Zenoah EHT753S, EHT753D, EHT603D User Manual

eHT753S

eHT603D

848-D3N-93A1 (704)

OWNER’S MANUAL

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

• Keep this manual handy.

CAUTION

HEDGE-TRIMMERS

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.

■ NOTES ON TYPES OF

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

IMPORTANT

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Contents

1. PARTS LOCATION ………………………3

2. SYMBOLS ON THE MACHINE …………4

3. SAFETY PRECAUTIONS ………………5

4. FUEL………………………………………12

5. OPERATION ……………………………13

6. MAINTENANCE …………………………15

7. SPECIFICATIONS ………………………20

English

WARNING

1. Plate receive

2. Right handle

3. Starter

4. Fuel cap

5. Left handle

6. Engine Stop switch

7. Throttle lever

8. Fuel tank

9. Muffler

10. Blade

11. Air cleaner

12. Spark plug

13. Gear case

14. Throttle cable

15. Choke lever

16. Front handle

17. Engine switch

18. Safty lock lever

19. Rear handle

20. Lock lever

21. Grease nipple

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1. PARTS LOCATION

3

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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 TANK CAP

(b).The direction to close the choke
POSITION: AIR CLEANER COVER

(c).The direction to open the choke

POSITION: AIR CLEANER COVER

1. CLEANER

Please inspect the cleaner

every
day for dirt. Please clean out any
dust that is found up to the
element on the carburetor side.
When rebuilding the cleaner, be
sure to follow the following order:
element → felt → element. If

dust remains on the cleaner
when it is used, the dust may
enter the engine, cause abrasion
in the pistons, and lead to engine
damage.

2. GEAR CASE

Please re-supply the gear case
with grease every 25 hours.
Grease must be added every
day if the unit is used in dusty
areas. Grease should be added
until the old grease emerges.
Dirty grease is a cause of
internal abrasion.

3. BLADES

Please replace the blades

if the

space between them becomes

0.7mm or more. This is because
dust may enter the gear case
and cause abrasion.

WARNING

2. SYMBOLS ON THE MACHINE

4

3. SAFETY PRECAUTIONS

■ BEFORE USING THE MACHINE

a. Read this owner's manual

carefully to understand how to
operate this unit properly.

b. This product has been designed

for use in trimming leaves and
branches from trees and hedges,
and it should never be used for
any other purpose since doing so
could result in unforeseen
accidents and injuries occurring.

c. You should never use this hedge-

trimmer when under the influence
of alcohol, when suffering from
exhaustion or lack of sleep, when
suffering from drowsiness as a
result of having taken cold
medicine, or at any other time
when a possibility exists that your
judgment might be impaired or
that you might not be able to
operate the hedge-trimmer
properly and in a safe manner.

d. Avoid running the engine indoors.

The exhaust gases contain
harmful carbon monoxide.

e. Never use your hedge-trimmer

under circumstances like those
described below:

1. When the ground is slippery or
when other conditions exist
which might make it not
possible to maintain a steady
posture while using the hedge­trimmer.

2. At night, at times of heavy fog,
or at any other times when your
field of vision might be limited
and it would be difficult to gain a
clear view of the area.

3. During rain storms, during
lightning storms, at times of
strong or gale-force winds, or at
any other times when weather
conditions might make it unsafe
to use this product.

f. When using this product for the

first time, before beginning actual
work, learn to handling the hedge­trimmer from skilled worker.

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5

3. SAFETY PRECAUTIONS

g. Lack of sleep, tiredness, or

physical exhaustion results in
lower attention spans, and this in
turn leads to accidents and injury.
Limit the amount of time over
which the hedge-trimmer is to be
used continuously to somewhere
around 30~40 minutes per
session, and take 10~20 minutes
of rest between work sessions.
Also try to keep the total amount
of work performed in a single day
under 2 hours or less.

h. Be sure to keep this manual

handy so that you may refer to it
later whenever any questions
arise.

i. Always be sure to include this

manual when selling, lending, or
otherwise transferring the
ownership of this product.

j. Never allow children or anyone

unable to fully understand the
directions given in this manual to
use this hedge-trimmer.

■

WORKING GEAR AND CLOTHING

a. When using your hedge-trimmer,

you should wear proper clothing
and protective equipment as
follows.

(1) Helmet
(2) Protection goggles or face

protector
(3) Thick work gloves
(4) Non-slip-sole work boots
(5) Ear protectors

b. And you should carry with you

things as follows.

1. Attached tools and files

2. Properly reserved fuel

3. Spare blade

4. Things to notify your working
area (Rope, warning signs)

5. Whistle (for collaboration or
emergency)

6. Hatchet or saw (for removal of
obstacles)

c. Never use your hedge-trimmer

when wearing pants with loose
cuffs, when wearing sandals, or
when barefoot.

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3. SAFETY PRECAUTIONS

■ WARNING CONSIDERING
HANDLING OF FUEL

a. The engine of this product is

designed to run on a mixed fuel
which contains highly flammable
gasoline. You should never store
cans of fuel or refill the fuel tank in
any place where there is a boiler,
stove, wood fire, electrical sparks,
welding sparks, or any other
source of heat or fire which might
ignite the fuel.

b. Smoking while operating the

hedge-trimmer or refilling its fuel
tank is extremely dangerous.
Always be sure to keep lit
cigarettes away from the hedge­trimmer at all times.

c. When refilling the tank always turn

off the engine first and take a
careful look around to make sure
that there are no sparks or open
flames anywhere nearby before
refueling.

d. If any fuel spillage occurs during

refueling, use a dry rag to wipe up
spills before turning the engine
back on again.

e. After refueling, screw the fuel cap

back tightly onto the fuel tank and
then carry the hedge-trimmer to a
spot 3m or more away from where
it was refueled before turning on
the engine.

■ THINGS TO CHECK BEFORE
USING YOUR HEDGE-TRIMMER

a. Before beginning work, look

around carefully to get a feel for
the shape of the land, or grass to
be trimmed, and whether or not
there are any obstacles which
might get in the way while
working, and remove any
obstacles which can be cleared
away.

b. The area within a perimeter of

15m of the person using the
hedge-trimmer should be
considered a hazardous area into
which no one should enter while
the hedge-trimmer is in use, and
when necessary yellow warning
rope, warning signs should be
placed around the work area.
When work is to be performed
simultaneously by two or more

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3. SAFETY PRECAUTIONS

persons, always check the
presence and locations of others
so as to maintain a distance each
person sufficient to ensure safety.

c. Make sure that there are no loose

screws or bolts, fuel leaks,
ruptures, dents, or any other
problems which might interfere
with safe operation. Be especially
careful to check that there is
nothing wrong with the blades or
with the joints by which the blades
are attached to the hedge­trimmer.

d. Never use blades that are bent,

warped, cracked, broken or
damaged in any way.

e. Keep the blade always sharp.
f. Filing the cutting edges, keep the

end corner sharp and round the
root of the edge.

g. Check the bolt to fasten the blade

and be sure the blade turns
smoothly without abnormal noise.

■ NOTES ON STARTING THE
ENGINE

1. Take a careful look around to
make sure that no obstacles exist
within a perimeter of 15m or less
around hedge-trimmer.

2. Place the body of the hedge­trimmer onto the ground in a flat
clear area and hold it firmly in
place so as to ensure that neither
the blades nor the throttle come
into contact with any obstacles
when the engine starts up.

3. Place the throttle into the idling
position when starting the engine.

4. After starting up the engine, if the
blades continue to rotate even
after the throttle has been moved
fully back, turn off the engine and
check the throttle wire and other
parts.

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3. SAFETY PRECAUTIONS

■

KICKBACK SAFETY PRECAUTIONS

•A dangerous reaction may occur
when the spinning blade contacts
a solid object in the critical area.
It is called Kick back. As a result,
the operator can lose control of
the unit which can cause serious
or fatal injury.
Avoid kickback, observe the
safety precautions below strictly.

1. Keep the cutting blades clear of
fances, posts, wires, and rocks to
prevent kickback and damage to
the blades.

2. When using your hedge-trimmer,
do not grip other parts except the
handles.

3. When using your hedge-trimmer,
never take your eyes off. If you
need to, place the throttle into the
idling position.

4. When using your hedge-trimmer,
do not let the unit get closer to
your feet nor raise the unit above
your waist.

■ NOTES ON TRANSPORTATION

a. Make sure the appropriate blade

cover is in place.

b. When transporting by car, fix the

unit firmly using a rope. Do not
transport by bicycle or motorbike
because it is dangerous.

c. Never transport the hedge-

trimmer over rough roads over
long distances without first
removing all fuel from the fuel
tank, as doing so might cause fuel
to leak from the tank.

■

OPERATION SAFETY PRECAUTIONS

a. Grip the handles of the hedge-

trimmer firmly with both hands. If
you suspend the work, place the
throttle into the idling position.

b. Always be sure to maintain a

steady, even posture while
working.

c. Maintain the speed of the engine

at the level required to perform
cutting work, and never raise the
speed of the engine above the
level necessary.

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9

3. SAFETY PRECAUTIONS

d. If the grass gets caught in the

blade during operation, or if you
need to check the unit or refuel
the tank, always be sure to turn off
the engine.

e. If the blade touches a hard object

like a stone, immediately stop the
engine and check if something is
wrong with the blade. If so,
replace the blade by new one.

f. If someone calls out while working

,always be sure to turn off the
engine before turning around.

g. Never touch the spark plug or plug

cord while the engine is in
operation. Doing so may result in
being subjected to an electrical
shock.

h. Never 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. Doing
so may result in serious burns.

i. When you finish cutting in one

location and wish to continue work
in another spot, turn off the engine
and turn the unit as the blade
faces away from your body.

■ MAINTENANCE SAFETY
PRECAUTION

a. Perform the maintenance and

checking operations described in
this manual at regular intervals. If
any parts must be replaced or any
maintenance or repair work not
described in this manual must be
performed, please contact a
representative from the store
nearest ZENOAH authorized
servicing dealer for assistance.

b. Under no circumstances should

you ever take apart the hedge­trimmer or alter it in any way.
Doing so might result in the
hedge-trimmer becoming
damaged during operation or the
hedge-trimmer becoming unable
to operate properly.

c. Always be sure to turn off the

engine before performing any
maintenance or checking
procedures.

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d. When sharpening, removing, or

reattaching the blade, be sure to
wear thick, sturdy gloves and use
only proper tools and equipment
to prevent injury.

e. When replacing blade or any other

parts or when replacing the oil or
any lubricants, always be sure to
use only ZENOAH products or
products which have been
certified by ZENOAH for use with
the hedge-trimmer.

3. SAFETY PRECAUTIONS

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4. FUEL

•Gasoline is very flammable.
Avoid smoking or bringing any
flame or sparks near fuel.

• Wipe up all spills before
starting the engine.

•Make sure to stop the engine
and allow it cool before
refueling the unit.

• Keep open flames away from
the area where fuel is handled
or stored.

•Never use oil for 4 cycle engine
use or water cooled 2-cycle
engine.

• Never use "FUEL WITH NO OIL
(RAW GASOLINE)".

• Never use fuel laced with water.

• Mixed fuels which have been left
unused for a period of one month
or more may clog the carburetor
or result in the engine failing to
operate properly. Put remained
fuel into an air-tight container and
keep it in the dark and cool room.

• Please ask for “mixed gasoline for
air-cooled 2-cycle engines” at your
nearest gas station, or use fuel
made by putting unleaded
gasoline for automobiles and air­cooled 2-cycle engine oil into a
mixing container in accordance
with the following ratios and then
shaking to mix well.

Mixing ratios:

When using Zenoah genuine 2-cycle
oil (FC grade):

50:1 (100 ml of oil for

every 5 liters of gasoline)

When using commercially available
2-cycle oil (FB grade):

25:1(160 ml of oil for

every 4 liters of gasoline)

IMPORTANT

12

WARNING

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5. OPERATION

■ STARTING THE ENGINE

Keep the blades clear of
everything around It as they will
start moving upon the engine
starts.

1. [eHT753S] Make sure that the
throttle lever is at idling position.
[eHT603D] Release the throttle
lever and make sure it is fully
back. (F1)

2. [eHT603D] Set the engine switch
to the “I (RUN)” position. (F1)

3. Push the primer pump until
overflown fuel flows out in the
clear tube. (F2)

4. Move the choke lever to the
closed position. (F3)

(1) Throttle lever (7) Stop

(2) Full throttle (8) Primer pump

(3)

Idling (start position)

(9) Clear tube

(4) Stop switch (10) Choke lever

(5) Engine switch (11) Open

(6) Run (12) Close

5. Place the unit on a flat, firm place.
Keep the cutting head clear of
everything around it.

6. While holding the unit firmly, pull
out the starter rope quickly. (F4)

7. After the engine has started, allow
the engine to warm up. Pull the
throttle lever.

■ STOPPING THE ENGINE (F1)

[eHT753S]

1. Please return the throttle lever
completely.

2. Press the stop switch until the
engine comes to a complete stop.

[eHT603D]

1. Release the throttle lever.

2. Move the engine switch to the
“O(STOP)”position.

If the engine doesn’t stop after
stopping the switch, close the choke
so that engine will stop after a little.

NOTE

F1

F2

F3

F4

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WARNING

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■ CUTTING WORK

•Weather conditions and altitude
may effect carburation.

• Do not allow anyone to stay
close to the hedge-trimmer
while working or while
adjusting the carburetor.

■ HOW TO USE

HANDLE [eHT603D only] (F5)

To reduce fatigue when trimming
hedges, the handle can be swivelled
through 90° to the left or right.

Do not press the throttle during
this operation!

Proceed as follows:

1. Free the handle by pressing the
locking lever.

2. Turn the handle until the locking
lever clicks into place.

3. When the handle is locked in its
new position, you can apply the
throttle again.

(1) Handle
(2) Locking lever

• Use only as much throttle as is
needed to do the job. Excessive
engine speed is unnecessary.

• Avoid cutting thick branches, for
which will damage the blades and
shorten the life of drive systems.

• Tilting the trimmer 5 to 10° to the
cutting object will make the job
easy and bring a good result.

•Always keep your body to the
carburetor side of your trimmer,
never on the muffler side.

• When a new machine is first
operated, in the first few minutes
grease may come out of the gear
case. But, since this is excess
grease, there is no cause for
alarm. Just wipe it off with the
engine stopped for next use.

WARNING

5. OPERATION

F7

F6

F5 [eHT603D]

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6. MAINTENANCE

F8

F10

F9

Before cleaning, inspecting, or
repairing the unit, make sure that
the engine has stopped and is
cool.

■ BLADE (F8)

• Check the blade and the fasteners
for looseness, cracking, or
bending.

• Check the cutting edges and
reform with a flat file.

Point:

1. Keep the end corner sharp.

2. Round the root of the edge.

3. Do not use water when using a
grinder.

■

ADJUSTING THE BLADE GAPS (F9)

To adjust the blade gaps, proceed as
follows.

1. Fully tighten the blade-securing
bolts.

2. Loosen the tightened blade­securing bolts by 1/2 ~ 3/4 turns.

3. With the blade-securing bolts
loosened as described in step 2,
tighten the nuts.

4. Make sure that the upper and
lower blade move smoothly.

(1) Blade-securing bolt
(2) Nut
(3) Locations for adjusting the

blade gaps (4 locations)

(4) Locations for adjusting the

blade gaps (3 locations)

■ SAFETY LOCK (F10)

Stop operation when the safety
lock is defective.

Safety lock is the device not to
accelerate the throttle lever without
intention. While pushing the safety
lock, you can accelerate the throttle
lever.

(1) Safety lock

1. Check if the throttle lever does not
move when you do not push the
safety lock.

2. Check if the throttle lever moves
when you grasp or release it while
pushing the safety lock.

WARNING

15

WARNING

16

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6. MAINTENANCE

F11

F12

3. Check if the safety lock returns to
its original position when you
release your hand from safety
lock.

If you find any defects at the checks
above, contact your nearest servicing
dealer for repair.

■ ANTI-VIBRATION SYSTEM (F11)

The deformed or damaged anti­vibration system may cause of the
breakages like getting rickety or
falling off of engine and/or blade.

• [eHT753S] Check periodically if
the rubber cushions are not
deformed or damaged.

• [eHT603D] Check periodically if
the springs are not deformed or
damaged.

■ AIR CLEANER (F12)

Release the air cleaner cover and
remove dusts. In case the element is
dirty, carefully wash it with warm
water containing neutral detergent.
Completely dry before refitting the
element. If the element is deformed
or damaged, replace it with new one.

(1) Element
(2) Filter
(3) Air cleaner cover

Clogged air cleaner spoils engine
performance. Also, operation with no
element or with deformed or
damaged element causes irregular
wear outs of the engine mechanism.

IMPORTANT

WARNING

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6. MAINTENANCE

F13

F14

F15

■ FUEL FILTER (F13)

When the engine runs short of fuel
supply, check the fuel strainer for
blockage.

■ WAY OF THE COOLING AIR
(F14)

This engine is air-cooled. Dust
clogging between the inlet port of the
cooling air and cylinder fins will
cause overheating of the engine.
Periodically check and clean the
cylinder fins after removing the air
cleaner and the cylinder cover.

■ SPARK PLUG (F15)

Starting failure and mis-firing are
often caused by a fouled spark plug.
Periodically clean the spark plug, and
replace with a new one as required.

When dismounting the plug cap, be
careful not to take off the seal from
the plug cap. Operating the engine
without seal may cause overheating
of the engine.

When setting up the spark plug,
screw it by your fingers at first, then
tighten by using special plug wrench.
Over tightening will damage the
cylinder and piston.

Tightening Torque:

15.3 ~ 22.4 N.m (150 ~ 220kgf-cm)

Type of Plug Spark Gap

Champion CJ6Y 0.6 ~ 0.7 mm

IMPORTANT

IMPORTANT

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6. MAINTENANCE

F16

F17

F18

■ GEARCASE (F16)

Supply multi-purpose grease at every

20 hours of use

.

1. Use a grease pump.

2. Feed grease until it comes out of
the base of blades.(F16-a)

■ ADJUSTING CARBURETOR
(F17)

The carburetor has been adjusted at
the factory. Should your unit need
readjustment due to the changes in
altitude or operating conditions,
please let your skillful dealer make
the adjustment. A wrong adjustment
may cause damage to your unit.

(1) Idle adjusting screw
(2) Up
(3) Down
(4) Fuel adjusting screw

(Opening 1 ± 1/4)
(5) Decrease
(6) Increase

■ THROTTLE WIRE PLAY (F18)

Throttle wire play should be 1~2 mm.
After completely returning the throttle
lever, take the throttle wire at the
carburetor end in your fingers and
give a light tug. If the play is too great
or too small, readjust the position of
the wire retaining nut. Loosen the
lock nut and turn the wire retaining
nut clockwise (screw in) to increase
the play and counter-clockwise
(unscrew) to reduce it. After
adjusting, please fasten the wire
retaining nut by tightening the lock
nut.

a. Lock nut
b. Wire retaining nut
c. Wire sleeve

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6. MAINTENANCE

F19

F20

■ MUFFLER

AFTER 100 HOURS OF USE

1. Remove the muffler, insert a

screwdriver into the vent, and
wipe away any carbon buildup.
Wipe away any carbon buildup on
the muffler exhaust vent at the
same time. (F19)

(1) screw driver
(2) muffler

2. Tighten all screws, bolts, and

fittings.

3. Check to see if any oil or grease

has worked its way in between the
clutch lining and drum, and if it
has wipe it away using oil-free,
lead-free gasoline.

■ MAINTENANCE BEFORE

STORAGE

Use a dry rag to wipe any fuel which
has been spilled onto the unit.
(F20)

1. Extract fuel from the tank and run

the engine until it stops naturally.

2. Remove the spark plug and put in

1~2 cc of 2-cycle oil in the engine.
Pull the starter rope 2~3 times, set
the plug back, and stop it at the
contraction position.

3. Apply anti-rust oil to the metal

parts such as the throttle wire etc.,
put the cover on the blade, and
keep it indoor avoiding dampness.

IMPORTANT

English

Model name

.................. eHT753S [eHT603D]

Type

.......Single blade [Double-blade],

double-action type

Blade length

.............................. 750 [600]mm

Engine model

........................... Zenoah G20LH

Displacement

......................................... 21.7cc

Carburetor

.......................... Diaphragm type

Ignition system

........................................... C.D.I

Spark plug

......................... Champion CJ6Y

Fuel

........................................ Mixture

when using ZENOAH genuine oil

(FC grade)........................... 50:1

when using market oil

(FB grade) ........................... 25:1

Fuel tank capacity

...................................... 0.4 litres

Starter

.............................. Recoil starter

Clutch

.......................... Centrifugal type

Reduction ratio

............................................ 5.11

Dry weight

................................ 5.15 [5.1] kg

Specifications are subject to change
without notice.

7. SPECIFICATIONS

Head Office:

1-9, Minamidai, Kawagoe-city, Saitama, 350-1192 Japan

Telephone: [phone] Telecopier: ([phone]