Honda UMT20S Owner Manual

FOREWORD
Dear Honda user
Thank you for purchasing a HONDA trimmer / brush cutter and for your confidence in
our product.
This manual has been written to make you familiar with your new equipment, to enable
you to operate it in the best conditions and to carry out its maintenance.
While our aim is to have you benefit at the most from technological advances, new
equipment or materials as well as from our experience, our models are steadily
improved; This is why HONDA EUROPE POWER EQUIPMENT S.A. reserves the right
to make changes at any time without notice and without incurring any update obligation.
That is why the characteristics and information given in this manual may be modified
without notice and without any updating obligation.In case you are having problems or
for any questions you might have regarding your equipment, contact your dealer or an
authorised HONDA retailer.Keep this manual within reach to be able to consult it any
time and make sure it remains with the equipment if resold. We recommend that you
read the guarantee policy to fully understand your rights and responsibilities. The
guarantee policy is a separate document provided by your dealer.
No part of this publication may be reproduced without written permission.
EXPLANATION OF CODES USED IN THIS MANUAL:
Type
| In Option: E: D type that comes with a four-tooth disk
F: D type that comes with a three-tooth disk
UMT41 DE
LL] T
Model! D = Dual handle models
S = One grip models
J = One grip models with distance-bar
FX = Models with back-type motor and flexible transmission
DEFINITIONS :
In this manual, hand-held models equipped simply with a handle are described
by the general term “GRASS CUTTER”. They are identified, in this manual, as
type “S”. Hand-held models equipped with a handlebar or a distance bar are
described by the general term “HAND-HELD BRUSH CUTTER". They are identified,
in this manual, as types “D” and “J”, respectively. Models where the motor is
carried on the operator's back are described by the general term “BACK-T YPE
BRUSH CUTTERS”. They are identified as type “FX”. The description “BRUSH
CUTTER” includes both the “CARRIED” and “BACK-TYPE” categories of
machines of types “D”, “J” and “FX”.
1° issue: 02/1997
TABLE OF CONTENTS
FOREWORD
GENERAL DESCRIPTION
1. Identification of components
2. Identification of the equipment
3. Safety stickers
4. Explanation of the safety symbols
SAFETY INSTRUCTIONS
ASSEMBLY
1. Grips and handle
2. Exhaust pipe
3. Cutting tools
4. Tool deflectors
5. Cutting systems assembly
6. Harness assembly and setup
PREPARING AND CHECKING BEFORE OPERATING
- 1, Balancing the equipment
2. Composition of fuel mixture
3. Filling the tank
4, Before starting up
STARTING AND STOPPING THE ENGINE
1. Cold start
2. Hot start
3. Stopping the engine
OPERATING
1. Operating position
2. With nylon thread cutting head
3. With a grass cutting disk
4. With a circular saw blade
MAINTENANCE
1. Carburettor setting
2. Spark plug inspection
3. Air filter
4. Gear box greasing
5. Maintenance schedule
TROUBLESHOOTING
CARRYING AND STORAGE
1. Carryng
2. Storage
ACCESSORIES
TECHNICAL SPECIFICATIONS
NNO Ov Oy o
o
11
17
11
13
13
14
16
17
17
18
19
20
21
21
22
22
23
23
23
26
28
29
29
30
31
37
32
33
34
34
34
35
36
GENERAL DESCRIPTION
1. IDENTIFICATION OF COMPONENTS
GENERAL DESCRIPTION
1. Engine 13. Transmission case
2. Spark plug 14. Nylon thread cutting head
3. Recoil starter grip 15. Cutting disk
4. Air filter 16. Harness fastening point
5. Fuel tank (mixture) 17. Harness
6. Throttle cable 18. Handle
7. Clutch casing 19. Back mount
8. Control grip 20. Distance-bar
9. Throttle control trigger 21. Starter control
10. Start / Stop switch 22. Carburettor priming
11. Transmission shaft 23. Transportation protector
12. Transmission flexible pipe 24. Primer pump
25. Protector blade
A. Identification plate
B. Safety warning : Read owner's manual
C. Safety warning: Projections risks
D. Safety warning: Cutting tools authorised
E. Safety warning: Protective equipment
F. Transmission shaft maximum speed
2. IDENTIFICATION OF THE EQUIPMENT :
1. Name and address of the manufacturer
2. Conformity marking according to modified
89/392 EEC DIRECTIVE as amended
3. Model and type aie rrr Sv аа
4. Year of manufacture
5. Serial number
45140 ORMES ~ FRANCE
GENERAL DESCRIPTION
3. SAFETY STICKERS
Your trimmer / brush cutter should be operated with caution.
Therefore, stickers intended to remind you of the main operating precautions have
been placed on the equipment in the form of pictograms. Their meaning is explained
below.
These stickers are considered an integral part of the equipment. Should any of these
come off or become difficult to read, contact your dealer to replace it.
We also recommend you read carefully all safety instructions given in next chapter of
this manual.
4. EXPLANATION OF THE SAFETY SYMBOLS :
В.
I
E. —
y W
F. <> 6800 min”
2
WARNING : Read owner's manual before operating the
equipment.
WARNING : Projections risk. Keep all people or pets at
a distance of at least 15 m when operating the
equipment.
SINGLE-GRIP MODELS :
(UMT20S, UMT245)
Grass cutter can only be operated with a Nylon thread
cutting tool.
(UMT32J, UMT32FX, UMT41FX, UMT51FX))
Use the brush cutter with a nylon thread type cutting tool
or plastic or metal discs.
Do not use circular saw blades.
You have to wear personal protective equipment.
Always put on safety glasses (projectile risks) and noise
protectors such as ear muffs (risk of damage to hearing
when operating your equipment) when operating your
equipment.
Information on transmission shaft maximum speed.
SAFETY INSTRUCTIONS
Any part of the equipment can represent a potential source of danger in case of wrong
usage or bad maintenance.
Pay special attention to statements preceded by the following words :
A WARNING :
Warns against a risk of bad injury or even death if instructions are not followed
CAUTION :
Warns against an eventual risk of injury or material damage if instructions are not
followed.
NOTE: Useful information source.
This sign reminds you to pay special care under certain
operations. Refer to safety instructions on the following
SAFETY pages, outlined item(s).
TRAINING
A1. Read carefully all instructions given in this manual. Become familiar with the correct use and controls
before operating the trimmer / brush cutter. Know how to stop the engine quickly.
A2. Use the trimmer / brush cutter for the purpose it was intended, i.e. :
e (Cutting grass by means of a nylon thread, along beds of flowers, plantations, walls, fences or small
surface fawn, to complete mowing done with a lawnmower.
e And for brush cutters (types D and J) only :
Clearing tall grass and copse, by means of metal or plastic blades.
« And for brush cutters equipped with a handle ((types D, J and FX only) :
cutting shrubs a section of 6 cm at most, by means of circular saw blades.
e Any other use can cause an unsafe condition or lead to equipment damage.
A3. Never allow children or persons unfamiliar with these instructions to operate the trimmer / brush
cutter. Local regulations may limit the age limit of an operator .
A4. Never operate the trimmer / brush cutter :
* When people, especially children, or pets are nearby. Respect the safety distance of 15 m minimum
between the equipment and third persons.
Trimmer / brush cutter should be operated by only one person.
e [If user has taken medication or substances known to affect judgement or reactions.
e With a tool protector not suitable to the cutting tool being used. When using a nylon thread cutting
head, make sure thread cutter blade is in place so as to ensure correct thread length.
* When such safety devices as tool protector are missing or if protector is damaged.
SAFETY INSTRUCTIONS
AS.
AO.
Do not alter your trimmer / brush cutter. You would run the risk of seriously compromising your
safety by exposing yourself to serious injury.
Keep in mind that the operator or user is responsible for accidents or hazards occurring to other
people or their properties.
GETTING READY
B1. Don't use the equipment when barefoot or when wearing open sandals and dressed with full clothes
that might be caught by brushwood.
While working you must wear long trousers, boots or safety boots with anti-skid soles, glasses or a
cap that will protect you from projections, leather gloves and ear defenders.
In all areas where objects might fall (branches, stones...), protect your head with a safety helmet.
B2. Thoroughly inspect area to be cleared and dispose of all foreign objects which might be thrown up
by the equipment (stones, pieces of wood, steel wire, bones, etc...).
B3. WARNING : DANGER ! Gasoline is highly flammable.
o Store fuel in containers specifically designed for this purpose.
o Refuel outdoors only , before starting the engine, and do not smoke while refuelling or handling the
gasoline container.
e Never remove the fuel tank cap or add gasoline while the engine is running or while it is still hot.
. Do not attempt to start the engine if gasoline is spilt : move the trimmer / brush cutter away from
where gasoline is spilt and avoid creating any source of ignition until the gasoline has evaporated
and vapours have dissipated.
° nstall fuel caps securely to make sure both fuel tank and container are correctly closed.
B4. Replace faulty mufflers.
B5. Before each operation, always run a general inspection and check more specifically tools aspect,
cutting set, protection guards and fixing bolts to make sure these are not worn out, broken or loose.
Always check that the throttle control trigger and STOP button are operating correctly.
B6. See to the correct positioning of both handles and harness fastening point as well as to the correct
balance of the equipment. Positions and correct settings are explained in chapter “Preparing and
checking before operating” of this manual.
В’. See to idle speed correct setting so that tool will stop rotating as soon as the throttle control is
released.
OPERATING
Ci. Do not operate the engine in a confined space where dangerous carbon monoxide fumes can collect.
C2. Work by daylight only.
C3. Whenever possible, avoid using the equipment on wet ground.
C4. When operating the equipment, keep the safety distance with the blade, given by the location of the
harness fastening point.
C5. Walk, never run or let yourself be in a situation of unstable balance. Watch out for such obstacles as
stones, stumps etc... that may make you stumble.
C6. Always be sure of your footing on slopes. Operate across slopes, never up and down.
C7. Do not operate the equipment on excessively steep slopes that may represent a hazard for the
operator.
It is operator's responsibility to evaluate operating ground potential risks and take all necessary
precautions to ensure his safety. This is especially important when working on slopes, rough grounds,
slippery or loose surfaces.
C8. Never change the engine setting to over-speed it.
SAFETY INSTRUCTIONS
Ce.
C10.
C11.
Before starting the engine, make sure no people stand within a distance 15 m from the equipment, the
cutting tool will not touch the ground and the equipment is stable.
Start the engine with caution, respect operating instructions and keep away from the tool.
Stop the engine and disconnect spark plug cap in the following cases :
Before any intervention on the cutting system.
Before any cleaning, checking, adjustment or trimmer / brush cutter repair operation.
Only carburetor and idle speed settings are done while engine is running. During this operation, make
sure the tool will not hit any object and that the equipment is stable.
After striking a foreign object. Inspect cutting system and transmission shaft for damage. Make all
necessary repairs before operating the equipment again.
If trimmer / brush cutter starts to vibrate abnormally. Immediately look for what caused the vibrations
and fix it.
Stop the engine in the following cases :
Whenever the trimmer / brush cutter is left unattended.
Before refuelling.
When moving to different work places.
MAINTENANCE AND STORAGE
D1.
D2.
D3.
D5.
DE.
D7.
D8.
D9.
D10.
10
Keep all bolts and nuts tightened to ensure safe use conditions. Regular maintenance is an essential
aid to operator safety retaining a high level of performance.
Do not use the equipment if some parts are worn or damaged. Parts must be replaced, not repaired.
Use genuine parts only. Cutting tools must always bear manufacturer's plate as well as their part
number, maximum operating speed and rotating direction in case of circular saw blades. Parts of
different quality may damage the equipment and be injurious to your safety.
Wear heavy gloves when disassembling and reassembling the cutting device.
Never store your trimmer / brush cutter filled up with fuel in a room where gasoline vapours could reach
a flame, spark or an intense source of heat.
Store in a clean and dry room, out of reach of children.
Let the engine cool off before storing the equipment.
To reduce fire hazards, keep your equipment and more especially the engine, its cooling ribs, muffler
and gasoline storage area, free of leaves, grass cuttings and excessive oil,
Always cover cutting blade with its carrying protector when storing or carrying your equipment to avoid
accidental injuries.
It the fuel tank has to be drained, this should be done outdoors when the engine is cold.
Care for the environment and do not dispose of your old engine oil or gasoline by pouring it down the
drain, gutters or by spilling it on the floor. Local fuel stations can have oil and gasoline safely recycled.
ASSEMBLY
Back-type brush cutters are supplied in two sections: the motor and the transmission.
The transmission is fitted onto the motor section as shown in the illustration below.
Check that the flexible end fitting [1] is completely engaged in its recess on the
transmission side [2] by rotating it. Make sure that the assembly is properly locked [3]
and that the electrical connector [4] and the gas cable [5] are correctly connected up.
й E ! SAS Y
É Wen 10 ra !
is Elf A ЧН 1
i
The handle [7] and the distance bar [8] are assembled as shown in the
illustration below. Brush cutters and grass cutters are supplied assembled in
their packaging. Only the handlebar [6] or handle [7] or [8] has to be fitted on
the transmission tube in accordance with the illustrations below.
1. GRIPS AND HANDLE :
Carried brush cutters of type J as well as back-type brush cutters can be used
on the right or left-hand side, according to whether the operator is right-handed
or left-handed.
Make sure that the cable sheath [10] is positioned as shown, along the
transmission flexible pipe without being wound around it.
The distance bar [8] of types J and FX can be fitted on the right or left for right-
handed or left-handed operators.
2. EXHAUST PIPE
Back-carried brush cutters are supplied ready for use by right-handed operators.
If the brush cutter is to be used on the left, it is mandatory to direct the exhaust
outlet in the direction shown by the arrow [9] in the illustration so that the
exhaust fumes are never directed towards the operator.
11
ASSEMBLY
Tools inside the bag supplied with your equipment are to be used for assembly. Tool
bag contains the following :
[A] Tool bag
[B] Spark plug wrench / Cutting system
[C] Grease for gear head (D types only)
[D] Slotted screwdriver
[E] Elbowed Torx wrench
[F] Cutting head lock pin
[G] Safety visor
[H] Gloves
When assembling handle [1], itis necessary to ensure its correct positioning in relation
to the rubber anti vibration shock absorber [4] : slide plate [5] welded on handle's tube
into shock absorber's housing. Then, place the combined parts in handle's holder by
12
ASSEMBLY
3. CUTTING TOOLS :
Types S and J are delivered equipped
with a Nylon thread cutting head [1].
The metallic four-tooth disk [2] and its
carrying protector [3] are delivered
separately in J types packaging and FX.
D types are delivered equipped with either
the three-tooth (option F) or the four-tooth
(option E) metallic grass cutting disk [2]
with its carrying protector [3].
Nylon cutting head [1] is delivered
separately in the packaging.
4, TOOL DEFLECTORS :
[sarerv ) |A4
Trimmers are delivered with an already
assembled [A] type protector. This
protector is intended to be used with the
Nylon thread cutting head only.
Brush cutters are delivered with an already
assembled [B] type protector, to be used
with grass cutting disks, and an extension
protector [B1] intended to be secured on
protector [B]lwhen using the equipment
With a Nylon thread cutting head.
D type brush cutters (dual handle)
additionally include a [C] type protector,
for use with a circular saw blade (not
supplied)
ASSEMBLY
5. CUTTING SYSTEMS ASSEMBLY
a) [A] PROTECTOR: (S Models only)
Install protector [A] on transmission head
with screws [1] and supplied Torx wrench.
Make sure thread cutter is correctly set.
b) NYLON THREAD CUTTING HEAD :
(for all models)
Screw in Nylon head and make sure
spacer [2] is already installed on
transmission shaft. Tighten
counterclockwise. Use supplied wrench
and lock rod [11] for adequate tightening.
c) [B] and [B1] PROTECTORS: (supplied
with models of type D, J and FX only)
Install part [B] of grass cutting disk
protector on transmission head with
screws [3] and tighten securely with Torx
wrench.
When using a Nylon head, install protector
[B1] on protector [B] with the five bolts [4], and
make sure bottom part of protector [B1]is lined
up on the same level with Nylon thread.
Install thread cutter [5] on protector [B1]
d) FOUR-TOOTH DISK : (Delivered with
models of type D , J and FX)
(sacev | [D3
Place grass cutting disk between spacers
[6] and [7] so that spacers’ flutings and
axle shaft nest into each other completely.
Install washer [8] and stabiliser [9], then
14
ASSEMBLY
tighten securely screw[10] counterclockwise
with supplied wrench, by locking up axle’s
rotation with lock pin [11].
e) CIRCULAR SAW BLADE
PROTECTOR :
(Supplied with D type models only)
Circular saw blade (available as an option)
15 assembled the same way as grass
cutting disk.
Install protector [C] with fixing screws [1]
on transmission head as shown.
Tighten securely with supplied Torx
wrench.
ASSEMBLY
6. HARNESS ASSEMBLY AND
SETUP:
À WARNING :
For safety and operating convenience,
itis important to adjust harness’slings
so that you do not feel any constraint
and that the equipment is correctly
balanced in working position.
Equipments of types S and J are delivered
with a single sling harness, to be slung
over the shoulder [A].
Brush cutters of type D are delivered with
a DUAL sling harness, to be slung over
both shoulders and tightened around the
waist [B].
Fit the harness and lock slings with quick
fastening straps [2].
Then adjustthe size of slings with adjusting
buckles [3], in order to bring equipment’s
fastening point at waist level, as shown by
[A] and [B].
The back motor mount [C] for back-type
brush cutters is fitted with adjustable straps
[3] and is put on like a rucksack.
Adjust the straps as shown, so that the
motor mount is always firmly fitted on the
user's back. (The padded cushion must
be pressed against the back).
16
1. BALANCING THE EQUIPMENT :
PREPARING AND CHECKING BEFORE OPERATING
(For types S, J and D only)
Both types of harness are equipped with
a quick hook off device on the equipment.
This type of fixing enables operator to
quickly free himself from the equipment in
case of emergency.
Hook trimmer / brush cutter as shown
Unhooking is done by fully tilting lock
lever [1] towards the front while retaining
the equipment.
Once the equipments in working position,
it Is essential to check its balance. This
check must be done with the cutting tool
fitted on the equipment and half full fuel
tank.
When the equipment is fitted with either a
Nylon head or circular saw, it is correctly
balanced if cutting head's base lies less
than 200 mm above floor level, yet without
touching it [A]. When using a cutting disk,
it must be used together with the stabiliser
(p. 12-N°[9]). Correctbalance is obtained
when stabiliser touches the ground and
applies only very light pressure to it [B].
Light effort on grips should be enough to
lift tool up from the ground.
Should some adjustment be necessary,
move fastening point [1] towards front if
foo! is too “heavy”, or backwards in the
opposite case :
loosen screws [2] with supplied Torx wrench so as to move control grip [3] or support
[4] to the desired position.
CAUTION : Be careful not to stretch throttle cable too much when moving grips.
Check that throttle control trigger operates correctly.
17
PREPARING AND CHECKING BEFORE OPERATING
Tighten screws [2] slightly, then adjust
single-grip’s [5] ordual handle’s [6] position
by loosening the screws [7] to obtain a
convenient operating position.
À WARNING :
OnDtypebrushcutters, make sure support
[4] is never set beyond collar [8] placed on
cables’ sleeve. This would cause the
equipment to be unbalanced, and the
safety distance between the operator
and cutting tool to be unsufficient.
Once you have reached the correct
position, check balance again and readjust
if necessary.
Then tighten securely screws [2] and [7]
to lock grips into position.
2. COMPOSITION OF FUEL MIXTURE :
CAUTION : Your equipment cannot be operated without the AN
appropriate gasoline/oil mixture. Use of non approved gasoline and B3
‘ . . . . , . [ sareTY |
oll or of incorrect ratio mixtures will cause irreversible damages.
Use a 2-stroke engine gasoline/oil mixture in a ratio of 4% of oil.
It is however recommended to use HONDA specific synthetic oil. In this case, ratio
to be considered is only 2% of oil.
Recommended fuel : ordinary, leaded or unleaded gasoline, with an octane number
of 90 or higher.
Recommended oil :
2-stroke engines special mineral oil (4%).
2-stroke engines HONDA synthetic oil (2%).
CAUTION : Do not use automotive-type oil.
Prepare the mixture in a clean container, designed for this purpose, in low quantity to
avoid long-lasting storage.
18
PREPARING AND CHECKING BEFORE OPERATING
For a 1 litter mixture, pour 40 cm? (cc) 2-stroke engine oil into the container, and fill up
with new gasoline.
An oil cup used for measuring out the 2-stroke oil is usually integrated into the oil can.
With HONDA 2-stroke engines synthetic oil, pour 20 cn (cc) and fill up with new
gasoline.
Small HONDA oil bottles contain 100 cm? (cc) and are graduated every 20 cn? (cc).
they therefore allow to prepare 5 |. of mixture.
A WARNING:
Pressure can increase in containers filled with gasoline. Open fuel cap with
caution to avoid splashing fuel about. Store fuel in a cool area, for short periods
of time and never place it under the sun.
3. FILLING THE TANK :
CAUTION : Clean fuel tank cap and its
edges to prevent foreign matters from
entering fuel tank.
Shake the can well to ensure an uniform
gasoline/fuel mixture.
Fill the fuel tank from a jerry can fitted with
a suitable spout in order to prevent any
accidental spillage.
For convenience, place the equipment in
its operating position as shown here.
Make sure the equipment remains stable
throughout this operation so that it does
not fall over
PREPARING AND CHECKING BEFORE OPERATING
Fuel tank capacity :
Á WARNING :
Be careful not to spill fuel. If so, wipe B3
off areas where gasoline is spilt and
Wait for vapours to dissipate before Capac.
, ; ; Model
handling the equipment again. (lit.)
UMT 20S, UMT 24S, UMT 24D 0,7
Make sure fuel tank cap is well tightened
UMT 28D, UMT 32J, UMT 32D 7
4. BEFORE STARTING UP : UMT 32 FX
UMT 41D, UMT 51D
Check that the guard covers are properly — | UMT 41FX, UMT 51FX, 1,6
fitted and correctly tightened, that the
transport protection has been removed
and that you have the necessary protective
equipment, such as goggles, helmet and
ear protectors.
р А4 | В1 | В2 | В5
Make sure cutting tool and handle grips
are well tightened.
Move the equipment away from where the
tank has been filled up.
Stand on flat and stable ground.
Make sure spark plug cap is in place.
20
STARTING AND STOPPING THE ENGINE
A WARNING :
The equipment must
always lie down on
the ground for star |C1|C7|C9 (C10
ting. Check that it is
resting in a stable position and that the
tool is not in contact with any object or
with the ground.
1. COLD START :
The equipment is considered “cold” if
engine has not been running for more
than five minutes in the last 10 minutes
before starting again.
Place the Start/Stop button [1] in position
(Start) 18) -
For cold start, a throttle control trigger
locking device is designed to lock the
trigger in accelerated 1/3 position.
Depress safety lever [2] all the way down and
bring and holdthrottle controltrigger[3] against
handle grip.
Depress trigger lock button [4] and while
holding it down, release the trigger [3].
Throttle is then locked in accelerated 1/3
position.
Throttle can be returned to idle simply by
depressing trigger [3].
To make starting up easier, the equipment
is fitted out with a self-priming device,
enabling the fuel circuit to be replenished
with fresh fuel.
Fully depress self-priming button ES [5]
four or five times.
Move choke valve lever [6] all the way to
the left on position all.
STARTING AND STOPPING THE ENGINE
Gently pull recoil starter grip [7] until you
can feel a resistance. Then pull strongly
until the engine starts.
CAUTION : Do not pull recoil starter grip
to extent that cord is completely un-wound.
Do not step or put your knee on the
transmission tube to retain your
equipment. The tube could twist and make
the equipment unusable.
A WARNING :
When the engine starts, cutting tool
starts to rotate immediately. Put your
equipment to idle by depressing and
releasing throttle control trigger.
Once the engine has started, push back
throttle control [6] to the right.
2. HOT START :
The equipment is considered “hot” if
engine has been running for more than
five minutes in the last 10 minutes before
starting again.
The procedure for hot starting is the same
as that of cold starting except that :
Throttle control trigger must remain on
idle.
There is no need for self-priming.
Throttle control must be set all the way to
the right, opposite of the mark EY .
3. STOPPING THE ENGINE
To stop the engine, push the Start / Stop
button onto position.
This control enables to stop the engine in
case of emergency fal .
22
OPERATING
1. OPERATING POSITION :
When the machine has been started up,
hook it onto the harness or install it on the
back as explained above, in the chapter
on preparation.
A WARNING :
When handling the equipment, avoid
stricking any objects with the cutting
tool and keep tool away from your
body. Do not use the equipment if it is
not hooked up to the harness.
Hold trimmer / brush cutter firmly by both
grips as shown.
SAFETY
Read operating safety
instructions
CAUTION : During the operation, always
let the engine go back to idle when not
cutting. If the engine is running for too
long periods of time at maximum speed
with no load (no vegetation resistance on
tool), serious engine damage may result.
2. WHIT NYLON THREAD CUTTING
HEAD
This tool is intended to complete the job
done with a lawnmower. It is particularly
handy and efficient for cutting grass along
walls or fences, around trees or stakes
and small or uneven surfaces that a
lawnmower cannot treat.
U
é A?
=
23
OPERATING
Thread length adjustment :
A ст
A WARNING : [ SAFETY )
Make sure thread length adjusting
cutter is well secured to tool's
protector.
Loosen centre grip [1] located underneath
the cutting head about three turns
clockwise [2], while holding head's lower
casing [3] (Fig. 1).
Then bring out new thread by pulling both
of its ends to the desired length, but do not
exceed 120 mm (use length marks [5]
engraved on the lower casing).
Tighten securely grip [1] by turning
counterclockwise.
If too much thread has been pulled out, it
is possible to rewind it by holding cutting
head's upper casing [4], and while grip [1]
Is untightened, turning lower casing [3]
clockwise.
An automatic head is available as an
option.
Thread replacement :
When all of the thread inside the reel has
been used up, it is possible to replace it.
Contact your authorised HONDA dealer
who can supply you with the appropriate
Nylon thread in long length reels. Fully loosen centre grip [1] by turning it clockwise
while holding cutting head's lower [2] and upper [3] casings (Fig.2).
Pull casings apart, Be careful not to lose washer [4] nor spring [5].
Take out pulley [6] and remember how it was assembled. Remove what is left of the
old Nylon thread. Remove upper casing's two brass guides [7]
Prepare a maximum length of 6 meters 2.4 mm (5 meters for a & of 3mm) new thread
and fold it in the middle so as to obtain two ends of equal length.
24
OPERATING
CAUTION : Always use a thread whose
diameter is recommended in the technical
specifications table.
Using a thread with a section too thin
would give a poor result and cause pre-
mature wear.
Using a thread with a section too thick
would have a bad effect on engine
performances by creating too much load,
and thus reducing the quality of the job.
ÂÀ WARNING :
Never replace Nylon thread with a
thread of a different material such as
wire.
Run both ends of the thread through the
two upper casing pulley holes [8] and join
them into pulley's groove.
For a thread of D 3 mm, clip loop [9] into
clips [10] so it will not interfere during
operation. |
Put pulley back into place, loop [9] inside
upper casing [3], while holding both ends
of the thread and making sure the loop is
well seated into clips [10].
Pull each end of the thread through
notches [11].
Run the thread through both brass guides
[7] and put these back into place. Be
careful about the mounting direction :
small width towards the inside of the
casing.
While retaining upper casing with the dri-
ve fingers, fully wind both ends clockwise into the groove. Let thread ends stick out to
the length marked on the casing.
Install spring [5] and then lower casing and make sure to engage drive fingers [12] into
notches [13].
Hold spring compressed, put washer back in its place and tighten grip.
A WARNING :
Make sure grip is correctly tightened to prevent thread from unwinding during
operation.
25
OPERATING
When restarting the engine and the tool, the exceeding length will be automatically cut
by cutter located on the protector (see pag.12).
a) Cutting:
The Nylon thread allows a clean cut of the grass, without damaging bark of trees or
prevents violent shock of a rigid tool against a hard surface.
It is however recommended not to maitain position on these objects, especially on
fragile, immature plants and trees. This will also prevent premature thread wear.
Proceed gradually when trimming, by tilting cutting head slightly.
For larger surfaces, hold tool horizontal and execute lateral moves alternatively from
the right to the left and vice versa.
a
a |
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CAUTION : Do not lay tool’s lower part onto the ground as it would damage it, as well
as the lawn.
3. WITH A GRASS CUTTING DISK :
Use ofgrass cutting disksis restricted
to equipments type J and D.
XT
>< >
LIE +, del Cc N
“X
COAST SA
NA ÍA ; A Г AY Й a
A
The four-tooth grass cutting disk (option
E) is intendedto clear vegetation such as
tall weed and small bushes, up to a
maximum diameter of 2 cm.
LL
NAN
\ ЗАЕМ,
"АМА
ETA 3
Mí
CAUTION : Do not use a disk with a
diameter greater than 255 mm (300 mm
for 41D and 51D).
26
OPERATING
a) Cutting:
Use the equipment like an hand held
scythe, by moving grass cutter from the
right to the left to clear the vegetation [1],
and then bring it back to the right away
from the vegetation [2] and so on [3].
A stabiliser [4] is installed under the disk
to guide the tool by lightly touching the
ground. The three-tooth grass cutting disk
(option F) is especially suitable for clearing
dense and tangled weed, as well as
bushes like bramble or wild shrubs whose
section is less than 2 cm. |
In the grass, handling is the same as with
the four-tooth disk. Y
To trim bushes, engage tool from above — |, Ss
»
("TE
Их
, . . ' Y -
and hold it horizontal, in order to cut С =, ; ИР
branches into small pieces. \ Ir РЕ ——
‘4 Tel mT М = -
\\/ Te р
| Ат
A WARNING : es
It is hazardous to use grass cutting disks on very hard pieces of wood and/or
having a too large section. Tool rebounds are hard to keep under control and can
seriously endanger operator’s safely and cause serious damage to the equipment.
b) Sharpening : — |D2|D3
Sharpening is essential to performing a WRONG
good quality job.
A slightly blunt tool can be sharpened
using a file.
If wear is more serious, itis necessary to
use a grinding wheel.
CAUTION : In all cases, it is essential to RIGHT
make sure the tool is always correctly
balanced. If you do not have the required
set of tools at your disposal or if you have
a doubt as to the correct balance of the 30°
tool, contact your authorised HONDA
dealer.
x 30°
27
OPERATING
Remove tool for sharpening and check
that it is not slit nor out of true nor bent. If
it is, replace tool with a new one.
Either side of a three-tooth or four-tooth
disk can be used. When one side is worn,
tool needs be turned over to use the other
side’s edges.
Only the bevel-edged parts of teeth are to
be sharpened. It is important to keep a
regular profile and avoid creating any
cracking. All teeth must be sharpened the
same way.
WRUNG
CAUTION : Replace disk as soon as the RIGHT
wear limit is reached (as shown in the
illustrations below). | |
[A] Cracking
[B] Beyond the limit and unequal tooth profile
[C] Incorrect and unequal angles
[D] Sharpening limit
[E] Incorrect cutting profile
4. WITHA CIRCULAR SAW BLADE :
A WARNING :
The use of a circular saw blade is only
authorized on carried brush cutters of
type D.
CAUTION : Do not use a saw blade with
a diameter exceeding 300 mm for models
UMT41D and UMT51D or exceeding 255
mm for other models. Circular saw blade is intended to be used for clearing shrubs,
bushes and small trees whose trunk does not exceed a diameter of 6 cm.
a) Cutting:
Some blade sectors must not be used as they will cause tool to rebound owing to the
direction of rotation.
Tools fitted on HONDA grass cutters are turning counterclockwise.
It is therefore strongly advised not to cut with the right half of the blade. Part to be used
is shown by sector [A]
28
MAINTENANCE
Togetagoodresult, itis necessary to give your equipment a quick swinging movement
towards the branch or trunk to be cut. Do not proceed gradually as the engine speed
could drop and make it stall.
A WARNING
Estimate the height of the cut objects and where they might fall.
Check that falling pieces will not injure persons or damage
property. Make sure blade is not stuck in the trunk when it falls.
Always cut opposite to the fall. А4 | В1
b) Sharpening :
A circular saw blade can be sharpened with a file [1] if it is only slightly worn.
It is very important to keep the correct teeth profile, as well as cutting angles and teeth
pitch. If more sharpening is required, contact your authorised HONDA dealer who has
access to suitable specialist sharpening
equipment. (2)
If necessary he will check and adjust —
tool’s pitch [2]. N Y/
1. CARBURETTOR SETTING Imm,
o | 1 mm
Machines are individually set at the factory.
Further setting may however be necessary
if operating the equipment at higher
altitude. D
Disk should be fitted and air cleaner should F4 ) N
| AN
be clean when performing this setting. C
IZ
Note : Basic setting is obtained when (1) < 2
screws [1] and [3] are fully tightened and © Sy
NN
A
A
then loosen one turn.
a) Minimum speed setting :
While engine if off, tighten up but do not
lock idle speed pilot screw [1], then loosen
it one turn.
Start the engine and let it run at idle
speed.
Tighten slowly screw [1]. Engine speed B7 | C1lc11
will first increase, then decrease. As soon
29
OPERATING
as it decreases, loosen screw [1] 1/4 of a turn. Check that engine speed increases
without faltering.
Then adjust idle screw [2] so the tool will stop rotate when engine is at idle.
Tighten idle screw [2] until tool starts to rotate.
Let the engine speed stabilise then slowly untighten screw [2] until tool stops rotating,
then loosen 1/4 of a turn.
Note : Once idle speed is set, it might still be necessary to re-adjust idle speed pilot
screw with screw [1]. Proceed as above and check once more that the tool will stop
rotate at idle.
b) Maximum speed setting:
Bring engine speed to its maximum.
Untighten maximum speed pilot screw [3] until the engine starts to operate erratically
(its speed decreases and ignition is irregular). Then re-tighten screw [3] 1/4 to 1/2 of
a turn. Check that the engine goes back to idle and that the tool stops rotating when
throttle lever is released. These adjustments can be made more accurately using an
electronic revolution counter. Contact your authorised HONDA dealer in case of doubt
or miss-operation.
Maximum Minimum
2. SPARK PLUG INSPECTION : Model speed speed
(UMT 20, UMT 24 | 8500 min” | 2700/2900 mir
Remove cap and loosen spark plug with | UMT 28, UMT 32 4 4
the supplied wrench. | UMT 32FX 10000min | 2700/2900 min
Clean electrodes with a metallic brush to
get rid of carbon deposit.
In case they show signs of wear, replace
spark plug with a new one, of similar
characteristics.
Check electrode gap with feeler gauges.
When adjustment is needed, carefully
bend the side electrode.
Re-tighten spark plug with your fingers
until it rests on its seat.
In case of a new spark plug, tighten 1/2
more turn with the spark plug wrench.
If you reinstall the same spark plug, 1/8 to
1/4 of a turn should be enough.
| ОМТ 41, UMT 41FX | 10500 min. 2700/2900 mir"
LUMT 51, UMT 51FX | 10000 min | 2500/2700 mir"
CAUTION : A spark plug that is not correctly tightened is likely to heat up and damage
the engine. Overtightening the spark plug or crossthreading will do irremediable
damage to the engine.
30
OPERATING
3. AIR FILTER :
Foam air filter element must be cleaned
regularly to prevent impurities from
entering the engine causing premature
wear. A dirty air filter will reduce engine
power and increase fuel consumption.
Open air filter cover [1] and take out
filtering element [2] from its filter case [3].
Clean it with soapy water or in a non-
flammable solvent, then let it dry up.
Replace foam element and filter cover.
4. GEAR BOX GREASING :
Remove screw [1] on gear box. Insert the
lithium special grease tube nozzle and
while rotating the tool by hand, fill in with
grease until it goes back out through the
screw hole [1].
Re-install the screw and tighten
moderately.
31
MAINTENANCE
5. MAINTENANCE SCHEDULE :
(lithium grease)
Period :
Maintenance to be performed at Every Every y ear
indicated time intervals shown or At each Every 15 year or © е J
operating hours whichever occurs first. use hours every Р by your
. 30 dealer
ltem Action hours
Engine cooling ribs Clean
Tool's and protectors condition | Check
Gear box head surroundings Clean
Gear box head Grease
Flexible pipe (FX types) Check
Stop button operation Check
Idle / Clutch Check
Air filter element Check
Clean
Air filter case Clean
Spark plug surroundings Clean
Spark plug Check
Replace
Carburettor surroundings Clean
Cables and connections Check
Fuel filter Check / Replace
Springs and clutch shoes Check / Replace
Fuel line Check
Carburettor Clean / Adjust
32
TROUBLESHOOTING
Problem:
e Machine does not start
e Engine does not reach its maximum
speed:
e Engine stalls at idle :
Checking :
e [s the START/STOP button set on
position {@) ?
e Spark plug cap is disconnected ?
e Is there any fuel or did condensation
form inside fuel tank ?
e Engine is choked (spark plug is wet).
e Spark plug is fouled, or electrode gap is
incorrect.
e Is choke lever still set to position Ml ?
e Are air filter and spark plug clean ?
e |s the oil/gasoline fuel mix ratio correct ?
e [s there any condensation inside the fuel
tank ?
e 15 the maximum speed pilot screw
correctly set ?
e Is the fuel tank air breather clogged ?
(collection of impurities around the
screw at the end of the pipe)
® [5 the ¡dle speed pilot screw or the idle
speed screw correctly set ?
33
CARRYING AND STORAGE
. CARRYING: —
1. CARRYING Ea,
КА
In all cases, when carrying the trimmer i ||
or brush cutter, you must stop the | 0
engine and place the carrying protector Az
over the tool. Nr > /
To carry the equipment, hold it by the ; Л
transmission tube so it is balanced. a К-во À A
If the equipment is to be placed aboard a
vehicle, make sure it is well secured, so it
will not move. The equipment should be
So set as to avoid any risk of fuel leakage. 1
D1 D10
2. STORAGE :
Should the equipment not be operated for a period exceeding two months, it is
advisable to take the following precautions for storage :
Drain fuel tank and run the engine to empty the carburettor.
Remove spark plug and pour a few drops of oil (same quality as that used for the fuel
mixture) into the cylinder. Gently pull recoil starter rope to distribute the oil on cylinder
walls and piston, then re-install the spark plug.
Clean the equipment thoroughly, be careful to remove vegetable matter that gathered
around the tool, into the engine cooling ribs and under the cowlings.
Lay a thin film of standard oil with a brush over the metallic
tools to prevent corrosion.
Store the equipment inside its packing in a dry cool place.
If the equipment is to be stored vertically, place it so that the
engine is at the bottom and make sure it will not tilt.
ACCESSORIES
Miscellaneous accessories are delivered with the equipment
or available as options, depending on the models.
The table below gives the various mounting possibilities mr A2
depending on the models.
34
ACCESSORIES
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