling this machine improperly could result in accidents causing serious injury or
death. Read this manual carefully and practice using the blower until you are fully
acquainted with all operations and have learned to use it correctly.
If warning label peel off or become soiled and impossible to read, you should contact the dealer
from which you purchased the product to order new labels and affix them in the required
location(s).
Never modify your machine.
We won't warrant the machine, if you use the remodeled machine or you don't observe
the proper usage written in the manual.
WARNING
IMPORTANT
Warning labels on the machine

8
For safe operation and maintenance, symbols are
carved in relief on the machine. According to these
indications, please be careful not to make a
mistake.
(a) The port to refuel the "MIX GASOLINE"
Position: FUEL TANK CAP
(b) The direction to close the choke
Position: AIR CLEANER COVER
(c) The direction to open the choke
Position: AIR CLEANER COVER
Symbols on the machine
Made in Japan
RedMax
IMPORTANT ENGINE INFORMATION
THIS ENGINE CONFORMS TO US EPA
PH1 AND 1995-1999 CALIFORNIA EMISSION
REGULATIONS FOR ULGE ENGINES.
ENGINE FAMILY : WKZXS. 0424ST ; EM
ENGINE DISPLACEMENT : 41.5cc
REFER TO OWNER'S MANUMAL FOR MAINTE-
NANCE SPECIFICATIONS AND ADJUSTMENTS.
MANUFACTURED :
Made in Japan
RedMax
INFORMATION IMPORTANTE
CONCERNANT LE MOTEUR
Ce moteur conformc aux normcs U.S. EPA PH1 et
1995-1999 de la régulementation concernant la
pollution de l'air pour les petits moteurs tout-terrain.
Type de moteur : WKZXS. 0424ST ; EM
Cylindrée du moteur : 41,5cc
Se référer au Manuel de l'utilisateur pour
les spécifications d'entretien et les réglages.
Manufacturé :

MODEL EB4401
Dimensions ( L x W x H ) mm ( in ) 480 x 535 x 495 (189 x 211 x 195)
Dry Weight kg ( lbs ) 8.8 (19.3)
Fuel Tank Capacity liter ( fl. oz ) 2.0 (67.6)
Engine Type Air cooled 2-cycle gasoline engine
Piston Displacement cc ( cu. in ) 41.5 (2.53)
Air Filter Regular size
Carburetor ( Diaphragm ) valve type Rotary
Ignition System C.D.I
Spark Plug Champion RJ6C (Noise-proof)
Muffler Spark arrester equipped
Durability Period hrs 300
Operating Engine Speed rpm 2,000 to 6,500
PIPE END ø57
Fuel Consumption liter/h ( fl. oz/h ) 1.7 (57.5)
Air Volume cu. m/min ( cfm ) 11 (388)
Air Volume (w/o Pipes) cu. m/min ( cfm ) 18 (636)
Air Velocity m/sec ( mph ) 72 (161)
Noise Level dB(A) 72
Parts Location & Specifications
Assembly
■BLOWER TUBES
1.Connect the blower and swivel joint with
flexible hose. Clamp both ends of the
flexible hose securely with the hardware
supplied with the unit.
2.Align the protrusion and the groove
provided on the tube ends and twist the
tube until connection is locked up.
9

Fuel
10 
■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 water-
cooling 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

Fuel
11 
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 fhe
mixed gasoline, etc. described therein, if
may not be covered by the warranty.
NOTE

12 
■CONTROL ARM
1.Hold the upper end of the control arm in
hand and, while pulling it away from the
unit, rotate arm forward (anti-clockwise as
the arrow direction) until it clicks. (The first
position)
And if you want, you can rotate arm more
forward until it clicks. (The second
position)
Choose the arm position according to your
working condition.
To fold the arm, reverse the order.
Operation
■STARTING ENGINE
•Avoid operating the blower with the
flexible tube and swivel joint
disconnected. That will reduce the
cooling air and the engine could be
damaged by overheating.
1.Push the primer bulb until fuel flows out in
the clear tube.
2.When the engine is cool, close the choke.
3.Set the throttle lever in 1/3 open position.
4.To start, hold the top of the blower firmly
with your left hand. Pull the starter knob
slowly until you feel it engage and then
give it a vigorous strong pull.
•Avoid pulling the starter rope out to its
full extent and allowing the starter rope
to snap back. This will prevent
premature damage to the starter.
•Do not let a person stand near the
blower or the exhaust port.
5.Once the engine is running, gradually open
IMPORTANT
IMPORTANT
Full Throttle
About 1/3 Open
Idling

Operation
the choke if it was set closed, and let the
engine run at idle speed for a minute to
warm it up.
•When the engine fails to start after several
attempts due to overchoking, open the
choke and repeat pulling the rope.
■ADJUSTING IDLE SPEED
•The idling speed is set for 2000 rpm at the
factory. If it is necessary to adjust the idle
speed, use the adjustment screw on the
top side of carburetor.
■STOPPING ENGINE
•Move the throttle lever to the idling position
and press the stop switch (red button) until
the engine comes to a complete stop.
NOTE
Stop Switch
13 

14 
■FUEL FILTER
•A clogged fuel filter may cause poor
acceleration of the engine. Check
periodically to see if the filter is clogged
with dirt. The filter can be taken out of the
fueling port using a small wire hook.
Disconnect the filter assembly from the fuel
pipe and unhook the retainer to
disassemble it. Clean the components with
gasoline.
■SPARK PLUG
•The spark plug may gather carbon deposits
on its firing end with reasonable use.
Remove and inspect the spark plug every
25 hours and clean the electrodes as
necessary with a wire brush. The spark gap
should be adjusted to .025 in (0.6~0.7mm).
•Plug manufacturers recommend replacing
the plug twice a year to avoid unexpected
plug failure in a job.
REPLACEMENT PLUG IS A CHAMPION
RJ6C.
•Note that using any spark plugs other than
those designated may result in the engine
failing to operate properly or in the engine
becoming overheated and damaged.
•To install the spark plug, first turn the plug
until it is finger tight, then tighten it a
quarter turn more with a socket wrench.
IMPORTANT
•Make sure that the engine has stopped
and is cool before performing any
service to the blower. Contact with
rotating blower fan or hot muffler may
result in a personal injury.
■AIR CLEANER
•Never operate the blower without an air
filter or with a deformed or broken filter
element.
•Check the air cleaner every 25 hours
of use or more frequently if used under
dusty conditions. A clogged air filter
may increase fuel consumption while
cutting down the engine power. Never
operate the blower without the air filter
or with a deformed filter element
because unfiltered dusty air will quickly
ruin the engine.
CLEANING AIR FILTER:
1.Remove the air cleaner cover by pulling
the tab on bottom and take out the filter
element.
2.Use neutral detergent and warm water to
clean the filter element. After cleaning, air
dry the element completely and moisten
with a small amount of motor oil.
3.Place the filter element into the air cleaner
housing and press the cover against the
housing until it clicks. Never forget to
attach the screen. If the screen is not
attached, the cleaner will not seal properly
and the dusts come into the cylinder.
WARNING
Maintenance

■MUFFLER
•Inspect periodically, the muffler for loose
fasteners, any damage or corrosion. If any
sign of exhaust leakage is found, do not
use the blower and have it repaired
immediately.
•Note that failing to do so may result in
the engine catching on fire.
•Before starting operation, always make
sure to check if the muffler is properly held
by three bolts to the cylinder. (Fastening
Torque : 80~120kg·cm)
•Even if one bolt out of three bolts is loose,
the muffler may get loose during operation
which may result in engine catching on fire.
■SPARK ARRESTER
•The muffler is equipped with a spark
arrester to prevent red hot carbon from
flying out of the exhaust outlet. Periodically
inspect and clean as necessary with a wire
brush. In the State of California it is
required by law (Section 4442 of the
California Public Resources Code) to equip
a spark arrester when a gas powered tool
is used in any forest covered, brush
covered, or grass covered unimproved
land.
IMPORTANT
WARNING
■AIR INLET NET
•Blowing air is taken in from the air inlet net.
When air flow has dropped down during
operation, stop the engine and inspect the
air inlet net for blocking by obstacles.
•Note that failure to remove any such
obstacles may result in the engine
becoming overheated and damaged.
•Never use the blower without the net of
the blower. Before each use, check that
the net is attached in place and is free
from any damage.
WARNING
IMPORTANT
Maintenance
15 

Storage
BEFORE STORING THE BLOWER:
1.Drain a fuel tank and push the primer bulb
until it becomes empty of fuel.
2.Remove the spark plug and drop a
spoonful of 2-cycle oil into the cylider.
Crank the engine several time and replace
the plug.
■SHOULDER STRAP
•If the shoulder strap is damaged it may
break during use, thus causing the product
to fall and resulting in personal injury.
Follow the instructions below to replace the
shoulder strap.
•Pass the upper end of the strap through the
hanger, making the FLAPPED SIDE
OUTSIDE.
•Put the end of the strap through the ring on
the strap, and then push the ring toward
the hanger as close as possible.
Maintenance
•The flap on the end of the strap works
as a stopper. Never install the strap with
the flapped side inside, or the unit may
fall from the operator, which could
result in injury to the operator and/or
damage to the unit.
WARNING
16 

17 
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 name and the
serial number are applicable to those specified in the parts list, then use parts number
described in the parts list.
4. The contents described in the parts list may change due to improvement.
5. The parts for the machine shall be supplied seven (7) years after the machine is
discontinued. [It is possible that some specific parts may be subject to change of their
delivery term and list price within the limit of seven (7) years after the machine is
discontinued. It is also possible that some parts may be available even after the limit of
seven (7) years.]
BACKPACK BLOWER
EB4401
310001 and up
APPLICABLE SERIAL NUMBERS :

18 
Parts List : EB4401
Fig.1 BLOWER GROUP (S/N 310001 and up)

19 
EB4401
Fig.1 BLOWER GROUP (S/N 310001 and up)
Key# Part Number Description Q'ty
12750-31111 VOLUTE CASE 1
22750-31212 VOLUTE COVER 1
32750-31150 SCREW M5x25 9
43490-11150 ELBOW 1
507000-02095 O-RING 1
62750-31420 SCREW M5x70 2
73310-53331 NUT 2
8T4012-31310 COVER INLET 1
92750-31150 SCREW M5x25 3
10 1140-72231 CLAMP 1
11 3407-16120 SCREW M5x14 1
12 2750-31290 TUBE 1
13 2750-31911 LABEL 1
14 T4012-32610 LABEL, net 1
15 2750-31510 FAN 1
16 3407-12210 BOLT M5x40 4
17 2750-31612 ENGINE COVER 1
18 2750-31150 SCREW M5x25 4
19 2750-72230 CLAMP 1
20 T4012-32002 FRAME ASSY 1
21 T4012-32101 • FRAME COMP 1
22 3490-21121 • RING 2
23 3460-21311 PAD 1
24 3495-21320 CLIP 4
25 2756-32300 BAND ASSY 2
26 T4012-32500 NET COMP 1
27 1480-74710 CLIP 4
28 2750-32510 DAMPER,UPPER 1
29 2750-32520 WASHER 1
30 2750-32530 SCREW M5x40 1
31 2750-32541
BOLT M5x16 (Large Washer) 2
32 2750-32610 DAMPER,LOWER 2
33 2750-32620 NUT M6 2
34 2756-85102 TANK ASSY 1
35 T1015-85202 • CAP ASSY 1
36 4500-85300 • • HOLDER ASSY 1
37 4500-85220 • • PACKING 1
38 5601-85260 • • FILTER 1
39 4820-85260 • • STOPPER 1
40 2756-85300 • PIPE COMP 1
41 3302-85400 • FILTER 1
42 1260-85460 • CLIP 1
43 3407-23610 SCREW 2
44 1100-86120 CLIP 1
61 T4017-51110 HOSE 1
62 2750-51201 SWIVEL JOINT 1
63 6811-51211 PIPE, straight 1
65 2756-51510 CLAMP 1
Key# Part Number Description Q'ty
66 2756-51520 CLAMP 1
67 3407-91000 TOOL SET 1
68 3540-91120 • SPANNER 1
69 3407-91130 • SOCKET 1
70 2756-51220 PIPE, end ø57 1

20 
Parts List : EB4401
Fig.2 ENGINE GROUP (S/N 310001 and up)