Dolmar LT-210 User Manual [en, es, fr]

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String Trimmer









Read this instruction manual carefully before putting the String Trimmer into operation and strictly observe the safety regulations! Preserve instruction manual carefully!

Recommandation importante:

Lire soigneusement ce manuel d’instructions avant de mettre la taille-bordures en service et observer rigoureusement les consignes de sécurité!

Conserver soigneusement ce manuel d’instructions.


Leer cuidadosamente este manual de instrucciones antes de poner en marcha la máquina y observar estrictamente las normas de seguridad.

Conservar este manual de instrucciones con cuidado.


Thank you very much for purchasing the DOLMAR String Trimmer. We are pleased to recommend to you the DOLMAR String Trimmer which is the result of a long development programme and many years of knowledge and experience.

Please read this booklet which refers in detail to the various points that will demonstrate its outstanding performance. This will assist you to obtain the best possible result from your DOLMAR String Trimmer.

Table of Contents


Symbols ......................................................................


Safety instructions .....................................................


Technical data ............................................................


Designation of parts ...................................................


Mounting of handle .....................................................


Mounting of protector .................................................


Mounting of nylon cutting head ...................................


Fuels/Refueling ...........................................................


Points in operation and how to stop .........................


Nylon cutting head .....................................................


Servicing instructions ...............................................


Storage .....................................................................



You will note the following symbols when reading the instruction manual.

Read instruction Manual

Do not use metal blades


Take Particular Care and Attention

Top permissible tool speed

10000 /min


Fuel and oil mixture

Keep distance

Engine-Manual start

Flying object hazard

Emergency stop

No smoking

First Aid

No open flame


Protective gloves must be worn

Keep the area of operation clear of other


persons and pets


Wear eye and ear protection





General Instructions

To ensure correct operation, user has to read this instruction manual to make himself familiar with the handling of the string trimmer. Users insufficiently informed will risk danger to themselves as well as others due to improper handling.

It is recommended only to lend the string trimmer to people who have proven to be experienced with string trimmers.

Always hand over the instruction manual.

First users should ask the dealer for basic instructions to familiarize oneself with the handling of an engine powered trimmer.

Children and young persons aged under 18 years must not be allowed to operate the string trimmer. Persons over the age of 16 years may however use the device for the purpose of being trained only whilst under supervision of a qualified trainer.

Use string trimmers with the utmost care and attention.

Operate the string trimmer only if you are in good physical condition. Perform all work calmly and carefully. The operator has to accept liability for others.

Never use the string trimmer after consumption of alcohol or drugs, or if feeling tired or ill.

Intended use of the machine

The String Trimmer is only intended for cutter grass, weeds, Bushes, undergrowth it should not be used for any other purpose such as Edging or hedge cutting as this may cause injury.

Personal protective equipment

The clothing worn should be functional and appropriate, i.e. it should be tight-fitting but not cause hindrance. Do not wear either jewelry or clothing which could become entangled with bushes or shrubs.

In order to avoid either head-, eye-, hand-or foot injuries as well as to protect your hearing the following protective equipment and protective clothing must be used during operation of the string trimmer.

Always wear a helmet where there is a risk of falling objects. The protective helmet (1) is to be checked at regular intervals for damage and is to be replaced at the latest after 5 years. Use only the approved protective helmets.

The visor (2) of the helmet (or alternatively goggles) protects the face from flying debris and stones. During operation of the string trimmer always wear goggles, or a visor to prevent eye injuries.

Wear adequate noise protection equipment to avoid hearing impairment (ear muffs (3), ear plugs etc.).

The work overalls (4) protect against flying stones and debris. We strongly recommend that the user wears work overalls.

Special gloves (5) made of thick leather are part of the prescribed equipment and must always be worn during operation of the string trimmer.

When using the string trimmer, always wear safety shoes (6) with a nonslip sole. This protects against injuries and ensures a good footing.

Starting up the string trimmer

Please make sure that there are no children or other people within a working range of 15 meters (50ft), also pay attention to any animals in the working vicinity.

Before use always check that the string trimmer is safe for operation: Check the security of the nylon cutting head, the control lever for easy action.

Rotation of the nylon cutting head during idling speed is not allowed. Check with your dealer for adjustment if in doubt. Check for clean and dry handles and test the function of the start/stop switch.

Diagrammatic figure

15 meters


Start the string trimmer only in accordance with the instructions. Do not use any other methods for starting the engine!

Use the string trimmer and the tools only for such applications as specified.

Only start the string trimmer engine, after the entire assembly is done. Operation of the device is only permitted after all the appropriate accessories are attached.

Before starting make sure that the nylon cutting head has no contact with hard objects such as branches, stones etc. as the cutting tool will revolve when starting.

The engine is to be switched off immediately in case of any engine problems.

Should the nylon cutting head hit stones or other hard objects, immediately switch off the engine and inspect the nylon cutting head.

Inspect the nylon cutting head at short regular intervals for damage (detection of hairline cracks by means of tapping-noise test).

Operate the string trimmer only with the shoulder strap attached which is to be suitably adjusted before putting the string trimmer into operation. It is essential to adjust the shoulder strap according to the use’s size to prevent fatigue occurring during use.

During operation always hold the string trimmer with both hands. Always ensure a safe footing.

Operate the string trimmer in such a manner as to avoid inhalation of exhaust gas. Never run the engine in enclosed rooms (risk of gas poisoning). Carbon monoxide is an odorless gas.

Switch off the engine when resting and when leaving the string trimmer unattended, and place it in a safe location to prevent danger to others or damage to the machine.

Never put the hot string trimmer onto dry grass or onto any combustible materials.

The nylon cutting head has to be equipped with it’s appropriate guard. Never run the trimmer without this guard.

All protective installations and guards supplied with the machine must be used during operation.

Never operate the engine with faulty exhaust muffler.

Shut off the engine during transport.

During transport over long distances the tool protection included with the equipment must always be used.

Ensure safe position of the string trimmer during car transportation to avoid fuel leakage.

When transporting the string trimmer, ensure that the fuel tank is completely empty.

When unloading the String Trimmer from the truck, never drop the Engine to the ground or this may severely damage the fuel tank.

Except in case of emergency, never drop or cast the String Trimmer to the ground or this may severely damage the String Trimmer

Remember to lift the entire equipment from the ground when moving the equipment. Dragging the fuel tank is highly dangerous and will cause damage and leakage of fuel, possibly causing fire.


Shut off the engine during refuelling, keep away from open flames and do not smoke.

Avoid skin contact with mineral oil products. Do not inhale fuel vapor. Always wear protective gloves during refuelling. Change and clean protective clothing at regular intervals.

Take car not to spill either fuel or oil in order to prevent soil contamination (environmental protection). Clean the string trimmer immediately after fuel has been spilt.

Avoid any fuel contact with your clothing. Change your clothing instantly if fuel has been spilt on it (to prevent clothing catching fire).

Inspect the fuel cap at regular intervals making sure that it can be securely fastened and does not leak.

Carefully tighten the fuel tank cap. Change location to start the engine (at least 3 meters away from the place of refuelling).

Never refuel in closed rooms. Fuel vapors accumulate at ground lever (risk of explosion).

Only transport and store fuel in approved containers. Make sure the fuel stored is not accessible to children.





Tool Replacement

3 meters


Method of operation

Only use the string trimmer in good lighting and visibility. During the winter season beware of slippery or wet areas, ice and snow (risk of slipping). Always ensure a safe footing.

Never cut above the waist height.

Never stand on a ladder and run the string trimmer.

Never climb up trees to perform cutting operation with the string trimmer.

Never work on unstable surfaces.

Remove sand, stones, nails etc. found within the working range. Foreign particles may damage the nylon cutting head and can cause dangerous kick-backs.

Before commencing cutting, the nylon cutting head must have reached full working speed.

Cutting Tools

Employ only the correct nylon cutting head for the job in hand.

For cutting thick materials, such as weed, high grass, bushes, shrubs, underwood, thicket etc. (max. 2 cm dia. thickness). Perform this cutting work by swinging the string trimmer evenly in half-circles from right to left (similar to using a scythe).

Maintenance instructions

The condition of the trimmer also of the shoulder strap must be checked before commencing work.

Turn off the engine and remove the spark plug connector when replacing, and also when cleaning the nylon cutting head.

Operate the string trimmer with as little noise and contamination as possible. In particular, check the correct setting of the carburetor.

Clean the string trimmer at regular intervals and check that all screws and nuts are well tightened.

Never service or store the string trimmer in the vicinity of naked flames.

Always store the string trimmer in locked rooms and with an emptied fuel tank.

Observe the relevant accident prevention instructions issued by the relevant trade associations and by the insurance companies.

Do not perform any modifications on the string trimmer as this will endanger your safety.

The performance of maintenance or repair work by the user is limited to those activities as described in the instruction manual. All the other work is to be done by an Authorized Service Agent. Use only genuine spare parts and accessories released and supplied by DOLMAR.

Use of non-approved accessories and tools means increased risk of accidents.

DOLMAR will not accept any liability for accidents or damage caused by the use of non-approved nylon cutting heads and fixing devices of nylon cutting heads, or accessories.

First Aid

In case of accident, make sure that a first-aid box is available in the vicinity of the cutting operations. Immediately replace any item taken from the first aid box.

When asking for help, please give the following information:

Place of accident

What happened

Number of injured persons

Kind of injuries

Your name


The DOLMAR String trimmer will be delivered in two protective cardboard boxes to prevent transport damage. Cardboard is a basic raw material and is therefore consequently reusable or suitable for recycling (waste paper recycling).









Dimensions : length x width x height (without plastic guard)


1540 x 210 x 430 (60.6” x 8.3” x 16.9”)




Mass (without plastic guard and nylon cutting head)






Volume (fuel tank)






Engine displacement






Maximum engine performance


0.83 /7000 /min




Engine speed at recommended max, spindle speed






Maximum spindle speed (corresponding)






Idling speed






Clutch engagement speed






Carburetor (Diaphragm - carburetor)






Ignition system


Solid state ignition




Spark plug






Electrode gap


0.6-0.7 (0.024”-0.028”)






Mixed gas (gasoline : two stroke oil = 50 : 1)




1) The data is prepared taking equally into account the idling and racing or wide open throttle speed operating modes.

* WARNING: MODEL LT-210 must not be used with a metal blade.




String Trimmer






Fuel Tank


Rewind Starter


Air Cleaner cover


I-O Switch (on/off)


Spark Plug


Exhaust Muffler


Clutch Case


Rear Grip




Control Lever


Control Cable






Head Case


Nylon Cutting Head


Fuel Filler Cap


Starter Knob


Exhaust Pipe





CAUTION: Before doing any work on the string trimmer, always switch off the engine and pull the spark plug connector off the spark plug. Always wear protective gloves.

CAUTION: Start the string trimmer only after having assembled it completely.

For machine with Loop handle

Attach the handle to the shaft.

After the loop handle (1) is in place, tighten the three screws (2). Be sure the bolts are tight, but do not over tighten.

Adjust the handle to the desired position over 200mm away from the rear grip (3) and tighten the three screws (2).


To meet the applicable safety provisions, only the tool/protector combinations as indicated in the table must be used.

Be sure to use genuine DOLMAR nylon cutting head.

Nylon cutting head

Protector for nylon

– If the nylon cutting head hits against a stone during operation, stop the


cutting hesd

engine and check the nylon cutting head immediately.




PART NO. 6168020000 PART NO. 6168016001-1

Attach the protector (6) to the shaft.

Insert the nut M6 (5) into the hex hole in the protector (6).

Secure the protector with the installation bolt M6 x 45 (4).


Do not tighten the installation bolt M6 x 45 (4) excessivley.


Turn the machine upside down, and you can replace the nylon cutting head.

Insert the hex wrench provided through the hole in the head case and rotate the support washer until it is locked with the hex wrench (or the shaft is locked).

Screw the nylon cutting head onto the shaft.





Handling fuel

Utmost care is required when handling fuel. Fuel may contain substances similar to solvents. Refuel either in a well-ventilated room or outdoors. Do not inhale fuel vapors; avoid any contact of fuel or oil with your skin.

Mineral oil products degrease your skin. If your skin comes in contact with these substances repeatedly and for an extended period of time, it will desiccate. Various skin diseases may result. In addition, allergic reactions mey occur. Eyes can be irritated by contact with oil. If oil comes into your eyes, immediately wash them with clear water. If your eyes are still irritated, see a doctor immediately!

Fuel and oil mixture

The engine of the String trimmer is a high-efficiency two-stroke engine. It is run with a mixture of fuel and two-stroke engine oil. The engine is designed for unleaded regular fuel with a min. octane value of 91 RON. In case no such fuel is available, you can use fuel with a higher octane value. This will not affect the engine, but may cause poor operating behaviour.

A similar situation will arise from the use of leaded fuel. To obtain optimum engine operation and to protect your health and the environment, only unleaded fuel should be used!

For lubricating the engine use a two-stroke engine oil (quality grade: TC-3), which is added to the fuel. The engine has been designed to use specified two-stroke engine oil at mixture ratio of 50:1 to protect the environment. In addition, a long service life and a reliable operation with a minimum emission of exhaust gases is guaranteed. It is absolutely essential to observe a mixture ratio of 50:1 (specified 2-stroke engine oil), as otherwise reliable function of the String trimmer cannot be guaranteed.

The correct mixture ratio:

Gasoline : Specified two-stroke engine oil = 50 : 1 or Gasoline : Other manufacturer’s two-stroke engine oil = 25 : 1


NOTE: For preparing the fuel-oil mixture first mix the entire oil quantity with half of the fuel required, then add the remaining fuel. Thoroughly shake the mixture before filling it into the String trimmer tank. It is not wise to add more engine oil than specified to ensure safe operation.

This will only result in a higher production of combustion residues which will pollute the environment and clog the exhaust channel in the cylinder as well as the muffler. In addition, the fuel consumption will rise and the performance will decrease.


The engine must be switched off!

Thoroughly clean the area around the fuel filler cap (2), to prevent dirt from getting into the fuel tank (1).

Unscrew the fuel filler cap (2) and fill the tank with fuel.

Tightly screw on the fuel filler cap (2).

Clean screw fuel filler cap (2) and tank after refueling!

Storage of Fuel

Fuel cannot be stored for an unlimited period of time.

Purchase only the quantity required for a 4 week operating period. Only use approved fuel storage containers.

Observe the Safety Instructions on page 4.














1000 mL

(1 L)

20 mL

40 mL


5000 mL

(5 L)

100 mL

200 mL

10000 mL (10 L)

200 mL

400 mL





















Observe the applicable accident prevention regulations!


Move at least 3m away from the place of refuelling. Place the String trimmer on a clean piece of ground taking care that the cutting tool does not come into contact with the ground or any other objects.

Cold start

For machine with Loop Handle

– Push the I-O switch (1) in the direction shown by the arrow.

First place the machine on the ground.

Give a gentle push on the primer pump (1) repeatedly (7-10 times) until lfuel comes into the primer pump.

Push the choke button (2) to the position “

Firmly hold the clutch case by your left hand, as illustrated.

Slowly pull the starter grip until resistance is felt and continue with a smart pull.

Do not pull out the starter rope to its full extent and do not allow the starter handle to be retracted without control, but ensure that it is retracted slowly.

Repeat the starting operation until initial ignitions are heard.

When the engine starts, please open the throttle lever a little. The choke button being automatic, it returns to original position “ ”.

Run the engine for approximately one minute at a moderate speed before applying full throttle.

Note: − If the starter handle is pulled repeatedly when the choke button remains at “

” position, the engine will not start easily due to excessive

fuel intake.


In case of excessive fuel intake, remove the spark plug and pull the starter handle slowly to remove excess fuel. Also, dry the electrode section of the spark plug.

Caution during operation:

If the throttle lever is opened fully in a no-load operation, the engine rotation is increased to 10,000 /min or more. Never operate the engine at a higher speed than required and at an approximate speed of 6,000 - 8,000 /min.

Starting the warm engine

– As described above, except without moving the choke buttun.



Release the throttle lever fully, and when the engine rpm has lowered, push the I-O switch (1) to “O” position the engine will now stop.

Be aware that the cutting head may not stop immediately and allow it to slow down fully.


The nylon cutting head should not run when the control lever is fully released. screw.

Checking the Idling speed

Idle speed should be set to 3,000 / min.

If necessary correct it by means of the idle screw (the nylon cutting head must not turn when the engine is on idle).

Screwing in the screw (1) will cause an increase in the engine speed, whereas backing off the screw will reduce the engine speed.

If necessary, adjust the idle rpm using the idle adjusting


Slow High


The nylon cutting head is a dual string trimmer head capable of both automatic and bump & feed mechanisms.

The nylon cutting head will automatically feed out the proper length of nylon cord by the changes in centrifugal force caused by increasing or decreasing RPMS. However, to cut soft grass more efficiently, bump the nylon cutting head against the ground to feed out extra cord as indicated under operation section.


Increase the nylon cutting head speed to approx. 6,000 / min.

Low speed (under 4,800 / min) is not suitable, the nylon cord will not feed out properly at low speed.

The most effective cutting area is shown by the shaded area.

If the nylon cord does not feed out automatically proceed as follows:

1.Release the control lever to run the engine idle and then squeeze the control lever fully. Repeat this procedure until the nylon cord feeds out to the proper length.

2.If the nylon cord is too short to feed out automatically with the above procedure, bump the knob of the nylon cutting head against the ground to feed out the nylon cord.

3.If the nylon cord does not feed out with procedure 2, rewind/replace the nylon cord by following the procedures described under “Replacing the nylon cord”.

Most effective cutting area

Idle speed

Full speed



Replacing the nylon cord

First, stop the engine.

Press on the housing latches inward to lift off the cover, then remove the spool.

Hook the center of new nylon cord into the notch in the center of the spool, with one end of the cord extending about 80mm (3-1/8") more than the other. Then wind both ends firmly around the spool in the direction of the head rotation (left-hand direction indicated by LH and right-hand direction by RH on the side of the spool).

Wind all but about 100mm (3-15/16") of the cords, leaving the ends temporarily hooked through a notch on the side of the spool.

Mount the spool in the housing so that the grooves and protrusions on the spool match up with those in the housing. Keep the side with letters on the spool visible on the top. Now, unhook the ends of the cord from their temporary position and feed the cords through the eyelets to come out of the housing.

Align the protrusion on the underside of the cover with the slots of the eyelets.

Then push cover firmly onto the housing to secure it.








For left hand rotation






Slot of eyelet



CAUTION: Before doing any work on the string trimmer, always switch off the engine and pull the plug cap off the spark plug (see “checking the spark plug”).

Always wear protective gloves!

To ensure a long service life and to avoid any damage to the equipment, the following servicing operations should be performed at regular intervals.

Daily checkup and maintenance

Before operation, check the machine for loose screws or missing parts. Pay particular attention to the tightness of the nylon cutting head.

Before operation, always check for clogging of the cooling air passage and the cylinder fins. Clean them if necessary.

Perform the following work daily after use:

Clean the string trimmer externally and inspect for damage.

Clean the air filter. When working under extremely dusty conditions, clean the filter the several times a day.

Check the nylon cutting head for damage and make sure it is firmly mounted.

Check that there is sufficient difference between idling and engagement speed to ensure that the nylon cutting head is at a standstill while the engine is idling (if necessary, reduce idling speed).

If under idling conditions the tool should still continue to run, consult your nearest Authorized Service Agent.

Check the functioning of the I-O switch, the lock-off lever, the control lever.

Cleaning of air cleaner

Clogging of the element (1) may sometimes make it difficult or impossible to start up the engine or increase the engine speed.

After the end of operation, be sure to clean the air cleaner as mentioned below.

Remove the air cleaner cover screw.

Place the finger under the air cleaner cover, push down the cover lower part, and detach the air cleaner cover.

Take out the element (1), clean it with lukewarm water mixed with neutral detergent, and dry it completely.

After cleaning, attach the element.

Insert the claw at the case upper part into the hole at the upper part of the air cleaner cover. Then, attach the air cleaner cover by pushing it, and tighten the screw (2).

NOTE:If there is excessive dust or dirt adhering to the air cleaner, clean it every day. A clogged air cleaner may make it difficult or impossible to start the engine or increase the engine rotational speed.

Checking the spark plug

Only use the supplied universal wrench to remove or to install the spark plug.

The gap between the two electrodes of the spark plug should be 0.6 - 0.7 mm (0.024" - 0.028"). If the gap is too wide or too narrow, adjust it. If the spark plug is clogged with carbon or fouled, clean it thoroughly or replace it.

CAUTION: Never touch the spark plug connector while the engine is running (danger of high voltage electric shock).



0.6mm-0.7mm (0.024”-0.028”)


Suction head in the fuel tank

The felt filler (1) of the suction head is used to filler the fuel required by the carburetor.

A periodical visual inspection of the felt filter is to be conducted. For that purpose open the tank cap, use a wire hook and pull out the suction head through the tank opening. Filters found to have hardened, been polluted or clogged up are to be replaced.

Insufficient fuel supply can result in the admissible maximum speed being exceeded. It is therefore important to replace the felt filter at least quarterly to ensure satisfactory fuel supply to the carburetor.

Cleaning of muffler exhaust port

Check of muffler exhaust port (2) regularly.

If it is clogged by carbon deposits, carefully scratch the deposits out with a suitable tool.



Any maintenance of adjustment work that is not included and described in this manual is only to be performed by Authorized Service Agents.



– When the machine is in storage for a long time, drain fuel from the fuel tank



and carburetor, as follows: Drain all fuel from the fuel tank. Dispose of



properly and in accordance with all local laws.



– Remove the spark plug and a few drops of oil into the spark plug hole.



Then, pull the starter gently, so that oil covers the engine inside and tighten



the spark plug.

Drain fuel


– Clear dirt or dust from the nylon cutting head and outside of engine, wipe



them with a oil-immersed cloth and keep the machine in a place as dry as






Maintenance schedule


Engine assembly, screws and

Visual inspection for damage and tightness



Check for general condition and security




After each refuelling

Control lever

Functional check



Functional check





Air filter

To be cleaned


Cooling air duct

To be cleaned


Cutting tool

Check for damage and sharpness


Idling speed

Inspection (cutting tool must not move)





Spark plug

Inspection, replace if necessary



Check and if necessary clean the opening





Suction head

To be replaced


Fuel tank

To be cleaned




Shuting down procedure

Fuel tank

Empty fuel tank



Operate until engine runs out of fuel




Fault location









Engine not starting or with

Ignition system

Ignition spark O.K.

Fault in fuel supply or compression system, mechanical







No ignition spark

I-O switch operated, wiring fault or short circuit, spark




plug or connector defective, ignition module faulty


Fuel supply

Fuel tank filled

Incorrect choke position, carburetor defective, fuel supply




line bent or blocked, fuel dirty.



No compression when

Cylinder bottom gasket defective, crankshaft seals



pulled over

damaged, cylinder or piston rings defective or improper




sealing of spark plug


Mechanical fault

Starter not engaging

Broken starter spring, broken parts inside of the engine

Warm start problems


Tank filled ignition spark

Carburetor contaminated, must be cleaned





Engine starts but dies

Fuel supply

Tank filled

Incorrect idling adjustment, carburetor contaminated




Fuel tank vent defective, fuel supply line interrupted,




cable or I-O switch faulty

Insufficient performance

Several systems

Engine idling poor

Air filter contaminated, carburetor contaminated, muffler


may simultaneously


clogged, exhaust duct in the cylinder clogged


be affected








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