Keyang KY-350S User manual

BACK PACK TYPE BRUSH CUTTER
www.keyang.com
KY-350S
KY-400S
KM-430S
KY-540S
KY-350N
KY-400N
KM-430N
KY-540N
MANUAL
Please read this manual to the last
for safe and efficient operating
before using, keep well in place
can find easily.
품질보증서 재중

2
We, Keyang Electric
Machinery Co., Ltd., would
like to express our sincerest gratitude to
you who always use our power tools.
You must read carefully this“instruction
manual”before use the tool for safe and
effective operation.

3
• Safety Instructions ···················4
• Parts Names ······················13
• Regarding how to assemble ············14
• Product Specifications ················19
• How to start the engine ··············20
• How to turn off the engine ············22
• Working Techniques ·················22
• Maintenance and long-term storage ······23
• Before you call for service ·············24
•MEMO ··························25
Table of
Content
We, Keyang Electric Machinery Co., Ltd., have done best efforts for research and
development to improve quality of our products. Thus, the shape or structure of the
model can be changed without previous notice.
Note

4
•SAFETY INSTRUCTIONS
The instructions in this user’s guide include critical information for safe use. When
you do not keep the instructions, you may cause death, serious injury and property
damage.
In the event the instruction
is not followed, it is
possible that serious injury
or death may occur highly.
In the event the instruction
is not followed, it is
possible that serious injury
or death may occur.
In the event the instruction is not
followed, it is possible that troubles,
which can disable or degrade the
product performance, may occur.
CautionWarning Caution
When working, wear the following protective
gears.
■To protect head, wear safety hat.
■To protect eyes, wear safety glasses.
■To protect ears, wear earmuffs.
■Wear knee protectors.
If protective gears were not worn, flying objects
such as rocks can cause injuries.
Warning
■ CLOTHING
1. SAFE USAGE
※ Illustrative signs used on the product and in the handling instructions are as follows:
This sign means“Care is needed”because there are possibilities that danger may occur under certain conditions.
This sign means“Prohibited”because there are possibilities that danger may occur under certain conditions.
Please always keep in mind that Brush Cutter is a machinery that uses sharp blades and gasoline,
which is an inflammable matter. Use it with care.
For safe usage, the notations are divided into“Warning”and“Caution”depending on the level
of danger involved. Their meanings are as follows:
In order to prevent accidents that can happen easily while using or handling the Brush Cutter, and also for work
safety, the Safety Instructions are divided into the sections of Clothing, Environment, Fire hazards, Pre-operation
stages, Operational stages and Postoperation stages. These warnings and cautionary instructions for safety cannot
cover all possible situations or conditions that can happen. Therefore, scrupulous cares are needed when operating
or storing the product. Please read completely and understand. And be careful so that accident does not occur.

5
Wear clothing that is suitable for work.
■Wear slip resistant safety shoes.
■Wear gloves when working.
■Tie long hairs above shoulders.
■Do not wear hanging down clothes, neckties,
scarves, or ribbons.
Working with unsuitable clothing can become a
cause of accident by slipping, getting burned, or
getting caught in the machine while working.
Do not use the tool in indoors or where
ventilation is poor.
■Toxic emission gas can cause suffocation.
■ ENVIRONMENT
Do not use when it is raining.
■Can receive electric shock and can cause an
accident by slipping
Do not use when unable to operate the product
normally due to alcohol, drug or anything else.
■It can causes a safety accident.

6
Do not open the fuel tank cap or refuel while
the engine is running or when the engine is
hot.
■It can cause fire or burn.
■ Fire Hazard
Remove rocks, wires, cans, etc. from the
working area.
■Obstructing objects can cause injuries.
■ Pre-operation stages
Inspect the safety cover and always use with
the safety cover attached.
■If used without the safety cover being attached
or used with a cracked or malfunctioning safety
cover, foreign objects such as rocks can shoot
out and cause injuries.
Do not smoke or make a bonfire near the
Brush Cutter.
■It can cause a fire.

7
Absolutely do not use when there is something
wrong with blade.
■If used when there is something wrong with blade
such as being nicked, cracked or bent, it can cause
death or injury. If there is something wrong with
blade, always replace with a new one.
If the way the blade is assembled looks not
right, do not use the equipment
■After the blade is assembled, turn it with hand. If
there is wobble or strange noise, it can cause an
accident through vibration when it rotates. When
there is something wrong, always reassemble and
verify before using.
Before turning on, always adjust the throttle
lever to low speed (L). Only after that, turn it on.
■If the lever is at high speed, the blade starts rotating
abruptly and can cause an accidents.
Grab the Brush Cutter securely so that it won’t
move and make sure that the blade is not
touching the ground, and then, turn it on.
■If the blade touches the ground, it can break off or
shoot out and cause an accidents.
Low speed
Check tightness of each part before using.
■If used with loosened parts or without some parts, the
product can be damaged or cause injuries.
Ground

8
While working, do not allow any animal or
person to approach within 15 meters radius.
■Rotating blade or foreign object can shoot out
and cause injuries.
Use the blade for designated uses only.
■Number 3, 4 and 5 blades are only for cutting
grass and thus, should not be used for wrong
uses such as cutting trees, etc.
■ Environment
Do not turn the adjusting screw on the
carburetor.
■It can make the blade start rotating abruptly and
cause an accidents.
adjusting nut
over 15meters
When working on a hill or a sloping ground,
make sure to maintain the balance and work
with stable posture.
■Working from unstable posture can cause slipping or
falling and can cause an accident.

9
Be careful not to come into contact with high-
tension wires or with spark plug area while
operating the equipment.
■It can cause an electric shock.
The old and the weak or children should not
use.
■Unskilled use can become a cause for an
accident.
Do not work near steel wires or vines.
■Steel wires or vines can be tangled up or shoot
out and cause an accident.
Do not allow any part of body or clothing to
touch the blade while operating.
■The sharp blade rotates in high speed and can
inflict serious injury.

10
If fuel is spilled, wipe it off thoroughly.
■Spilled fuel can stain clothing or cause a fire.
■ Pre-operation stages
Start the engine at least 3 meters away from
the place where you refueled or where you
store fuel.
■Because of heat or the sparks generated by the
engine, fire can be ignited.
If there is any abnormal vibration while
operating, stop the engine immediately.
■It can cause a breakdown of the machinery or
can cause an accidents.
CAUTION
When stopping the work or moving to another
location, make sure to stop the engine and be
careful not to allow the blade to touch your
body.
■In case the blade rotates due to malfunction or
bumps into body, it can cause an accidents.
■ Post Operation Stages
Stop

11
■ Post-operation Stages
When the Brush Cutter is not used while
resting, etc, stop the engine and put it down in
horizontal position.
■In case fuel gets leaked out, it can cause a fire.
When inspecting, do it after stopping the
engine and separating the spark plug cap from
the plug.
■False start can cause an accidents.
Do not operate with only one hand.
■Unstable manipulation can cause an accidents.
Do not touch the engine until it cools down
■There are many parts that radiate large amount
of heat such as muffler, etc. These parts remain
hot even after the engine is turned off and can
cause burns.

12
When storing for a long-term(more than 20
days), always drain fuel before storing.
■If stored with fuel undrained, it will become
difficult to start the next time due to the settled
deposits in fuel passages.
When storing for a long-term, clean each part
and apply thin coat of oil on metal parts.
■Rust can make the product inoperable or
degrade its performances.
Observe the mixture ratio of the fuel.
■Observe the mixture ratio of 20~25 parts of
Gasoline to 1 part of 2-cycle engine oil. Too
much oil causes smoky exhaust fume and
degrade the output power. Too little oil can
damage the engine due to excessive heat.
CAUTION
Gasoline
and oil
mix ratio
25:1

13
󱄵2 step Separation type
KY-350S, KY-400S, KY-540S, KM-430S
•PARTS NAMES
Fuel tank
Back plate
Air-Cleaner
Recoil starter
Muffler
Flexible shaft hose
Loop handle (Hand holder)
Stop pin
Rubber handle
Throttle lever
Connector case
stop switch
Blade
Drive shaft tube
Handle
Joint body
Shoulder band
Gear cluster
Safety guard
▲ KY-350N, KY-400N
KY-540N, KM-430N
Gear case assembly
Blade
Safety cover
Working bar

14
•REGARDING HOW TO ASSEMBLE
Keyang brush cutter is separated in 3 different parts at large; Main body(Engine part), Flexible shaft hose part
and Working bar. Please assemble as following order and technigues.
1. How to assenble the drive shaft tube and flexible shaft hose.
~ After assembling, be sure to check the connecting condition once more.
Groove(Drive shaft tube side)
Cap A
Drive shaft tube Flexible shaft hose
Hexagonal bolt
Connector
Flexible shaft
L type wrench
Hole(Engine side)
Cap B
2. ASSEMBLY
Before assembling the flexible shaft hose and main body, please remove the cap A and B; when keep in store
by separated, please cover the caps.
After removing the bolt by L wrench, please push in the
elastic shaft into connector; and then set the bolt as well.
※ After connection, be sure to check if the flexible shaft hose and drive
shaft tube are well set each other by pulling. (If too much tight set, it
might cause broken the unit.).

15
Please cover the connected part with protection
rubber as arrow direction.
(when engine starts, there might happen being
burnt.)
※Please set the protection rubber
to the flexible shaft hose as
figure.
Stop pin, Up, Down, Socket, When assemble the flexible shaft
hose, with stop pin up, please push in the flexible shaft to
socket hole correctly, then set free the stop pin. When the pin
enters to the hole, it sounds "click".
※ After setting together, please pull the flexible shaft hose, to
check if it removes.
Protection rubber
flexible shaft hose(black)
flexible shaft
Hole
Stop pin
Socket
Groove
Protection rubber
Down
Socket
Stop pin Up
It can cause a burn while
running the engine
Caution

Throttle wire lead wire(Black) lead wire(Red)
Lead wire cover
16
2. How to assemble the lead wire and the throttle wire
When shipping at factory, as the throttle lever and wire are
assembled, in order to assemble the throttle wire on the drive
shaft tube with setting the throttle lever at low speed, please
pull the wire as arrow direction; and then the wire gets
separated from the throttle lever handle.
After assembling the throttle wire in lever, please set the
lever on the bar, where the location it is possible by
hand control.
throttle lever
driver
washer
bolt
Throttle lever handle
High speed
Low speed
wire
After setting the lead wire cover on the flexible shaft hose assembled with releasable tie
please connect the black and red lead wires; the throttle wire let be passed inside the rubber handle.
Rubber handle Releasable tie
Lead wire cover
Terminal
Throttle wire

17
3. Loop handle(holder) setting
4. How to assemble the 2 step drive shaft tube (KY-350S, KY-400S, KM-430S, KY-540S)
5. Blade setting (option specification)
Please assemble completely
the handle as figure shown at
the convenient position for
working.
Release the handle in counter clockwise. After pulling the stop pin, the shaft A gets pushed the socket B hole in; with the holes of
stop pin position and drive shaft tube set together; the stop pin sets free.(“click" sounds). By turning slowly the drive shaft tube of
no getting hole together with stop pin; get set the holes together correctly.
Common blade(3 way, 4 way,
circular saw) setting
In gear assembly, after assembling the
washer A, blade, washer B, blade
cover, and nut by order; with L
wrench, the grass cover hole gets in
washer hole A; after getting no turning
the blade, the nut should be set tightly
with box spanner.(In case of no getting
together the holes of grass cover and
washer A; with L wrench by turning
the blade a little the holes get together;
and then the blade is being set.)
Never set the handle tightly without drive shaft tube. After assembling, be sure to check if they
are well assembled by pulling.
handle working bar A
hole
shaft A
socket B
setting
stop pin
Caution
handle cover
handle rubber
loop handle
bolt
grass cover A
washer A
chain cutter
washer B
box spanner
NUT
grass cover B
gear assembly
left setting
L wrench

6. Attaching the Safety cover.
Please assemble carefully the washer A and B by order and direction.
When turned counter clockwise, it gets set, and turn clockwise(right), it gets released,(opposite nut).
Be sure to have gloves on.
Please catch tightly the L type wrench for not rotating the blade.
How to assemble the nylon
blade(option item)
After setting the L type wrench by
inserting the grass cover washer A,
with washer B gets set, by turning left
the nylon blade, it gets assembled.
The length of nylon blade is mostly
suitable in 12cm and 14cm.
gear cluster, grass cover, washer A,
washer B, nylon blade, left setting
8 way blade
comparative tough weed
Saw blade
shrub below 20mm
diameter
② Selection of Blades
• Do not use the 3way, 4way or 8way blades to cut tree or small branches. For safety, please don't use the blade of bigger
diameter than our company's regulation blade.
If any use of private made blade, or non regulation blade, it can cause an unexpected engine trouble. Any accident due to
those non suitable blade, we cannot be responsible by our company at all.
Caution
Do not work without safety guard and check the damage before attaching
Chain blade
tender and little weed
Nylon blade
tender and little weed
Cutting 3 way blade
(grass only)
tender
and little weed
4 way blade
comparative little weed
nylon blade
left setting
12~14cm
grass cover A
gear assembly
washer A
washer B
18
after insent the bolt into the cover band, tighten the bolt with + driver
safety cover band
safety cover
gear case
bolt
+ driver

19
Grease tube
Protection rubber
Box spanner & driverAuxiliary fuel tank
Automatic centrifugal clutch: Spiral bevel gear; Flexible shaft(rubber bar)
17:21
Counter clockwise (in upper view)
Right handle lever
3.1
Keyang Mitsubishi
KY171 KY201 TL-43
Forced air - cooled 2 cycle gasoline engine
32.6 40.6 42.7
1.7 2.0 2.1
Floating type
Non-contact electric ignition
Recoil starter
Gasoline: Engine oil(20~25:1)
1.4
6.0 6.6 6.9
1,500
730
Chain cutter
Division
Item
Main body
(Drive shaft
tube)
Engine
(engine &
back plate)
Drive shaft tube length(mm)
Flexible shaft length(mm)
Blade(Option)
Power transmitting method
Reduction gear ratio
Blade rotating direction
Handle method
Weight
Engine name
Type
Displacement(cc)
Maximum power(ps)
Carburetor
Ignition type
Starting type
Fuel
Fuel tank capacity(l)
Weight
KM-430N
KM-430S
KY-400N KY-540N
KY-400S KY-540S
KY-350N
KY-350S
• PRODUCT SPECIFICATIONS
Standard accessories(Including additinal parts)
Safety guardLoop handle(lever)
Double spanner
L wrench Releasable tie
Chain cutter(Option) Instruction manual

low speed
20
•HOW TO START THE ENGINE
3. HOW TO OPERATE
Fuel gets filled in fuel tank. Fuel can be used the mixed oil with the unleaded
gasoline for automobile and engine oil for 2 cycle engine.
Set the throttle lever to the lower speed L by adjusting.
Fuel gets filled in fuel tank.
Mixing rate of gasoline and 2 cycle
engine oil
2 cycle engine oil
Mix ratio, 25(gasaline):1(2 cycle engine oil)
Gasoline
In case of using of wrong blending oil, It can cause some engine troubles. When oil gets spilled out,
always clean up ; if not, It can stain clothing or cause fire.
If it is set at high speed position, since the blade gets turned suddenly, it is very dangerous.
Turn the fuel cock to open position and supply
fuel to the carburetor carburettor
close
open
fuel cock